3 perldiag - various Perl diagnostics
7 These messages are classified as follows (listed in increasing order of
10 (W) A warning (optional).
11 (D) A deprecation (optional).
12 (S) A severe warning (default).
13 (F) A fatal error (trappable).
14 (P) An internal error you should never see (trappable).
15 (X) A very fatal error (nontrappable).
16 (A) An alien error message (not generated by Perl).
18 The majority of messages from the first three classifications above
19 (W, D & S) can be controlled using the C<warnings> pragma.
21 If a message can be controlled by the C<warnings> pragma, its warning
22 category is included with the classification letter in the description
25 Optional warnings are enabled by using the C<warnings> pragma or the B<-w>
26 and B<-W> switches. Warnings may be captured by setting C<$SIG{__WARN__}>
27 to a reference to a routine that will be called on each warning instead
28 of printing it. See L<perlvar>.
30 Default warnings are always enabled unless they are explicitly disabled
31 with the C<warnings> pragma or the B<-X> switch.
33 Trappable errors may be trapped using the eval operator. See
34 L<perlfunc/eval>. In almost all cases, warnings may be selectively
35 disabled or promoted to fatal errors using the C<warnings> pragma.
38 The messages are in alphabetical order, without regard to upper or
39 lower-case. Some of these messages are generic. Spots that vary are
40 denoted with a %s or other printf-style escape. These escapes are
41 ignored by the alphabetical order, as are all characters other than
42 letters. To look up your message, just ignore anything that is not a
47 =item accept() on closed socket %s
49 (W closed) You tried to do an accept on a closed socket. Did you forget
50 to check the return value of your socket() call? See
53 =item Allocation too large: %lx
55 (X) You can't allocate more than 64K on an MS-DOS machine.
57 =item '%c' allowed only after types %s
59 (F) The modifiers '!', '<' and '>' are allowed in pack() or unpack() only
60 after certain types. See L<perlfunc/pack>.
62 =item Ambiguous call resolved as CORE::%s(), qualify as such or use &
64 (W ambiguous) A subroutine you have declared has the same name as a Perl
65 keyword, and you have used the name without qualification for calling
66 one or the other. Perl decided to call the builtin because the
67 subroutine is not imported.
69 To force interpretation as a subroutine call, either put an ampersand
70 before the subroutine name, or qualify the name with its package.
71 Alternatively, you can import the subroutine (or pretend that it's
72 imported with the C<use subs> pragma).
74 To silently interpret it as the Perl operator, use the C<CORE::> prefix
75 on the operator (e.g. C<CORE::log($x)>) or declare the subroutine
76 to be an object method (see L<perlsub/"Subroutine Attributes"> or
79 =item Ambiguous range in transliteration operator
81 (F) You wrote something like C<tr/a-z-0//> which doesn't mean anything at
82 all. To include a C<-> character in a transliteration, put it either
83 first or last. (In the past, C<tr/a-z-0//> was synonymous with
84 C<tr/a-y//>, which was probably not what you would have expected.)
86 =item Ambiguous use of %s resolved as %s
88 (W ambiguous)(S) You said something that may not be interpreted the way
89 you thought. Normally it's pretty easy to disambiguate it by supplying
90 a missing quote, operator, parenthesis pair or declaration.
92 =item '|' and '<' may not both be specified on command line
94 (F) An error peculiar to VMS. Perl does its own command line
95 redirection, and found that STDIN was a pipe, and that you also tried to
96 redirect STDIN using '<'. Only one STDIN stream to a customer, please.
98 =item '|' and '>' may not both be specified on command line
100 (F) An error peculiar to VMS. Perl does its own command line
101 redirection, and thinks you tried to redirect stdout both to a file and
102 into a pipe to another command. You need to choose one or the other,
103 though nothing's stopping you from piping into a program or Perl script
104 which 'splits' output into two streams, such as
106 open(OUT,">$ARGV[0]") or die "Can't write to $ARGV[0]: $!";
113 =item Applying %s to %s will act on scalar(%s)
115 (W misc) The pattern match (C<//>), substitution (C<s///>), and
116 transliteration (C<tr///>) operators work on scalar values. If you apply
117 one of them to an array or a hash, it will convert the array or hash to
118 a scalar value -- the length of an array, or the population info of a
119 hash -- and then work on that scalar value. This is probably not what
120 you meant to do. See L<perlfunc/grep> and L<perlfunc/map> for
123 =item Args must match #! line
125 (F) The setuid emulator requires that the arguments Perl was invoked
126 with match the arguments specified on the #! line. Since some systems
127 impose a one-argument limit on the #! line, try combining switches;
128 for example, turn C<-w -U> into C<-wU>.
130 =item Arg too short for msgsnd
132 (F) msgsnd() requires a string at least as long as sizeof(long).
134 =item %s argument is not a HASH or ARRAY element
136 (F) The argument to exists() must be a hash or array element, such as:
141 =item %s argument is not a HASH or ARRAY element or slice
143 (F) The argument to delete() must be either a hash or array element,
149 or a hash or array slice, such as:
151 @foo[$bar, $baz, $xyzzy]
152 @{$ref->[12]}{"susie", "queue"}
154 =item %s argument is not a subroutine name
156 (F) The argument to exists() for C<exists &sub> must be a subroutine
157 name, and not a subroutine call. C<exists &sub()> will generate this
160 =item Argument "%s" isn't numeric%s
162 (W numeric) The indicated string was fed as an argument to an operator
163 that expected a numeric value instead. If you're fortunate the message
164 will identify which operator was so unfortunate.
166 =item Argument list not closed for PerlIO layer "%s"
168 (W layer) When pushing a layer with arguments onto the Perl I/O system you
169 forgot the ) that closes the argument list. (Layers take care of transforming
170 data between external and internal representations.) Perl stopped parsing
171 the layer list at this point and did not attempt to push this layer.
172 If your program didn't explicitly request the failing operation, it may be
173 the result of the value of the environment variable PERLIO.
175 =item Array @%s missing the @ in argument %d of %s()
177 (D deprecated) Really old Perl let you omit the @ on array names in some
178 spots. This is now heavily deprecated.
180 =item assertion botched: %s
182 (P) The malloc package that comes with Perl had an internal failure.
184 =item Assertion failed: file "%s"
186 (P) A general assertion failed. The file in question must be examined.
188 =item Assignment to both a list and a scalar
190 (F) If you assign to a conditional operator, the 2nd and 3rd arguments
191 must either both be scalars or both be lists. Otherwise Perl won't
192 know which context to supply to the right side.
194 =item A thread exited while %d threads were running
196 (W) When using threaded Perl, a thread (not necessarily the main
197 thread) exited while there were still other threads running.
198 Usually it's a good idea to first collect the return values of the
199 created threads by joining them, and only then exit from the main
200 thread. See L<threads>.
202 =item Attempt to access disallowed key '%s' in a restricted hash
204 (F) The failing code has attempted to get or set a key which is not in
205 the current set of allowed keys of a restricted hash.
207 =item Attempt to bless into a reference
209 (F) The CLASSNAME argument to the bless() operator is expected to be
210 the name of the package to bless the resulting object into. You've
211 supplied instead a reference to something: perhaps you wrote
217 bless $self, ref($proto) || $proto;
219 If you actually want to bless into the stringified version
220 of the reference supplied, you need to stringify it yourself, for
223 bless $self, "$proto";
225 =item Attempt to delete disallowed key '%s' from a restricted hash
227 (F) The failing code attempted to delete from a restricted hash a key
228 which is not in its key set.
230 =item Attempt to delete readonly key '%s' from a restricted hash
232 (F) The failing code attempted to delete a key whose value has been
233 declared readonly from a restricted hash.
235 =item Attempt to free non-arena SV: 0x%lx
237 (P internal) All SV objects are supposed to be allocated from arenas
238 that will be garbage collected on exit. An SV was discovered to be
239 outside any of those arenas.
241 =item Attempt to free nonexistent shared string
243 (P internal) Perl maintains a reference counted internal table of
244 strings to optimize the storage and access of hash keys and other
245 strings. This indicates someone tried to decrement the reference count
246 of a string that can no longer be found in the table.
248 =item Attempt to free temp prematurely
250 (W debugging) Mortalized values are supposed to be freed by the
251 free_tmps() routine. This indicates that something else is freeing the
252 SV before the free_tmps() routine gets a chance, which means that the
253 free_tmps() routine will be freeing an unreferenced scalar when it does
256 =item Attempt to free unreferenced glob pointers
258 (P internal) The reference counts got screwed up on symbol aliases.
260 =item Attempt to free unreferenced scalar
262 (W internal) Perl went to decrement the reference count of a scalar to
263 see if it would go to 0, and discovered that it had already gone to 0
264 earlier, and should have been freed, and in fact, probably was freed.
265 This could indicate that SvREFCNT_dec() was called too many times, or
266 that SvREFCNT_inc() was called too few times, or that the SV was
267 mortalized when it shouldn't have been, or that memory has been
270 =item Attempt to join self
272 (F) You tried to join a thread from within itself, which is an
273 impossible task. You may be joining the wrong thread, or you may need
274 to move the join() to some other thread.
276 =item Attempt to pack pointer to temporary value
278 (W pack) You tried to pass a temporary value (like the result of a
279 function, or a computed expression) to the "p" pack() template. This
280 means the result contains a pointer to a location that could become
281 invalid anytime, even before the end of the current statement. Use
282 literals or global values as arguments to the "p" pack() template to
285 =item Attempt to set length of freed array
287 (W) You tried to set the length of an array which has been freed. You
288 can do this by storing a reference to the scalar representing the last index
289 of an array and later assigning through that reference. For example
291 $r = do {my @a; \$#a};
294 =item Attempt to use reference as lvalue in substr
296 (W substr) You supplied a reference as the first argument to substr()
297 used as an lvalue, which is pretty strange. Perhaps you forgot to
298 dereference it first. See L<perlfunc/substr>.
300 =item Bad arg length for %s, is %d, should be %s
302 (F) You passed a buffer of the wrong size to one of msgctl(), semctl()
303 or shmctl(). In C parlance, the correct sizes are, respectively,
304 S<sizeof(struct msqid_ds *)>, S<sizeof(struct semid_ds *)>, and
305 S<sizeof(struct shmid_ds *)>.
307 =item Bad evalled substitution pattern
309 (F) You've used the C</e> switch to evaluate the replacement for a
310 substitution, but perl found a syntax error in the code to evaluate,
311 most likely an unexpected right brace '}'.
313 =item Bad filehandle: %s
315 (F) A symbol was passed to something wanting a filehandle, but the
316 symbol has no filehandle associated with it. Perhaps you didn't do an
317 open(), or did it in another package.
319 =item Bad free() ignored
321 (S malloc) An internal routine called free() on something that had never
322 been malloc()ed in the first place. Mandatory, but can be disabled by
323 setting environment variable C<PERL_BADFREE> to 0.
325 This message can be seen quite often with DB_File on systems with "hard"
326 dynamic linking, like C<AIX> and C<OS/2>. It is a bug of C<Berkeley DB>
327 which is left unnoticed if C<DB> uses I<forgiving> system malloc().
331 (P) One of the internal hash routines was passed a null HV pointer.
333 =item Badly placed ()'s
335 (A) You've accidentally run your script through B<csh> instead
336 of Perl. Check the #! line, or manually feed your script into
339 =item Bad name after %s::
341 (F) You started to name a symbol by using a package prefix, and then
342 didn't finish the symbol. In particular, you can't interpolate outside
351 $sym = "mypack::$var";
353 =item Bad realloc() ignored
355 (S malloc) An internal routine called realloc() on something that had
356 never been malloc()ed in the first place. Mandatory, but can be disabled
357 by setting environment variable C<PERL_BADFREE> to 1.
359 =item Bad symbol for array
361 (P) An internal request asked to add an array entry to something that
362 wasn't a symbol table entry.
364 =item Bad symbol for filehandle
366 (P) An internal request asked to add a filehandle entry to something
367 that wasn't a symbol table entry.
369 =item Bad symbol for hash
371 (P) An internal request asked to add a hash entry to something that
372 wasn't a symbol table entry.
374 =item Bareword found in conditional
376 (W bareword) The compiler found a bareword where it expected a
377 conditional, which often indicates that an || or && was parsed as part
378 of the last argument of the previous construct, for example:
382 It may also indicate a misspelled constant that has been interpreted as
385 use constant TYPO => 1;
386 if (TYOP) { print "foo" }
388 The C<strict> pragma is useful in avoiding such errors.
390 =item Bareword "%s" not allowed while "strict subs" in use
392 (F) With "strict subs" in use, a bareword is only allowed as a
393 subroutine identifier, in curly brackets or to the left of the "=>"
394 symbol. Perhaps you need to predeclare a subroutine?
396 =item Bareword "%s" refers to nonexistent package
398 (W bareword) You used a qualified bareword of the form C<Foo::>, but the
399 compiler saw no other uses of that namespace before that point. Perhaps
400 you need to predeclare a package?
402 =item BEGIN failed--compilation aborted
404 (F) An untrapped exception was raised while executing a BEGIN
405 subroutine. Compilation stops immediately and the interpreter is
408 =item BEGIN not safe after errors--compilation aborted
410 (F) Perl found a C<BEGIN {}> subroutine (or a C<use> directive, which
411 implies a C<BEGIN {}>) after one or more compilation errors had already
412 occurred. Since the intended environment for the C<BEGIN {}> could not
413 be guaranteed (due to the errors), and since subsequent code likely
414 depends on its correct operation, Perl just gave up.
416 =item \1 better written as $1
418 (W syntax) Outside of patterns, backreferences live on as variables.
419 The use of backslashes is grandfathered on the right-hand side of a
420 substitution, but stylistically it's better to use the variable form
421 because other Perl programmers will expect it, and it works better if
422 there are more than 9 backreferences.
424 =item Binary number > 0b11111111111111111111111111111111 non-portable
426 (W portable) The binary number you specified is larger than 2**32-1
427 (4294967295) and therefore non-portable between systems. See
428 L<perlport> for more on portability concerns.
430 =item bind() on closed socket %s
432 (W closed) You tried to do a bind on a closed socket. Did you forget to
433 check the return value of your socket() call? See L<perlfunc/bind>.
435 =item binmode() on closed filehandle %s
437 (W unopened) You tried binmode() on a filehandle that was never opened.
438 Check you control flow and number of arguments.
440 =item Bit vector size > 32 non-portable
442 (W portable) Using bit vector sizes larger than 32 is non-portable.
444 =item Bizarre copy of %s in %s
446 (P) Perl detected an attempt to copy an internal value that is not
449 =item Buffer overflow in prime_env_iter: %s
451 (W internal) A warning peculiar to VMS. While Perl was preparing to
452 iterate over %ENV, it encountered a logical name or symbol definition
453 which was too long, so it was truncated to the string shown.
455 =item Callback called exit
457 (F) A subroutine invoked from an external package via call_sv()
458 exited by calling exit.
460 =item %s() called too early to check prototype
462 (W prototype) You've called a function that has a prototype before the
463 parser saw a definition or declaration for it, and Perl could not check
464 that the call conforms to the prototype. You need to either add an
465 early prototype declaration for the subroutine in question, or move the
466 subroutine definition ahead of the call to get proper prototype
467 checking. Alternatively, if you are certain that you're calling the
468 function correctly, you may put an ampersand before the name to avoid
469 the warning. See L<perlsub>.
471 =item Cannot compress integer in pack
473 (F) An argument to pack("w",...) was too large to compress. The BER
474 compressed integer format can only be used with positive integers, and you
475 attempted to compress Infinity or a very large number (> 1e308).
476 See L<perlfunc/pack>.
478 =item Cannot compress negative numbers in pack
480 (F) An argument to pack("w",...) was negative. The BER compressed integer
481 format can only be used with positive integers. See L<perlfunc/pack>.
483 =item Can only compress unsigned integers in pack
485 (F) An argument to pack("w",...) was not an integer. The BER compressed
486 integer format can only be used with positive integers, and you attempted
487 to compress something else. See L<perlfunc/pack>.
489 =item Can't bless non-reference value
491 (F) Only hard references may be blessed. This is how Perl "enforces"
492 encapsulation of objects. See L<perlobj>.
494 =item Can't call method "%s" in empty package "%s"
496 (F) You called a method correctly, and it correctly indicated a package
497 functioning as a class, but that package doesn't have ANYTHING defined
498 in it, let alone methods. See L<perlobj>.
500 =item Can't call method "%s" on an undefined value
502 (F) You used the syntax of a method call, but the slot filled by the
503 object reference or package name contains an undefined value. Something
504 like this will reproduce the error:
507 process $BADREF 1,2,3;
508 $BADREF->process(1,2,3);
510 =item Can't call method "%s" on unblessed reference
512 (F) A method call must know in what package it's supposed to run. It
513 ordinarily finds this out from the object reference you supply, but you
514 didn't supply an object reference in this case. A reference isn't an
515 object reference until it has been blessed. See L<perlobj>.
517 =item Can't call method "%s" without a package or object reference
519 (F) You used the syntax of a method call, but the slot filled by the
520 object reference or package name contains an expression that returns a
521 defined value which is neither an object reference nor a package name.
522 Something like this will reproduce the error:
525 process $BADREF 1,2,3;
526 $BADREF->process(1,2,3);
528 =item Can't chdir to %s
530 (F) You called C<perl -x/foo/bar>, but C</foo/bar> is not a directory
531 that you can chdir to, possibly because it doesn't exist.
533 =item Can't check filesystem of script "%s" for nosuid
535 (P) For some reason you can't check the filesystem of the script for
538 =item Can't coerce array into hash
540 (F) You used an array where a hash was expected, but the array has no
541 information on how to map from keys to array indices. You can do that
542 only with arrays that have a hash reference at index 0.
544 =item Can't coerce %s to integer in %s
546 (F) Certain types of SVs, in particular real symbol table entries
547 (typeglobs), can't be forced to stop being what they are. So you can't
557 but then $foo no longer contains a glob.
559 =item Can't coerce %s to number in %s
561 (F) Certain types of SVs, in particular real symbol table entries
562 (typeglobs), can't be forced to stop being what they are.
564 =item Can't coerce %s to string in %s
566 (F) Certain types of SVs, in particular real symbol table entries
567 (typeglobs), can't be forced to stop being what they are.
569 =item Can't create pipe mailbox
571 (P) An error peculiar to VMS. The process is suffering from exhausted
572 quotas or other plumbing problems.
574 =item Can't declare class for non-scalar %s in "%s"
576 (F) Currently, only scalar variables can be declared with a specific
577 class qualifier in a "my" or "our" declaration. The semantics may be
578 extended for other types of variables in future.
580 =item Can't declare %s in "%s"
582 (F) Only scalar, array, and hash variables may be declared as "my" or
583 "our" variables. They must have ordinary identifiers as names.
585 =item Can't do inplace edit: %s is not a regular file
587 (S inplace) You tried to use the B<-i> switch on a special file, such as
588 a file in /dev, or a FIFO. The file was ignored.
590 =item Can't do inplace edit on %s: %s
592 (S inplace) The creation of the new file failed for the indicated
595 =item Can't do inplace edit without backup
597 (F) You're on a system such as MS-DOS that gets confused if you try
598 reading from a deleted (but still opened) file. You have to say
599 C<-i.bak>, or some such.
601 =item Can't do inplace edit: %s would not be unique
603 (S inplace) Your filesystem does not support filenames longer than 14
604 characters and Perl was unable to create a unique filename during
605 inplace editing with the B<-i> switch. The file was ignored.
607 =item Can't do {n,m} with n > m in regex; marked by <-- HERE in m/%s/
609 (F) Minima must be less than or equal to maxima. If you really want your
610 regexp to match something 0 times, just put {0}. The <-- HERE shows in the
611 regular expression about where the problem was discovered. See L<perlre>.
613 =item Can't do setegid!
615 (P) The setegid() call failed for some reason in the setuid emulator of
618 =item Can't do seteuid!
620 (P) The setuid emulator of suidperl failed for some reason.
622 =item Can't do setuid
624 (F) This typically means that ordinary perl tried to exec suidperl to do
625 setuid emulation, but couldn't exec it. It looks for a name of the form
626 sperl5.000 in the same directory that the perl executable resides under
627 the name perl5.000, typically /usr/local/bin on Unix machines. If the
628 file is there, check the execute permissions. If it isn't, ask your
629 sysadmin why he and/or she removed it.
631 =item Can't do waitpid with flags
633 (F) This machine doesn't have either waitpid() or wait4(), so only
634 waitpid() without flags is emulated.
636 =item Can't emulate -%s on #! line
638 (F) The #! line specifies a switch that doesn't make sense at this
639 point. For example, it'd be kind of silly to put a B<-x> on the #!
642 =item Can't %s %s-endian %ss on this platform
644 (F) Your platform's byte-order is neither big-endian nor little-endian,
645 or it has a very strange pointer size. Packing and unpacking big- or
646 little-endian floating point values and pointers may not be possible.
647 See L<perlfunc/pack>.
649 =item Can't exec "%s": %s
651 (W exec) A system(), exec(), or piped open call could not execute the
652 named program for the indicated reason. Typical reasons include: the
653 permissions were wrong on the file, the file wasn't found in
654 C<$ENV{PATH}>, the executable in question was compiled for another
655 architecture, or the #! line in a script points to an interpreter that
656 can't be run for similar reasons. (Or maybe your system doesn't support
661 (F) Perl was trying to execute the indicated program for you because
662 that's what the #! line said. If that's not what you wanted, you may
663 need to mention "perl" on the #! line somewhere.
665 =item Can't execute %s
667 (F) You used the B<-S> switch, but the copies of the script to execute
668 found in the PATH did not have correct permissions.
670 =item Can't find an opnumber for "%s"
672 (F) A string of a form C<CORE::word> was given to prototype(), but there
673 is no builtin with the name C<word>.
675 =item Can't find %s character property "%s"
677 (F) You used C<\p{}> or C<\P{}> but the character property by that name
678 could not be found. Maybe you misspelled the name of the property
679 (remember that the names of character properties consist only of
680 alphanumeric characters), or maybe you forgot the C<Is> or C<In> prefix?
682 =item Can't find label %s
684 (F) You said to goto a label that isn't mentioned anywhere that it's
685 possible for us to go to. See L<perlfunc/goto>.
687 =item Can't find %s on PATH
689 (F) You used the B<-S> switch, but the script to execute could not be
692 =item Can't find %s on PATH, '.' not in PATH
694 (F) You used the B<-S> switch, but the script to execute could not be
695 found in the PATH, or at least not with the correct permissions. The
696 script exists in the current directory, but PATH prohibits running it.
698 =item Can't find %s property definition %s
700 (F) You may have tried to use C<\p> which means a Unicode property (for
701 example C<\p{Lu}> is all uppercase letters). If you did mean to use a
702 Unicode property, see L<perlunicode> for the list of known properties.
703 If you didn't mean to use a Unicode property, escape the C<\p>, either
704 by C<\\p> (just the C<\p>) or by C<\Q\p> (the rest of the string, until
707 =item Can't find string terminator %s anywhere before EOF
709 (F) Perl strings can stretch over multiple lines. This message means
710 that the closing delimiter was omitted. Because bracketed quotes count
711 nesting levels, the following is missing its final parenthesis:
713 print q(The character '(' starts a side comment.);
715 If you're getting this error from a here-document, you may have included
716 unseen whitespace before or after your closing tag. A good programmer's
717 editor will have a way to help you find these characters.
721 (F) A fatal error occurred while trying to fork while opening a
724 =item Can't get filespec - stale stat buffer?
726 (S) A warning peculiar to VMS. This arises because of the difference
727 between access checks under VMS and under the Unix model Perl assumes.
728 Under VMS, access checks are done by filename, rather than by bits in
729 the stat buffer, so that ACLs and other protections can be taken into
730 account. Unfortunately, Perl assumes that the stat buffer contains all
731 the necessary information, and passes it, instead of the filespec, to
732 the access checking routine. It will try to retrieve the filespec using
733 the device name and FID present in the stat buffer, but this works only
734 if you haven't made a subsequent call to the CRTL stat() routine,
735 because the device name is overwritten with each call. If this warning
736 appears, the name lookup failed, and the access checking routine gave up
737 and returned FALSE, just to be conservative. (Note: The access checking
738 routine knows about the Perl C<stat> operator and file tests, so you
739 shouldn't ever see this warning in response to a Perl command; it arises
740 only if some internal code takes stat buffers lightly.)
742 =item Can't get pipe mailbox device name
744 (P) An error peculiar to VMS. After creating a mailbox to act as a
745 pipe, Perl can't retrieve its name for later use.
747 =item Can't get SYSGEN parameter value for MAXBUF
749 (P) An error peculiar to VMS. Perl asked $GETSYI how big you want your
750 mailbox buffers to be, and didn't get an answer.
752 =item Can't "goto" into the middle of a foreach loop
754 (F) A "goto" statement was executed to jump into the middle of a foreach
755 loop. You can't get there from here. See L<perlfunc/goto>.
757 =item Can't "goto" out of a pseudo block
759 (F) A "goto" statement was executed to jump out of what might look like
760 a block, except that it isn't a proper block. This usually occurs if
761 you tried to jump out of a sort() block or subroutine, which is a no-no.
762 See L<perlfunc/goto>.
764 =item Can't goto subroutine from an eval-%s
766 (F) The "goto subroutine" call can't be used to jump out of an eval
769 =item Can't goto subroutine outside a subroutine
771 (F) The deeply magical "goto subroutine" call can only replace one
772 subroutine call for another. It can't manufacture one out of whole
773 cloth. In general you should be calling it out of only an AUTOLOAD
774 routine anyway. See L<perlfunc/goto>.
776 =item Can't ignore signal CHLD, forcing to default
778 (W signal) Perl has detected that it is being run with the SIGCHLD
779 signal (sometimes known as SIGCLD) disabled. Since disabling this
780 signal will interfere with proper determination of exit status of child
781 processes, Perl has reset the signal to its default value. This
782 situation typically indicates that the parent program under which Perl
783 may be running (e.g. cron) is being very careless.
785 =item Can't "last" outside a loop block
787 (F) A "last" statement was executed to break out of the current block,
788 except that there's this itty bitty problem called there isn't a current
789 block. Note that an "if" or "else" block doesn't count as a "loopish"
790 block, as doesn't a block given to sort(), map() or grep(). You can
791 usually double the curlies to get the same effect though, because the
792 inner curlies will be considered a block that loops once. See
795 =item Can't load '%s' for module %s
797 (F) The module you tried to load failed to load a dynamic extension. This
798 may either mean that you upgraded your version of perl to one that is
799 incompatible with your old dynamic extensions (which is known to happen
800 between major versions of perl), or (more likely) that your dynamic
801 extension was built against an older version of the library that is
802 installed on your system. You may need to rebuild your old dynamic
805 =item Can't localize lexical variable %s
807 (F) You used local on a variable name that was previously declared as a
808 lexical variable using "my". This is not allowed. If you want to
809 localize a package variable of the same name, qualify it with the
812 =item Can't localize through a reference
814 (F) You said something like C<local $$ref>, which Perl can't currently
815 handle, because when it goes to restore the old value of whatever $ref
816 pointed to after the scope of the local() is finished, it can't be sure
817 that $ref will still be a reference.
819 =item Can't locate %s
821 (F) You said to C<do> (or C<require>, or C<use>) a file that couldn't be
822 found. Perl looks for the file in all the locations mentioned in @INC,
823 unless the file name included the full path to the file. Perhaps you
824 need to set the PERL5LIB or PERL5OPT environment variable to say where
825 the extra library is, or maybe the script needs to add the library name
826 to @INC. Or maybe you just misspelled the name of the file. See
827 L<perlfunc/require> and L<lib>.
829 =item Can't locate auto/%s.al in @INC
831 (F) A function (or method) was called in a package which allows
832 autoload, but there is no function to autoload. Most probable causes
833 are a misprint in a function/method name or a failure to C<AutoSplit>
834 the file, say, by doing C<make install>.
836 =item Can't locate loadable object for module %s in @INC
838 (F) The module you loaded is trying to load an external library, like
839 for example, C<foo.so> or C<bar.dll>, but the L<DynaLoader> module was
840 unable to locate this library. See L<DynaLoader>.
842 =item Can't locate object method "%s" via package "%s"
844 (F) You called a method correctly, and it correctly indicated a package
845 functioning as a class, but that package doesn't define that particular
846 method, nor does any of its base classes. See L<perlobj>.
848 =item Can't locate package %s for @%s::ISA
850 (W syntax) The @ISA array contained the name of another package that
851 doesn't seem to exist.
853 =item Can't locate PerlIO%s
855 (F) You tried to use in open() a PerlIO layer that does not exist,
856 e.g. open(FH, ">:nosuchlayer", "somefile").
858 =item Can't make list assignment to \%ENV on this system
860 (F) List assignment to %ENV is not supported on some systems, notably
863 =item Can't modify %s in %s
865 (F) You aren't allowed to assign to the item indicated, or otherwise try
866 to change it, such as with an auto-increment.
868 =item Can't modify nonexistent substring
870 (P) The internal routine that does assignment to a substr() was handed
873 =item Can't modify non-lvalue subroutine call
875 (F) Subroutines meant to be used in lvalue context should be declared as
876 such, see L<perlsub/"Lvalue subroutines">.
878 =item Can't msgrcv to read-only var
880 (F) The target of a msgrcv must be modifiable to be used as a receive
883 =item Can't "next" outside a loop block
885 (F) A "next" statement was executed to reiterate the current block, but
886 there isn't a current block. Note that an "if" or "else" block doesn't
887 count as a "loopish" block, as doesn't a block given to sort(), map() or
888 grep(). You can usually double the curlies to get the same effect
889 though, because the inner curlies will be considered a block that loops
890 once. See L<perlfunc/next>.
892 =item Can't open %s: %s
894 (S inplace) The implicit opening of a file through use of the C<< <> >>
895 filehandle, either implicitly under the C<-n> or C<-p> command-line
896 switches, or explicitly, failed for the indicated reason. Usually this
897 is because you don't have read permission for a file which you named on
900 =item Can't open a reference
902 (W io) You tried to open a scalar reference for reading or writing,
903 using the 3-arg open() syntax :
907 but your version of perl is compiled without perlio, and this form of
908 open is not supported.
910 =item Can't open bidirectional pipe
912 (W pipe) You tried to say C<open(CMD, "|cmd|")>, which is not supported.
913 You can try any of several modules in the Perl library to do this, such
914 as IPC::Open2. Alternately, direct the pipe's output to a file using
915 ">", and then read it in under a different file handle.
917 =item Can't open error file %s as stderr
919 (F) An error peculiar to VMS. Perl does its own command line
920 redirection, and couldn't open the file specified after '2>' or '2>>' on
921 the command line for writing.
923 =item Can't open input file %s as stdin
925 (F) An error peculiar to VMS. Perl does its own command line
926 redirection, and couldn't open the file specified after '<' on the
927 command line for reading.
929 =item Can't open output file %s as stdout
931 (F) An error peculiar to VMS. Perl does its own command line
932 redirection, and couldn't open the file specified after '>' or '>>' on
933 the command line for writing.
935 =item Can't open output pipe (name: %s)
937 (P) An error peculiar to VMS. Perl does its own command line
938 redirection, and couldn't open the pipe into which to send data destined
941 =item Can't open perl script%s
943 (F) The script you specified can't be opened for the indicated reason.
945 If you're debugging a script that uses #!, and normally relies on the
946 shell's $PATH search, the -S option causes perl to do that search, so
947 you don't have to type the path or C<`which $scriptname`>.
949 =item Can't read CRTL environ
951 (S) A warning peculiar to VMS. Perl tried to read an element of %ENV
952 from the CRTL's internal environment array and discovered the array was
953 missing. You need to figure out where your CRTL misplaced its environ
954 or define F<PERL_ENV_TABLES> (see L<perlvms>) so that environ is not
957 =item Can't redefine active sort subroutine %s
959 (F) Perl optimizes the internal handling of sort subroutines and keeps
960 pointers into them. You tried to redefine one such sort subroutine when
961 it was currently active, which is not allowed. If you really want to do
962 this, you should write C<sort { &func } @x> instead of C<sort func @x>.
964 =item Can't "redo" outside a loop block
966 (F) A "redo" statement was executed to restart the current block, but
967 there isn't a current block. Note that an "if" or "else" block doesn't
968 count as a "loopish" block, as doesn't a block given to sort(), map()
969 or grep(). You can usually double the curlies to get the same effect
970 though, because the inner curlies will be considered a block that
971 loops once. See L<perlfunc/redo>.
973 =item Can't remove %s: %s, skipping file
975 (S inplace) You requested an inplace edit without creating a backup
976 file. Perl was unable to remove the original file to replace it with
977 the modified file. The file was left unmodified.
979 =item Can't rename %s to %s: %s, skipping file
981 (S inplace) The rename done by the B<-i> switch failed for some reason,
982 probably because you don't have write permission to the directory.
984 =item Can't reopen input pipe (name: %s) in binary mode
986 (P) An error peculiar to VMS. Perl thought stdin was a pipe, and tried
987 to reopen it to accept binary data. Alas, it failed.
989 =item Can't resolve method `%s' overloading `%s' in package `%s'
991 (F|P) Error resolving overloading specified by a method name (as opposed
992 to a subroutine reference): no such method callable via the package. If
993 method name is C<???>, this is an internal error.
995 =item Can't reswap uid and euid
997 (P) The setreuid() call failed for some reason in the setuid emulator of
1000 =item Can't return %s from lvalue subroutine
1002 (F) Perl detected an attempt to return illegal lvalues (such as
1003 temporary or readonly values) from a subroutine used as an lvalue. This
1006 =item Can't return outside a subroutine
1008 (F) The return statement was executed in mainline code, that is, where
1009 there was no subroutine call to return out of. See L<perlsub>.
1011 =item Can't return %s to lvalue scalar context
1013 (F) You tried to return a complete array or hash from an lvalue subroutine,
1014 but you called the subroutine in a way that made Perl think you meant
1015 to return only one value. You probably meant to write parentheses around
1016 the call to the subroutine, which tell Perl that the call should be in
1019 =item Can't stat script "%s"
1021 (P) For some reason you can't fstat() the script even though you have it
1022 open already. Bizarre.
1024 =item Can't swap uid and euid
1026 (P) The setreuid() call failed for some reason in the setuid emulator of
1029 =item Can't take log of %g
1031 (F) For ordinary real numbers, you can't take the logarithm of a
1032 negative number or zero. There's a Math::Complex package that comes
1033 standard with Perl, though, if you really want to do that for the
1036 =item Can't take sqrt of %g
1038 (F) For ordinary real numbers, you can't take the square root of a
1039 negative number. There's a Math::Complex package that comes standard
1040 with Perl, though, if you really want to do that.
1042 =item Can't undef active subroutine
1044 (F) You can't undefine a routine that's currently running. You can,
1045 however, redefine it while it's running, and you can even undef the
1046 redefined subroutine while the old routine is running. Go figure.
1050 (F) You tried to unshift an "unreal" array that can't be unshifted, such
1051 as the main Perl stack.
1053 =item Can't upgrade that kind of scalar
1055 (P) The internal sv_upgrade routine adds "members" to an SV, making it
1056 into a more specialized kind of SV. The top several SV types are so
1057 specialized, however, that they cannot be interconverted. This message
1058 indicates that such a conversion was attempted.
1060 =item Can't upgrade to undef
1062 (P) The undefined SV is the bottom of the totem pole, in the scheme of
1063 upgradability. Upgrading to undef indicates an error in the code
1066 =item Can't use anonymous symbol table for method lookup
1068 (F) The internal routine that does method lookup was handed a symbol
1069 table that doesn't have a name. Symbol tables can become anonymous
1070 for example by undefining stashes: C<undef %Some::Package::>.
1072 =item Can't use an undefined value as %s reference
1074 (F) A value used as either a hard reference or a symbolic reference must
1075 be a defined value. This helps to delurk some insidious errors.
1077 =item Can't use bareword ("%s") as %s ref while "strict refs" in use
1079 (F) Only hard references are allowed by "strict refs". Symbolic
1080 references are disallowed. See L<perlref>.
1082 =item Can't use %! because Errno.pm is not available
1084 (F) The first time the %! hash is used, perl automatically loads the
1085 Errno.pm module. The Errno module is expected to tie the %! hash to
1086 provide symbolic names for C<$!> errno values.
1088 =item Can't use both '<' and '>' after type '%c' in %s
1090 (F) A type cannot be forced to have both big-endian and little-endian
1091 byte-order at the same time, so this combination of modifiers is not
1092 allowed. See L<perlfunc/pack>.
1094 =item Can't use %s for loop variable
1096 (F) Only a simple scalar variable may be used as a loop variable on a
1099 =item Can't use global %s in "my"
1101 (F) You tried to declare a magical variable as a lexical variable. This
1102 is not allowed, because the magic can be tied to only one location
1103 (namely the global variable) and it would be incredibly confusing to
1104 have variables in your program that looked like magical variables but
1107 =item Can't use '%c' in a group with different byte-order in %s
1109 (F) You attempted to force a different byte-order on a type
1110 that is already inside a group with a byte-order modifier.
1111 For example you cannot force little-endianness on a type that
1112 is inside a big-endian group.
1114 =item Can't use "my %s" in sort comparison
1116 (F) The global variables $a and $b are reserved for sort comparisons.
1117 You mentioned $a or $b in the same line as the <=> or cmp operator,
1118 and the variable had earlier been declared as a lexical variable.
1119 Either qualify the sort variable with the package name, or rename the
1122 =item Can't use %s ref as %s ref
1124 (F) You've mixed up your reference types. You have to dereference a
1125 reference of the type needed. You can use the ref() function to
1126 test the type of the reference, if need be.
1128 =item Can't use string ("%s") as %s ref while "strict refs" in use
1130 (F) Only hard references are allowed by "strict refs". Symbolic
1131 references are disallowed. See L<perlref>.
1133 =item Can't use subscript on %s
1135 (F) The compiler tried to interpret a bracketed expression as a
1136 subscript. But to the left of the brackets was an expression that
1137 didn't look like an array reference, or anything else subscriptable.
1139 =item Can't use \%c to mean $%c in expression
1141 (W syntax) In an ordinary expression, backslash is a unary operator that
1142 creates a reference to its argument. The use of backslash to indicate a
1143 backreference to a matched substring is valid only as part of a regular
1144 expression pattern. Trying to do this in ordinary Perl code produces a
1145 value that prints out looking like SCALAR(0xdecaf). Use the $1 form
1148 =item Can't weaken a nonreference
1150 (F) You attempted to weaken something that was not a reference. Only
1151 references can be weakened.
1153 =item Can't x= to read-only value
1155 (F) You tried to repeat a constant value (often the undefined value)
1156 with an assignment operator, which implies modifying the value itself.
1157 Perhaps you need to copy the value to a temporary, and repeat that.
1159 =item Character in 'C' format wrapped in pack
1165 where $x is either less than 0 or more than 255; the C<"C"> format is
1166 only for encoding native operating system characters (ASCII, EBCDIC,
1167 and so on) and not for Unicode characters, so Perl behaved as if you meant
1171 If you actually want to pack Unicode codepoints, use the C<"U"> format
1174 =item Character in 'W' format wrapped in pack
1180 where $x is either less than 0 or more than 255. However, C<U0>-mode expects
1181 all values to fall in the interval [0, 255], so Perl behaved as if you
1184 pack("U0W", $x & 255)
1186 =item Character in 'c' format wrapped in pack
1192 where $x is either less than -128 or more than 127; the C<"c"> format
1193 is only for encoding native operating system characters (ASCII, EBCDIC,
1194 and so on) and not for Unicode characters, so Perl behaved as if you meant
1196 pack("c", $x & 255);
1198 If you actually want to pack Unicode codepoints, use the C<"U"> format
1201 =item Character in '%c' format wrapped in unpack
1203 (W unpack) You tried something like
1205 unpack("H", "\x{2a1}")
1207 where the format expects to process a byte (a character with a value
1208 below 256), but a higher value was provided instead. Perl uses the value
1209 modulus 256 instead, as if you had provided:
1211 unpack("H", "\x{a1}")
1213 =item Character(s) in '%c' format wrapped in pack
1215 (W pack) You tried something like
1217 pack("u", "\x{1f3}b")
1219 where the format expects to process a sequence of bytes (character with a
1220 value below 256), but some of the characters had a higher value. Perl
1221 uses the character values modulus 256 instead, as if you had provided:
1223 pack("u", "\x{f3}b")
1225 =item Character(s) in '%c' format wrapped in unpack
1227 (W unpack) You tried something like
1229 unpack("s", "\x{1f3}b")
1231 where the format expects to process a sequence of bytes (character with a
1232 value below 256), but some of the characters had a higher value. Perl
1233 uses the character values modulus 256 instead, as if you had provided:
1235 unpack("s", "\x{f3}b")
1237 =item close() on unopened filehandle %s
1239 (W unopened) You tried to close a filehandle that was never opened.
1241 =item Code missing after '/'
1243 (F) You had a (sub-)template that ends with a '/'. There must be another
1244 template code following the slash. See L<perlfunc/pack>.
1246 =item %s: Command not found
1248 (A) You've accidentally run your script through B<csh> instead of Perl.
1249 Check the #! line, or manually feed your script into Perl yourself.
1251 =item Compilation failed in require
1253 (F) Perl could not compile a file specified in a C<require> statement.
1254 Perl uses this generic message when none of the errors that it
1255 encountered were severe enough to halt compilation immediately.
1257 =item Complex regular subexpression recursion limit (%d) exceeded
1259 (W regexp) The regular expression engine uses recursion in complex
1260 situations where back-tracking is required. Recursion depth is limited
1261 to 32766, or perhaps less in architectures where the stack cannot grow
1262 arbitrarily. ("Simple" and "medium" situations are handled without
1263 recursion and are not subject to a limit.) Try shortening the string
1264 under examination; looping in Perl code (e.g. with C<while>) rather than
1265 in the regular expression engine; or rewriting the regular expression so
1266 that it is simpler or backtracks less. (See L<perlfaq2> for information
1267 on I<Mastering Regular Expressions>.)
1269 =item cond_broadcast() called on unlocked variable
1271 (W threads) Within a thread-enabled program, you tried to call
1272 cond_broadcast() on a variable which wasn't locked. The cond_broadcast()
1273 function is used to wake up another thread that is waiting in a
1274 cond_wait(). To ensure that the signal isn't sent before the other thread
1275 has a chance to enter the wait, it is usual for the signaling thread to
1276 first wait for a lock on variable. This lock attempt will only succeed
1277 after the other thread has entered cond_wait() and thus relinquished the
1280 =item cond_signal() called on unlocked variable
1282 (W threads) Within a thread-enabled program, you tried to call
1283 cond_signal() on a variable which wasn't locked. The cond_signal()
1284 function is used to wake up another thread that is waiting in a
1285 cond_wait(). To ensure that the signal isn't sent before the other thread
1286 has a chance to enter the wait, it is usual for the signaling thread to
1287 first wait for a lock on variable. This lock attempt will only succeed
1288 after the other thread has entered cond_wait() and thus relinquished the
1291 =item connect() on closed socket %s
1293 (W closed) You tried to do a connect on a closed socket. Did you forget
1294 to check the return value of your socket() call? See
1295 L<perlfunc/connect>.
1297 =item Constant(%s)%s: %s
1299 (F) The parser found inconsistencies either while attempting to define
1300 an overloaded constant, or when trying to find the character name
1301 specified in the C<\N{...}> escape. Perhaps you forgot to load the
1302 corresponding C<overload> or C<charnames> pragma? See L<charnames> and
1305 =item Constant is not %s reference
1307 (F) A constant value (perhaps declared using the C<use constant> pragma)
1308 is being dereferenced, but it amounts to the wrong type of reference.
1309 The message indicates the type of reference that was expected. This
1310 usually indicates a syntax error in dereferencing the constant value.
1311 See L<perlsub/"Constant Functions"> and L<constant>.
1313 =item Constant subroutine %s redefined
1315 (S) You redefined a subroutine which had previously been
1316 eligible for inlining. See L<perlsub/"Constant Functions"> for
1317 commentary and workarounds.
1319 =item Constant subroutine %s undefined
1321 (W misc) You undefined a subroutine which had previously been eligible
1322 for inlining. See L<perlsub/"Constant Functions"> for commentary and
1325 =item Copy method did not return a reference
1327 (F) The method which overloads "=" is buggy. See
1328 L<overload/Copy Constructor>.
1330 =item CORE::%s is not a keyword
1332 (F) The CORE:: namespace is reserved for Perl keywords.
1334 =item corrupted regexp pointers
1336 (P) The regular expression engine got confused by what the regular
1337 expression compiler gave it.
1339 =item corrupted regexp program
1341 (P) The regular expression engine got passed a regexp program without a
1344 =item Corrupt malloc ptr 0x%lx at 0x%lx
1346 (P) The malloc package that comes with Perl had an internal failure.
1348 =item Count after length/code in unpack
1350 (F) You had an unpack template indicating a counted-length string, but
1351 you have also specified an explicit size for the string. See
1354 =item Deep recursion on subroutine "%s"
1356 (W recursion) This subroutine has called itself (directly or indirectly)
1357 100 times more than it has returned. This probably indicates an
1358 infinite recursion, unless you're writing strange benchmark programs, in
1359 which case it indicates something else.
1361 =item defined(@array) is deprecated
1363 (D deprecated) defined() is not usually useful on arrays because it
1364 checks for an undefined I<scalar> value. If you want to see if the
1365 array is empty, just use C<if (@array) { # not empty }> for example.
1367 =item defined(%hash) is deprecated
1369 (D deprecated) defined() is not usually useful on hashes because it
1370 checks for an undefined I<scalar> value. If you want to see if the hash
1371 is empty, just use C<if (%hash) { # not empty }> for example.
1373 =item %s defines neither package nor VERSION--version check failed
1375 (F) You said something like "use Module 42" but in the Module file
1376 there are neither package declarations nor a C<$VERSION>.
1378 =item Delimiter for here document is too long
1380 (F) In a here document construct like C<<<FOO>, the label C<FOO> is too
1381 long for Perl to handle. You have to be seriously twisted to write code
1382 that triggers this error.
1384 =item Deprecated use of my() in false conditional
1386 (D deprecated) You used a declaration similar to C<my $x if 0>.
1387 There has been a long-standing bug in Perl that causes a lexical variable
1388 not to be cleared at scope exit when its declaration includes a false
1389 conditional. Some people have exploited this bug to achieve a kind of
1390 static variable. Since we intend to fix this bug, we don't want people
1391 relying on this behavior. You can achieve a similar static effect by
1392 declaring the variable in a separate block outside the function, eg
1394 sub f { my $x if 0; return $x++ }
1398 { my $x; sub f { return $x++ } }
1400 =item DESTROY created new reference to dead object '%s'
1402 (F) A DESTROY() method created a new reference to the object which is
1403 just being DESTROYed. Perl is confused, and prefers to abort rather than
1404 to create a dangling reference.
1406 =item Did not produce a valid header
1410 =item %s did not return a true value
1412 (F) A required (or used) file must return a true value to indicate that
1413 it compiled correctly and ran its initialization code correctly. It's
1414 traditional to end such a file with a "1;", though any true value would
1415 do. See L<perlfunc/require>.
1417 =item (Did you mean &%s instead?)
1419 (W) You probably referred to an imported subroutine &FOO as $FOO or some
1422 =item (Did you mean "local" instead of "our"?)
1424 (W misc) Remember that "our" does not localize the declared global
1425 variable. You have declared it again in the same lexical scope, which
1428 =item (Did you mean $ or @ instead of %?)
1430 (W) You probably said %hash{$key} when you meant $hash{$key} or
1431 @hash{@keys}. On the other hand, maybe you just meant %hash and got
1436 (F) You passed die() an empty string (the equivalent of C<die "">) or
1437 you called it with no args and both C<$@> and C<$_> were empty.
1439 =item Document contains no data
1443 =item %s does not define %s::VERSION--version check failed
1445 (F) You said something like "use Module 42" but the Module did not
1446 define a C<$VERSION.>
1448 =item '/' does not take a repeat count
1450 (F) You cannot put a repeat count of any kind right after the '/' code.
1451 See L<perlfunc/pack>.
1453 =item Don't know how to handle magic of type '%s'
1455 (P) The internal handling of magical variables has been cursed.
1457 =item do_study: out of memory
1459 (P) This should have been caught by safemalloc() instead.
1461 =item (Do you need to predeclare %s?)
1463 (S syntax) This is an educated guess made in conjunction with the message
1464 "%s found where operator expected". It often means a subroutine or module
1465 name is being referenced that hasn't been declared yet. This may be
1466 because of ordering problems in your file, or because of a missing
1467 "sub", "package", "require", or "use" statement. If you're referencing
1468 something that isn't defined yet, you don't actually have to define the
1469 subroutine or package before the current location. You can use an empty
1470 "sub foo;" or "package FOO;" to enter a "forward" declaration.
1472 =item dump() better written as CORE::dump()
1474 (W misc) You used the obsolescent C<dump()> built-in function, without fully
1475 qualifying it as C<CORE::dump()>. Maybe it's a typo. See L<perlfunc/dump>.
1477 =item Duplicate free() ignored
1479 (S malloc) An internal routine called free() on something that had
1482 =item Duplicate modifier '%c' after '%c' in %s
1484 (W) You have applied the same modifier more than once after a type
1485 in a pack template. See L<perlfunc/pack>.
1487 =item elseif should be elsif
1489 (S syntax) There is no keyword "elseif" in Perl because Larry thinks it's
1490 ugly. Your code will be interpreted as an attempt to call a method named
1491 "elseif" for the class returned by the following block. This is
1492 unlikely to be what you want.
1496 (F) C<\p> and C<\P> are used to introduce a named Unicode property, as
1497 described in L<perlunicode> and L<perlre>. You used C<\p> or C<\P> in
1498 a regular expression without specifying the property name.
1500 =item entering effective %s failed
1502 (F) While under the C<use filetest> pragma, switching the real and
1503 effective uids or gids failed.
1505 =item %ENV is aliased to %s
1507 (F) You're running under taint mode, and the C<%ENV> variable has been
1508 aliased to another hash, so it doesn't reflect anymore the state of the
1509 program's environment. This is potentially insecure.
1511 =item Error converting file specification %s
1513 (F) An error peculiar to VMS. Because Perl may have to deal with file
1514 specifications in either VMS or Unix syntax, it converts them to a
1515 single form when it must operate on them directly. Either you've passed
1516 an invalid file specification to Perl, or you've found a case the
1517 conversion routines don't handle. Drat.
1519 =item %s: Eval-group in insecure regular expression
1521 (F) Perl detected tainted data when trying to compile a regular
1522 expression that contains the C<(?{ ... })> zero-width assertion, which
1523 is unsafe. See L<perlre/(?{ code })>, and L<perlsec>.
1525 =item %s: Eval-group not allowed at run time
1527 (F) Perl tried to compile a regular expression containing the
1528 C<(?{ ... })> zero-width assertion at run time, as it would when the
1529 pattern contains interpolated values. Since that is a security risk, it
1530 is not allowed. If you insist, you may still do this by explicitly
1531 building the pattern from an interpolated string at run time and using
1532 that in an eval(). See L<perlre/(?{ code })>.
1534 =item %s: Eval-group not allowed, use re 'eval'
1536 (F) A regular expression contained the C<(?{ ... })> zero-width
1537 assertion, but that construct is only allowed when the C<use re 'eval'>
1538 pragma is in effect. See L<perlre/(?{ code })>.
1540 =item Excessively long <> operator
1542 (F) The contents of a <> operator may not exceed the maximum size of a
1543 Perl identifier. If you're just trying to glob a long list of
1544 filenames, try using the glob() operator, or put the filenames into a
1545 variable and glob that.
1547 =item exec? I'm not *that* kind of operating system
1549 (F) The C<exec> function is not implemented in MacPerl. See L<perlport>.
1551 =item Execution of %s aborted due to compilation errors
1553 (F) The final summary message when a Perl compilation fails.
1555 =item Exiting eval via %s
1557 (W exiting) You are exiting an eval by unconventional means, such as a
1558 goto, or a loop control statement.
1560 =item Exiting format via %s
1562 (W exiting) You are exiting a format by unconventional means, such as a
1563 goto, or a loop control statement.
1565 =item Exiting pseudo-block via %s
1567 (W exiting) You are exiting a rather special block construct (like a
1568 sort block or subroutine) by unconventional means, such as a goto, or a
1569 loop control statement. See L<perlfunc/sort>.
1571 =item Exiting subroutine via %s
1573 (W exiting) You are exiting a subroutine by unconventional means, such
1574 as a goto, or a loop control statement.
1576 =item Exiting substitution via %s
1578 (W exiting) You are exiting a substitution by unconventional means, such
1579 as a return, a goto, or a loop control statement.
1581 =item Explicit blessing to '' (assuming package main)
1583 (W misc) You are blessing a reference to a zero length string. This has
1584 the effect of blessing the reference into the package main. This is
1585 usually not what you want. Consider providing a default target package,
1586 e.g. bless($ref, $p || 'MyPackage');
1588 =item %s: Expression syntax
1590 (A) You've accidentally run your script through B<csh> instead of Perl.
1591 Check the #! line, or manually feed your script into Perl yourself.
1593 =item %s failed--call queue aborted
1595 (F) An untrapped exception was raised while executing a CHECK, INIT, or
1596 END subroutine. Processing of the remainder of the queue of such
1597 routines has been prematurely ended.
1599 =item False [] range "%s" in regex; marked by <-- HERE in m/%s/
1601 (W regexp) A character class range must start and end at a literal
1602 character, not another character class like C<\d> or C<[:alpha:]>. The "-"
1603 in your false range is interpreted as a literal "-". Consider quoting the
1604 "-", "\-". The <-- HERE shows in the regular expression about where the
1605 problem was discovered. See L<perlre>.
1607 =item Fatal VMS error at %s, line %d
1609 (P) An error peculiar to VMS. Something untoward happened in a VMS
1610 system service or RTL routine; Perl's exit status should provide more
1611 details. The filename in "at %s" and the line number in "line %d" tell
1612 you which section of the Perl source code is distressed.
1614 =item fcntl is not implemented
1616 (F) Your machine apparently doesn't implement fcntl(). What is this, a
1617 PDP-11 or something?
1619 =item Field too wide in 'u' format in pack
1621 (W pack) Each line in an uuencoded string start with a length indicator
1622 which can't encode values above 63. So there is no point in asking for
1623 a line length bigger than that. Perl will behave as if you specified
1626 =item Filehandle %s opened only for input
1628 (W io) You tried to write on a read-only filehandle. If you intended
1629 it to be a read-write filehandle, you needed to open it with "+<" or
1630 "+>" or "+>>" instead of with "<" or nothing. If you intended only to
1631 write the file, use ">" or ">>". See L<perlfunc/open>.
1633 =item Filehandle %s opened only for output
1635 (W io) You tried to read from a filehandle opened only for writing, If
1636 you intended it to be a read/write filehandle, you needed to open it
1637 with "+<" or "+>" or "+>>" instead of with "<" or nothing. If you
1638 intended only to read from the file, use "<". See L<perlfunc/open>.
1639 Another possibility is that you attempted to open filedescriptor 0
1640 (also known as STDIN) for output (maybe you closed STDIN earlier?).
1642 =item Filehandle %s reopened as %s only for input
1644 (W io) You opened for reading a filehandle that got the same filehandle id
1645 as STDOUT or STDERR. This occured because you closed STDOUT or STDERR
1648 =item Filehandle STDIN reopened as %s only for output
1650 (W io) You opened for writing a filehandle that got the same filehandle id
1651 as STDIN. This occured because you closed STDIN previously.
1653 =item Final $ should be \$ or $name
1655 (F) You must now decide whether the final $ in a string was meant to be
1656 a literal dollar sign, or was meant to introduce a variable name that
1657 happens to be missing. So you have to put either the backslash or the
1660 =item flock() on closed filehandle %s
1662 (W closed) The filehandle you're attempting to flock() got itself closed
1663 some time before now. Check your control flow. flock() operates on
1664 filehandles. Are you attempting to call flock() on a dirhandle by the
1667 =item Format not terminated
1669 (F) A format must be terminated by a line with a solitary dot. Perl got
1670 to the end of your file without finding such a line.
1672 =item Format %s redefined
1674 (W redefine) You redefined a format. To suppress this warning, say
1677 no warnings 'redefine';
1678 eval "format NAME =...";
1681 =item Found = in conditional, should be ==
1691 (or something like that).
1693 =item %s found where operator expected
1695 (S syntax) The Perl lexer knows whether to expect a term or an operator.
1696 If it sees what it knows to be a term when it was expecting to see an
1697 operator, it gives you this warning. Usually it indicates that an
1698 operator or delimiter was omitted, such as a semicolon.
1700 =item gdbm store returned %d, errno %d, key "%s"
1702 (S) A warning from the GDBM_File extension that a store failed.
1704 =item gethostent not implemented
1706 (F) Your C library apparently doesn't implement gethostent(), probably
1707 because if it did, it'd feel morally obligated to return every hostname
1710 =item get%sname() on closed socket %s
1712 (W closed) You tried to get a socket or peer socket name on a closed
1713 socket. Did you forget to check the return value of your socket() call?
1715 =item getpwnam returned invalid UIC %#o for user "%s"
1717 (S) A warning peculiar to VMS. The call to C<sys$getuai> underlying the
1718 C<getpwnam> operator returned an invalid UIC.
1720 =item getsockopt() on closed socket %s
1722 (W closed) You tried to get a socket option on a closed socket. Did you
1723 forget to check the return value of your socket() call? See
1724 L<perlfunc/getsockopt>.
1726 =item Global symbol "%s" requires explicit package name
1728 (F) You've said "use strict vars", which indicates that all variables
1729 must either be lexically scoped (using "my"), declared beforehand using
1730 "our", or explicitly qualified to say which package the global variable
1733 =item glob failed (%s)
1735 (W glob) Something went wrong with the external program(s) used for
1736 C<glob> and C<< <*.c> >>. Usually, this means that you supplied a
1737 C<glob> pattern that caused the external program to fail and exit with a
1738 nonzero status. If the message indicates that the abnormal exit
1739 resulted in a coredump, this may also mean that your csh (C shell) is
1740 broken. If so, you should change all of the csh-related variables in
1741 config.sh: If you have tcsh, make the variables refer to it as if it
1742 were csh (e.g. C<full_csh='/usr/bin/tcsh'>); otherwise, make them all
1743 empty (except that C<d_csh> should be C<'undef'>) so that Perl will
1744 think csh is missing. In either case, after editing config.sh, run
1745 C<./Configure -S> and rebuild Perl.
1747 =item Glob not terminated
1749 (F) The lexer saw a left angle bracket in a place where it was expecting
1750 a term, so it's looking for the corresponding right angle bracket, and
1751 not finding it. Chances are you left some needed parentheses out
1752 earlier in the line, and you really meant a "less than".
1754 =item Got an error from DosAllocMem
1756 (P) An error peculiar to OS/2. Most probably you're using an obsolete
1757 version of Perl, and this should not happen anyway.
1759 =item goto must have label
1761 (F) Unlike with "next" or "last", you're not allowed to goto an
1762 unspecified destination. See L<perlfunc/goto>.
1764 =item ()-group starts with a count
1766 (F) A ()-group started with a count. A count is
1767 supposed to follow something: a template character or a ()-group.
1768 See L<perlfunc/pack>.
1770 =item %s had compilation errors
1772 (F) The final summary message when a C<perl -c> fails.
1774 =item Had to create %s unexpectedly
1776 (S internal) A routine asked for a symbol from a symbol table that ought
1777 to have existed already, but for some reason it didn't, and had to be
1778 created on an emergency basis to prevent a core dump.
1780 =item Hash %%s missing the % in argument %d of %s()
1782 (D deprecated) Really old Perl let you omit the % on hash names in some
1783 spots. This is now heavily deprecated.
1785 =item %s has too many errors
1787 (F) The parser has given up trying to parse the program after 10 errors.
1788 Further error messages would likely be uninformative.
1790 =item Hexadecimal number > 0xffffffff non-portable
1792 (W portable) The hexadecimal number you specified is larger than 2**32-1
1793 (4294967295) and therefore non-portable between systems. See
1794 L<perlport> for more on portability concerns.
1796 =item Identifier too long
1798 (F) Perl limits identifiers (names for variables, functions, etc.) to
1799 about 250 characters for simple names, and somewhat more for compound
1800 names (like C<$A::B>). You've exceeded Perl's limits. Future versions
1801 of Perl are likely to eliminate these arbitrary limitations.
1803 =item Illegal binary digit %s
1805 (F) You used a digit other than 0 or 1 in a binary number.
1807 =item Illegal binary digit %s ignored
1809 (W digit) You may have tried to use a digit other than 0 or 1 in a
1810 binary number. Interpretation of the binary number stopped before the
1813 =item Illegal character %s (carriage return)
1815 (F) Perl normally treats carriage returns in the program text as it
1816 would any other whitespace, which means you should never see this error
1817 when Perl was built using standard options. For some reason, your
1818 version of Perl appears to have been built without this support. Talk
1819 to your Perl administrator.
1821 =item Illegal character in prototype for %s : %s
1823 (W syntax) An illegal character was found in a prototype declaration. Legal
1824 characters in prototypes are $, @, %, *, ;, [, ], &, and \.
1826 =item Illegal declaration of anonymous subroutine
1828 (F) When using the C<sub> keyword to construct an anonymous subroutine,
1829 you must always specify a block of code. See L<perlsub>.
1831 =item Illegal declaration of subroutine %s
1833 (F) A subroutine was not declared correctly. See L<perlsub>.
1835 =item Illegal division by zero
1837 (F) You tried to divide a number by 0. Either something was wrong in
1838 your logic, or you need to put a conditional in to guard against
1841 =item Illegal hexadecimal digit %s ignored
1843 (W digit) You may have tried to use a character other than 0 - 9 or
1844 A - F, a - f in a hexadecimal number. Interpretation of the hexadecimal
1845 number stopped before the illegal character.
1847 =item Illegal modulus zero
1849 (F) You tried to divide a number by 0 to get the remainder. Most
1850 numbers don't take to this kindly.
1852 =item Illegal number of bits in vec
1854 (F) The number of bits in vec() (the third argument) must be a power of
1855 two from 1 to 32 (or 64, if your platform supports that).
1857 =item Illegal octal digit %s
1859 (F) You used an 8 or 9 in an octal number.
1861 =item Illegal octal digit %s ignored
1863 (W digit) You may have tried to use an 8 or 9 in an octal number.
1864 Interpretation of the octal number stopped before the 8 or 9.
1866 =item Illegal switch in PERL5OPT: %s
1868 (X) The PERL5OPT environment variable may only be used to set the
1869 following switches: B<-[DIMUdmtw]>.
1871 =item Ill-formed CRTL environ value "%s"
1873 (W internal) A warning peculiar to VMS. Perl tried to read the CRTL's
1874 internal environ array, and encountered an element without the C<=>
1875 delimiter used to separate keys from values. The element is ignored.
1877 =item Ill-formed message in prime_env_iter: |%s|
1879 (W internal) A warning peculiar to VMS. Perl tried to read a logical
1880 name or CLI symbol definition when preparing to iterate over %ENV, and
1881 didn't see the expected delimiter between key and value, so the line was
1884 =item Impossible to activate assertion call
1886 (W assertions) You're calling an assertion function in a block that is
1887 not under the control of the C<assertions> pragma.
1889 =item (in cleanup) %s
1891 (W misc) This prefix usually indicates that a DESTROY() method raised
1892 the indicated exception. Since destructors are usually called by the
1893 system at arbitrary points during execution, and often a vast number of
1894 times, the warning is issued only once for any number of failures that
1895 would otherwise result in the same message being repeated.
1897 Failure of user callbacks dispatched using the C<G_KEEPERR> flag could
1898 also result in this warning. See L<perlcall/G_KEEPERR>.
1900 =item In EBCDIC the v-string components cannot exceed 2147483647
1902 (F) An error peculiar to EBCDIC. Internally, v-strings are stored as
1903 Unicode code points, and encoded in EBCDIC as UTF-EBCDIC. The UTF-EBCDIC
1904 encoding is limited to code points no larger than 2147483647 (0x7FFFFFFF).
1906 =item Insecure dependency in %s
1908 (F) You tried to do something that the tainting mechanism didn't like.
1909 The tainting mechanism is turned on when you're running setuid or
1910 setgid, or when you specify B<-T> to turn it on explicitly. The
1911 tainting mechanism labels all data that's derived directly or indirectly
1912 from the user, who is considered to be unworthy of your trust. If any
1913 such data is used in a "dangerous" operation, you get this error. See
1914 L<perlsec> for more information.
1916 =item Insecure directory in %s
1918 (F) You can't use system(), exec(), or a piped open in a setuid or
1919 setgid script if C<$ENV{PATH}> contains a directory that is writable by
1920 the world. Also, the PATH must not contain any relative directory.
1923 =item Insecure $ENV{%s} while running %s
1925 (F) You can't use system(), exec(), or a piped open in a setuid or
1926 setgid script if any of C<$ENV{PATH}>, C<$ENV{IFS}>, C<$ENV{CDPATH}>,
1927 C<$ENV{ENV}>, C<$ENV{BASH_ENV}> or C<$ENV{TERM}> are derived from data
1928 supplied (or potentially supplied) by the user. The script must set
1929 the path to a known value, using trustworthy data. See L<perlsec>.
1931 =item Integer overflow in %s number
1933 (W overflow) The hexadecimal, octal or binary number you have specified
1934 either as a literal or as an argument to hex() or oct() is too big for
1935 your architecture, and has been converted to a floating point number.
1936 On a 32-bit architecture the largest hexadecimal, octal or binary number
1937 representable without overflow is 0xFFFFFFFF, 037777777777, or
1938 0b11111111111111111111111111111111 respectively. Note that Perl
1939 transparently promotes all numbers to a floating point representation
1940 internally--subject to loss of precision errors in subsequent
1943 =item Integer overflow in version
1945 (F) Some portion of a version initialization is too large for the
1946 size of integers for your architecture. This is not a warning
1947 because there is no rational reason for a version to try and use a
1948 element larger than typically 2**32. This is usually caused by
1949 trying to use some odd mathematical operation as a version, like
1952 =item Internal disaster in regex; marked by <-- HERE in m/%s/
1954 (P) Something went badly wrong in the regular expression parser.
1955 The <-- HERE shows in the regular expression about where the problem was
1958 =item Internal inconsistency in tracking vforks
1960 (S) A warning peculiar to VMS. Perl keeps track of the number of times
1961 you've called C<fork> and C<exec>, to determine whether the current call
1962 to C<exec> should affect the current script or a subprocess (see
1963 L<perlvms/"exec LIST">). Somehow, this count has become scrambled, so
1964 Perl is making a guess and treating this C<exec> as a request to
1965 terminate the Perl script and execute the specified command.
1967 =item Internal urp in regex; marked by <-- HERE in m/%s/
1969 (P) Something went badly awry in the regular expression parser. The
1970 <-- HERE shows in the regular expression about where the problem was
1973 =item %s (...) interpreted as function
1975 (W syntax) You've run afoul of the rule that says that any list operator
1976 followed by parentheses turns into a function, with all the list
1977 operators arguments found inside the parentheses. See
1978 L<perlop/Terms and List Operators (Leftward)>.
1980 =item Invalid %s attribute: %s
1982 The indicated attribute for a subroutine or variable was not recognized
1983 by Perl or by a user-supplied handler. See L<attributes>.
1985 =item Invalid %s attributes: %s
1987 The indicated attributes for a subroutine or variable were not
1988 recognized by Perl or by a user-supplied handler. See L<attributes>.
1990 =item Invalid conversion in %s: "%s"
1992 (W printf) Perl does not understand the given format conversion. See
1993 L<perlfunc/sprintf>.
1995 =item Invalid [] range "%s" in regex; marked by <-- HERE in m/%s/
1997 (F) The range specified in a character class had a minimum character
1998 greater than the maximum character. One possibility is that you forgot the
1999 C<{}> from your ending C<\x{}> - C<\x> without the curly braces can go only
2000 up to C<ff>. The <-- HERE shows in the regular expression about where the
2001 problem was discovered. See L<perlre>.
2003 =item Invalid range "%s" in transliteration operator
2005 (F) The range specified in the tr/// or y/// operator had a minimum
2006 character greater than the maximum character. See L<perlop>.
2008 =item Invalid separator character %s in attribute list
2010 (F) Something other than a colon or whitespace was seen between the
2011 elements of an attribute list. If the previous attribute had a
2012 parenthesised parameter list, perhaps that list was terminated too soon.
2015 =item Invalid separator character %s in PerlIO layer specification %s
2017 (W layer) When pushing layers onto the Perl I/O system, something other than a
2018 colon or whitespace was seen between the elements of a layer list.
2019 If the previous attribute had a parenthesised parameter list, perhaps that
2020 list was terminated too soon.
2022 =item Invalid type '%s' in %s
2024 (F) The given character is not a valid pack or unpack type.
2025 See L<perlfunc/pack>.
2026 (W) The given character is not a valid pack or unpack type but used to be
2029 =item Invalid version format (multiple underscores)
2031 (F) Versions may contain at most a single underscore, which signals
2032 that the version is a beta release. See L<version> for the allowed
2035 =item Invalid version format (underscores before decimal)
2037 (F) Versions may not contain decimals after the optional underscore.
2038 See L<version> for the allowed version formats.
2040 =item ioctl is not implemented
2042 (F) Your machine apparently doesn't implement ioctl(), which is pretty
2043 strange for a machine that supports C.
2045 =item ioctl() on unopened %s
2047 (W unopened) You tried ioctl() on a filehandle that was never opened.
2048 Check you control flow and number of arguments.
2050 =item IO layers (like "%s") unavailable
2052 (F) Your Perl has not been configured to have PerlIO, and therefore
2053 you cannot use IO layers. To have PerlIO Perl must be configured
2056 =item IO::Socket::atmark not implemented on this architecture
2058 (F) Your machine doesn't implement the sockatmark() functionality,
2059 neither as a system call or an ioctl call (SIOCATMARK).
2061 =item $* is no longer supported
2063 (D deprecated) The special variable C<$*>, deprecated in older perls, has
2064 been removed as of 5.9.0 and is no longer supported. You should use the
2065 C<//m> and C<//s> regexp modifiers instead.
2067 =item $# is no longer supported
2069 (D deprecated) The special variable C<$#>, deprecated in older perls, has
2070 been removed as of 5.9.3 and is no longer supported. You should use the
2071 printf/sprintf functions instead.
2073 =item `%s' is not a code reference
2075 (W overload) The second (fourth, sixth, ...) argument of overload::constant
2076 needs to be a code reference. Either an anonymous subroutine, or a reference
2079 =item `%s' is not an overloadable type
2081 (W overload) You tried to overload a constant type the overload package is
2084 =item junk on end of regexp
2086 (P) The regular expression parser is confused.
2088 =item Label not found for "last %s"
2090 (F) You named a loop to break out of, but you're not currently in a loop
2091 of that name, not even if you count where you were called from. See
2094 =item Label not found for "next %s"
2096 (F) You named a loop to continue, but you're not currently in a loop of
2097 that name, not even if you count where you were called from. See
2100 =item Label not found for "redo %s"
2102 (F) You named a loop to restart, but you're not currently in a loop of
2103 that name, not even if you count where you were called from. See
2106 =item leaving effective %s failed
2108 (F) While under the C<use filetest> pragma, switching the real and
2109 effective uids or gids failed.
2111 =item length/code after end of string in unpack
2113 (F) While unpacking, the string buffer was alread used up when an unpack
2114 length/code combination tried to obtain more data. This results in
2115 an undefined value for the length. See L<perlfunc/pack>.
2117 =item listen() on closed socket %s
2119 (W closed) You tried to do a listen on a closed socket. Did you forget
2120 to check the return value of your socket() call? See
2123 =item Lookbehind longer than %d not implemented in regex; marked by <-- HERE in m/%s/
2125 (F) There is currently a limit on the length of string which lookbehind can
2126 handle. This restriction may be eased in a future release. The <-- HERE
2127 shows in the regular expression about where the problem was discovered.
2129 =item lstat() on filehandle %s
2131 (W io) You tried to do an lstat on a filehandle. What did you mean
2132 by that? lstat() makes sense only on filenames. (Perl did a fstat()
2133 instead on the filehandle.)
2135 =item Lvalue subs returning %s not implemented yet
2137 (F) Due to limitations in the current implementation, array and hash
2138 values cannot be returned in subroutines used in lvalue context. See
2139 L<perlsub/"Lvalue subroutines">.
2141 =item Malformed integer in [] in pack
2143 (F) Between the brackets enclosing a numeric repeat count only digits
2144 are permitted. See L<perlfunc/pack>.
2146 =item Malformed integer in [] in unpack
2148 (F) Between the brackets enclosing a numeric repeat count only digits
2149 are permitted. See L<perlfunc/pack>.
2151 =item Malformed PERLLIB_PREFIX
2153 (F) An error peculiar to OS/2. PERLLIB_PREFIX should be of the form
2160 with nonempty prefix1 and prefix2. If C<prefix1> is indeed a prefix of
2161 a builtin library search path, prefix2 is substituted. The error may
2162 appear if components are not found, or are too long. See
2163 "PERLLIB_PREFIX" in L<perlos2>.
2165 =item Malformed prototype for %s: %s
2167 (F) You tried to use a function with a malformed prototype. The
2168 syntax of function prototypes is given a brief compile-time check for
2169 obvious errors like invalid characters. A more rigorous check is run
2170 when the function is called.
2172 =item Malformed UTF-8 character (%s)
2174 (W utf8) Perl detected something that didn't comply with UTF-8 encoding rules.
2176 One possible cause is that you read in data that you thought to be in
2177 UTF-8 but it wasn't (it was for example legacy 8-bit data). Another
2178 possibility is careless use of utf8::upgrade().
2180 =item Malformed UTF-16 surrogate
2182 Perl thought it was reading UTF-16 encoded character data but while
2183 doing it Perl met a malformed Unicode surrogate.
2185 =item Malformed UTF-8 string in pack
2187 (F) You tried to pack something that didn't comply with UTF-8 encoding
2188 rules and perl was unable to guess how to make more progress.
2190 =item Malformed UTF-8 string in unpack
2192 (F) You tried to unpack something that didn't comply with UTF-8 encoding
2193 rules and perl was unable to guess how to make more progress.
2195 =item Malformed UTF-8 string in '%c' format in unpack
2197 (F) You tried to unpack something that didn't comply with UTF-8 encoding
2198 rules and perl was unable to guess how to make more progress.
2200 =item %s matches null string many times in regex; marked by <-- HERE in m/%s/
2202 (W regexp) The pattern you've specified would be an infinite loop if the
2203 regular expression engine didn't specifically check for that. The <-- HERE
2204 shows in the regular expression about where the problem was discovered.
2207 =item "%s" may clash with future reserved word
2209 (W) This warning may be due to running a perl5 script through a perl4
2210 interpreter, especially if the word that is being warned about is
2213 =item % may not be used in pack
2215 (F) You can't pack a string by supplying a checksum, because the
2216 checksumming process loses information, and you can't go the other way.
2217 See L<perlfunc/unpack>.
2219 =item Method for operation %s not found in package %s during blessing
2221 (F) An attempt was made to specify an entry in an overloading table that
2222 doesn't resolve to a valid subroutine. See L<overload>.
2224 =item Method %s not permitted
2228 =item Might be a runaway multi-line %s string starting on line %d
2230 (S) An advisory indicating that the previous error may have been caused
2231 by a missing delimiter on a string or pattern, because it eventually
2232 ended earlier on the current line.
2234 =item Misplaced _ in number
2236 (W syntax) An underscore (underbar) in a numeric constant did not
2237 separate two digits.
2239 =item Missing argument to -%c
2241 (F) The argument to the indicated command line switch must follow
2242 immediately after the switch, without intervening spaces.
2244 =item Missing %sbrace%s on \N{}
2246 (F) Wrong syntax of character name literal C<\N{charname}> within
2247 double-quotish context.
2249 =item Missing comma after first argument to %s function
2251 (F) While certain functions allow you to specify a filehandle or an
2252 "indirect object" before the argument list, this ain't one of them.
2254 =item Missing command in piped open
2256 (W pipe) You used the C<open(FH, "| command")> or
2257 C<open(FH, "command |")> construction, but the command was missing or
2260 =item Missing control char name in \c
2262 (F) A double-quoted string ended with "\c", without the required control
2265 =item Missing name in "my sub"
2267 (F) The reserved syntax for lexically scoped subroutines requires that
2268 they have a name with which they can be found.
2270 =item Missing $ on loop variable
2272 (F) Apparently you've been programming in B<csh> too much. Variables
2273 are always mentioned with the $ in Perl, unlike in the shells, where it
2274 can vary from one line to the next.
2276 =item (Missing operator before %s?)
2278 (S syntax) This is an educated guess made in conjunction with the message
2279 "%s found where operator expected". Often the missing operator is a comma.
2281 =item Missing right brace on %s
2283 (F) Missing right brace in C<\p{...}> or C<\P{...}>.
2285 =item Missing right curly or square bracket
2287 (F) The lexer counted more opening curly or square brackets than closing
2288 ones. As a general rule, you'll find it's missing near the place you
2291 =item (Missing semicolon on previous line?)
2293 (S syntax) This is an educated guess made in conjunction with the message
2294 "%s found where operator expected". Don't automatically put a semicolon on
2295 the previous line just because you saw this message.
2297 =item Modification of a read-only value attempted
2299 (F) You tried, directly or indirectly, to change the value of a
2300 constant. You didn't, of course, try "2 = 1", because the compiler
2301 catches that. But an easy way to do the same thing is:
2303 sub mod { $_[0] = 1 }
2306 Another way is to assign to a substr() that's off the end of the string.
2308 Yet another way is to assign to a C<foreach> loop I<VAR> when I<VAR>
2309 is aliased to a constant in the look I<LIST>:
2312 foreach my $n ($x, 2) {
2313 $n *= 2; # modifies the $x, but fails on attempt to modify the 2
2316 =item Modification of non-creatable array value attempted, %s
2318 (F) You tried to make an array value spring into existence, and the
2319 subscript was probably negative, even counting from end of the array
2322 =item Modification of non-creatable hash value attempted, %s
2324 (P) You tried to make a hash value spring into existence, and it
2325 couldn't be created for some peculiar reason.
2327 =item Module name must be constant
2329 (F) Only a bare module name is allowed as the first argument to a "use".
2331 =item Module name required with -%c option
2333 (F) The C<-M> or C<-m> options say that Perl should load some module, but
2334 you omitted the name of the module. Consult L<perlrun> for full details
2335 about C<-M> and C<-m>.
2337 =item More than one argument to open
2339 (F) The C<open> function has been asked to open multiple files. This
2340 can happen if you are trying to open a pipe to a command that takes a
2341 list of arguments, but have forgotten to specify a piped open mode.
2342 See L<perlfunc/open> for details.
2344 =item msg%s not implemented
2346 (F) You don't have System V message IPC on your system.
2348 =item Multidimensional syntax %s not supported
2350 (W syntax) Multidimensional arrays aren't written like C<$foo[1,2,3]>.
2351 They're written like C<$foo[1][2][3]>, as in C.
2353 =item '/' must follow a numeric type in unpack
2355 (F) You had an unpack template that contained a '/', but this did not
2356 follow some unpack specification producing a numeric value.
2357 See L<perlfunc/pack>.
2359 =item "my sub" not yet implemented
2361 (F) Lexically scoped subroutines are not yet implemented. Don't try
2364 =item "my" variable %s can't be in a package
2366 (F) Lexically scoped variables aren't in a package, so it doesn't make
2367 sense to try to declare one with a package qualifier on the front. Use
2368 local() if you want to localize a package variable.
2370 =item Name "%s::%s" used only once: possible typo
2372 (W once) Typographical errors often show up as unique variable names.
2373 If you had a good reason for having a unique name, then just mention it
2374 again somehow to suppress the message. The C<our> declaration is
2375 provided for this purpose.
2377 NOTE: This warning detects symbols that have been used only once so $c, @c,
2378 %c, *c, &c, sub c{}, c(), and c (the filehandle or format) are considered
2379 the same; if a program uses $c only once but also uses any of the others it
2380 will not trigger this warning.
2382 =item Negative '/' count in unpack
2384 (F) The length count obtained from a length/code unpack operation was
2385 negative. See L<perlfunc/pack>.
2387 =item Negative length
2389 (F) You tried to do a read/write/send/recv operation with a buffer
2390 length that is less than 0. This is difficult to imagine.
2392 =item Negative offset to vec in lvalue context
2394 (F) When C<vec> is called in an lvalue context, the second argument must be
2395 greater than or equal to zero.
2397 =item Nested quantifiers in regex; marked by <-- HERE in m/%s/
2399 (F) You can't quantify a quantifier without intervening parentheses. So
2400 things like ** or +* or ?* are illegal. The <-- HERE shows in the regular
2401 expression about where the problem was discovered.
2403 Note that the minimal matching quantifiers, C<*?>, C<+?>, and
2404 C<??> appear to be nested quantifiers, but aren't. See L<perlre>.
2406 =item %s never introduced
2408 (S internal) The symbol in question was declared but somehow went out of
2409 scope before it could possibly have been used.
2411 =item No %s allowed while running setuid
2413 (F) Certain operations are deemed to be too insecure for a setuid or
2414 setgid script to even be allowed to attempt. Generally speaking there
2415 will be another way to do what you want that is, if not secure, at least
2416 securable. See L<perlsec>.
2418 =item No comma allowed after %s
2420 (F) A list operator that has a filehandle or "indirect object" is not
2421 allowed to have a comma between that and the following arguments.
2422 Otherwise it'd be just another one of the arguments.
2424 One possible cause for this is that you expected to have imported a
2425 constant to your name space with B<use> or B<import> while no such
2426 importing took place, it may for example be that your operating system
2427 does not support that particular constant. Hopefully you did use an
2428 explicit import list for the constants you expect to see, please see
2429 L<perlfunc/use> and L<perlfunc/import>. While an explicit import list
2430 would probably have caught this error earlier it naturally does not
2431 remedy the fact that your operating system still does not support that
2432 constant. Maybe you have a typo in the constants of the symbol import
2433 list of B<use> or B<import> or in the constant name at the line where
2434 this error was triggered?
2436 =item No command into which to pipe on command line
2438 (F) An error peculiar to VMS. Perl handles its own command line
2439 redirection, and found a '|' at the end of the command line, so it
2440 doesn't know where you want to pipe the output from this command.
2442 =item No DB::DB routine defined
2444 (F) The currently executing code was compiled with the B<-d> switch, but
2445 for some reason the current debugger (e.g. F<perl5db.pl> or a C<Devel::>
2446 module) didn't define a routine to be called at the beginning of each
2449 =item No dbm on this machine
2451 (P) This is counted as an internal error, because every machine should
2452 supply dbm nowadays, because Perl comes with SDBM. See L<SDBM_File>.
2454 =item No DB::sub routine defined
2456 (F) The currently executing code was compiled with the B<-d> switch, but
2457 for some reason the current debugger (e.g. F<perl5db.pl> or a C<Devel::>
2458 module) didn't define a C<DB::sub> routine to be called at the beginning
2459 of each ordinary subroutine call.
2461 =item No B<-e> allowed in setuid scripts
2463 (F) A setuid script can't be specified by the user.
2465 =item No error file after 2> or 2>> on command line
2467 (F) An error peculiar to VMS. Perl handles its own command line
2468 redirection, and found a '2>' or a '2>>' on the command line, but can't
2469 find the name of the file to which to write data destined for stderr.
2471 =item No group ending character '%c' found in template
2473 (F) A pack or unpack template has an opening '(' or '[' without its
2474 matching counterpart. See L<perlfunc/pack>.
2476 =item No input file after < on command line
2478 (F) An error peculiar to VMS. Perl handles its own command line
2479 redirection, and found a '<' on the command line, but can't find the
2480 name of the file from which to read data for stdin.
2484 (F) The setuid emulator requires that scripts have a well-formed #! line
2485 even on machines that don't support the #! construct.
2487 =item "no" not allowed in expression
2489 (F) The "no" keyword is recognized and executed at compile time, and
2490 returns no useful value. See L<perlmod>.
2492 =item No output file after > on command line
2494 (F) An error peculiar to VMS. Perl handles its own command line
2495 redirection, and found a lone '>' at the end of the command line, so it
2496 doesn't know where you wanted to redirect stdout.
2498 =item No output file after > or >> on command line
2500 (F) An error peculiar to VMS. Perl handles its own command line
2501 redirection, and found a '>' or a '>>' on the command line, but can't
2502 find the name of the file to which to write data destined for stdout.
2504 =item No package name allowed for variable %s in "our"
2506 (F) Fully qualified variable names are not allowed in "our"
2507 declarations, because that doesn't make much sense under existing
2508 semantics. Such syntax is reserved for future extensions.
2510 =item No Perl script found in input
2512 (F) You called C<perl -x>, but no line was found in the file beginning
2513 with #! and containing the word "perl".
2515 =item No setregid available
2517 (F) Configure didn't find anything resembling the setregid() call for
2520 =item No setreuid available
2522 (F) Configure didn't find anything resembling the setreuid() call for
2525 =item No %s specified for -%c
2527 (F) The indicated command line switch needs a mandatory argument, but
2528 you haven't specified one.
2530 =item No such class field "%s" in variable %s of type %s
2532 (F) You tried to access a key from a hash through the indicated typed variable
2533 but that key is not allowed by the package of the same type. The indicated
2534 package has restricted the set of allowed keys using the L<fields> pragma.
2536 =item No such class %s
2538 (F) You provided a class qualifier in a "my" or "our" declaration, but
2539 this class doesn't exist at this point in your program.
2541 =item No such pipe open
2543 (P) An error peculiar to VMS. The internal routine my_pclose() tried to
2544 close a pipe which hadn't been opened. This should have been caught
2545 earlier as an attempt to close an unopened filehandle.
2547 =item No such signal: SIG%s
2549 (W signal) You specified a signal name as a subscript to %SIG that was
2550 not recognized. Say C<kill -l> in your shell to see the valid signal
2551 names on your system.
2553 =item Not a CODE reference
2555 (F) Perl was trying to evaluate a reference to a code value (that is, a
2556 subroutine), but found a reference to something else instead. You can
2557 use the ref() function to find out what kind of ref it really was. See
2560 =item Not a format reference
2562 (F) I'm not sure how you managed to generate a reference to an anonymous
2563 format, but this indicates you did, and that it didn't exist.
2565 =item Not a GLOB reference
2567 (F) Perl was trying to evaluate a reference to a "typeglob" (that is, a
2568 symbol table entry that looks like C<*foo>), but found a reference to
2569 something else instead. You can use the ref() function to find out what
2570 kind of ref it really was. See L<perlref>.
2572 =item Not a HASH reference
2574 (F) Perl was trying to evaluate a reference to a hash value, but found a
2575 reference to something else instead. You can use the ref() function to
2576 find out what kind of ref it really was. See L<perlref>.
2578 =item Not an ARRAY reference
2580 (F) Perl was trying to evaluate a reference to an array value, but found
2581 a reference to something else instead. You can use the ref() function
2582 to find out what kind of ref it really was. See L<perlref>.
2584 =item Not a perl script
2586 (F) The setuid emulator requires that scripts have a well-formed #! line
2587 even on machines that don't support the #! construct. The line must
2590 =item Not a SCALAR reference
2592 (F) Perl was trying to evaluate a reference to a scalar value, but found
2593 a reference to something else instead. You can use the ref() function
2594 to find out what kind of ref it really was. See L<perlref>.
2596 =item Not a subroutine reference
2598 (F) Perl was trying to evaluate a reference to a code value (that is, a
2599 subroutine), but found a reference to something else instead. You can
2600 use the ref() function to find out what kind of ref it really was. See
2603 =item Not a subroutine reference in overload table
2605 (F) An attempt was made to specify an entry in an overloading table that
2606 doesn't somehow point to a valid subroutine. See L<overload>.
2608 =item Not enough arguments for %s
2610 (F) The function requires more arguments than you specified.
2612 =item Not enough format arguments
2614 (W syntax) A format specified more picture fields than the next line
2615 supplied. See L<perlform>.
2619 (A) You've accidentally run your script through the Bourne shell instead
2620 of Perl. Check the #! line, or manually feed your script into Perl
2623 =item no UTC offset information; assuming local time is UTC
2625 (S) A warning peculiar to VMS. Perl was unable to find the local
2626 timezone offset, so it's assuming that local system time is equivalent
2627 to UTC. If it's not, define the logical name
2628 F<SYS$TIMEZONE_DIFFERENTIAL> to translate to the number of seconds which
2629 need to be added to UTC to get local time.
2631 =item Null filename used
2633 (F) You can't require the null filename, especially because on many
2634 machines that means the current directory! See L<perlfunc/require>.
2636 =item NULL OP IN RUN
2638 (P debugging) Some internal routine called run() with a null opcode
2641 =item Null picture in formline
2643 (F) The first argument to formline must be a valid format picture
2644 specification. It was found to be empty, which probably means you
2645 supplied it an uninitialized value. See L<perlform>.
2649 (P) An attempt was made to realloc NULL.
2651 =item NULL regexp argument
2653 (P) The internal pattern matching routines blew it big time.
2655 =item NULL regexp parameter
2657 (P) The internal pattern matching routines are out of their gourd.
2659 =item Number too long
2661 (F) Perl limits the representation of decimal numbers in programs to
2662 about 250 characters. You've exceeded that length. Future
2663 versions of Perl are likely to eliminate this arbitrary limitation. In
2664 the meantime, try using scientific notation (e.g. "1e6" instead of
2667 =item Octal number in vector unsupported
2669 (F) Numbers with a leading C<0> are not currently allowed in vectors.
2670 The octal number interpretation of such numbers may be supported in a
2673 =item Octal number > 037777777777 non-portable
2675 (W portable) The octal number you specified is larger than 2**32-1
2676 (4294967295) and therefore non-portable between systems. See
2677 L<perlport> for more on portability concerns.
2679 See also L<perlport> for writing portable code.
2681 =item Odd number of arguments for overload::constant
2683 (W overload) The call to overload::constant contained an odd number of
2684 arguments. The arguments should come in pairs.
2686 =item Odd number of elements in anonymous hash
2688 (W misc) You specified an odd number of elements to initialize a hash,
2689 which is odd, because hashes come in key/value pairs.
2691 =item Odd number of elements in hash assignment
2693 (W misc) You specified an odd number of elements to initialize a hash,
2694 which is odd, because hashes come in key/value pairs.
2696 =item Offset outside string
2698 (F) You tried to do a read/write/send/recv operation with an offset
2699 pointing outside the buffer. This is difficult to imagine. The sole
2700 exception to this is that C<sysread()>ing past the buffer will extend
2701 the buffer and zero pad the new area.
2703 =item %s() on unopened %s
2705 (W unopened) An I/O operation was attempted on a filehandle that was
2706 never initialized. You need to do an open(), a sysopen(), or a socket()
2707 call, or call a constructor from the FileHandle package.
2709 =item -%s on unopened filehandle %s
2711 (W unopened) You tried to invoke a file test operator on a filehandle
2712 that isn't open. Check your control flow. See also L<perlfunc/-X>.
2716 (S internal) An internal warning that the grammar is screwed up.
2720 (S internal) An internal warning that the grammar is screwed up.
2722 =item Operation "%s": no method found, %s
2724 (F) An attempt was made to perform an overloaded operation for which no
2725 handler was defined. While some handlers can be autogenerated in terms
2726 of other handlers, there is no default handler for any operation, unless
2727 C<fallback> overloading key is specified to be true. See L<overload>.
2729 =item Operator or semicolon missing before %s
2731 (S ambiguous) You used a variable or subroutine call where the parser
2732 was expecting an operator. The parser has assumed you really meant to
2733 use an operator, but this is highly likely to be incorrect. For
2734 example, if you say "*foo *foo" it will be interpreted as if you said
2737 =item "our" variable %s redeclared
2739 (W misc) You seem to have already declared the same global once before
2740 in the current lexical scope.
2742 =item Out of memory!
2744 (X) The malloc() function returned 0, indicating there was insufficient
2745 remaining memory (or virtual memory) to satisfy the request. Perl has
2746 no option but to exit immediately.
2748 At least in Unix you may be able to get past this by increasing your
2749 process datasize limits: in csh/tcsh use C<limit> and
2750 C<limit datasize n> (where C<n> is the number of kilobytes) to check
2751 the current limits and change them, and in ksh/bash/zsh use C<ulimit -a>
2752 and C<ulimit -d n>, respectively.
2754 =item Out of memory during %s extend
2756 (X) An attempt was made to extend an array, a list, or a string beyond
2757 the largest possible memory allocation.
2759 =item Out of memory during "large" request for %s
2761 (F) The malloc() function returned 0, indicating there was insufficient
2762 remaining memory (or virtual memory) to satisfy the request. However,
2763 the request was judged large enough (compile-time default is 64K), so a
2764 possibility to shut down by trapping this error is granted.
2766 =item Out of memory during request for %s
2768 (X|F) The malloc() function returned 0, indicating there was
2769 insufficient remaining memory (or virtual memory) to satisfy the
2772 The request was judged to be small, so the possibility to trap it
2773 depends on the way perl was compiled. By default it is not trappable.
2774 However, if compiled for this, Perl may use the contents of C<$^M> as an
2775 emergency pool after die()ing with this message. In this case the error
2776 is trappable I<once>, and the error message will include the line and file
2777 where the failed request happened.
2779 =item Out of memory during ridiculously large request
2781 (F) You can't allocate more than 2^31+"small amount" bytes. This error
2782 is most likely to be caused by a typo in the Perl program. e.g.,
2783 C<$arr[time]> instead of C<$arr[$time]>.
2785 =item Out of memory for yacc stack
2787 (F) The yacc parser wanted to grow its stack so it could continue
2788 parsing, but realloc() wouldn't give it more memory, virtual or
2791 =item '.' outside of string in pack
2793 (F) The argument to a '.' in your template tried to move the working
2794 position to before the start of the packed string being built.
2796 =item '@' outside of string in unpack
2798 (F) You had a template that specified an absolute position outside
2799 the string being unpacked. See L<perlfunc/pack>.
2801 =item '@' outside of string with malformed UTF-8 in unpack
2803 (F) You had a template that specified an absolute position outside
2804 the string being unpacked. The string being unpacked was also invalid
2805 UTF-8. See L<perlfunc/pack>.
2807 =item %s package attribute may clash with future reserved word: %s
2809 (W reserved) A lowercase attribute name was used that had a
2810 package-specific handler. That name might have a meaning to Perl itself
2811 some day, even though it doesn't yet. Perhaps you should use a
2812 mixed-case attribute name, instead. See L<attributes>.
2814 =item pack/unpack repeat count overflow
2816 (F) You can't specify a repeat count so large that it overflows your
2817 signed integers. See L<perlfunc/pack>.
2821 (W io) A single call to write() produced more lines than can fit on a
2822 page. See L<perlform>.
2826 (P) An internal error.
2828 =item panic: ck_grep
2830 (P) Failed an internal consistency check trying to compile a grep.
2832 =item panic: ck_split
2834 (P) Failed an internal consistency check trying to compile a split.
2836 =item panic: corrupt saved stack index
2838 (P) The savestack was requested to restore more localized values than
2839 there are in the savestack.
2841 =item panic: del_backref
2843 (P) Failed an internal consistency check while trying to reset a weak
2846 =item panic: Devel::DProf inconsistent subroutine return
2848 (P) Devel::DProf called a subroutine that exited using goto(LABEL),
2849 last(LABEL) or next(LABEL). Leaving that way a subroutine called from
2850 an XSUB will lead very probably to a crash of the interpreter. This is
2851 a bug that will hopefully one day get fixed.
2855 (P) We popped the context stack to an eval context, and then discovered
2856 it wasn't an eval context.
2858 =item panic: do_subst
2860 (P) The internal pp_subst() routine was called with invalid operational
2863 =item panic: do_trans_%s
2865 (P) The internal do_trans routines were called with invalid operational
2870 (P) The library function frexp() failed, making printf("%f") impossible.
2874 (P) We popped the context stack to a context with the specified label,
2875 and then discovered it wasn't a context we know how to do a goto in.
2877 =item panic: INTERPCASEMOD
2879 (P) The lexer got into a bad state at a case modifier.
2881 =item panic: INTERPCONCAT
2883 (P) The lexer got into a bad state parsing a string with brackets.
2885 =item panic: kid popen errno read
2887 (F) forked child returned an incomprehensible message about its errno.
2891 (P) We popped the context stack to a block context, and then discovered
2892 it wasn't a block context.
2894 =item panic: leave_scope clearsv
2896 (P) A writable lexical variable became read-only somehow within the
2899 =item panic: leave_scope inconsistency
2901 (P) The savestack probably got out of sync. At least, there was an
2902 invalid enum on the top of it.
2904 =item panic: magic_killbackrefs
2906 (P) Failed an internal consistency check while trying to reset all weak
2907 references to an object.
2911 (P) Something requested a negative number of bytes of malloc.
2913 =item panic: mapstart
2915 (P) The compiler is screwed up with respect to the map() function.
2917 =item panic: memory wrap
2919 (P) Something tried to allocate more memory than possible.
2921 =item panic: null array
2923 (P) One of the internal array routines was passed a null AV pointer.
2925 =item panic: pad_alloc
2927 (P) The compiler got confused about which scratch pad it was allocating
2928 and freeing temporaries and lexicals from.
2930 =item panic: pad_free curpad
2932 (P) The compiler got confused about which scratch pad it was allocating
2933 and freeing temporaries and lexicals from.
2935 =item panic: pad_free po
2937 (P) An invalid scratch pad offset was detected internally.
2939 =item panic: pad_reset curpad
2941 (P) The compiler got confused about which scratch pad it was allocating
2942 and freeing temporaries and lexicals from.
2944 =item panic: pad_sv po
2946 (P) An invalid scratch pad offset was detected internally.
2948 =item panic: pad_swipe curpad
2950 (P) The compiler got confused about which scratch pad it was allocating
2951 and freeing temporaries and lexicals from.
2953 =item panic: pad_swipe po
2955 (P) An invalid scratch pad offset was detected internally.
2957 =item panic: pp_iter
2959 (P) The foreach iterator got called in a non-loop context frame.
2961 =item panic: pp_match%s
2963 (P) The internal pp_match() routine was called with invalid operational
2966 =item panic: pp_split
2968 (P) Something terrible went wrong in setting up for the split.
2970 =item panic: realloc
2972 (P) Something requested a negative number of bytes of realloc.
2974 =item panic: restartop
2976 (P) Some internal routine requested a goto (or something like it), and
2977 didn't supply the destination.
2981 (P) We popped the context stack to a subroutine or eval context, and
2982 then discovered it wasn't a subroutine or eval context.
2984 =item panic: scan_num
2986 (P) scan_num() got called on something that wasn't a number.
2988 =item panic: sv_insert
2990 (P) The sv_insert() routine was told to remove more string than there
2993 =item panic: top_env
2995 (P) The compiler attempted to do a goto, or something weird like that.
2997 =item panic: utf16_to_utf8: odd bytelen
2999 (P) Something tried to call utf16_to_utf8 with an odd (as opposed
3000 to even) byte length.
3004 (P) The lexer got into a bad state while processing a case modifier.
3006 =item Parentheses missing around "%s" list
3008 (W parenthesis) You said something like
3014 my ($foo, $bar) = @_;
3016 Remember that "my", "our", and "local" bind tighter than comma.
3018 =item C<-p> destination: %s
3020 (F) An error occurred during the implicit output invoked by the C<-p>
3021 command-line switch. (This output goes to STDOUT unless you've
3022 redirected it with select().)
3024 =item (perhaps you forgot to load "%s"?)
3026 (F) This is an educated guess made in conjunction with the message
3027 "Can't locate object method \"%s\" via package \"%s\"". It often means
3028 that a method requires a package that has not been loaded.
3030 =item Perl_my_%s() not available
3032 (F) Your platform has very uncommon byte-order and integer size,
3033 so it was not possible to set up some or all fixed-width byte-order
3034 conversion functions. This is only a problem when you're using the
3035 '<' or '>' modifiers in (un)pack templates. See L<perlfunc/pack>.
3037 =item Perl %s required--this is only version %s, stopped
3039 (F) The module in question uses features of a version of Perl more
3040 recent than the currently running version. How long has it been since
3041 you upgraded, anyway? See L<perlfunc/require>.
3043 =item PERL_SH_DIR too long
3045 (F) An error peculiar to OS/2. PERL_SH_DIR is the directory to find the
3046 C<sh>-shell in. See "PERL_SH_DIR" in L<perlos2>.
3048 =item PERL_SIGNALS illegal: "%s"
3050 See L<perlrun/PERL_SIGNALS> for legal values.
3052 =item perl: warning: Setting locale failed.
3054 (S) The whole warning message will look something like:
3056 perl: warning: Setting locale failed.
3057 perl: warning: Please check that your locale settings:
3060 are supported and installed on your system.
3061 perl: warning: Falling back to the standard locale ("C").
3063 Exactly what were the failed locale settings varies. In the above the
3064 settings were that the LC_ALL was "En_US" and the LANG had no value.
3065 This error means that Perl detected that you and/or your operating
3066 system supplier and/or system administrator have set up the so-called
3067 locale system but Perl could not use those settings. This was not
3068 dead serious, fortunately: there is a "default locale" called "C" that
3069 Perl can and will use, the script will be run. Before you really fix
3070 the problem, however, you will get the same error message each time
3071 you run Perl. How to really fix the problem can be found in
3072 L<perllocale> section B<LOCALE PROBLEMS>.
3074 =item Permission denied
3076 (F) The setuid emulator in suidperl decided you were up to no good.
3078 =item pid %x not a child
3080 (W exec) A warning peculiar to VMS. Waitpid() was asked to wait for a
3081 process which isn't a subprocess of the current process. While this is
3082 fine from VMS' perspective, it's probably not what you intended.
3084 =item 'P' must have an explicit size in unpack
3086 (F) The unpack format P must have an explicit size, not "*".
3088 =item B<-P> not allowed for setuid/setgid script
3090 (F) The script would have to be opened by the C preprocessor by name,
3091 which provides a race condition that breaks security.
3093 =item POSIX class [:%s:] unknown in regex; marked by <-- HERE in m/%s/
3095 (F) The class in the character class [: :] syntax is unknown. The <-- HERE
3096 shows in the regular expression about where the problem was discovered.
3097 Note that the POSIX character classes do B<not> have the C<is> prefix
3098 the corresponding C interfaces have: in other words, it's C<[[:print:]]>,
3099 not C<isprint>. See L<perlre>.
3101 =item POSIX getpgrp can't take an argument
3103 (F) Your system has POSIX getpgrp(), which takes no argument, unlike
3104 the BSD version, which takes a pid.
3106 =item POSIX syntax [%s] belongs inside character classes in regex; marked by <-- HERE in m/%s/
3108 (W regexp) The character class constructs [: :], [= =], and [. .] go
3109 I<inside> character classes, the [] are part of the construct, for example:
3110 /[012[:alpha:]345]/. Note that [= =] and [. .] are not currently
3111 implemented; they are simply placeholders for future extensions and will
3112 cause fatal errors. The <-- HERE shows in the regular expression about
3113 where the problem was discovered. See L<perlre>.
3115 =item POSIX syntax [. .] is reserved for future extensions in regex; marked by <-- HERE in m/%s/
3117 (F regexp) Within regular expression character classes ([]) the syntax
3118 beginning with "[." and ending with ".]" is reserved for future extensions.
3119 If you need to represent those character sequences inside a regular
3120 expression character class, just quote the square brackets with the
3121 backslash: "\[." and ".\]". The <-- HERE shows in the regular expression
3122 about where the problem was discovered. See L<perlre>.
3124 =item POSIX syntax [= =] is reserved for future extensions in regex; marked by <-- HERE in m/%s/
3126 (F) Within regular expression character classes ([]) the syntax beginning
3127 with "[=" and ending with "=]" is reserved for future extensions. If you
3128 need to represent those character sequences inside a regular expression
3129 character class, just quote the square brackets with the backslash: "\[="
3130 and "=\]". The <-- HERE shows in the regular expression about where the
3131 problem was discovered. See L<perlre>.
3133 =item Possible attempt to put comments in qw() list
3135 (W qw) qw() lists contain items separated by whitespace; as with literal
3136 strings, comment characters are not ignored, but are instead treated as
3137 literal data. (You may have used different delimiters than the
3138 parentheses shown here; braces are also frequently used.)
3140 You probably wrote something like this:
3147 when you should have written this:
3154 If you really want comments, build your list the
3155 old-fashioned way, with quotes and commas:
3159 'b', # another comment
3162 =item Possible attempt to separate words with commas
3164 (W qw) qw() lists contain items separated by whitespace; therefore
3165 commas aren't needed to separate the items. (You may have used
3166 different delimiters than the parentheses shown here; braces are also
3169 You probably wrote something like this:
3173 which puts literal commas into some of the list items. Write it without
3174 commas if you don't want them to appear in your data:
3178 =item Possible memory corruption: %s overflowed 3rd argument
3180 (F) An ioctl() or fcntl() returned more than Perl was bargaining for.
3181 Perl guesses a reasonable buffer size, but puts a sentinel byte at the
3182 end of the buffer just in case. This sentinel byte got clobbered, and
3183 Perl assumes that memory is now corrupted. See L<perlfunc/ioctl>.
3185 =item Possible precedence problem on bitwise %c operator
3187 (W precedence) Your program uses a bitwise logical operator in conjunction
3188 with a numeric comparison operator, like this :
3190 if ($x & $y == 0) { ... }
3192 This expression is actually equivalent to C<$x & ($y == 0)>, due to the
3193 higher precedence of C<==>. This is probably not what you want. (If you
3194 really meant to write this, disable the warning, or, better, put the
3195 parentheses explicitly and write C<$x & ($y == 0)>).
3197 =item Possible unintended interpolation of %s in string
3199 (W ambiguous) You said something like `@foo' in a double-quoted string
3200 but there was no array C<@foo> in scope at the time. If you wanted a
3201 literal @foo, then write it as \@foo; otherwise find out what happened
3202 to the array you apparently lost track of.
3204 =item pragma "attrs" is deprecated, use "sub NAME : ATTRS" instead
3206 (D deprecated) You have written something like this:
3210 use attrs qw(locked);
3213 You should use the new declaration syntax instead.
3219 The C<use attrs> pragma is now obsolete, and is only provided for
3220 backward-compatibility. See L<perlsub/"Subroutine Attributes">.
3222 =item Precedence problem: open %s should be open(%s)
3224 (S precedence) The old irregular construct
3228 is now misinterpreted as
3232 because of the strict regularization of Perl 5's grammar into unary and
3233 list operators. (The old open was a little of both.) You must put
3234 parentheses around the filehandle, or use the new "or" operator instead
3237 =item Premature end of script headers
3241 =item printf() on closed filehandle %s
3243 (W closed) The filehandle you're writing to got itself closed sometime
3244 before now. Check your control flow.
3246 =item print() on closed filehandle %s
3248 (W closed) The filehandle you're printing on got itself closed sometime
3249 before now. Check your control flow.
3251 =item Process terminated by SIG%s
3253 (W) This is a standard message issued by OS/2 applications, while *nix
3254 applications die in silence. It is considered a feature of the OS/2
3255 port. One can easily disable this by appropriate sighandlers, see
3256 L<perlipc/"Signals">. See also "Process terminated by SIGTERM/SIGINT"
3259 =item Prototype mismatch: %s vs %s
3261 (S prototype) The subroutine being declared or defined had previously been
3262 declared or defined with a different function prototype.
3264 =item Prototype not terminated
3266 (F) You've omitted the closing parenthesis in a function prototype
3269 =item Quantifier follows nothing in regex; marked by <-- HERE in m/%s/
3271 (F) You started a regular expression with a quantifier. Backslash it if you
3272 meant it literally. The <-- HERE shows in the regular expression about
3273 where the problem was discovered. See L<perlre>.
3275 =item Quantifier in {,} bigger than %d in regex; marked by <-- HERE in m/%s/
3277 (F) There is currently a limit to the size of the min and max values of the
3278 {min,max} construct. The <-- HERE shows in the regular expression about where
3279 the problem was discovered. See L<perlre>.
3281 =item Quantifier unexpected on zero-length expression; marked by <-- HERE in m/%s/
3283 (W regexp) You applied a regular expression quantifier in a place where
3284 it makes no sense, such as on a zero-width assertion. Try putting the
3285 quantifier inside the assertion instead. For example, the way to match
3286 "abc" provided that it is followed by three repetitions of "xyz" is
3287 C</abc(?=(?:xyz){3})/>, not C</abc(?=xyz){3}/>.
3289 The <-- HERE shows in the regular expression about where the problem was
3292 =item Range iterator outside integer range
3294 (F) One (or both) of the numeric arguments to the range operator ".."
3295 are outside the range which can be represented by integers internally.
3296 One possible workaround is to force Perl to use magical string increment
3297 by prepending "0" to your numbers.
3299 =item readline() on closed filehandle %s
3301 (W closed) The filehandle you're reading from got itself closed sometime
3302 before now. Check your control flow.
3304 =item read() on closed filehandle %s
3306 (W closed) You tried to read from a closed filehandle.
3308 =item read() on unopened filehandle %s
3310 (W unopened) You tried to read from a filehandle that was never opened.
3312 =item Reallocation too large: %lx
3314 (F) You can't allocate more than 64K on an MS-DOS machine.
3316 =item realloc() of freed memory ignored
3318 (S malloc) An internal routine called realloc() on something that had
3321 =item Recompile perl with B<-D>DEBUGGING to use B<-D> switch
3323 (F debugging) You can't use the B<-D> option unless the code to produce
3324 the desired output is compiled into Perl, which entails some overhead,
3325 which is why it's currently left out of your copy.
3327 =item Recursive inheritance detected in package '%s'
3329 (F) More than 100 levels of inheritance were used. Probably indicates
3330 an unintended loop in your inheritance hierarchy.
3332 =item Recursive inheritance detected while looking for method %s
3334 (F) More than 100 levels of inheritance were encountered while invoking
3335 a method. Probably indicates an unintended loop in your inheritance
3338 =item Reference found where even-sized list expected
3340 (W misc) You gave a single reference where Perl was expecting a list
3341 with an even number of elements (for assignment to a hash). This usually
3342 means that you used the anon hash constructor when you meant to use
3343 parens. In any case, a hash requires key/value B<pairs>.
3345 %hash = { one => 1, two => 2, }; # WRONG
3346 %hash = [ qw/ an anon array / ]; # WRONG
3347 %hash = ( one => 1, two => 2, ); # right
3348 %hash = qw( one 1 two 2 ); # also fine
3350 =item Reference is already weak
3352 (W misc) You have attempted to weaken a reference that is already weak.
3353 Doing so has no effect.
3355 =item Reference miscount in sv_replace()
3357 (W internal) The internal sv_replace() function was handed a new SV with
3358 a reference count of other than 1.
3360 =item Reference to nonexistent group in regex; marked by <-- HERE in m/%s/
3362 (F) You used something like C<\7> in your regular expression, but there are
3363 not at least seven sets of capturing parentheses in the expression. If you
3364 wanted to have the character with value 7 inserted into the regular expression,
3365 prepend a zero to make the number at least two digits: C<\07>
3367 The <-- HERE shows in the regular expression about where the problem was
3370 =item regexp memory corruption
3372 (P) The regular expression engine got confused by what the regular
3373 expression compiler gave it.
3375 =item Regexp out of space
3377 (P) A "can't happen" error, because safemalloc() should have caught it
3380 =item Repeated format line will never terminate (~~ and @# incompatible)
3382 (F) Your format containes the ~~ repeat-until-blank sequence and a
3383 numeric field that will never go blank so that the repetition never
3384 terminates. You might use ^# instead. See L<perlform>.
3386 =item Reversed %s= operator
3388 (W syntax) You wrote your assignment operator backwards. The = must
3389 always comes last, to avoid ambiguity with subsequent unary operators.
3391 =item Runaway format
3393 (F) Your format contained the ~~ repeat-until-blank sequence, but it
3394 produced 200 lines at once, and the 200th line looked exactly like the
3395 199th line. Apparently you didn't arrange for the arguments to exhaust
3396 themselves, either by using ^ instead of @ (for scalar variables), or by
3397 shifting or popping (for array variables). See L<perlform>.
3399 =item Scalars leaked: %d
3401 (P) Something went wrong in Perl's internal bookkeeping of scalars:
3402 not all scalar variables were deallocated by the time Perl exited.
3403 What this usually indicates is a memory leak, which is of course bad,
3404 especially if the Perl program is intended to be long-running.
3406 =item Scalar value @%s[%s] better written as $%s[%s]
3408 (W syntax) You've used an array slice (indicated by @) to select a
3409 single element of an array. Generally it's better to ask for a scalar
3410 value (indicated by $). The difference is that C<$foo[&bar]> always
3411 behaves like a scalar, both when assigning to it and when evaluating its
3412 argument, while C<@foo[&bar]> behaves like a list when you assign to it,
3413 and provides a list context to its subscript, which can do weird things
3414 if you're expecting only one subscript.
3416 On the other hand, if you were actually hoping to treat the array
3417 element as a list, you need to look into how references work, because
3418 Perl will not magically convert between scalars and lists for you. See
3421 =item Scalar value @%s{%s} better written as $%s{%s}
3423 (W syntax) You've used a hash slice (indicated by @) to select a single
3424 element of a hash. Generally it's better to ask for a scalar value
3425 (indicated by $). The difference is that C<$foo{&bar}> always behaves
3426 like a scalar, both when assigning to it and when evaluating its
3427 argument, while C<@foo{&bar}> behaves like a list when you assign to it,
3428 and provides a list context to its subscript, which can do weird things
3429 if you're expecting only one subscript.
3431 On the other hand, if you were actually hoping to treat the hash element
3432 as a list, you need to look into how references work, because Perl will
3433 not magically convert between scalars and lists for you. See
3436 =item Script is not setuid/setgid in suidperl
3438 (F) Oddly, the suidperl program was invoked on a script without a setuid
3439 or setgid bit set. This doesn't make much sense.
3441 =item Search pattern not terminated
3443 (F) The lexer couldn't find the final delimiter of a // or m{}
3444 construct. Remember that bracketing delimiters count nesting level.
3445 Missing the leading C<$> from a variable C<$m> may cause this error.
3447 Note that since Perl 5.9.0 a // can also be the I<defined-or>
3448 construct, not just the empty search pattern. Therefore code written
3449 in Perl 5.9.0 or later that uses the // as the I<defined-or> can be
3450 misparsed by pre-5.9.0 Perls as a non-terminated search pattern.
3452 =item Search pattern not terminated or ternary operator parsed as search pattern
3454 (F) The lexer couldn't find the final delimiter of a C<?PATTERN?>
3457 The question mark is also used as part of the ternary operator (as in
3458 C<foo ? 0 : 1>) leading to some ambiguous constructions being wrongly
3459 parsed. One way to disambiguate the parsing is to put parentheses around
3460 the conditional expression, i.e. C<(foo) ? 0 : 1>.
3462 =item %sseek() on unopened filehandle
3464 (W unopened) You tried to use the seek() or sysseek() function on a
3465 filehandle that was either never opened or has since been closed.
3467 =item select not implemented
3469 (F) This machine doesn't implement the select() system call.
3471 =item Self-ties of arrays and hashes are not supported
3473 (F) Self-ties are of arrays and hashes are not supported in
3474 the current implementation.
3476 =item Semicolon seems to be missing
3478 (W semicolon) A nearby syntax error was probably caused by a missing
3479 semicolon, or possibly some other missing operator, such as a comma.
3481 =item semi-panic: attempt to dup freed string
3483 (S internal) The internal newSVsv() routine was called to duplicate a
3484 scalar that had previously been marked as free.
3486 =item sem%s not implemented
3488 (F) You don't have System V semaphore IPC on your system.
3490 =item send() on closed socket %s
3492 (W closed) The socket you're sending to got itself closed sometime
3493 before now. Check your control flow.
3495 =item Sequence (? incomplete in regex; marked by <-- HERE in m/%s/
3497 (F) A regular expression ended with an incomplete extension (?. The <-- HERE
3498 shows in the regular expression about where the problem was discovered. See
3501 =item Sequence (?%s...) not implemented in regex; marked by <-- HERE in m/%s/
3503 (F) A proposed regular expression extension has the character reserved but
3504 has not yet been written. The <-- HERE shows in the regular expression about
3505 where the problem was discovered. See L<perlre>.
3507 =item Sequence (?%s...) not recognized in regex; marked by <-- HERE in m/%s/
3509 (F) You used a regular expression extension that doesn't make sense. The
3510 <-- HERE shows in the regular expression about where the problem was
3511 discovered. See L<perlre>.
3513 =item Sequence (?#... not terminated in regex; marked by <-- HERE in m/%s/
3515 (F) A regular expression comment must be terminated by a closing
3516 parenthesis. Embedded parentheses aren't allowed. The <-- HERE shows in
3517 the regular expression about where the problem was discovered. See
3520 =item Sequence (?{...}) not terminated or not {}-balanced in regex; marked by <-- HERE in m/%s/
3522 (F) If the contents of a (?{...}) clause contains braces, they must balance
3523 for Perl to properly detect the end of the clause. The <-- HERE shows in
3524 the regular expression about where the problem was discovered. See
3527 =item 500 Server error
3533 This is the error message generally seen in a browser window when trying
3534 to run a CGI program (including SSI) over the web. The actual error text
3535 varies widely from server to server. The most frequently-seen variants
3536 are "500 Server error", "Method (something) not permitted", "Document
3537 contains no data", "Premature end of script headers", and "Did not
3538 produce a valid header".
3540 B<This is a CGI error, not a Perl error>.
3542 You need to make sure your script is executable, is accessible by the
3543 user CGI is running the script under (which is probably not the user
3544 account you tested it under), does not rely on any environment variables
3545 (like PATH) from the user it isn't running under, and isn't in a
3546 location where the CGI server can't find it, basically, more or less.
3547 Please see the following for more information:
3549 http://www.perl.org/CGI_MetaFAQ.html
3550 http://www.htmlhelp.org/faq/cgifaq.html
3551 http://www.w3.org/Security/Faq/
3553 You should also look at L<perlfaq9>.
3555 =item setegid() not implemented
3557 (F) You tried to assign to C<$)>, and your operating system doesn't
3558 support the setegid() system call (or equivalent), or at least Configure
3561 =item seteuid() not implemented
3563 (F) You tried to assign to C<< $> >>, and your operating system doesn't
3564 support the seteuid() system call (or equivalent), or at least Configure
3567 =item setpgrp can't take arguments
3569 (F) Your system has the setpgrp() from BSD 4.2, which takes no
3570 arguments, unlike POSIX setpgid(), which takes a process ID and process
3573 =item setrgid() not implemented
3575 (F) You tried to assign to C<$(>, and your operating system doesn't
3576 support the setrgid() system call (or equivalent), or at least Configure
3579 =item setruid() not implemented
3581 (F) You tried to assign to C<$<>, and your operating system doesn't
3582 support the setruid() system call (or equivalent), or at least Configure
3585 =item setsockopt() on closed socket %s
3587 (W closed) You tried to set a socket option on a closed socket. Did you
3588 forget to check the return value of your socket() call? See
3589 L<perlfunc/setsockopt>.
3591 =item Setuid/gid script is writable by world
3593 (F) The setuid emulator won't run a script that is writable by the
3594 world, because the world might have written on it already.
3596 =item Setuid script not plain file
3598 (F) The setuid emulator won't run a script that isn't read from a file,
3599 but from a socket, a pipe or another device.
3601 =item shm%s not implemented
3603 (F) You don't have System V shared memory IPC on your system.
3605 =item !=~ should be !~
3607 (W syntax) The non-matching operator is !~, not !=~. !=~ will be
3608 interpreted as the != (numeric not equal) and ~ (1's complement)
3609 operators: probably not what you intended.
3611 =item <> should be quotes
3613 (F) You wrote C<< require <file> >> when you should have written
3616 =item /%s/ should probably be written as "%s"
3618 (W syntax) You have used a pattern where Perl expected to find a string,
3619 as in the first argument to C<join>. Perl will treat the true or false
3620 result of matching the pattern against $_ as the string, which is
3621 probably not what you had in mind.
3623 =item shutdown() on closed socket %s
3625 (W closed) You tried to do a shutdown on a closed socket. Seems a bit
3628 =item SIG%s handler "%s" not defined
3630 (W signal) The signal handler named in %SIG doesn't, in fact, exist.
3631 Perhaps you put it into the wrong package?
3633 =item sort is now a reserved word
3635 (F) An ancient error message that almost nobody ever runs into anymore.
3636 But before sort was a keyword, people sometimes used it as a filehandle.
3638 =item Sort subroutine didn't return a numeric value
3640 (F) A sort comparison routine must return a number. You probably blew
3641 it by not using C<< <=> >> or C<cmp>, or by not using them correctly.
3642 See L<perlfunc/sort>.
3644 =item Sort subroutine didn't return single value
3646 (F) A sort comparison subroutine may not return a list value with more
3647 or less than one element. See L<perlfunc/sort>.
3649 =item splice() offset past end of array
3651 (W misc) You attempted to specify an offset that was past the end of
3652 the array passed to splice(). Splicing will instead commence at the end
3653 of the array, rather than past it. If this isn't what you want, try
3654 explicitly pre-extending the array by assigning $#array = $offset. See
3659 (P) The split was looping infinitely. (Obviously, a split shouldn't
3660 iterate more times than there are characters of input, which is what
3661 happened.) See L<perlfunc/split>.
3663 =item Statement unlikely to be reached
3665 (W exec) You did an exec() with some statement after it other than a
3666 die(). This is almost always an error, because exec() never returns
3667 unless there was a failure. You probably wanted to use system()
3668 instead, which does return. To suppress this warning, put the exec() in
3671 =item stat() on unopened filehandle %s
3673 (W unopened) You tried to use the stat() function on a filehandle that
3674 was either never opened or has since been closed.
3676 =item Stub found while resolving method "%s" overloading "%s"
3678 (P) Overloading resolution over @ISA tree may be broken by importation
3679 stubs. Stubs should never be implicitly created, but explicit calls to
3680 C<can> may break this.
3682 =item Subroutine %s redefined
3684 (W redefine) You redefined a subroutine. To suppress this warning, say
3687 no warnings 'redefine';
3688 eval "sub name { ... }";
3691 =item Substitution loop
3693 (P) The substitution was looping infinitely. (Obviously, a substitution
3694 shouldn't iterate more times than there are characters of input, which
3695 is what happened.) See the discussion of substitution in
3696 L<perlop/"Quote and Quote-like Operators">.
3698 =item Substitution pattern not terminated
3700 (F) The lexer couldn't find the interior delimiter of an s/// or s{}{}
3701 construct. Remember that bracketing delimiters count nesting level.
3702 Missing the leading C<$> from variable C<$s> may cause this error.
3704 =item Substitution replacement not terminated
3706 (F) The lexer couldn't find the final delimiter of an s/// or s{}{}
3707 construct. Remember that bracketing delimiters count nesting level.
3708 Missing the leading C<$> from variable C<$s> may cause this error.
3710 =item substr outside of string
3712 (W substr),(F) You tried to reference a substr() that pointed outside of
3713 a string. That is, the absolute value of the offset was larger than the
3714 length of the string. See L<perlfunc/substr>. This warning is fatal if
3715 substr is used in an lvalue context (as the left hand side of an
3716 assignment or as a subroutine argument for example).
3718 =item suidperl is no longer needed since %s
3720 (F) Your Perl was compiled with B<-D>SETUID_SCRIPTS_ARE_SECURE_NOW, but
3721 a version of the setuid emulator somehow got run anyway.
3723 =item sv_upgrade from type %d down to type %d
3725 (P) Perl tried to force the upgrade an SV to a type which was actually
3726 inferior to its current type.
3728 =item Switch (?(condition)... contains too many branches in regex; marked by <-- HERE in m/%s/
3730 (F) A (?(condition)if-clause|else-clause) construct can have at most two
3731 branches (the if-clause and the else-clause). If you want one or both to
3732 contain alternation, such as using C<this|that|other>, enclose it in
3733 clustering parentheses:
3735 (?(condition)(?:this|that|other)|else-clause)
3737 The <-- HERE shows in the regular expression about where the problem was
3738 discovered. See L<perlre>.
3740 =item Switch condition not recognized in regex; marked by <-- HERE in m/%s/
3742 (F) If the argument to the (?(...)if-clause|else-clause) construct is a
3743 number, it can be only a number. The <-- HERE shows in the regular expression
3744 about where the problem was discovered. See L<perlre>.
3746 =item switching effective %s is not implemented
3748 (F) While under the C<use filetest> pragma, we cannot switch the real
3749 and effective uids or gids.
3753 (F) The final summary message when a C<perl -c> succeeds.
3757 (F) Probably means you had a syntax error. Common reasons include:
3759 A keyword is misspelled.
3760 A semicolon is missing.
3762 An opening or closing parenthesis is missing.
3763 An opening or closing brace is missing.
3764 A closing quote is missing.
3766 Often there will be another error message associated with the syntax
3767 error giving more information. (Sometimes it helps to turn on B<-w>.)
3768 The error message itself often tells you where it was in the line when
3769 it decided to give up. Sometimes the actual error is several tokens
3770 before this, because Perl is good at understanding random input.
3771 Occasionally the line number may be misleading, and once in a blue moon
3772 the only way to figure out what's triggering the error is to call
3773 C<perl -c> repeatedly, chopping away half the program each time to see
3774 if the error went away. Sort of the cybernetic version of S<20
3777 =item syntax error at line %d: `%s' unexpected
3779 (A) You've accidentally run your script through the Bourne shell instead
3780 of Perl. Check the #! line, or manually feed your script into Perl
3783 =item syntax error in file %s at line %d, next 2 tokens "%s"
3785 (F) This error is likely to occur if you run a perl5 script through
3786 a perl4 interpreter, especially if the next 2 tokens are "use strict"
3787 or "my $var" or "our $var".
3789 =item sysread() on closed filehandle %s
3791 (W closed) You tried to read from a closed filehandle.
3793 =item sysread() on unopened filehandle %s
3795 (W unopened) You tried to read from a filehandle that was never opened.
3797 =item System V %s is not implemented on this machine
3799 (F) You tried to do something with a function beginning with "sem",
3800 "shm", or "msg" but that System V IPC is not implemented in your
3801 machine. In some machines the functionality can exist but be
3802 unconfigured. Consult your system support.
3804 =item syswrite() on closed filehandle %s
3806 (W closed) The filehandle you're writing to got itself closed sometime
3807 before now. Check your control flow.
3809 =item C<-T> and C<-B> not implemented on filehandles
3811 (F) Perl can't peek at the stdio buffer of filehandles when it doesn't
3812 know about your kind of stdio. You'll have to use a filename instead.
3814 =item Target of goto is too deeply nested
3816 (F) You tried to use C<goto> to reach a label that was too deeply nested
3817 for Perl to reach. Perl is doing you a favor by refusing.
3819 =item tell() on unopened filehandle
3821 (W unopened) You tried to use the tell() function on a filehandle that
3822 was either never opened or has since been closed.
3824 =item That use of $[ is unsupported
3826 (F) Assignment to C<$[> is now strictly circumscribed, and interpreted
3827 as a compiler directive. You may say only one of
3836 This is to prevent the problem of one module changing the array base out
3837 from under another module inadvertently. See L<perlvar/$[>.
3839 =item The crypt() function is unimplemented due to excessive paranoia
3841 (F) Configure couldn't find the crypt() function on your machine,
3842 probably because your vendor didn't supply it, probably because they
3843 think the U.S. Government thinks it's a secret, or at least that they
3844 will continue to pretend that it is. And if you quote me on that, I
3847 =item The %s function is unimplemented
3849 The function indicated isn't implemented on this architecture, according
3850 to the probings of Configure.
3852 =item The stat preceding %s wasn't an lstat
3854 (F) It makes no sense to test the current stat buffer for symbolic
3855 linkhood if the last stat that wrote to the stat buffer already went
3856 past the symlink to get to the real file. Use an actual filename
3859 =item The 'unique' attribute may only be applied to 'our' variables
3861 (F) Currently this attribute is not supported on C<my> or C<sub>
3862 declarations. See L<perlfunc/our>.
3864 =item This Perl can't reset CRTL environ elements (%s)
3866 =item This Perl can't set CRTL environ elements (%s=%s)
3868 (W internal) Warnings peculiar to VMS. You tried to change or delete an
3869 element of the CRTL's internal environ array, but your copy of Perl
3870 wasn't built with a CRTL that contained the setenv() function. You'll
3871 need to rebuild Perl with a CRTL that does, or redefine
3872 F<PERL_ENV_TABLES> (see L<perlvms>) so that the environ array isn't the
3873 target of the change to
3874 %ENV which produced the warning.
3876 =item thread failed to start: %s
3878 (F) The entry point function of threads->create() failed for some reason.
3880 =item times not implemented
3882 (F) Your version of the C library apparently doesn't do times(). I
3883 suspect you're not running on Unix.
3885 =item "-T" is on the #! line, it must also be used on the command line
3887 (X) The #! line (or local equivalent) in a Perl script contains the
3888 B<-T> option, but Perl was not invoked with B<-T> in its command line.
3889 This is an error because, by the time Perl discovers a B<-T> in a
3890 script, it's too late to properly taint everything from the environment.
3893 If the Perl script is being executed as a command using the #!
3894 mechanism (or its local equivalent), this error can usually be fixed by
3895 editing the #! line so that the B<-T> option is a part of Perl's first
3896 argument: e.g. change C<perl -n -T> to C<perl -T -n>.
3898 If the Perl script is being executed as C<perl scriptname>, then the
3899 B<-T> option must appear on the command line: C<perl -T scriptname>.
3901 =item To%s: illegal mapping '%s'
3903 (F) You tried to define a customized To-mapping for lc(), lcfirst,
3904 uc(), or ucfirst() (or their string-inlined versions), but you
3905 specified an illegal mapping.
3906 See L<perlunicode/"User-Defined Character Properties">.
3908 =item Too deeply nested ()-groups
3910 (F) Your template contains ()-groups with a ridiculously deep nesting level.
3912 =item Too few args to syscall
3914 (F) There has to be at least one argument to syscall() to specify the
3915 system call to call, silly dilly.
3917 =item Too late for "-%s" option
3919 (X) The #! line (or local equivalent) in a Perl script contains the
3920 B<-M>, B<-m> or B<-C> option. This is an error because those options
3921 are not intended for use inside scripts. Use the C<use> pragma instead.
3923 =item Too late to run %s block
3925 (W void) A CHECK or INIT block is being defined during run time proper,
3926 when the opportunity to run them has already passed. Perhaps you are
3927 loading a file with C<require> or C<do> when you should be using C<use>
3928 instead. Or perhaps you should put the C<require> or C<do> inside a
3931 =item Too many args to syscall
3933 (F) Perl supports a maximum of only 14 args to syscall().
3935 =item Too many arguments for %s
3937 (F) The function requires fewer arguments than you specified.
3941 (A) You've accidentally run your script through B<csh> instead of Perl.
3942 Check the #! line, or manually feed your script into Perl yourself.
3946 (A) You've accidentally run your script through B<csh> instead of Perl.
3947 Check the #! line, or manually feed your script into Perl yourself.
3949 =item Trailing \ in regex m/%s/
3951 (F) The regular expression ends with an unbackslashed backslash.
3952 Backslash it. See L<perlre>.
3954 =item Transliteration pattern not terminated
3956 (F) The lexer couldn't find the interior delimiter of a tr/// or tr[][]
3957 or y/// or y[][] construct. Missing the leading C<$> from variables
3958 C<$tr> or C<$y> may cause this error.
3960 =item Transliteration replacement not terminated
3962 (F) The lexer couldn't find the final delimiter of a tr///, tr[][],
3963 y/// or y[][] construct.
3965 =item '%s' trapped by operation mask
3967 (F) You tried to use an operator from a Safe compartment in which it's
3968 disallowed. See L<Safe>.
3970 =item truncate not implemented
3972 (F) Your machine doesn't implement a file truncation mechanism that
3973 Configure knows about.
3975 =item Type of arg %d to %s must be %s (not %s)
3977 (F) This function requires the argument in that position to be of a
3978 certain type. Arrays must be @NAME or C<@{EXPR}>. Hashes must be
3979 %NAME or C<%{EXPR}>. No implicit dereferencing is allowed--use the
3980 {EXPR} forms as an explicit dereference. See L<perlref>.
3982 =item umask not implemented
3984 (F) Your machine doesn't implement the umask function and you tried to
3985 use it to restrict permissions for yourself (EXPR & 0700).
3987 =item Unable to create sub named "%s"
3989 (F) You attempted to create or access a subroutine with an illegal name.
3991 =item Unbalanced context: %d more PUSHes than POPs
3993 (W internal) The exit code detected an internal inconsistency in how
3994 many execution contexts were entered and left.
3996 =item Unbalanced saves: %d more saves than restores
3998 (W internal) The exit code detected an internal inconsistency in how
3999 many values were temporarily localized.
4001 =item Unbalanced scopes: %d more ENTERs than LEAVEs
4003 (W internal) The exit code detected an internal inconsistency in how
4004 many blocks were entered and left.
4006 =item Unbalanced tmps: %d more allocs than frees
4008 (W internal) The exit code detected an internal inconsistency in how
4009 many mortal scalars were allocated and freed.
4011 =item Undefined format "%s" called
4013 (F) The format indicated doesn't seem to exist. Perhaps it's really in
4014 another package? See L<perlform>.
4016 =item Undefined sort subroutine "%s" called
4018 (F) The sort comparison routine specified doesn't seem to exist.
4019 Perhaps it's in a different package? See L<perlfunc/sort>.
4021 =item Undefined subroutine &%s called
4023 (F) The subroutine indicated hasn't been defined, or if it was, it has
4024 since been undefined.
4026 =item Undefined subroutine called
4028 (F) The anonymous subroutine you're trying to call hasn't been defined,
4029 or if it was, it has since been undefined.
4031 =item Undefined subroutine in sort
4033 (F) The sort comparison routine specified is declared but doesn't seem
4034 to have been defined yet. See L<perlfunc/sort>.
4036 =item Undefined top format "%s" called
4038 (F) The format indicated doesn't seem to exist. Perhaps it's really in
4039 another package? See L<perlform>.
4041 =item Undefined value assigned to typeglob
4043 (W misc) An undefined value was assigned to a typeglob, a la
4044 C<*foo = undef>. This does nothing. It's possible that you really mean
4047 =item %s: Undefined variable
4049 (A) You've accidentally run your script through B<csh> instead of Perl.
4050 Check the #! line, or manually feed your script into Perl yourself.
4052 =item unexec of %s into %s failed!
4054 (F) The unexec() routine failed for some reason. See your local FSF
4055 representative, who probably put it there in the first place.
4057 =item Unicode character %s is illegal
4059 (W utf8) Certain Unicode characters have been designated off-limits by
4060 the Unicode standard and should not be generated. If you really know
4061 what you are doing you can turn off this warning by C<no warnings 'utf8';>.
4063 =item Unknown BYTEORDER
4065 (F) There are no byte-swapping functions for a machine with this byte
4068 =item Unknown open() mode '%s'
4070 (F) The second argument of 3-argument open() is not among the list
4071 of valid modes: C<< < >>, C<< > >>, C<<< >> >>>, C<< +< >>,
4072 C<< +> >>, C<<< +>> >>>, C<-|>, C<|->, C<< <& >>, C<< >& >>.
4074 =item Unknown PerlIO layer "%s"
4076 (W layer) An attempt was made to push an unknown layer onto the Perl I/O
4077 system. (Layers take care of transforming data between external and
4078 internal representations.) Note that some layers, such as C<mmap>,
4079 are not supported in all environments. If your program didn't
4080 explicitly request the failing operation, it may be the result of the
4081 value of the environment variable PERLIO.
4083 =item Unknown process %x sent message to prime_env_iter: %s
4085 (P) An error peculiar to VMS. Perl was reading values for %ENV before
4086 iterating over it, and someone else stuck a message in the stream of
4087 data Perl expected. Someone's very confused, or perhaps trying to
4088 subvert Perl's population of %ENV for nefarious purposes.
4090 =item Unknown "re" subpragma '%s' (known ones are: %s)
4092 You tried to use an unknown subpragma of the "re" pragma.
4094 =item Unknown switch condition (?(%.2s in regex; marked by <-- HERE in m/%s/
4096 (F) The condition part of a (?(condition)if-clause|else-clause) construct
4097 is not known. The condition may be lookahead or lookbehind (the condition
4098 is true if the lookahead or lookbehind is true), a (?{...}) construct (the
4099 condition is true if the code evaluates to a true value), or a number (the
4100 condition is true if the set of capturing parentheses named by the number
4103 The <-- HERE shows in the regular expression about where the problem was
4104 discovered. See L<perlre>.
4106 =item Unknown Unicode option letter '%c'
4108 You specified an unknown Unicode option. See L<perlrun> documentation
4109 of the C<-C> switch for the list of known options.
4111 =item Unknown Unicode option value %x
4113 You specified an unknown Unicode option. See L<perlrun> documentation
4114 of the C<-C> switch for the list of known options.
4116 =item Unknown warnings category '%s'
4118 (F) An error issued by the C<warnings> pragma. You specified a warnings
4119 category that is unknown to perl at this point.
4121 Note that if you want to enable a warnings category registered by a module
4122 (e.g. C<use warnings 'File::Find'>), you must have imported this module
4125 =item unmatched [ in regex; marked by <-- HERE in m/%s/
4127 (F) The brackets around a character class must match. If you wish to
4128 include a closing bracket in a character class, backslash it or put it
4129 first. The <-- HERE shows in the regular expression about where the problem
4130 was discovered. See L<perlre>.
4132 =item unmatched ( in regex; marked by <-- HERE in m/%s/
4134 (F) Unbackslashed parentheses must always be balanced in regular
4135 expressions. If you're a vi user, the % key is valuable for finding the
4136 matching parenthesis. The <-- HERE shows in the regular expression about
4137 where the problem was discovered. See L<perlre>.
4139 =item Unmatched right %s bracket
4141 (F) The lexer counted more closing curly or square brackets than opening
4142 ones, so you're probably missing a matching opening bracket. As a
4143 general rule, you'll find the missing one (so to speak) near the place
4144 you were last editing.
4146 =item Unquoted string "%s" may clash with future reserved word
4148 (W reserved) You used a bareword that might someday be claimed as a
4149 reserved word. It's best to put such a word in quotes, or capitalize it
4150 somehow, or insert an underbar into it. You might also declare it as a
4153 =item Unrecognized character %s
4155 (F) The Perl parser has no idea what to do with the specified character
4156 in your Perl script (or eval). Perhaps you tried to run a compressed
4157 script, a binary program, or a directory as a Perl program.
4159 =item /%s/: Unrecognized escape \\%c in character class passed through
4161 (W regexp) You used a backslash-character combination which is not
4162 recognized by Perl inside character classes. The character was
4163 understood literally.
4165 =item Unrecognized escape \\%c passed through
4167 (W misc) You used a backslash-character combination which is not
4170 =item Unrecognized escape \\%c passed through in regex; marked by <-- HERE in m/%s/
4172 (W regexp) You used a backslash-character combination which is not
4173 recognized by Perl. This combination appears in an interpolated variable or
4174 a C<'>-delimited regular expression. The character was understood
4175 literally. The <-- HERE shows in the regular expression about where the
4176 escape was discovered.
4178 =item Unrecognized signal name "%s"
4180 (F) You specified a signal name to the kill() function that was not
4181 recognized. Say C<kill -l> in your shell to see the valid signal names
4184 =item Unrecognized switch: -%s (-h will show valid options)
4186 (F) You specified an illegal option to Perl. Don't do that. (If you
4187 think you didn't do that, check the #! line to see if it's supplying the
4188 bad switch on your behalf.)
4190 =item Unsuccessful %s on filename containing newline
4192 (W newline) A file operation was attempted on a filename, and that
4193 operation failed, PROBABLY because the filename contained a newline,
4194 PROBABLY because you forgot to chomp() it off. See L<perlfunc/chomp>.
4196 =item Unsupported directory function "%s" called
4198 (F) Your machine doesn't support opendir() and readdir().
4200 =item Unsupported function %s
4202 (F) This machine doesn't implement the indicated function, apparently.
4203 At least, Configure doesn't think so.
4205 =item Unsupported function fork
4207 (F) Your version of executable does not support forking.
4209 Note that under some systems, like OS/2, there may be different flavors
4210 of Perl executables, some of which may support fork, some not. Try
4211 changing the name you call Perl by to C<perl_>, C<perl__>, and so on.
4213 =item Unsupported script encoding %s
4215 (F) Your program file begins with a Unicode Byte Order Mark (BOM) which
4216 declares it to be in a Unicode encoding that Perl cannot read.
4218 =item Unsupported socket function "%s" called
4220 (F) Your machine doesn't support the Berkeley socket mechanism, or at
4221 least that's what Configure thought.
4223 =item Unterminated attribute list
4225 (F) The lexer found something other than a simple identifier at the
4226 start of an attribute, and it wasn't a semicolon or the start of a
4227 block. Perhaps you terminated the parameter list of the previous
4228 attribute too soon. See L<attributes>.
4230 =item Unterminated attribute parameter in attribute list
4232 (F) The lexer saw an opening (left) parenthesis character while parsing
4233 an attribute list, but the matching closing (right) parenthesis
4234 character was not found. You may need to add (or remove) a backslash
4235 character to get your parentheses to balance. See L<attributes>.
4237 =item Unterminated compressed integer
4239 (F) An argument to unpack("w",...) was incompatible with the BER
4240 compressed integer format and could not be converted to an integer.
4241 See L<perlfunc/pack>.
4243 =item Unterminated <> operator
4245 (F) The lexer saw a left angle bracket in a place where it was expecting
4246 a term, so it's looking for the corresponding right angle bracket, and
4247 not finding it. Chances are you left some needed parentheses out
4248 earlier in the line, and you really meant a "less than".
4250 =item untie attempted while %d inner references still exist
4252 (W untie) A copy of the object returned from C<tie> (or C<tied>) was
4253 still valid when C<untie> was called.
4255 =item Usage: POSIX::%s(%s)
4257 (F) You called a POSIX function with incorrect arguments.
4258 See L<POSIX/FUNCTIONS> for more information.
4260 =item Usage: Win32::%s(%s)
4262 (F) You called a Win32 function with incorrect arguments.
4263 See L<Win32> for more information.
4265 =item Useless (?-%s) - don't use /%s modifier in regex; marked by <-- HERE in m/%s/
4267 (W regexp) You have used an internal modifier such as (?-o) that has no
4268 meaning unless removed from the entire regexp:
4270 if ($string =~ /(?-o)$pattern/o) { ... }
4274 if ($string =~ /$pattern/) { ... }
4276 The <-- HERE shows in the regular expression about
4277 where the problem was discovered. See L<perlre>.
4279 =item Useless localization of %s
4281 (W syntax) The localization of lvalues such as C<local($x=10)> is
4282 legal, but in fact the local() currently has no effect. This may change at
4283 some point in the future, but in the meantime such code is discouraged.
4285 =item Useless (?%s) - use /%s modifier in regex; marked by <-- HERE in m/%s/
4287 (W regexp) You have used an internal modifier such as (?o) that has no
4288 meaning unless applied to the entire regexp:
4290 if ($string =~ /(?o)$pattern/) { ... }
4294 if ($string =~ /$pattern/o) { ... }
4296 The <-- HERE shows in the regular expression about
4297 where the problem was discovered. See L<perlre>.
4299 =item Useless use of %s in void context
4301 (W void) You did something without a side effect in a context that does
4302 nothing with the return value, such as a statement that doesn't return a
4303 value from a block, or the left side of a scalar comma operator. Very
4304 often this points not to stupidity on your part, but a failure of Perl
4305 to parse your program the way you thought it would. For example, you'd
4306 get this if you mixed up your C precedence with Python precedence and
4311 when you meant to say
4313 ($one, $two) = (1, 2);
4315 Another common error is to use ordinary parentheses to construct a list
4316 reference when you should be using square or curly brackets, for
4321 when you should have said
4325 The square brackets explicitly turn a list value into a scalar value,
4326 while parentheses do not. So when a parenthesized list is evaluated in
4327 a scalar context, the comma is treated like C's comma operator, which
4328 throws away the left argument, which is not what you want. See
4329 L<perlref> for more on this.
4331 This warning will not be issued for numerical constants equal to 0 or 1
4332 since they are often used in statements like
4334 1 while sub_with_side_effects() ;
4336 String constants that would normally evaluate to 0 or 1 are warned
4339 =item Useless use of "re" pragma
4341 (W) You did C<use re;> without any arguments. That isn't very useful.
4343 =item Useless use of sort in scalar context
4345 (W void) You used sort in scalar context, as in :
4349 This is not very useful, and perl currently optimizes this away.
4351 =item Useless use of %s with no values
4353 (W syntax) You used the push() or unshift() function with no arguments
4354 apart from the array, like C<push(@x)> or C<unshift(@foo)>. That won't
4355 usually have any effect on the array, so is completely useless. It's
4356 possible in principle that push(@tied_array) could have some effect
4357 if the array is tied to a class which implements a PUSH method. If so,
4358 you can write it as C<push(@tied_array,())> to avoid this warning.
4360 =item "use" not allowed in expression
4362 (F) The "use" keyword is recognized and executed at compile time, and
4363 returns no useful value. See L<perlmod>.
4365 =item Use of bare << to mean <<"" is deprecated
4367 (D deprecated) You are now encouraged to use the explicitly quoted form
4368 if you wish to use an empty line as the terminator of the here-document.
4370 =item Use of chdir('') or chdir(undef) as chdir() deprecated
4372 (D deprecated) chdir() with no arguments is documented to change to
4373 $ENV{HOME} or $ENV{LOGDIR}. chdir(undef) and chdir('') share this
4374 behavior, but that has been deprecated. In future versions they
4377 Be careful to check that what you pass to chdir() is defined and not
4378 blank, else you might find yourself in your home directory.
4380 =item Use of /c modifier is meaningless in s///
4382 (W regexp) You used the /c modifier in a substitution. The /c
4383 modifier is not presently meaningful in substitutions.
4385 =item Use of /c modifier is meaningless without /g
4387 (W regexp) You used the /c modifier with a regex operand, but didn't
4388 use the /g modifier. Currently, /c is meaningful only when /g is
4389 used. (This may change in the future.)
4391 =item Use of freed value in iteration
4393 (F) Perhaps you modified the iterated array within the loop?
4394 This error is typically caused by code like the following:
4397 @a = () for (1,2,@a);
4399 You are not supposed to modify arrays while they are being iterated over.
4400 For speed and efficiency reasons, Perl internally does not do full
4401 reference-counting of iterated items, hence deleting such an item in the
4402 middle of an iteration causes Perl to see a freed value.
4404 =item Use of *glob{FILEHANDLE} is deprecated
4406 (D deprecated) You are now encouraged to use the shorter *glob{IO} form
4407 to access the filehandle slot within a typeglob.
4409 =item Use of /g modifier is meaningless in split
4411 (W regexp) You used the /g modifier on the pattern for a C<split>
4412 operator. Since C<split> always tries to match the pattern
4413 repeatedly, the C</g> has no effect.
4415 =item Use of implicit split to @_ is deprecated
4417 (D deprecated) It makes a lot of work for the compiler when you clobber
4418 a subroutine's argument list, so it's better if you assign the results
4419 of a split() explicitly to an array (or list).
4421 =item Use of inherited AUTOLOAD for non-method %s() is deprecated
4423 (D deprecated) As an (ahem) accidental feature, C<AUTOLOAD> subroutines
4424 are looked up as methods (using the C<@ISA> hierarchy) even when the
4425 subroutines to be autoloaded were called as plain functions (e.g.
4426 C<Foo::bar()>), not as methods (e.g. C<< Foo->bar() >> or C<<
4429 This bug will be rectified in future by using method lookup only for
4430 methods' C<AUTOLOAD>s. However, there is a significant base of existing
4431 code that may be using the old behavior. So, as an interim step, Perl
4432 currently issues an optional warning when non-methods use inherited
4435 The simple rule is: Inheritance will not work when autoloading
4436 non-methods. The simple fix for old code is: In any module that used
4437 to depend on inheriting C<AUTOLOAD> for non-methods from a base class
4438 named C<BaseClass>, execute C<*AUTOLOAD = \&BaseClass::AUTOLOAD> during
4441 In code that currently says C<use AutoLoader; @ISA = qw(AutoLoader);>
4442 you should remove AutoLoader from @ISA and change C<use AutoLoader;> to
4443 C<use AutoLoader 'AUTOLOAD';>.
4445 =item Use of %s in printf format not supported
4447 (F) You attempted to use a feature of printf that is accessible from
4448 only C. This usually means there's a better way to do it in Perl.
4450 =item Use of %s is deprecated
4452 (D deprecated) The construct indicated is no longer recommended for use,
4453 generally because there's a better way to do it, and also because the
4454 old way has bad side effects.
4456 =item Use of -l on filehandle %s
4458 (W io) A filehandle represents an opened file, and when you opened the file
4459 it already went past any symlink you are presumably trying to look for.
4460 The operation returned C<undef>. Use a filename instead.
4462 =item Use of "package" with no arguments is deprecated
4464 (D deprecated) You used the C<package> keyword without specifying a package
4465 name. So no namespace is current at all. Using this can cause many
4466 otherwise reasonable constructs to fail in baffling ways. C<use strict;>
4469 =item Use of reference "%s" as array index
4471 (W misc) You tried to use a reference as an array index; this probably
4472 isn't what you mean, because references in numerical context tend
4473 to be huge numbers, and so usually indicates programmer error.
4475 If you really do mean it, explicitly numify your reference, like so:
4476 C<$array[0+$ref]>. This warning is not given for overloaded objects,
4477 either, because you can overload the numification and stringification
4478 operators and then you assumedly know what you are doing.
4480 =item Use of reserved word "%s" is deprecated
4482 (D deprecated) The indicated bareword is a reserved word. Future
4483 versions of perl may use it as a keyword, so you're better off either
4484 explicitly quoting the word in a manner appropriate for its context of
4485 use, or using a different name altogether. The warning can be
4486 suppressed for subroutine names by either adding a C<&> prefix, or using
4487 a package qualifier, e.g. C<&our()>, or C<Foo::our()>.
4489 =item Use of tainted arguments in %s is deprecated
4491 (W taint, deprecated) You have supplied C<system()> or C<exec()> with multiple
4492 arguments and at least one of them is tainted. This used to be allowed
4493 but will become a fatal error in a future version of perl. Untaint your
4494 arguments. See L<perlsec>.
4496 =item Use of uninitialized value%s
4498 (W uninitialized) An undefined value was used as if it were already
4499 defined. It was interpreted as a "" or a 0, but maybe it was a mistake.
4500 To suppress this warning assign a defined value to your variables.
4502 To help you figure out what was undefined, perl will try to tell you the
4503 name of the variable (if any) that was undefined. In some cases it cannot
4504 do this, so it also tells you what operation you used the undefined value
4505 in. Note, however, that perl optimizes your program and the operation
4506 displayed in the warning may not necessarily appear literally in your
4507 program. For example, C<"that $foo"> is usually optimized into C<"that "
4508 . $foo>, and the warning will refer to the C<concatenation (.)> operator,
4509 even though there is no C<.> in your program.
4511 =item Using a hash as a reference is deprecated
4513 (D deprecated) You tried to use a hash as a reference, as in
4514 C<< %foo->{"bar"} >> or C<< %$ref->{"hello"} >>. Versions of perl <= 5.6.1
4515 used to allow this syntax, but shouldn't have. It is now deprecated, and will
4516 be removed in a future version.
4518 =item Using an array as a reference is deprecated
4520 (D deprecated) You tried to use an array as a reference, as in
4521 C<< @foo->[23] >> or C<< @$ref->[99] >>. Versions of perl <= 5.6.1 used to
4522 allow this syntax, but shouldn't have. It is now deprecated, and will be
4523 removed in a future version.
4525 =item UTF-16 surrogate %s
4527 (W utf8) You tried to generate half of an UTF-16 surrogate by
4528 requesting a Unicode character between the code points 0xD800 and
4529 0xDFFF (inclusive). That range is reserved exclusively for the use of
4530 UTF-16 encoding (by having two 16-bit UCS-2 characters); but Perl
4531 encodes its characters in UTF-8, so what you got is a very illegal
4532 character. If you really know what you are doing you can turn off
4533 this warning by C<no warnings 'utf8';>.
4535 =item Value of %s can be "0"; test with defined()
4537 (W misc) In a conditional expression, you used <HANDLE>, <*> (glob),
4538 C<each()>, or C<readdir()> as a boolean value. Each of these constructs
4539 can return a value of "0"; that would make the conditional expression
4540 false, which is probably not what you intended. When using these
4541 constructs in conditional expressions, test their values with the
4542 C<defined> operator.
4544 =item Value of CLI symbol "%s" too long
4546 (W misc) A warning peculiar to VMS. Perl tried to read the value of an
4547 %ENV element from a CLI symbol table, and found a resultant string
4548 longer than 1024 characters. The return value has been truncated to
4551 =item Variable "%s" is not available
4553 (W closure) During compilation, an inner named subroutine or eval is
4554 attempting to capture an outer lexical that is not currently available.
4555 This can happen for one of two reasons. First, the outer lexical may be
4556 declared in an outer anonymous subroutine that has not yet been created.
4557 (Remember that named subs are created at compile time, while anonymous
4558 subs are created at run-time.) For example,
4560 sub { my $a; sub f { $a } }
4562 At the time that f is created, it can't capture the current value of $a,
4563 since the anonymous subroutine hasn't been created yet. Conversely,
4564 the following won't give a warning since the anonymous subroutine has by
4565 now been created and is live:
4567 sub { my $a; eval 'sub f { $a }' }->();
4569 The second situation is caused by an eval accessing a variable that has
4570 gone out of scope, for example,
4578 Here, when the '$a' in the eval is being compiled, f() is not currently being
4579 executed, so its $a is not available for capture.
4581 =item Variable "%s" is not imported%s
4583 (F) While "use strict" in effect, you referred to a global variable that
4584 you apparently thought was imported from another module, because
4585 something else of the same name (usually a subroutine) is exported by
4586 that module. It usually means you put the wrong funny character on the
4587 front of your variable.
4589 =item Variable length lookbehind not implemented in regex; marked by <-- HERE in m/%s/
4591 (F) Lookbehind is allowed only for subexpressions whose length is fixed and
4592 known at compile time. The <-- HERE shows in the regular expression about
4593 where the problem was discovered. See L<perlre>.
4595 =item "%s" variable %s masks earlier declaration in same %s
4597 (W misc) A "my" or "our" variable has been redeclared in the current
4598 scope or statement, effectively eliminating all access to the previous
4599 instance. This is almost always a typographical error. Note that the
4600 earlier variable will still exist until the end of the scope or until
4601 all closure referents to it are destroyed.
4603 =item Variable syntax
4605 (A) You've accidentally run your script through B<csh> instead
4606 of Perl. Check the #! line, or manually feed your script into
4609 =item Variable "%s" will not stay shared
4611 (W closure) An inner (nested) I<named> subroutine is referencing a
4612 lexical variable defined in an outer named subroutine.
4614 When the inner subroutine is called, it will see the value of
4615 the outer subroutine's variable as it was before and during the *first*
4616 call to the outer subroutine; in this case, after the first call to the
4617 outer subroutine is complete, the inner and outer subroutines will no
4618 longer share a common value for the variable. In other words, the
4619 variable will no longer be shared.
4621 This problem can usually be solved by making the inner subroutine
4622 anonymous, using the C<sub {}> syntax. When inner anonymous subs that
4623 reference variables in outer subroutines are created, they
4624 are automatically rebound to the current values of such variables.
4626 =item Version number must be a constant number
4628 (P) The attempt to translate a C<use Module n.n LIST> statement into
4629 its equivalent C<BEGIN> block found an internal inconsistency with
4632 =item v-string in use/require is non-portable
4634 (W portable) The use of v-strings is non-portable to older, pre-5.6, Perls.
4635 If you want your scripts to be backward portable, use the floating
4636 point version number: for example, instead of C<use 5.6.1> say
4637 C<use 5.006_001>. This of course won't help: the older Perls
4638 won't suddenly start understanding newer features, but at least
4639 they will show a sensible error message indicating the required
4642 =item Warning: something's wrong
4644 (W) You passed warn() an empty string (the equivalent of C<warn "">) or
4645 you called it with no args and C<$_> was empty.
4647 =item Warning: unable to close filehandle %s properly
4649 (S) The implicit close() done by an open() got an error indication on
4650 the close(). This usually indicates your file system ran out of disk
4653 =item Warning: Use of "%s" without parentheses is ambiguous
4655 (S ambiguous) You wrote a unary operator followed by something that
4656 looks like a binary operator that could also have been interpreted as a
4657 term or unary operator. For instance, if you know that the rand
4658 function has a default argument of 1.0, and you write
4662 you may THINK you wrote the same thing as
4666 but in actual fact, you got
4670 So put in parentheses to say what you really mean.
4672 =item Wide character in %s
4674 (W utf8) Perl met a wide character (>255) when it wasn't expecting
4675 one. This warning is by default on for I/O (like print). The easiest
4676 way to quiet this warning is simply to add the C<:utf8> layer to the
4677 output, e.g. C<binmode STDOUT, ':utf8'>. Another way to turn off the
4678 warning is to add C<no warnings 'utf8';> but that is often closer to
4679 cheating. In general, you are supposed to explicitly mark the
4680 filehandle with an encoding, see L<open> and L<perlfunc/binmode>.
4682 =item Within []-length '%c' not allowed
4684 (F) The count in the (un)pack template may be replaced by C<[TEMPLATE]> only if
4685 C<TEMPLATE> always matches the same amount of packed bytes that can be
4686 determined from the template alone. This is not possible if it contains an
4687 of the codes @, /, U, u, w or a *-length. Redesign the template.
4689 =item write() on closed filehandle %s
4691 (W closed) The filehandle you're writing to got itself closed sometime
4692 before now. Check your control flow.
4694 =item %s "\x%s" does not map to Unicode
4696 When reading in different encodings Perl tries to map everything
4697 into Unicode characters. The bytes you read in are not legal in
4698 this encoding, for example
4700 utf8 "\xE4" does not map to Unicode
4702 if you try to read in the a-diaereses Latin-1 as UTF-8.
4704 =item 'X' outside of string
4706 (F) You had a (un)pack template that specified a relative position before
4707 the beginning of the string being (un)packed. See L<perlfunc/pack>.
4709 =item 'x' outside of string in unpack
4711 (F) You had a pack template that specified a relative position after
4712 the end of the string being unpacked. See L<perlfunc/pack>.
4714 =item YOU HAVEN'T DISABLED SET-ID SCRIPTS IN THE KERNEL YET!
4716 (F) And you probably never will, because you probably don't have the
4717 sources to your kernel, and your vendor probably doesn't give a rip
4718 about what you want. Your best bet is to put a setuid C wrapper around
4721 =item You need to quote "%s"
4723 (W syntax) You assigned a bareword as a signal handler name.
4724 Unfortunately, you already have a subroutine of that name declared,
4725 which means that Perl 5 will try to call the subroutine when the
4726 assignment is executed, which is probably not what you want. (If it IS
4727 what you want, put an & in front.)
4729 =item Your random numbers are not that random
4731 (F) When trying to initialise the random seed for hashes, Perl could
4732 not get any randomness out of your system. This usually indicates
4733 Something Very Wrong.