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<$SIG{__WARN__}>
27 to a reference to a routine that will be called on each warning instead
28 of printing it. See L<perlvar>.
30 Default warnings are always enabled unless they are explicitly disabled
31 with the C<warnings> pragma or the B<-X> switch.
33 Trappable errors may be trapped using the eval operator. See
34 L<perlfunc/eval>. In almost all cases, warnings may be selectively
35 disabled or promoted to fatal errors using the C<warnings> pragma.
38 The messages are in alphabetical order, without regard to upper or
39 lower-case. Some of these messages are generic. Spots that vary are
40 denoted with a %s or other printf-style escape. These escapes are
41 ignored by the alphabetical order, as are all characters other than
42 letters. To look up your message, just ignore anything that is not a
47 =item accept() on closed socket %s
49 (W closed) You tried to do an accept on a closed socket. Did you forget
50 to check the return value of your socket() call? See
53 =item Allocation too large: %lx
55 (X) You can't allocate more than 64K on an MS-DOS machine.
57 =item '!' allowed only after types %s
59 (F) The '!' is allowed in pack() or unpack() only after certain types.
62 =item Ambiguous call resolved as CORE::%s(), qualify as such or use &
64 (W ambiguous) A subroutine you have declared has the same name as a Perl
65 keyword, and you have used the name without qualification for calling
66 one or the other. Perl decided to call the builtin because the
67 subroutine is not imported.
69 To force interpretation as a subroutine call, either put an ampersand
70 before the subroutine name, or qualify the name with its package.
71 Alternatively, you can import the subroutine (or pretend that it's
72 imported with the C<use subs> pragma).
74 To silently interpret it as the Perl operator, use the C<CORE::> prefix
75 on the operator (e.g. C<CORE::log($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 Array @%s missing the @ in argument %d of %s()
168 (D deprecated) Really old Perl let you omit the @ on array names in some
169 spots. This is now heavily deprecated.
171 =item assertion botched: %s
173 (P) The malloc package that comes with Perl had an internal failure.
175 =item Assertion failed: file "%s"
177 (P) A general assertion failed. The file in question must be examined.
179 =item Assignment to both a list and a scalar
181 (F) If you assign to a conditional operator, the 2nd and 3rd arguments
182 must either both be scalars or both be lists. Otherwise Perl won't
183 know which context to supply to the right side.
185 =item A thread exited while %d threads were running
187 (W) When using threaded Perl, a thread (not necessarily the main
188 thread) exited while there were still other threads running.
189 Usually it's a good idea to first collect the return values of the
190 created threads by joining them, and only then exit from the main
191 thread. See L<threads>.
193 =item Attempt to access disallowed key '%s' in a restricted hash
195 (F) The failing code has attempted to get or set a key which is not in
196 the current set of allowed keys of a restricted hash.
198 =item Attempt to delete readonly key '%s' from a restricted hash
200 (F) The failing code attempted to delete a key whose value has been
201 declared readonly from a restricted hash.
203 =item Attempt to delete disallowed key '%s' from a restricted hash
205 (F) The failing code attempted to delete from a restricted hash a key
206 which is not in its key set.
208 =item Attempt to bless into a reference
210 (F) The CLASSNAME argument to the bless() operator is expected to be
211 the name of the package to bless the resulting object into. You've
212 supplied instead a reference to something: perhaps you wrote
218 bless $self, ref($proto) || $proto;
220 If you actually want to bless into the stringified version
221 of the reference supplied, you need to stringify it yourself, for
224 bless $self, "$proto";
226 =item Attempt to delete disallowed key '%s' from a restricted hash
228 (F) The failing code attempted to delete from a restricted hash a key
229 which is not in its key set.
231 =item Attempt to delete readonly key '%s' from a restricted hash
233 (F) The failing code attempted to delete a key whose value has been
234 declared readonly from a restricted hash.
236 =item Attempt to free non-arena SV: 0x%lx
238 (P internal) All SV objects are supposed to be allocated from arenas
239 that will be garbage collected on exit. An SV was discovered to be
240 outside any of those arenas.
242 =item Attempt to free nonexistent shared string
244 (P internal) Perl maintains a reference counted internal table of
245 strings to optimize the storage and access of hash keys and other
246 strings. This indicates someone tried to decrement the reference count
247 of a string that can no longer be found in the table.
249 =item Attempt to free temp prematurely
251 (W debugging) Mortalized values are supposed to be freed by the
252 free_tmps() routine. This indicates that something else is freeing the
253 SV before the free_tmps() routine gets a chance, which means that the
254 free_tmps() routine will be freeing an unreferenced scalar when it does
257 =item Attempt to free unreferenced glob pointers
259 (P internal) The reference counts got screwed up on symbol aliases.
261 =item Attempt to free unreferenced scalar
263 (W internal) Perl went to decrement the reference count of a scalar to
264 see if it would go to 0, and discovered that it had already gone to 0
265 earlier, and should have been freed, and in fact, probably was freed.
266 This could indicate that SvREFCNT_dec() was called too many times, or
267 that SvREFCNT_inc() was called too few times, or that the SV was
268 mortalized when it shouldn't have been, or that memory has been
271 =item Attempt to join self
273 (F) You tried to join a thread from within itself, which is an
274 impossible task. You may be joining the wrong thread, or you may need
275 to move the join() to some other thread.
277 =item Attempt to pack pointer to temporary value
279 (W pack) You tried to pass a temporary value (like the result of a
280 function, or a computed expression) to the "p" pack() template. This
281 means the result contains a pointer to a location that could become
282 invalid anytime, even before the end of the current statement. Use
283 literals or global values as arguments to the "p" pack() template to
286 =item Attempt to use reference as lvalue in substr
288 (W substr) You supplied a reference as the first argument to substr()
289 used as an lvalue, which is pretty strange. Perhaps you forgot to
290 dereference it first. See L<perlfunc/substr>.
292 =item Bad arg length for %s, is %d, should be %s
294 (F) You passed a buffer of the wrong size to one of msgctl(), semctl()
295 or shmctl(). In C parlance, the correct sizes are, respectively,
296 S<sizeof(struct msqid_ds *)>, S<sizeof(struct semid_ds *)>, and
297 S<sizeof(struct shmid_ds *)>.
299 =item Bad evalled substitution pattern
301 (F) You've used the C</e> switch to evaluate the replacement for a
302 substitution, but perl found a syntax error in the code to evaluate,
303 most likely an unexpected right brace '}'.
305 =item Bad filehandle: %s
307 (F) A symbol was passed to something wanting a filehandle, but the
308 symbol has no filehandle associated with it. Perhaps you didn't do an
309 open(), or did it in another package.
311 =item Bad free() ignored
313 (S malloc) An internal routine called free() on something that had never
314 been malloc()ed in the first place. Mandatory, but can be disabled by
315 setting environment variable C<PERL_BADFREE> to 0.
317 This message can be seen quite often with DB_File on systems with "hard"
318 dynamic linking, like C<AIX> and C<OS/2>. It is a bug of C<Berkeley DB>
319 which is left unnoticed if C<DB> uses I<forgiving> system malloc().
323 (P) One of the internal hash routines was passed a null HV pointer.
325 =item Badly placed ()'s
327 (A) You've accidentally run your script through B<csh> instead
328 of Perl. Check the #! line, or manually feed your script into
331 =item Bad name after %s::
333 (F) You started to name a symbol by using a package prefix, and then
334 didn't finish the symbol. In particular, you can't interpolate outside
343 $sym = "mypack::$var";
345 =item Bad realloc() ignored
347 (S malloc) An internal routine called realloc() on something that had
348 never been malloc()ed in the first place. Mandatory, but can be disabled
349 by setting environment variable C<PERL_BADFREE> to 1.
351 =item Bad symbol for array
353 (P) An internal request asked to add an array entry to something that
354 wasn't a symbol table entry.
356 =item Bad symbol for filehandle
358 (P) An internal request asked to add a filehandle entry to something
359 that wasn't a symbol table entry.
361 =item Bad symbol for hash
363 (P) An internal request asked to add a hash entry to something that
364 wasn't a symbol table entry.
366 =item Bareword found in conditional
368 (W bareword) The compiler found a bareword where it expected a
369 conditional, which often indicates that an || or && was parsed as part
370 of the last argument of the previous construct, for example:
374 It may also indicate a misspelled constant that has been interpreted as
377 use constant TYPO => 1;
378 if (TYOP) { print "foo" }
380 The C<strict> pragma is useful in avoiding such errors.
382 =item Bareword "%s" not allowed while "strict subs" in use
384 (F) With "strict subs" in use, a bareword is only allowed as a
385 subroutine identifier, in curly brackets or to the left of the "=>"
386 symbol. Perhaps you need to predeclare a subroutine?
388 =item Bareword "%s" refers to nonexistent package
390 (W bareword) You used a qualified bareword of the form C<Foo::>, but the
391 compiler saw no other uses of that namespace before that point. Perhaps
392 you need to predeclare a package?
394 =item BEGIN failed--compilation aborted
396 (F) An untrapped exception was raised while executing a BEGIN
397 subroutine. Compilation stops immediately and the interpreter is
400 =item BEGIN not safe after errors--compilation aborted
402 (F) Perl found a C<BEGIN {}> subroutine (or a C<use> directive, which
403 implies a C<BEGIN {}>) after one or more compilation errors had already
404 occurred. Since the intended environment for the C<BEGIN {}> could not
405 be guaranteed (due to the errors), and since subsequent code likely
406 depends on its correct operation, Perl just gave up.
408 =item \1 better written as $1
410 (W syntax) Outside of patterns, backreferences live on as variables.
411 The use of backslashes is grandfathered on the right-hand side of a
412 substitution, but stylistically it's better to use the variable form
413 because other Perl programmers will expect it, and it works better if
414 there are more than 9 backreferences.
416 =item Binary number > 0b11111111111111111111111111111111 non-portable
418 (W portable) The binary number you specified is larger than 2**32-1
419 (4294967295) and therefore non-portable between systems. See
420 L<perlport> for more on portability concerns.
422 =item bind() on closed socket %s
424 (W closed) You tried to do a bind on a closed socket. Did you forget to
425 check the return value of your socket() call? See L<perlfunc/bind>.
427 =item binmode() on closed filehandle %s
429 (W unopened) You tried binmode() on a filehandle that was never opened.
430 Check you control flow and number of arguments.
432 =item Bit vector size > 32 non-portable
434 (W portable) Using bit vector sizes larger than 32 is non-portable.
436 =item Bizarre copy of %s in %s
438 (P) Perl detected an attempt to copy an internal value that is not
441 =item Buffer overflow in prime_env_iter: %s
443 (W internal) A warning peculiar to VMS. While Perl was preparing to
444 iterate over %ENV, it encountered a logical name or symbol definition
445 which was too long, so it was truncated to the string shown.
447 =item Callback called exit
449 (F) A subroutine invoked from an external package via call_sv()
450 exited by calling exit.
452 =item %s() called too early to check prototype
454 (W prototype) You've called a function that has a prototype before the
455 parser saw a definition or declaration for it, and Perl could not check
456 that the call conforms to the prototype. You need to either add an
457 early prototype declaration for the subroutine in question, or move the
458 subroutine definition ahead of the call to get proper prototype
459 checking. Alternatively, if you are certain that you're calling the
460 function correctly, you may put an ampersand before the name to avoid
461 the warning. See L<perlsub>.
463 =item Cannot compress integer in pack
465 (F) An argument to pack("w",...) was too large to compress. The BER
466 compressed integer format can only be used with positive integers, and you
467 attempted to compress Infinity or a very large number (> 1e308).
468 See L<perlfunc/pack>.
470 =item Cannot compress negative numbers in pack
472 (F) An argument to pack("w",...) was negative. The BER compressed integer
473 format can only be used with positive integers. See L<perlfunc/pack>.
475 =item Can only compress unsigned integers in pack
477 (F) An argument to pack("w",...) was not an integer. The BER compressed
478 integer format can only be used with positive integers, and you attempted
479 to compress something else. See L<perlfunc/pack>.
481 =item Can't bless non-reference value
483 (F) Only hard references may be blessed. This is how Perl "enforces"
484 encapsulation of objects. See L<perlobj>.
486 =item Can't call method "%s" in empty package "%s"
488 (F) You called a method correctly, and it correctly indicated a package
489 functioning as a class, but that package doesn't have ANYTHING defined
490 in it, let alone methods. See L<perlobj>.
492 =item Can't call method "%s" on an undefined value
494 (F) You used the syntax of a method call, but the slot filled by the
495 object reference or package name contains an undefined value. Something
496 like this will reproduce the error:
499 process $BADREF 1,2,3;
500 $BADREF->process(1,2,3);
502 =item Can't call method "%s" on unblessed reference
504 (F) A method call must know in what package it's supposed to run. It
505 ordinarily finds this out from the object reference you supply, but you
506 didn't supply an object reference in this case. A reference isn't an
507 object reference until it has been blessed. See L<perlobj>.
509 =item Can't call method "%s" without a package or object reference
511 (F) You used the syntax of a method call, but the slot filled by the
512 object reference or package name contains an expression that returns a
513 defined value which is neither an object reference nor a package name.
514 Something like this will reproduce the error:
517 process $BADREF 1,2,3;
518 $BADREF->process(1,2,3);
520 =item Can't chdir to %s
522 (F) You called C<perl -x/foo/bar>, but C</foo/bar> is not a directory
523 that you can chdir to, possibly because it doesn't exist.
525 =item Can't check filesystem of script "%s" for nosuid
527 (P) For some reason you can't check the filesystem of the script for
530 =item Can't coerce array into hash
532 (F) You used an array where a hash was expected, but the array has no
533 information on how to map from keys to array indices. You can do that
534 only with arrays that have a hash reference at index 0.
536 =item Can't coerce %s to integer in %s
538 (F) Certain types of SVs, in particular real symbol table entries
539 (typeglobs), can't be forced to stop being what they are. So you can't
549 but then $foo no longer contains a glob.
551 =item Can't coerce %s to number in %s
553 (F) Certain types of SVs, in particular real symbol table entries
554 (typeglobs), can't be forced to stop being what they are.
556 =item Can't coerce %s to string in %s
558 (F) Certain types of SVs, in particular real symbol table entries
559 (typeglobs), can't be forced to stop being what they are.
561 =item Can't create pipe mailbox
563 (P) An error peculiar to VMS. The process is suffering from exhausted
564 quotas or other plumbing problems.
566 =item Can't declare class for non-scalar %s in "%s"
568 (F) Currently, only scalar variables can be declared with a specific
569 class qualifier in a "my" or "our" declaration. The semantics may be
570 extended for other types of variables in future.
572 =item Can't declare %s in "%s"
574 (F) Only scalar, array, and hash variables may be declared as "my" or
575 "our" variables. They must have ordinary identifiers as names.
577 =item Can't do inplace edit: %s is not a regular file
579 (S inplace) You tried to use the B<-i> switch on a special file, such as
580 a file in /dev, or a FIFO. The file was ignored.
582 =item Can't do inplace edit on %s: %s
584 (S inplace) The creation of the new file failed for the indicated
587 =item Can't do inplace edit without backup
589 (F) You're on a system such as MS-DOS that gets confused if you try
590 reading from a deleted (but still opened) file. You have to say
591 C<-i.bak>, or some such.
593 =item Can't do inplace edit: %s would not be unique
595 (S inplace) Your filesystem does not support filenames longer than 14
596 characters and Perl was unable to create a unique filename during
597 inplace editing with the B<-i> switch. The file was ignored.
599 =item Can't do {n,m} with n > m in regex; marked by <-- HERE in m/%s/
601 (F) Minima must be less than or equal to maxima. If you really want your
602 regexp to match something 0 times, just put {0}. The <-- HERE shows in the
603 regular expression about where the problem was discovered. See L<perlre>.
605 =item Can't do setegid!
607 (P) The setegid() call failed for some reason in the setuid emulator of
610 =item Can't do seteuid!
612 (P) The setuid emulator of suidperl failed for some reason.
614 =item Can't do setuid
616 (F) This typically means that ordinary perl tried to exec suidperl to do
617 setuid emulation, but couldn't exec it. It looks for a name of the form
618 sperl5.000 in the same directory that the perl executable resides under
619 the name perl5.000, typically /usr/local/bin on Unix machines. If the
620 file is there, check the execute permissions. If it isn't, ask your
621 sysadmin why he and/or she removed it.
623 =item Can't do waitpid with flags
625 (F) This machine doesn't have either waitpid() or wait4(), so only
626 waitpid() without flags is emulated.
628 =item Can't emulate -%s on #! line
630 (F) The #! line specifies a switch that doesn't make sense at this
631 point. For example, it'd be kind of silly to put a B<-x> on the #!
634 =item Can't exec "%s": %s
636 (W exec) A system(), exec(), or piped open call could not execute the
637 named program for the indicated reason. Typical reasons include: the
638 permissions were wrong on the file, the file wasn't found in
639 C<$ENV{PATH}>, the executable in question was compiled for another
640 architecture, or the #! line in a script points to an interpreter that
641 can't be run for similar reasons. (Or maybe your system doesn't support
646 (F) Perl was trying to execute the indicated program for you because
647 that's what the #! line said. If that's not what you wanted, you may
648 need to mention "perl" on the #! line somewhere.
650 =item Can't execute %s
652 (F) You used the B<-S> switch, but the copies of the script to execute
653 found in the PATH did not have correct permissions.
655 =item Can't find an opnumber for "%s"
657 (F) A string of a form C<CORE::word> was given to prototype(), but there
658 is no builtin with the name C<word>.
660 =item Can't find %s character property "%s"
662 (F) You used C<\p{}> or C<\P{}> but the character property by that name
663 could not be found. Maybe you misspelled the name of the property
664 (remember that the names of character properties consist only of
665 alphanumeric characters), or maybe you forgot the C<Is> or C<In> prefix?
667 =item Can't find label %s
669 (F) You said to goto a label that isn't mentioned anywhere that it's
670 possible for us to go to. See L<perlfunc/goto>.
672 =item Can't find %s on PATH
674 (F) You used the B<-S> switch, but the script to execute could not be
677 =item Can't find %s on PATH, '.' not in PATH
679 (F) You used the B<-S> switch, but the script to execute could not be
680 found in the PATH, or at least not with the correct permissions. The
681 script exists in the current directory, but PATH prohibits running it.
683 =item Can't find %s property definition %s
685 (F) You may have tried to use C<\p> which means a Unicode property (for
686 example C<\p{Lu}> is all uppercase letters). If you did mean to use a
687 Unicode property, see L<perlunicode> for the list of known properties.
688 If you didn't mean to use a Unicode property, escape the C<\p>, either
689 by C<\\p> (just the C<\p>) or by C<\Q\p> (the rest of the string, until
692 =item Can't find string terminator %s anywhere before EOF
694 (F) Perl strings can stretch over multiple lines. This message means
695 that the closing delimiter was omitted. Because bracketed quotes count
696 nesting levels, the following is missing its final parenthesis:
698 print q(The character '(' starts a side comment.);
700 If you're getting this error from a here-document, you may have included
701 unseen whitespace before or after your closing tag. A good programmer's
702 editor will have a way to help you find these characters.
706 (F) A fatal error occurred while trying to fork while opening a
709 =item Can't get filespec - stale stat buffer?
711 (S) A warning peculiar to VMS. This arises because of the difference
712 between access checks under VMS and under the Unix model Perl assumes.
713 Under VMS, access checks are done by filename, rather than by bits in
714 the stat buffer, so that ACLs and other protections can be taken into
715 account. Unfortunately, Perl assumes that the stat buffer contains all
716 the necessary information, and passes it, instead of the filespec, to
717 the access checking routine. It will try to retrieve the filespec using
718 the device name and FID present in the stat buffer, but this works only
719 if you haven't made a subsequent call to the CRTL stat() routine,
720 because the device name is overwritten with each call. If this warning
721 appears, the name lookup failed, and the access checking routine gave up
722 and returned FALSE, just to be conservative. (Note: The access checking
723 routine knows about the Perl C<stat> operator and file tests, so you
724 shouldn't ever see this warning in response to a Perl command; it arises
725 only if some internal code takes stat buffers lightly.)
727 =item Can't get pipe mailbox device name
729 (P) An error peculiar to VMS. After creating a mailbox to act as a
730 pipe, Perl can't retrieve its name for later use.
732 =item Can't get SYSGEN parameter value for MAXBUF
734 (P) An error peculiar to VMS. Perl asked $GETSYI how big you want your
735 mailbox buffers to be, and didn't get an answer.
737 =item Can't "goto" into the middle of a foreach loop
739 (F) A "goto" statement was executed to jump into the middle of a foreach
740 loop. You can't get there from here. See L<perlfunc/goto>.
742 =item Can't "goto" out of a pseudo block
744 (F) A "goto" statement was executed to jump out of what might look like
745 a block, except that it isn't a proper block. This usually occurs if
746 you tried to jump out of a sort() block or subroutine, which is a no-no.
747 See L<perlfunc/goto>.
749 =item Can't goto subroutine from an eval-string
751 (F) The "goto subroutine" call can't be used to jump out of an eval
752 "string". (You can use it to jump out of an eval {BLOCK}, but you
753 probably don't want to.)
755 =item Can't goto subroutine outside a subroutine
757 (F) The deeply magical "goto subroutine" call can only replace one
758 subroutine call for another. It can't manufacture one out of whole
759 cloth. In general you should be calling it out of only an AUTOLOAD
760 routine anyway. See L<perlfunc/goto>.
762 =item Can't ignore signal CHLD, forcing to default
764 (W signal) Perl has detected that it is being run with the SIGCHLD
765 signal (sometimes known as SIGCLD) disabled. Since disabling this
766 signal will interfere with proper determination of exit status of child
767 processes, Perl has reset the signal to its default value. This
768 situation typically indicates that the parent program under which Perl
769 may be running (e.g. cron) is being very careless.
771 =item Can't "last" outside a loop block
773 (F) A "last" statement was executed to break out of the current block,
774 except that there's this itty bitty problem called there isn't a current
775 block. Note that an "if" or "else" block doesn't count as a "loopish"
776 block, as doesn't a block given to sort(), map() or grep(). You can
777 usually double the curlies to get the same effect though, because the
778 inner curlies will be considered a block that loops once. See
781 =item Can't localize lexical variable %s
783 (F) You used local on a variable name that was previously declared as a
784 lexical variable using "my". This is not allowed. If you want to
785 localize a package variable of the same name, qualify it with the
788 =item Can't localize through a reference
790 (F) You said something like C<local $$ref>, which Perl can't currently
791 handle, because when it goes to restore the old value of whatever $ref
792 pointed to after the scope of the local() is finished, it can't be sure
793 that $ref will still be a reference.
795 =item Can't locate %s
797 (F) You said to C<do> (or C<require>, or C<use>) a file that couldn't be
798 found. Perl looks for the file in all the locations mentioned in @INC,
799 unless the file name included the full path to the file. Perhaps you
800 need to set the PERL5LIB or PERL5OPT environment variable to say where
801 the extra library is, or maybe the script needs to add the library name
802 to @INC. Or maybe you just misspelled the name of the file. See
803 L<perlfunc/require> and L<lib>.
805 =item Can't locate auto/%s.al in @INC
807 (F) A function (or method) was called in a package which allows
808 autoload, but there is no function to autoload. Most probable causes
809 are a misprint in a function/method name or a failure to C<AutoSplit>
810 the file, say, by doing C<make install>.
812 =item Can't locate object method "%s" via package "%s"
814 (F) You called a method correctly, and it correctly indicated a package
815 functioning as a class, but that package doesn't define that particular
816 method, nor does any of its base classes. See L<perlobj>.
818 =item Can't locate PerlIO%s
820 (F) You tried to use in open() a PerlIO layer that does not exist,
821 e.g. open(FH, ">:nosuchlayer", "somefile").
823 =item Can't locate package %s for @%s::ISA
825 (W syntax) The @ISA array contained the name of another package that
826 doesn't seem to exist.
828 =item Can't make list assignment to \%ENV on this system
830 (F) List assignment to %ENV is not supported on some systems, notably
833 =item Can't modify %s in %s
835 (F) You aren't allowed to assign to the item indicated, or otherwise try
836 to change it, such as with an auto-increment.
838 =item Can't modify nonexistent substring
840 (P) The internal routine that does assignment to a substr() was handed
843 =item Can't modify non-lvalue subroutine call
845 (F) Subroutines meant to be used in lvalue context should be declared as
846 such, see L<perlsub/"Lvalue subroutines">.
848 =item Can't msgrcv to read-only var
850 (F) The target of a msgrcv must be modifiable to be used as a receive
853 =item Can't "next" outside a loop block
855 (F) A "next" statement was executed to reiterate the current block, but
856 there isn't a current block. Note that an "if" or "else" block doesn't
857 count as a "loopish" block, as doesn't a block given to sort(), map() or
858 grep(). You can usually double the curlies to get the same effect
859 though, because the inner curlies will be considered a block that loops
860 once. See L<perlfunc/next>.
862 =item Can't open %s: %s
864 (S inplace) The implicit opening of a file through use of the C<< <> >>
865 filehandle, either implicitly under the C<-n> or C<-p> command-line
866 switches, or explicitly, failed for the indicated reason. Usually this
867 is because you don't have read permission for a file which you named on
870 =item Can't open a reference
872 (W io) You tried to open a scalar reference for reading or writing,
873 using the 3-arg open() syntax :
877 but your version of perl is compiled without perlio, and this form of
878 open is not supported.
880 =item Can't open bidirectional pipe
882 (W pipe) You tried to say C<open(CMD, "|cmd|")>, which is not supported.
883 You can try any of several modules in the Perl library to do this, such
884 as IPC::Open2. Alternately, direct the pipe's output to a file using
885 ">", and then read it in under a different file handle.
887 =item Can't open error file %s as stderr
889 (F) An error peculiar to VMS. Perl does its own command line
890 redirection, and couldn't open the file specified after '2>' or '2>>' on
891 the command line for writing.
893 =item Can't open input file %s as stdin
895 (F) An error peculiar to VMS. Perl does its own command line
896 redirection, and couldn't open the file specified after '<' on the
897 command line for reading.
899 =item Can't open output file %s as stdout
901 (F) An error peculiar to VMS. Perl does its own command line
902 redirection, and couldn't open the file specified after '>' or '>>' on
903 the command line for writing.
905 =item Can't open output pipe (name: %s)
907 (P) An error peculiar to VMS. Perl does its own command line
908 redirection, and couldn't open the pipe into which to send data destined
911 =item Can't open perl script%s: %s
913 (F) The script you specified can't be opened for the indicated reason.
915 =item Can't read CRTL environ
917 (S) A warning peculiar to VMS. Perl tried to read an element of %ENV
918 from the CRTL's internal environment array and discovered the array was
919 missing. You need to figure out where your CRTL misplaced its environ
920 or define F<PERL_ENV_TABLES> (see L<perlvms>) so that environ is not
923 =item Can't redefine active sort subroutine %s
925 (F) Perl optimizes the internal handling of sort subroutines and keeps
926 pointers into them. You tried to redefine one such sort subroutine when
927 it was currently active, which is not allowed. If you really want to do
928 this, you should write C<sort { &func } @x> instead of C<sort func @x>.
930 =item Can't "redo" outside a loop block
932 (F) A "redo" statement was executed to restart the current block, but
933 there isn't a current block. Note that an "if" or "else" block doesn't
934 count as a "loopish" block, as doesn't a block given to sort(), map()
935 or grep(). You can usually double the curlies to get the same effect
936 though, because the inner curlies will be considered a block that
937 loops once. See L<perlfunc/redo>.
939 =item Can't remove %s: %s, skipping file
941 (S inplace) You requested an inplace edit without creating a backup
942 file. Perl was unable to remove the original file to replace it with
943 the modified file. The file was left unmodified.
945 =item Can't rename %s to %s: %s, skipping file
947 (S inplace) The rename done by the B<-i> switch failed for some reason,
948 probably because you don't have write permission to the directory.
950 =item Can't reopen input pipe (name: %s) in binary mode
952 (P) An error peculiar to VMS. Perl thought stdin was a pipe, and tried
953 to reopen it to accept binary data. Alas, it failed.
955 =item Can't resolve method `%s' overloading `%s' in package `%s'
957 (F|P) Error resolving overloading specified by a method name (as opposed
958 to a subroutine reference): no such method callable via the package. If
959 method name is C<???>, this is an internal error.
961 =item Can't reswap uid and euid
963 (P) The setreuid() call failed for some reason in the setuid emulator of
966 =item Can't return %s from lvalue subroutine
968 (F) Perl detected an attempt to return illegal lvalues (such as
969 temporary or readonly values) from a subroutine used as an lvalue. This
972 =item Can't return outside a subroutine
974 (F) The return statement was executed in mainline code, that is, where
975 there was no subroutine call to return out of. See L<perlsub>.
977 =item Can't return %s to lvalue scalar context
979 (F) You tried to return a complete array or hash from an lvalue subroutine,
980 but you called the subroutine in a way that made Perl think you meant
981 to return only one value. You probably meant to write parentheses around
982 the call to the subroutine, which tell Perl that the call should be in
985 =item Can't stat script "%s"
987 (P) For some reason you can't fstat() the script even though you have it
988 open already. Bizarre.
990 =item Can't swap uid and euid
992 (P) The setreuid() call failed for some reason in the setuid emulator of
995 =item Can't take log of %g
997 (F) For ordinary real numbers, you can't take the logarithm of a
998 negative number or zero. There's a Math::Complex package that comes
999 standard with Perl, though, if you really want to do that for the
1002 =item Can't take sqrt of %g
1004 (F) For ordinary real numbers, you can't take the square root of a
1005 negative number. There's a Math::Complex package that comes standard
1006 with Perl, though, if you really want to do that.
1008 =item Can't undef active subroutine
1010 (F) You can't undefine a routine that's currently running. You can,
1011 however, redefine it while it's running, and you can even undef the
1012 redefined subroutine while the old routine is running. Go figure.
1016 (F) You tried to unshift an "unreal" array that can't be unshifted, such
1017 as the main Perl stack.
1019 =item Can't upgrade that kind of scalar
1021 (P) The internal sv_upgrade routine adds "members" to an SV, making it
1022 into a more specialized kind of SV. The top several SV types are so
1023 specialized, however, that they cannot be interconverted. This message
1024 indicates that such a conversion was attempted.
1026 =item Can't upgrade to undef
1028 (P) The undefined SV is the bottom of the totem pole, in the scheme of
1029 upgradability. Upgrading to undef indicates an error in the code
1032 =item Can't use anonymous symbol table for method lookup
1034 (P) The internal routine that does method lookup was handed a symbol
1035 table that doesn't have a name. Symbol tables can become anonymous
1036 for example by undefining stashes: C<undef %Some::Package::>.
1038 =item Can't use an undefined value as %s reference
1040 (F) A value used as either a hard reference or a symbolic reference must
1041 be a defined value. This helps to delurk some insidious errors.
1043 =item Can't use bareword ("%s") as %s ref while "strict refs" in use
1045 (F) Only hard references are allowed by "strict refs". Symbolic
1046 references are disallowed. See L<perlref>.
1048 =item Can't use %! because Errno.pm is not available
1050 (F) The first time the %! hash is used, perl automatically loads the
1051 Errno.pm module. The Errno module is expected to tie the %! hash to
1052 provide symbolic names for C<$!> errno values.
1054 =item Can't use %s for loop variable
1056 (F) Only a simple scalar variable may be used as a loop variable on a
1059 =item Can't use global %s in "my"
1061 (F) You tried to declare a magical variable as a lexical variable. This
1062 is not allowed, because the magic can be tied to only one location
1063 (namely the global variable) and it would be incredibly confusing to
1064 have variables in your program that looked like magical variables but
1067 =item Can't use "my %s" in sort comparison
1069 (F) The global variables $a and $b are reserved for sort comparisons.
1070 You mentioned $a or $b in the same line as the <=> or cmp operator,
1071 and the variable had earlier been declared as a lexical variable.
1072 Either qualify the sort variable with the package name, or rename the
1075 =item Can't use %s ref as %s ref
1077 (F) You've mixed up your reference types. You have to dereference a
1078 reference of the type needed. You can use the ref() function to
1079 test the type of the reference, if need be.
1081 =item Can't use string ("%s") as %s ref while "strict refs" in use
1083 (F) Only hard references are allowed by "strict refs". Symbolic
1084 references are disallowed. See L<perlref>.
1086 =item Can't use subscript on %s
1088 (F) The compiler tried to interpret a bracketed expression as a
1089 subscript. But to the left of the brackets was an expression that
1090 didn't look like an array reference, or anything else subscriptable.
1092 =item Can't use \%c to mean $%c in expression
1094 (W syntax) In an ordinary expression, backslash is a unary operator that
1095 creates a reference to its argument. The use of backslash to indicate a
1096 backreference to a matched substring is valid only as part of a regular
1097 expression pattern. Trying to do this in ordinary Perl code produces a
1098 value that prints out looking like SCALAR(0xdecaf). Use the $1 form
1101 =item Can't weaken a nonreference
1103 (F) You attempted to weaken something that was not a reference. Only
1104 references can be weakened.
1106 =item Can't x= to read-only value
1108 (F) You tried to repeat a constant value (often the undefined value)
1109 with an assignment operator, which implies modifying the value itself.
1110 Perhaps you need to copy the value to a temporary, and repeat that.
1112 =item Character in "C" format wrapped in pack
1118 where $x is either less than 0 or more than 255; the C<"C"> format is
1119 only for encoding native operating system characters (ASCII, EBCDIC,
1120 and so on) and not for Unicode characters, so Perl behaved as if you meant
1124 If you actually want to pack Unicode codepoints, use the C<"U"> format
1127 =item Character in "c" format wrapped in pack
1133 where $x is either less than -128 or more than 127; the C<"c"> format
1134 is only for encoding native operating system characters (ASCII, EBCDIC,
1135 and so on) and not for Unicode characters, so Perl behaved as if you meant
1137 pack("c", $x & 255);
1139 If you actually want to pack Unicode codepoints, use the C<"U"> format
1142 =item close() on unopened filehandle %s
1144 (W unopened) You tried to close a filehandle that was never opened.
1146 =item Code missing after '/'
1148 (F) You had a (sub-)template that ends with a '/'. There must be another
1149 template code following the slash. See L<perlfunc/pack>.
1151 =item %s: Command not found
1153 (A) You've accidentally run your script through B<csh> instead of Perl.
1154 Check the #! line, or manually feed your script into Perl yourself.
1156 =item Compilation failed in require
1158 (F) Perl could not compile a file specified in a C<require> statement.
1159 Perl uses this generic message when none of the errors that it
1160 encountered were severe enough to halt compilation immediately.
1162 =item Complex regular subexpression recursion limit (%d) exceeded
1164 (W regexp) The regular expression engine uses recursion in complex
1165 situations where back-tracking is required. Recursion depth is limited
1166 to 32766, or perhaps less in architectures where the stack cannot grow
1167 arbitrarily. ("Simple" and "medium" situations are handled without
1168 recursion and are not subject to a limit.) Try shortening the string
1169 under examination; looping in Perl code (e.g. with C<while>) rather than
1170 in the regular expression engine; or rewriting the regular expression so
1171 that it is simpler or backtracks less. (See L<perlfaq2> for information
1172 on I<Mastering Regular Expressions>.)
1174 =item cond_broadcast() called on unlocked variable
1176 (W threads) Within a thread-enabled program, you tried to call
1177 cond_broadcast() on a variable which wasn't locked. The cond_broadcast()
1178 function is used to wake up another thread that is waiting in a
1179 cond_wait(). To ensure that the signal isn't sent before the other thread
1180 has a chance to enter the wait, it is usual for the signaling thread to
1181 first wait for a lock on variable. This lock attempt will only succeed
1182 after the other thread has entered cond_wait() and thus relinquished the
1185 =item cond_signal() called on unlocked variable
1187 (W threads) Within a thread-enabled program, you tried to call
1188 cond_signal() on a variable which wasn't locked. The cond_signal()
1189 function is used to wake up another thread that is waiting in a
1190 cond_wait(). To ensure that the signal isn't sent before the other thread
1191 has a chance to enter the wait, it is usual for the signaling thread to
1192 first wait for a lock on variable. This lock attempt will only succeed
1193 after the other thread has entered cond_wait() and thus relinquished the
1196 =item connect() on closed socket %s
1198 (W closed) You tried to do a connect on a closed socket. Did you forget
1199 to check the return value of your socket() call? See
1200 L<perlfunc/connect>.
1202 =item Constant(%s)%s: %s
1204 (F) The parser found inconsistencies either while attempting to define
1205 an overloaded constant, or when trying to find the character name
1206 specified in the C<\N{...}> escape. Perhaps you forgot to load the
1207 corresponding C<overload> or C<charnames> pragma? See L<charnames> and
1210 =item Constant is not %s reference
1212 (F) A constant value (perhaps declared using the C<use constant> pragma)
1213 is being dereferenced, but it amounts to the wrong type of reference.
1214 The message indicates the type of reference that was expected. This
1215 usually indicates a syntax error in dereferencing the constant value.
1216 See L<perlsub/"Constant Functions"> and L<constant>.
1218 =item Constant subroutine %s redefined
1220 (S) You redefined a subroutine which had previously been
1221 eligible for inlining. See L<perlsub/"Constant Functions"> for
1222 commentary and workarounds.
1224 =item Constant subroutine %s undefined
1226 (W misc) You undefined a subroutine which had previously been eligible
1227 for inlining. See L<perlsub/"Constant Functions"> for commentary and
1230 =item Copy method did not return a reference
1232 (F) The method which overloads "=" is buggy. See
1233 L<overload/Copy Constructor>.
1235 =item CORE::%s is not a keyword
1237 (F) The CORE:: namespace is reserved for Perl keywords.
1239 =item corrupted regexp pointers
1241 (P) The regular expression engine got confused by what the regular
1242 expression compiler gave it.
1244 =item corrupted regexp program
1246 (P) The regular expression engine got passed a regexp program without a
1249 =item Corrupt malloc ptr 0x%lx at 0x%lx
1251 (P) The malloc package that comes with Perl had an internal failure.
1253 =item Count after length/code in unpack
1255 (F) You had an unpack template indicating a counted-length string, but
1256 you have also specified an explicit size for the string. See
1259 =item Deep recursion on subroutine "%s"
1261 (W recursion) This subroutine has called itself (directly or indirectly)
1262 100 times more than it has returned. This probably indicates an
1263 infinite recursion, unless you're writing strange benchmark programs, in
1264 which case it indicates something else.
1266 =item defined(@array) is deprecated
1268 (D deprecated) defined() is not usually useful on arrays because it
1269 checks for an undefined I<scalar> value. If you want to see if the
1270 array is empty, just use C<if (@array) { # not empty }> for example.
1272 =item defined(%hash) is deprecated
1274 (D deprecated) defined() is not usually useful on hashes because it
1275 checks for an undefined I<scalar> value. If you want to see if the hash
1276 is empty, just use C<if (%hash) { # not empty }> for example.
1278 =item %s defines neither package nor VERSION--version check failed
1280 (F) You said something like "use Module 42" but in the Module file
1281 there are neither package declarations nor a C<$VERSION>.
1283 =item Delimiter for here document is too long
1285 (F) In a here document construct like C<<<FOO>, the label C<FOO> is too
1286 long for Perl to handle. You have to be seriously twisted to write code
1287 that triggers this error.
1289 =item Did not produce a valid header
1293 =item %s did not return a true value
1295 (F) A required (or used) file must return a true value to indicate that
1296 it compiled correctly and ran its initialization code correctly. It's
1297 traditional to end such a file with a "1;", though any true value would
1298 do. See L<perlfunc/require>.
1300 =item (Did you mean &%s instead?)
1302 (W) You probably referred to an imported subroutine &FOO as $FOO or some
1305 =item (Did you mean "local" instead of "our"?)
1307 (W misc) Remember that "our" does not localize the declared global
1308 variable. You have declared it again in the same lexical scope, which
1311 =item (Did you mean $ or @ instead of %?)
1313 (W) You probably said %hash{$key} when you meant $hash{$key} or
1314 @hash{@keys}. On the other hand, maybe you just meant %hash and got
1319 (F) You passed die() an empty string (the equivalent of C<die "">) or
1320 you called it with no args and both C<$@> and C<$_> were empty.
1322 =item Document contains no data
1326 =item %s does not define %s::VERSION--version check failed
1328 (F) You said something like "use Module 42" but the Module did not
1329 define a C<$VERSION.>
1331 =item '/' does not take a repeat count
1333 (F) You cannot put a repeat count of any kind right after the '/' code.
1334 See L<perlfunc/pack>.
1336 =item Don't know how to handle magic of type '%s'
1338 (P) The internal handling of magical variables has been cursed.
1340 =item do_study: out of memory
1342 (P) This should have been caught by safemalloc() instead.
1344 =item (Do you need to predeclare %s?)
1346 (S) This is an educated guess made in conjunction with the message "%s
1347 found where operator expected". It often means a subroutine or module
1348 name is being referenced that hasn't been declared yet. This may be
1349 because of ordering problems in your file, or because of a missing
1350 "sub", "package", "require", or "use" statement. If you're referencing
1351 something that isn't defined yet, you don't actually have to define the
1352 subroutine or package before the current location. You can use an empty
1353 "sub foo;" or "package FOO;" to enter a "forward" declaration.
1355 =item dump() better written as CORE::dump()
1357 (W misc) You used the obsolescent C<dump()> built-in function, without fully
1358 qualifying it as C<CORE::dump()>. Maybe it's a typo. See L<perlfunc/dump>.
1360 =item Duplicate free() ignored
1362 (S malloc) An internal routine called free() on something that had
1365 =item elseif should be elsif
1367 (S) There is no keyword "elseif" in Perl because Larry thinks it's ugly.
1368 Your code will be interpreted as an attempt to call a method named
1369 "elseif" for the class returned by the following block. This is
1370 unlikely to be what you want.
1374 (F) C<\p> and C<\P> are used to introduce a named Unicode property, as
1375 described in L<perlunicode> and L<perlre>. You used C<\p> or C<\P> in
1376 a regular expression without specifying the property name.
1378 =item entering effective %s failed
1380 (F) While under the C<use filetest> pragma, switching the real and
1381 effective uids or gids failed.
1383 =item Error converting file specification %s
1385 (F) An error peculiar to VMS. Because Perl may have to deal with file
1386 specifications in either VMS or Unix syntax, it converts them to a
1387 single form when it must operate on them directly. Either you've passed
1388 an invalid file specification to Perl, or you've found a case the
1389 conversion routines don't handle. Drat.
1391 =item %s: Eval-group in insecure regular expression
1393 (F) Perl detected tainted data when trying to compile a regular
1394 expression that contains the C<(?{ ... })> zero-width assertion, which
1395 is unsafe. See L<perlre/(?{ code })>, and L<perlsec>.
1397 =item %s: Eval-group not allowed at run time
1399 (F) Perl tried to compile a regular expression containing the
1400 C<(?{ ... })> zero-width assertion at run time, as it would when the
1401 pattern contains interpolated values. Since that is a security risk, it
1402 is not allowed. If you insist, you may still do this by explicitly
1403 building the pattern from an interpolated string at run time and using
1404 that in an eval(). See L<perlre/(?{ code })>.
1406 =item %s: Eval-group not allowed, use re 'eval'
1408 (F) A regular expression contained the C<(?{ ... })> zero-width
1409 assertion, but that construct is only allowed when the C<use re 'eval'>
1410 pragma is in effect. See L<perlre/(?{ code })>.
1412 =item Excessively long <> operator
1414 (F) The contents of a <> operator may not exceed the maximum size of a
1415 Perl identifier. If you're just trying to glob a long list of
1416 filenames, try using the glob() operator, or put the filenames into a
1417 variable and glob that.
1419 =item exec? I'm not *that* kind of operating system
1421 (F) The C<exec> function is not implemented in MacPerl. See L<perlport>.
1423 =item Execution of %s aborted due to compilation errors
1425 (F) The final summary message when a Perl compilation fails.
1427 =item Exiting eval via %s
1429 (W exiting) You are exiting an eval by unconventional means, such as a
1430 goto, or a loop control statement.
1432 =item Exiting format via %s
1434 (W exiting) You are exiting a format by unconventional means, such as a
1435 goto, or a loop control statement.
1437 =item Exiting pseudo-block via %s
1439 (W exiting) You are exiting a rather special block construct (like a
1440 sort block or subroutine) by unconventional means, such as a goto, or a
1441 loop control statement. See L<perlfunc/sort>.
1443 =item Exiting subroutine via %s
1445 (W exiting) You are exiting a subroutine by unconventional means, such
1446 as a goto, or a loop control statement.
1448 =item Exiting substitution via %s
1450 (W exiting) You are exiting a substitution by unconventional means, such
1451 as a return, a goto, or a loop control statement.
1453 =item Explicit blessing to '' (assuming package main)
1455 (W misc) You are blessing a reference to a zero length string. This has
1456 the effect of blessing the reference into the package main. This is
1457 usually not what you want. Consider providing a default target package,
1458 e.g. bless($ref, $p || 'MyPackage');
1460 =item %s: Expression syntax
1462 (A) You've accidentally run your script through B<csh> instead of Perl.
1463 Check the #! line, or manually feed your script into Perl yourself.
1465 =item %s failed--call queue aborted
1467 (F) An untrapped exception was raised while executing a CHECK, INIT, or
1468 END subroutine. Processing of the remainder of the queue of such
1469 routines has been prematurely ended.
1471 =item False [] range "%s" in regex; marked by <-- HERE in m/%s/
1473 (W regexp) A character class range must start and end at a literal
1474 character, not another character class like C<\d> or C<[:alpha:]>. The "-"
1475 in your false range is interpreted as a literal "-". Consider quoting the
1476 "-", "\-". The <-- HERE shows in the regular expression about where the
1477 problem was discovered. See L<perlre>.
1479 =item Fatal VMS error at %s, line %d
1481 (P) An error peculiar to VMS. Something untoward happened in a VMS
1482 system service or RTL routine; Perl's exit status should provide more
1483 details. The filename in "at %s" and the line number in "line %d" tell
1484 you which section of the Perl source code is distressed.
1486 =item fcntl is not implemented
1488 (F) Your machine apparently doesn't implement fcntl(). What is this, a
1489 PDP-11 or something?
1491 =item Filehandle %s opened only for input
1493 (W io) You tried to write on a read-only filehandle. If you intended
1494 it to be a read-write filehandle, you needed to open it with "+<" or
1495 "+>" or "+>>" instead of with "<" or nothing. If you intended only to
1496 write the file, use ">" or ">>". See L<perlfunc/open>.
1498 =item Filehandle %s opened only for output
1500 (W io) You tried to read from a filehandle opened only for writing, If
1501 you intended it to be a read/write filehandle, you needed to open it
1502 with "+<" or "+>" or "+>>" instead of with "<" or nothing. If you
1503 intended only to read from the file, use "<". See L<perlfunc/open>.
1504 Another possibility is that you attempted to open filedescriptor 0
1505 (also known as STDIN) for output (maybe you closed STDIN earlier?).
1507 =item Filehandle %s reopened as %s only for input
1509 (W io) You opened for reading a filehandle that got the same filehandle id
1510 as STDOUT or STDERR. This occured because you closed STDOUT or STDERR
1513 =item Filehandle STDIN reopened as %s only for output
1515 (W io) You opened for writing a filehandle that got the same filehandle id
1516 as STDIN. This occured because you closed STDIN previously.
1518 =item Final $ should be \$ or $name
1520 (F) You must now decide whether the final $ in a string was meant to be
1521 a literal dollar sign, or was meant to introduce a variable name that
1522 happens to be missing. So you have to put either the backslash or the
1525 =item Final @ should be \@ or @name
1527 (F) You must now decide whether the final @ in a string was meant to be
1528 a literal "at" sign, or was meant to introduce a variable name that
1529 happens to be missing. So you have to put either the backslash or the
1532 =item flock() on closed filehandle %s
1534 (W closed) The filehandle you're attempting to flock() got itself closed
1535 some time before now. Check your control flow. flock() operates on
1536 filehandles. Are you attempting to call flock() on a dirhandle by the
1539 =item Format not terminated
1541 (F) A format must be terminated by a line with a solitary dot. Perl got
1542 to the end of your file without finding such a line.
1544 =item Format %s redefined
1546 (W redefine) You redefined a format. To suppress this warning, say
1549 no warnings 'redefine';
1550 eval "format NAME =...";
1553 =item Found = in conditional, should be ==
1563 (or something like that).
1565 =item %s found where operator expected
1567 (S) The Perl lexer knows whether to expect a term or an operator. If it
1568 sees what it knows to be a term when it was expecting to see an
1569 operator, it gives you this warning. Usually it indicates that an
1570 operator or delimiter was omitted, such as a semicolon.
1572 =item gdbm store returned %d, errno %d, key "%s"
1574 (S) A warning from the GDBM_File extension that a store failed.
1576 =item gethostent not implemented
1578 (F) Your C library apparently doesn't implement gethostent(), probably
1579 because if it did, it'd feel morally obligated to return every hostname
1582 =item get%sname() on closed socket %s
1584 (W closed) You tried to get a socket or peer socket name on a closed
1585 socket. Did you forget to check the return value of your socket() call?
1587 =item getpwnam returned invalid UIC %#o for user "%s"
1589 (S) A warning peculiar to VMS. The call to C<sys$getuai> underlying the
1590 C<getpwnam> operator returned an invalid UIC.
1592 =item getsockopt() on closed socket %s
1594 (W closed) You tried to get a socket option on a closed socket. Did you
1595 forget to check the return value of your socket() call? See
1596 L<perlfunc/getsockopt>.
1598 =item Global symbol "%s" requires explicit package name
1600 (F) You've said "use strict vars", which indicates that all variables
1601 must either be lexically scoped (using "my"), declared beforehand using
1602 "our", or explicitly qualified to say which package the global variable
1605 =item glob failed (%s)
1607 (W glob) Something went wrong with the external program(s) used for
1608 C<glob> and C<< <*.c> >>. Usually, this means that you supplied a
1609 C<glob> pattern that caused the external program to fail and exit with a
1610 nonzero status. If the message indicates that the abnormal exit
1611 resulted in a coredump, this may also mean that your csh (C shell) is
1612 broken. If so, you should change all of the csh-related variables in
1613 config.sh: If you have tcsh, make the variables refer to it as if it
1614 were csh (e.g. C<full_csh='/usr/bin/tcsh'>); otherwise, make them all
1615 empty (except that C<d_csh> should be C<'undef'>) so that Perl will
1616 think csh is missing. In either case, after editing config.sh, run
1617 C<./Configure -S> and rebuild Perl.
1619 =item Glob not terminated
1621 (F) The lexer saw a left angle bracket in a place where it was expecting
1622 a term, so it's looking for the corresponding right angle bracket, and
1623 not finding it. Chances are you left some needed parentheses out
1624 earlier in the line, and you really meant a "less than".
1626 =item Got an error from DosAllocMem
1628 (P) An error peculiar to OS/2. Most probably you're using an obsolete
1629 version of Perl, and this should not happen anyway.
1631 =item goto must have label
1633 (F) Unlike with "next" or "last", you're not allowed to goto an
1634 unspecified destination. See L<perlfunc/goto>.
1636 =item ()-group starts with a count
1638 (F) A ()-group started with a count. A count is
1639 supposed to follow something: a template character or a ()-group.
1640 See L<perlfunc/pack>.
1642 =item %s had compilation errors
1644 (F) The final summary message when a C<perl -c> fails.
1646 =item Had to create %s unexpectedly
1648 (S internal) A routine asked for a symbol from a symbol table that ought
1649 to have existed already, but for some reason it didn't, and had to be
1650 created on an emergency basis to prevent a core dump.
1652 =item Hash %%s missing the % in argument %d of %s()
1654 (D deprecated) Really old Perl let you omit the % on hash names in some
1655 spots. This is now heavily deprecated.
1657 =item %s has too many errors
1659 (F) The parser has given up trying to parse the program after 10 errors.
1660 Further error messages would likely be uninformative.
1662 =item Hexadecimal number > 0xffffffff non-portable
1664 (W portable) The hexadecimal number you specified is larger than 2**32-1
1665 (4294967295) and therefore non-portable between systems. See
1666 L<perlport> for more on portability concerns.
1668 =item Identifier too long
1670 (F) Perl limits identifiers (names for variables, functions, etc.) to
1671 about 250 characters for simple names, and somewhat more for compound
1672 names (like C<$A::B>). You've exceeded Perl's limits. Future versions
1673 of Perl are likely to eliminate these arbitrary limitations.
1675 =item Illegal binary digit %s
1677 (F) You used a digit other than 0 or 1 in a binary number.
1679 =item Illegal binary digit %s ignored
1681 (W digit) You may have tried to use a digit other than 0 or 1 in a
1682 binary number. Interpretation of the binary number stopped before the
1685 =item Illegal character %s (carriage return)
1687 (F) Perl normally treats carriage returns in the program text as it
1688 would any other whitespace, which means you should never see this error
1689 when Perl was built using standard options. For some reason, your
1690 version of Perl appears to have been built without this support. Talk
1691 to your Perl administrator.
1693 =item Illegal character in prototype for %s : %s
1695 (W syntax) An illegal character was found in a prototype declaration. Legal
1696 characters in prototypes are $, @, %, *, ;, [, ], &, and \.
1698 =item Illegal declaration of anonymous subroutine
1700 (F) When using the C<sub> keyword to construct an anonymous subroutine,
1701 you must always specify a block of code. See L<perlsub>.
1703 =item Illegal division by zero
1705 (F) You tried to divide a number by 0. Either something was wrong in
1706 your logic, or you need to put a conditional in to guard against
1709 =item Illegal hexadecimal digit %s ignored
1711 (W digit) You may have tried to use a character other than 0 - 9 or
1712 A - F, a - f in a hexadecimal number. Interpretation of the hexadecimal
1713 number stopped before the illegal character.
1715 =item Illegal modulus zero
1717 (F) You tried to divide a number by 0 to get the remainder. Most
1718 numbers don't take to this kindly.
1720 =item Illegal number of bits in vec
1722 (F) The number of bits in vec() (the third argument) must be a power of
1723 two from 1 to 32 (or 64, if your platform supports that).
1725 =item Illegal octal digit %s
1727 (F) You used an 8 or 9 in an octal number.
1729 =item Illegal octal digit %s ignored
1731 (W digit) You may have tried to use an 8 or 9 in an octal number.
1732 Interpretation of the octal number stopped before the 8 or 9.
1734 =item Illegal switch in PERL5OPT: %s
1736 (X) The PERL5OPT environment variable may only be used to set the
1737 following switches: B<-[DIMUdmtw]>.
1739 =item Ill-formed CRTL environ value "%s"
1741 (W internal) A warning peculiar to VMS. Perl tried to read the CRTL's
1742 internal environ array, and encountered an element without the C<=>
1743 delimiter used to separate keys from values. The element is ignored.
1745 =item Ill-formed message in prime_env_iter: |%s|
1747 (W internal) A warning peculiar to VMS. Perl tried to read a logical
1748 name or CLI symbol definition when preparing to iterate over %ENV, and
1749 didn't see the expected delimiter between key and value, so the line was
1752 =item Impossible to activate assertion call
1754 (W assertions) You're calling an assertion function in a block that is
1755 not under the control of the C<assertions> pragma.
1757 =item (in cleanup) %s
1759 (W misc) This prefix usually indicates that a DESTROY() method raised
1760 the indicated exception. Since destructors are usually called by the
1761 system at arbitrary points during execution, and often a vast number of
1762 times, the warning is issued only once for any number of failures that
1763 would otherwise result in the same message being repeated.
1765 Failure of user callbacks dispatched using the C<G_KEEPERR> flag could
1766 also result in this warning. See L<perlcall/G_KEEPERR>.
1768 =item In EBCDIC the v-string components cannot exceed 2147483647
1770 (F) An error peculiar to EBCDIC. Internally, v-strings are stored as
1771 Unicode code points, and encoded in EBCDIC as UTF-EBCDIC. The UTF-EBCDIC
1772 encoding is limited to code points no larger than 2147483647 (0x7FFFFFFF).
1774 =item Insecure dependency in %s
1776 (F) You tried to do something that the tainting mechanism didn't like.
1777 The tainting mechanism is turned on when you're running setuid or
1778 setgid, or when you specify B<-T> to turn it on explicitly. The
1779 tainting mechanism labels all data that's derived directly or indirectly
1780 from the user, who is considered to be unworthy of your trust. If any
1781 such data is used in a "dangerous" operation, you get this error. See
1782 L<perlsec> for more information.
1784 =item Insecure directory in %s
1786 (F) You can't use system(), exec(), or a piped open in a setuid or
1787 setgid script if C<$ENV{PATH}> contains a directory that is writable by
1788 the world. See L<perlsec>.
1790 =item Insecure $ENV{%s} while running %s
1792 (F) You can't use system(), exec(), or a piped open in a setuid or
1793 setgid script if any of C<$ENV{PATH}>, C<$ENV{IFS}>, C<$ENV{CDPATH}>,
1794 C<$ENV{ENV}>, C<$ENV{BASH_ENV}> or C<$ENV{TERM}> are derived from data
1795 supplied (or potentially supplied) by the user. The script must set
1796 the path to a known value, using trustworthy data. See L<perlsec>.
1798 =item Integer overflow in %s number
1800 (W overflow) The hexadecimal, octal or binary number you have specified
1801 either as a literal or as an argument to hex() or oct() is too big for
1802 your architecture, and has been converted to a floating point number.
1803 On a 32-bit architecture the largest hexadecimal, octal or binary number
1804 representable without overflow is 0xFFFFFFFF, 037777777777, or
1805 0b11111111111111111111111111111111 respectively. Note that Perl
1806 transparently promotes all numbers to a floating point representation
1807 internally--subject to loss of precision errors in subsequent
1810 =item Integer overflow in version
1812 (F) Some portion of a version initialization is too large for the
1813 size of integers for your architecture. This is not a warning
1814 because there is no rational reason for a version to try and use a
1815 element larger than typically 2**32. This is usually caused by
1816 trying to use some odd mathematical operation as a version, like
1819 =item Internal disaster in regex; marked by <-- HERE in m/%s/
1821 (P) Something went badly wrong in the regular expression parser.
1822 The <-- HERE shows in the regular expression about where the problem was
1825 =item Internal inconsistency in tracking vforks
1827 (S) A warning peculiar to VMS. Perl keeps track of the number of times
1828 you've called C<fork> and C<exec>, to determine whether the current call
1829 to C<exec> should affect the current script or a subprocess (see
1830 L<perlvms/"exec LIST">). Somehow, this count has become scrambled, so
1831 Perl is making a guess and treating this C<exec> as a request to
1832 terminate the Perl script and execute the specified command.
1834 =item Internal urp in regex; marked by <-- HERE in m/%s/
1836 (P) Something went badly awry in the regular expression parser. The
1837 <-- HERE shows in the regular expression about where the problem was
1840 =item %s (...) interpreted as function
1842 (W syntax) You've run afoul of the rule that says that any list operator
1843 followed by parentheses turns into a function, with all the list
1844 operators arguments found inside the parentheses. See
1845 L<perlop/Terms and List Operators (Leftward)>.
1847 =item Invalid %s attribute: %s
1849 The indicated attribute for a subroutine or variable was not recognized
1850 by Perl or by a user-supplied handler. See L<attributes>.
1852 =item Invalid %s attributes: %s
1854 The indicated attributes for a subroutine or variable were not
1855 recognized by Perl or by a user-supplied handler. See L<attributes>.
1857 =item Invalid conversion in %s: "%s"
1859 (W printf) Perl does not understand the given format conversion. See
1860 L<perlfunc/sprintf>.
1862 =item Invalid [] range "%s" in regex; marked by <-- HERE in m/%s/
1864 (F) The range specified in a character class had a minimum character
1865 greater than the maximum character. One possibility is that you forgot the
1866 C<{}> from your ending C<\x{}> - C<\x> without the curly braces can go only
1867 up to C<ff>. The <-- HERE shows in the regular expression about where the
1868 problem was discovered. See L<perlre>.
1870 =item Invalid range "%s" in transliteration operator
1872 (F) The range specified in the tr/// or y/// operator had a minimum
1873 character greater than the maximum character. See L<perlop>.
1875 =item Invalid separator character %s in attribute list
1877 (F) Something other than a colon or whitespace was seen between the
1878 elements of an attribute list. If the previous attribute had a
1879 parenthesised parameter list, perhaps that list was terminated too soon.
1882 =item Invalid type '%s' in %s
1884 (F) The given character is not a valid pack or unpack type.
1885 See L<perlfunc/pack>.
1886 (W) The given character is not a valid pack or unpack type but used to be
1889 =item Invalid version format (multiple underscores)
1891 (F) Versions may contain at most a single underscore, which signals
1892 that the version is a beta release. See L<version> for the allowed
1895 =item Invalid version format (underscores before decimal)
1897 (F) Versions may not contain decimals after the optional underscore.
1898 See L<version> for the allowed version formats.
1900 =item ioctl is not implemented
1902 (F) Your machine apparently doesn't implement ioctl(), which is pretty
1903 strange for a machine that supports C.
1905 =item ioctl() on unopened %s
1907 (W unopened) You tried ioctl() on a filehandle that was never opened.
1908 Check you control flow and number of arguments.
1910 =item IO::Socket::atmark not implemented on this architecture
1912 (F) Your machine doesn't implement the sockatmark() functionality,
1913 neither as a system call or an ioctl call (SIOCATMARK).
1915 =item `%s' is not a code reference
1917 (W overload) The second (fourth, sixth, ...) argument of overload::constant
1918 needs to be a code reference. Either an anonymous subroutine, or a reference
1921 =item `%s' is not an overloadable type
1923 (W overload) You tried to overload a constant type the overload package is
1926 =item junk on end of regexp
1928 (P) The regular expression parser is confused.
1930 =item Label not found for "last %s"
1932 (F) You named a loop to break out of, but you're not currently in a loop
1933 of that name, not even if you count where you were called from. See
1936 =item Label not found for "next %s"
1938 (F) You named a loop to continue, but you're not currently in a loop of
1939 that name, not even if you count where you were called from. See
1942 =item Label not found for "redo %s"
1944 (F) You named a loop to restart, but you're not currently in a loop of
1945 that name, not even if you count where you were called from. See
1948 =item leaving effective %s failed
1950 (F) While under the C<use filetest> pragma, switching the real and
1951 effective uids or gids failed.
1953 =item length/code after end of string in unpack
1955 (F) While unpacking, the string buffer was alread used up when an unpack
1956 length/code combination tried to obtain more data. This results in
1957 an undefined value for the length. See L<perlfunc/pack>.
1959 =item listen() on closed socket %s
1961 (W closed) You tried to do a listen on a closed socket. Did you forget
1962 to check the return value of your socket() call? See
1965 =item lstat() on filehandle %s
1967 (W io) You tried to do an lstat on a filehandle. What did you mean
1968 by that? lstat() makes sense only on filenames. (Perl did a fstat()
1969 instead on the filehandle.)
1971 =item Lookbehind longer than %d not implemented in regex; marked by <-- HERE in m/%s/
1973 (F) There is currently a limit on the length of string which lookbehind can
1974 handle. This restriction may be eased in a future release. The <-- HERE
1975 shows in the regular expression about where the problem was discovered.
1977 =item Lvalue subs returning %s not implemented yet
1979 (F) Due to limitations in the current implementation, array and hash
1980 values cannot be returned in subroutines used in lvalue context. See
1981 L<perlsub/"Lvalue subroutines">.
1983 =item Malformed integer in [] in pack
1985 (F) Between the brackets enclosing a numeric repeat count only digits
1986 are permitted. See L<perlfunc/pack>.
1988 =item Malformed integer in [] in unpack
1990 (F) Between the brackets enclosing a numeric repeat count only digits
1991 are permitted. See L<perlfunc/pack>.
1993 =item Malformed PERLLIB_PREFIX
1995 (F) An error peculiar to OS/2. PERLLIB_PREFIX should be of the form
2002 with nonempty prefix1 and prefix2. If C<prefix1> is indeed a prefix of
2003 a builtin library search path, prefix2 is substituted. The error may
2004 appear if components are not found, or are too long. See
2005 "PERLLIB_PREFIX" in L<perlos2>.
2007 =item Malformed prototype for %s: %s
2009 (F) You tried to use a function with a malformed prototype. The
2010 syntax of function prototypes is given a brief compile-time check for
2011 obvious errors like invalid characters. A more rigorous check is run
2012 when the function is called.
2014 =item Malformed UTF-8 character (%s)
2016 Perl detected something that didn't comply with UTF-8 encoding rules.
2018 One possible cause is that you read in data that you thought to be in
2019 UTF-8 but it wasn't (it was for example legacy 8-bit data). Another
2020 possibility is careless use of utf8::upgrade().
2022 =item Malformed UTF-16 surrogate
2024 Perl thought it was reading UTF-16 encoded character data but while
2025 doing it Perl met a malformed Unicode surrogate.
2027 =item %s matches null string many times in regex; marked by <-- HERE in m/%s/
2029 (W regexp) The pattern you've specified would be an infinite loop if the
2030 regular expression engine didn't specifically check for that. The <-- HERE
2031 shows in the regular expression about where the problem was discovered.
2034 =item "%s" may clash with future reserved word
2036 (W) This warning may be due to running a perl5 script through a perl4
2037 interpreter, especially if the word that is being warned about is
2040 =item % may not be used in pack
2042 (F) You can't pack a string by supplying a checksum, because the
2043 checksumming process loses information, and you can't go the other way.
2044 See L<perlfunc/unpack>.
2046 =item Method for operation %s not found in package %s during blessing
2048 (F) An attempt was made to specify an entry in an overloading table that
2049 doesn't resolve to a valid subroutine. See L<overload>.
2051 =item Method %s not permitted
2055 =item Might be a runaway multi-line %s string starting on line %d
2057 (S) An advisory indicating that the previous error may have been caused
2058 by a missing delimiter on a string or pattern, because it eventually
2059 ended earlier on the current line.
2061 =item Misplaced _ in number
2063 (W syntax) An underscore (underbar) in a numeric constant did not
2064 separate two digits.
2066 =item Missing %sbrace%s on \N{}
2068 (F) Wrong syntax of character name literal C<\N{charname}> within
2069 double-quotish context.
2071 =item Missing comma after first argument to %s function
2073 (F) While certain functions allow you to specify a filehandle or an
2074 "indirect object" before the argument list, this ain't one of them.
2076 =item Missing command in piped open
2078 (W pipe) You used the C<open(FH, "| command")> or
2079 C<open(FH, "command |")> construction, but the command was missing or
2082 =item Missing control char name in \c
2084 (F) A double-quoted string ended with "\c", without the required control
2087 =item Missing name in "my sub"
2089 (F) The reserved syntax for lexically scoped subroutines requires that
2090 they have a name with which they can be found.
2092 =item Missing $ on loop variable
2094 (F) Apparently you've been programming in B<csh> too much. Variables
2095 are always mentioned with the $ in Perl, unlike in the shells, where it
2096 can vary from one line to the next.
2098 =item (Missing operator before %s?)
2100 (S) This is an educated guess made in conjunction with the message "%s
2101 found where operator expected". Often the missing operator is a comma.
2103 =item Missing right brace on %s
2105 (F) Missing right brace in C<\p{...}> or C<\P{...}>.
2107 =item Missing right curly or square bracket
2109 (F) The lexer counted more opening curly or square brackets than closing
2110 ones. As a general rule, you'll find it's missing near the place you
2113 =item (Missing semicolon on previous line?)
2115 (S) This is an educated guess made in conjunction with the message "%s
2116 found where operator expected". Don't automatically put a semicolon on
2117 the previous line just because you saw this message.
2119 =item Modification of a read-only value attempted
2121 (F) You tried, directly or indirectly, to change the value of a
2122 constant. You didn't, of course, try "2 = 1", because the compiler
2123 catches that. But an easy way to do the same thing is:
2125 sub mod { $_[0] = 1 }
2128 Another way is to assign to a substr() that's off the end of the string.
2130 Yet another way is to assign to a C<foreach> loop I<VAR> when I<VAR>
2131 is aliased to a constant in the look I<LIST>:
2134 foreach my $n ($x, 2) {
2135 $n *= 2; # modifies the $x, but fails on attempt to modify the 2
2138 =item Modification of non-creatable array value attempted, %s
2140 (F) You tried to make an array value spring into existence, and the
2141 subscript was probably negative, even counting from end of the array
2144 =item Modification of non-creatable hash value attempted, %s
2146 (P) You tried to make a hash value spring into existence, and it
2147 couldn't be created for some peculiar reason.
2149 =item Module name must be constant
2151 (F) Only a bare module name is allowed as the first argument to a "use".
2153 =item Module name required with -%c option
2155 (F) The C<-M> or C<-m> options say that Perl should load some module, but
2156 you omitted the name of the module. Consult L<perlrun> for full details
2157 about C<-M> and C<-m>.
2159 =item More than one argument to open
2161 (F) The C<open> function has been asked to open multiple files. This
2162 can happen if you are trying to open a pipe to a command that takes a
2163 list of arguments, but have forgotten to specify a piped open mode.
2164 See L<perlfunc/open> for details.
2166 =item msg%s not implemented
2168 (F) You don't have System V message IPC on your system.
2170 =item Multidimensional syntax %s not supported
2172 (W syntax) Multidimensional arrays aren't written like C<$foo[1,2,3]>.
2173 They're written like C<$foo[1][2][3]>, as in C.
2175 =item '/' must be followed by 'a*', 'A*' or 'Z*'
2177 (F) You had a pack template indicating a counted-length string,
2178 Currently the only things that can have their length counted are a*, A*
2179 or Z*. See L<perlfunc/pack>.
2181 =item '/' must follow a numeric type in unpack
2183 (F) You had an unpack template that contained a '/', but this did not
2184 follow some unpack specification producing a numeric value.
2185 See L<perlfunc/pack>.
2187 =item "my sub" not yet implemented
2189 (F) Lexically scoped subroutines are not yet implemented. Don't try
2192 =item "my" variable %s can't be in a package
2194 (F) Lexically scoped variables aren't in a package, so it doesn't make
2195 sense to try to declare one with a package qualifier on the front. Use
2196 local() if you want to localize a package variable.
2198 =item Name "%s::%s" used only once: possible typo
2200 (W once) Typographical errors often show up as unique variable names.
2201 If you had a good reason for having a unique name, then just mention it
2202 again somehow to suppress the message. The C<our> declaration is
2203 provided for this purpose.
2205 =item Negative '/' count in unpack
2207 (F) The length count obtained from a length/code unpack operation was
2208 negative. See L<perlfunc/pack>.
2210 =item Negative length
2212 (F) You tried to do a read/write/send/recv operation with a buffer
2213 length that is less than 0. This is difficult to imagine.
2215 =item Negative offset to vec in lvalue context
2217 (F) When C<vec> is called in an lvalue context, the second argument must be
2218 greater than or equal to zero.
2220 =item Nested quantifiers in regex; marked by <-- HERE in m/%s/
2222 (F) You can't quantify a quantifier without intervening parentheses. So
2223 things like ** or +* or ?* are illegal. The <-- HERE shows in the regular
2224 expression about where the problem was discovered.
2226 Note that the minimal matching quantifiers, C<*?>, C<+?>, and
2227 C<??> appear to be nested quantifiers, but aren't. See L<perlre>.
2229 =item %s never introduced
2231 (S internal) The symbol in question was declared but somehow went out of
2232 scope before it could possibly have been used.
2234 =item No %s allowed while running setuid
2236 (F) Certain operations are deemed to be too insecure for a setuid or
2237 setgid script to even be allowed to attempt. Generally speaking there
2238 will be another way to do what you want that is, if not secure, at least
2239 securable. See L<perlsec>.
2241 =item No comma allowed after %s
2243 (F) A list operator that has a filehandle or "indirect object" is not
2244 allowed to have a comma between that and the following arguments.
2245 Otherwise it'd be just another one of the arguments.
2247 One possible cause for this is that you expected to have imported a
2248 constant to your name space with B<use> or B<import> while no such
2249 importing took place, it may for example be that your operating system
2250 does not support that particular constant. Hopefully you did use an
2251 explicit import list for the constants you expect to see, please see
2252 L<perlfunc/use> and L<perlfunc/import>. While an explicit import list
2253 would probably have caught this error earlier it naturally does not
2254 remedy the fact that your operating system still does not support that
2255 constant. Maybe you have a typo in the constants of the symbol import
2256 list of B<use> or B<import> or in the constant name at the line where
2257 this error was triggered?
2259 =item No command into which to pipe on command line
2261 (F) An error peculiar to VMS. Perl handles its own command line
2262 redirection, and found a '|' at the end of the command line, so it
2263 doesn't know where you want to pipe the output from this command.
2265 =item No DB::DB routine defined
2267 (F) The currently executing code was compiled with the B<-d> switch, but
2268 for some reason the perl5db.pl file (or some facsimile thereof) didn't
2269 define a routine to be called at the beginning of each statement. Which
2270 is odd, because the file should have been required automatically, and
2271 should have blown up the require if it didn't parse right.
2273 =item No dbm on this machine
2275 (P) This is counted as an internal error, because every machine should
2276 supply dbm nowadays, because Perl comes with SDBM. See L<SDBM_File>.
2278 =item No DBsub routine
2280 (F) The currently executing code was compiled with the B<-d> switch,
2281 but for some reason the perl5db.pl file (or some facsimile thereof)
2282 didn't define a DB::sub routine to be called at the beginning of each
2283 ordinary subroutine call.
2285 =item No B<-e> allowed in setuid scripts
2287 (F) A setuid script can't be specified by the user.
2289 =item No error file after 2> or 2>> on command line
2291 (F) An error peculiar to VMS. Perl handles its own command line
2292 redirection, and found a '2>' or a '2>>' on the command line, but can't
2293 find the name of the file to which to write data destined for stderr.
2295 =item No group ending character '%c' found in template
2297 (F) A pack or unpack template has an opening '(' or '[' without its
2298 matching counterpart. See L<perlfunc/pack>.
2300 =item No input file after < on command line
2302 (F) An error peculiar to VMS. Perl handles its own command line
2303 redirection, and found a '<' on the command line, but can't find the
2304 name of the file from which to read data for stdin.
2308 (F) The setuid emulator requires that scripts have a well-formed #! line
2309 even on machines that don't support the #! construct.
2311 =item "no" not allowed in expression
2313 (F) The "no" keyword is recognized and executed at compile time, and
2314 returns no useful value. See L<perlmod>.
2316 =item No output file after > on command line
2318 (F) An error peculiar to VMS. Perl handles its own command line
2319 redirection, and found a lone '>' at the end of the command line, so it
2320 doesn't know where you wanted to redirect stdout.
2322 =item No output file after > or >> on command line
2324 (F) An error peculiar to VMS. Perl handles its own command line
2325 redirection, and found a '>' or a '>>' on the command line, but can't
2326 find the name of the file to which to write data destined for stdout.
2328 =item No package name allowed for variable %s in "our"
2330 (F) Fully qualified variable names are not allowed in "our"
2331 declarations, because that doesn't make much sense under existing
2332 semantics. Such syntax is reserved for future extensions.
2334 =item No Perl script found in input
2336 (F) You called C<perl -x>, but no line was found in the file beginning
2337 with #! and containing the word "perl".
2339 =item No setregid available
2341 (F) Configure didn't find anything resembling the setregid() call for
2344 =item No setreuid available
2346 (F) Configure didn't find anything resembling the setreuid() call for
2349 =item No space allowed after -%c
2351 (F) The argument to the indicated command line switch must follow
2352 immediately after the switch, without intervening spaces.
2354 =item No %s specified for -%c
2356 (F) The indicated command line switch needs a mandatory argument, but
2357 you haven't specified one.
2359 =item No such class %s
2361 (F) You provided a class qualifier in a "my" or "our" declaration, but
2362 this class doesn't exist at this point in your program.
2364 =item No such pipe open
2366 (P) An error peculiar to VMS. The internal routine my_pclose() tried to
2367 close a pipe which hadn't been opened. This should have been caught
2368 earlier as an attempt to close an unopened filehandle.
2370 =item No such signal: SIG%s
2372 (W signal) You specified a signal name as a subscript to %SIG that was
2373 not recognized. Say C<kill -l> in your shell to see the valid signal
2374 names on your system.
2376 =item Not a CODE reference
2378 (F) Perl was trying to evaluate a reference to a code value (that is, a
2379 subroutine), but found a reference to something else instead. You can
2380 use the ref() function to find out what kind of ref it really was. See
2383 =item Not a format reference
2385 (F) I'm not sure how you managed to generate a reference to an anonymous
2386 format, but this indicates you did, and that it didn't exist.
2388 =item Not a GLOB reference
2390 (F) Perl was trying to evaluate a reference to a "typeglob" (that is, a
2391 symbol table entry that looks like C<*foo>), but found a reference to
2392 something else instead. You can use the ref() function to find out what
2393 kind of ref it really was. See L<perlref>.
2395 =item Not a HASH reference
2397 (F) Perl was trying to evaluate a reference to a hash value, but found a
2398 reference to something else instead. You can use the ref() function to
2399 find out what kind of ref it really was. See L<perlref>.
2401 =item Not an ARRAY reference
2403 (F) Perl was trying to evaluate a reference to an array value, but found
2404 a reference to something else instead. You can use the ref() function
2405 to find out what kind of ref it really was. See L<perlref>.
2407 =item Not a perl script
2409 (F) The setuid emulator requires that scripts have a well-formed #! line
2410 even on machines that don't support the #! construct. The line must
2413 =item Not a SCALAR reference
2415 (F) Perl was trying to evaluate a reference to a scalar value, but found
2416 a reference to something else instead. You can use the ref() function
2417 to find out what kind of ref it really was. See L<perlref>.
2419 =item Not a subroutine reference
2421 (F) Perl was trying to evaluate a reference to a code value (that is, a
2422 subroutine), but found a reference to something else instead. You can
2423 use the ref() function to find out what kind of ref it really was. See
2426 =item Not a subroutine reference in overload table
2428 (F) An attempt was made to specify an entry in an overloading table that
2429 doesn't somehow point to a valid subroutine. See L<overload>.
2431 =item Not enough arguments for %s
2433 (F) The function requires more arguments than you specified.
2435 =item Not enough format arguments
2437 (W syntax) A format specified more picture fields than the next line
2438 supplied. See L<perlform>.
2442 (A) You've accidentally run your script through the Bourne shell instead
2443 of Perl. Check the #! line, or manually feed your script into Perl
2446 =item no UTC offset information; assuming local time is UTC
2448 (S) A warning peculiar to VMS. Perl was unable to find the local
2449 timezone offset, so it's assuming that local system time is equivalent
2450 to UTC. If it's not, define the logical name
2451 F<SYS$TIMEZONE_DIFFERENTIAL> to translate to the number of seconds which
2452 need to be added to UTC to get local time.
2454 =item Null filename used
2456 (F) You can't require the null filename, especially because on many
2457 machines that means the current directory! See L<perlfunc/require>.
2459 =item NULL OP IN RUN
2461 (P debugging) Some internal routine called run() with a null opcode
2464 =item Null picture in formline
2466 (F) The first argument to formline must be a valid format picture
2467 specification. It was found to be empty, which probably means you
2468 supplied it an uninitialized value. See L<perlform>.
2472 (P) An attempt was made to realloc NULL.
2474 =item NULL regexp argument
2476 (P) The internal pattern matching routines blew it big time.
2478 =item NULL regexp parameter
2480 (P) The internal pattern matching routines are out of their gourd.
2482 =item Number too long
2484 (F) Perl limits the representation of decimal numbers in programs to
2485 about 250 characters. You've exceeded that length. Future
2486 versions of Perl are likely to eliminate this arbitrary limitation. In
2487 the meantime, try using scientific notation (e.g. "1e6" instead of
2490 =item Octal number in vector unsupported
2492 (F) Numbers with a leading C<0> are not currently allowed in vectors.
2493 The octal number interpretation of such numbers may be supported in a
2496 =item Octal number > 037777777777 non-portable
2498 (W portable) The octal number you specified is larger than 2**32-1
2499 (4294967295) and therefore non-portable between systems. See
2500 L<perlport> for more on portability concerns.
2502 See also L<perlport> for writing portable code.
2504 =item Odd number of arguments for overload::constant
2506 (W overload) The call to overload::constant contained an odd number of
2507 arguments. The arguments should come in pairs.
2509 =item Odd number of elements in anonymous hash
2511 (W misc) You specified an odd number of elements to initialize a hash,
2512 which is odd, because hashes come in key/value pairs.
2514 =item Odd number of elements in hash assignment
2516 (W misc) You specified an odd number of elements to initialize a hash,
2517 which is odd, because hashes come in key/value pairs.
2519 =item Offset outside string
2521 (F) You tried to do a read/write/send/recv operation with an offset
2522 pointing outside the buffer. This is difficult to imagine. The sole
2523 exception to this is that C<sysread()>ing past the buffer will extend
2524 the buffer and zero pad the new area.
2526 =item %s() on unopened %s
2528 (W unopened) An I/O operation was attempted on a filehandle that was
2529 never initialized. You need to do an open(), a sysopen(), or a socket()
2530 call, or call a constructor from the FileHandle package.
2532 =item -%s on unopened filehandle %s
2534 (W unopened) You tried to invoke a file test operator on a filehandle
2535 that isn't open. Check your control flow. See also L<perlfunc/-X>.
2539 (S internal) An internal warning that the grammar is screwed up.
2543 (S internal) An internal warning that the grammar is screwed up.
2545 =item Operation `%s': no method found, %s
2547 (F) An attempt was made to perform an overloaded operation for which no
2548 handler was defined. While some handlers can be autogenerated in terms
2549 of other handlers, there is no default handler for any operation, unless
2550 C<fallback> overloading key is specified to be true. See L<overload>.
2552 =item Operator or semicolon missing before %s
2554 (S ambiguous) You used a variable or subroutine call where the parser
2555 was expecting an operator. The parser has assumed you really meant to
2556 use an operator, but this is highly likely to be incorrect. For
2557 example, if you say "*foo *foo" it will be interpreted as if you said
2560 =item "our" variable %s redeclared
2562 (W misc) You seem to have already declared the same global once before
2563 in the current lexical scope.
2565 =item Out of memory!
2567 (X) The malloc() function returned 0, indicating there was insufficient
2568 remaining memory (or virtual memory) to satisfy the request. Perl has
2569 no option but to exit immediately.
2571 At least in Unix you may be able to get past this by increasing your
2572 process datasize limits: in csh/tcsh use C<limit> and
2573 C<limit datasize n> (where C<n> is the number of kilobytes) to check
2574 the current limits and change them, and in ksh/bash/zsh use C<ulimit -a>
2575 and C<ulimit -d n>, respectively.
2577 =item Out of memory during "large" request for %s
2579 (F) The malloc() function returned 0, indicating there was insufficient
2580 remaining memory (or virtual memory) to satisfy the request. However,
2581 the request was judged large enough (compile-time default is 64K), so a
2582 possibility to shut down by trapping this error is granted.
2584 =item Out of memory during request for %s
2586 (X|F) The malloc() function returned 0, indicating there was
2587 insufficient remaining memory (or virtual memory) to satisfy the
2590 The request was judged to be small, so the possibility to trap it
2591 depends on the way perl was compiled. By default it is not trappable.
2592 However, if compiled for this, Perl may use the contents of C<$^M> as an
2593 emergency pool after die()ing with this message. In this case the error
2594 is trappable I<once>, and the error message will include the line and file
2595 where the failed request happened.
2597 =item Out of memory during ridiculously large request
2599 (F) You can't allocate more than 2^31+"small amount" bytes. This error
2600 is most likely to be caused by a typo in the Perl program. e.g.,
2601 C<$arr[time]> instead of C<$arr[$time]>.
2603 =item Out of memory for yacc stack
2605 (F) The yacc parser wanted to grow its stack so it could continue
2606 parsing, but realloc() wouldn't give it more memory, virtual or
2609 =item '@' outside of string in unpack
2611 (F) You had a template that specified an absolute position outside
2612 the string being unpacked. See L<perlfunc/pack>.
2614 =item %s package attribute may clash with future reserved word: %s
2616 (W reserved) A lowercase attribute name was used that had a
2617 package-specific handler. That name might have a meaning to Perl itself
2618 some day, even though it doesn't yet. Perhaps you should use a
2619 mixed-case attribute name, instead. See L<attributes>.
2621 =item pack/unpack repeat count overflow
2623 (F) You can't specify a repeat count so large that it overflows your
2624 signed integers. See L<perlfunc/pack>.
2628 (W io) A single call to write() produced more lines than can fit on a
2629 page. See L<perlform>.
2633 (P) An internal error.
2635 =item panic: ck_grep
2637 (P) Failed an internal consistency check trying to compile a grep.
2639 =item panic: ck_split
2641 (P) Failed an internal consistency check trying to compile a split.
2643 =item panic: corrupt saved stack index
2645 (P) The savestack was requested to restore more localized values than
2646 there are in the savestack.
2648 =item panic: del_backref
2650 (P) Failed an internal consistency check while trying to reset a weak
2655 (P) We popped the context stack to an eval context, and then discovered
2656 it wasn't an eval context.
2658 =item panic: do_subst
2660 (P) The internal pp_subst() routine was called with invalid operational
2663 =item panic: do_trans_%s
2665 (P) The internal do_trans routines were called with invalid operational
2670 (P) The library function frexp() failed, making printf("%f") impossible.
2674 (P) We popped the context stack to a context with the specified label,
2675 and then discovered it wasn't a context we know how to do a goto in.
2677 =item panic: INTERPCASEMOD
2679 (P) The lexer got into a bad state at a case modifier.
2681 =item panic: INTERPCONCAT
2683 (P) The lexer got into a bad state parsing a string with brackets.
2685 =item panic: kid popen errno read
2687 (F) forked child returned an incomprehensible message about its errno.
2691 (P) We popped the context stack to a block context, and then discovered
2692 it wasn't a block context.
2694 =item panic: leave_scope clearsv
2696 (P) A writable lexical variable became read-only somehow within the
2699 =item panic: leave_scope inconsistency
2701 (P) The savestack probably got out of sync. At least, there was an
2702 invalid enum on the top of it.
2704 =item panic: magic_killbackrefs
2706 (P) Failed an internal consistency check while trying to reset all weak
2707 references to an object.
2711 (P) Something requested a negative number of bytes of malloc.
2713 =item panic: mapstart
2715 (P) The compiler is screwed up with respect to the map() function.
2717 =item panic: null array
2719 (P) One of the internal array routines was passed a null AV pointer.
2721 =item panic: pad_alloc
2723 (P) The compiler got confused about which scratch pad it was allocating
2724 and freeing temporaries and lexicals from.
2726 =item panic: pad_free curpad
2728 (P) The compiler got confused about which scratch pad it was allocating
2729 and freeing temporaries and lexicals from.
2731 =item panic: pad_free po
2733 (P) An invalid scratch pad offset was detected internally.
2735 =item panic: pad_reset curpad
2737 (P) The compiler got confused about which scratch pad it was allocating
2738 and freeing temporaries and lexicals from.
2740 =item panic: pad_sv po
2742 (P) An invalid scratch pad offset was detected internally.
2744 =item panic: pad_swipe curpad
2746 (P) The compiler got confused about which scratch pad it was allocating
2747 and freeing temporaries and lexicals from.
2749 =item panic: pad_swipe po
2751 (P) An invalid scratch pad offset was detected internally.
2753 =item panic: pp_iter
2755 (P) The foreach iterator got called in a non-loop context frame.
2757 =item panic: pp_match%s
2759 (P) The internal pp_match() routine was called with invalid operational
2762 =item panic: pp_split
2764 (P) Something terrible went wrong in setting up for the split.
2766 =item panic: realloc
2768 (P) Something requested a negative number of bytes of realloc.
2770 =item panic: restartop
2772 (P) Some internal routine requested a goto (or something like it), and
2773 didn't supply the destination.
2777 (P) We popped the context stack to a subroutine or eval context, and
2778 then discovered it wasn't a subroutine or eval context.
2780 =item panic: scan_num
2782 (P) scan_num() got called on something that wasn't a number.
2784 =item panic: sv_insert
2786 (P) The sv_insert() routine was told to remove more string than there
2789 =item panic: top_env
2791 (P) The compiler attempted to do a goto, or something weird like that.
2795 (P) The lexer got into a bad state while processing a case modifier.
2797 =item panic: utf16_to_utf8: odd bytelen
2799 (P) Something tried to call utf16_to_utf8 with an odd (as opposed
2800 to even) byte length.
2802 =item Parentheses missing around "%s" list
2804 (W parenthesis) You said something like
2810 my ($foo, $bar) = @_;
2812 Remember that "my", "our", and "local" bind tighter than comma.
2814 =item C<-p> destination: %s
2816 (F) An error occurred during the implicit output invoked by the C<-p>
2817 command-line switch. (This output goes to STDOUT unless you've
2818 redirected it with select().)
2820 =item (perhaps you forgot to load "%s"?)
2822 (F) This is an educated guess made in conjunction with the message
2823 "Can't locate object method \"%s\" via package \"%s\"". It often means
2824 that a method requires a package that has not been loaded.
2826 =item perlio: argument list not closed for layer "%s"
2828 (W layer) When pushing a layer with arguments onto the Perl I/O system you
2829 forgot the ) that closes the argument list. (Layers take care of transforming
2830 data between external and internal representations.) Perl stopped parsing
2831 the layer list at this point and did not attempt to push this layer.
2832 If your program didn't explicitly request the failing operation, it may be
2833 the result of the value of the environment variable PERLIO.
2835 =item perlio: invalid separator character %s in layer specification list %s
2837 (W layer) When pushing layers onto the Perl I/O system, something other than a
2838 colon or whitespace was seen between the elements of a layer list.
2839 If the previous attribute had a parenthesised parameter list, perhaps that
2840 list was terminated too soon.
2842 =item perlio: unknown layer "%s"
2844 (W layer) An attempt was made to push an unknown layer onto the Perl I/O
2845 system. (Layers take care of transforming data between external and
2846 internal representations.) Note that some layers, such as C<mmap>,
2847 are not supported in all environments. If your program didn't
2848 explicitly request the failing operation, it may be the result of the
2849 value of the environment variable PERLIO.
2851 =item Perl %s required--this is only version %s, stopped
2853 (F) The module in question uses features of a version of Perl more
2854 recent than the currently running version. How long has it been since
2855 you upgraded, anyway? See L<perlfunc/require>.
2857 =item PERL_SH_DIR too long
2859 (F) An error peculiar to OS/2. PERL_SH_DIR is the directory to find the
2860 C<sh>-shell in. See "PERL_SH_DIR" in L<perlos2>.
2862 =item PERL_SIGNALS illegal: "%s"
2864 See L<perlrun/PERL_SIGNALS> for legal values.
2866 =item perl: warning: Setting locale failed.
2868 (S) The whole warning message will look something like:
2870 perl: warning: Setting locale failed.
2871 perl: warning: Please check that your locale settings:
2874 are supported and installed on your system.
2875 perl: warning: Falling back to the standard locale ("C").
2877 Exactly what were the failed locale settings varies. In the above the
2878 settings were that the LC_ALL was "En_US" and the LANG had no value.
2879 This error means that Perl detected that you and/or your operating
2880 system supplier and/or system administrator have set up the so-called
2881 locale system but Perl could not use those settings. This was not
2882 dead serious, fortunately: there is a "default locale" called "C" that
2883 Perl can and will use, the script will be run. Before you really fix
2884 the problem, however, you will get the same error message each time
2885 you run Perl. How to really fix the problem can be found in
2886 L<perllocale> section B<LOCALE PROBLEMS>.
2888 =item Permission denied
2890 (F) The setuid emulator in suidperl decided you were up to no good.
2892 =item pid %x not a child
2894 (W exec) A warning peculiar to VMS. Waitpid() was asked to wait for a
2895 process which isn't a subprocess of the current process. While this is
2896 fine from VMS' perspective, it's probably not what you intended.
2898 =item 'P' must have an explicit size in unpack
2900 (F) The unpack format P must have an explicit size, not "*".
2902 =item B<-P> not allowed for setuid/setgid script
2904 (F) The script would have to be opened by the C preprocessor by name,
2905 which provides a race condition that breaks security.
2907 =item POSIX class [:%s:] unknown in regex; marked by <-- HERE in m/%s/
2909 (F) The class in the character class [: :] syntax is unknown. The <-- HERE
2910 shows in the regular expression about where the problem was discovered.
2911 Note that the POSIX character classes do B<not> have the C<is> prefix
2912 the corresponding C interfaces have: in other words, it's C<[[:print:]]>,
2913 not C<isprint>. See L<perlre>.
2915 =item POSIX getpgrp can't take an argument
2917 (F) Your system has POSIX getpgrp(), which takes no argument, unlike
2918 the BSD version, which takes a pid.
2920 =item POSIX syntax [%s] belongs inside character classes in regex; marked by <-- HERE in m/%s/
2922 (W regexp) The character class constructs [: :], [= =], and [. .] go
2923 I<inside> character classes, the [] are part of the construct, for example:
2924 /[012[:alpha:]345]/. Note that [= =] and [. .] are not currently
2925 implemented; they are simply placeholders for future extensions and will
2926 cause fatal errors. The <-- HERE shows in the regular expression about
2927 where the problem was discovered. See L<perlre>.
2929 =item POSIX syntax [. .] is reserved for future extensions in regex; marked by <-- HERE in m/%s/
2931 (F regexp) Within regular expression character classes ([]) the syntax
2932 beginning with "[." and ending with ".]" is reserved for future extensions.
2933 If you need to represent those character sequences inside a regular
2934 expression character class, just quote the square brackets with the
2935 backslash: "\[." and ".\]". The <-- HERE shows in the regular expression
2936 about where the problem was discovered. See L<perlre>.
2938 =item POSIX syntax [= =] is reserved for future extensions in regex; marked by <-- HERE in m/%s/
2940 (F) Within regular expression character classes ([]) the syntax beginning
2941 with "[=" and ending with "=]" is reserved for future extensions. If you
2942 need to represent those character sequences inside a regular expression
2943 character class, just quote the square brackets with the backslash: "\[="
2944 and "=\]". The <-- HERE shows in the regular expression about where the
2945 problem was discovered. See L<perlre>.
2947 =item Possible attempt to put comments in qw() list
2949 (W qw) qw() lists contain items separated by whitespace; as with literal
2950 strings, comment characters are not ignored, but are instead treated as
2951 literal data. (You may have used different delimiters than the
2952 parentheses shown here; braces are also frequently used.)
2954 You probably wrote something like this:
2961 when you should have written this:
2968 If you really want comments, build your list the
2969 old-fashioned way, with quotes and commas:
2973 'b', # another comment
2976 =item Possible attempt to separate words with commas
2978 (W qw) qw() lists contain items separated by whitespace; therefore
2979 commas aren't needed to separate the items. (You may have used
2980 different delimiters than the parentheses shown here; braces are also
2983 You probably wrote something like this:
2987 which puts literal commas into some of the list items. Write it without
2988 commas if you don't want them to appear in your data:
2992 =item Possible memory corruption: %s overflowed 3rd argument
2994 (F) An ioctl() or fcntl() returned more than Perl was bargaining for.
2995 Perl guesses a reasonable buffer size, but puts a sentinel byte at the
2996 end of the buffer just in case. This sentinel byte got clobbered, and
2997 Perl assumes that memory is now corrupted. See L<perlfunc/ioctl>.
2999 =item Possible precedence problem on bitwise %c operator
3001 (W precedence) Your program uses a bitwise logical operator in conjunction
3002 with a numeric comparison operator, like this :
3004 if ($x & $y == 0) { ... }
3006 This expression is actually equivalent to C<$x & ($y == 0)>, due to the
3007 higher precedence of C<==>. This is probably not what you want. (If you
3008 really meant to write this, disable the warning, or, better, write
3009 C<$x & ($y == 0 ? 1 : 0)>).
3011 =item Possible unintended interpolation of %s in string
3013 (W ambiguous) You said something like `@foo' in a double-quoted string
3014 but there was no array C<@foo> in scope at the time. If you wanted a
3015 literal @foo, then write it as \@foo; otherwise find out what happened
3016 to the array you apparently lost track of.
3018 =item Possible Y2K bug: %s
3020 (W y2k) You are concatenating the number 19 with another number, which
3021 could be a potential Year 2000 problem.
3023 =item pragma "attrs" is deprecated, use "sub NAME : ATTRS" instead
3025 (D deprecated) You have written something like this:
3029 use attrs qw(locked);
3032 You should use the new declaration syntax instead.
3038 The C<use attrs> pragma is now obsolete, and is only provided for
3039 backward-compatibility. See L<perlsub/"Subroutine Attributes">.
3041 =item Precedence problem: open %s should be open(%s)
3043 (S precedence) The old irregular construct
3047 is now misinterpreted as
3051 because of the strict regularization of Perl 5's grammar into unary and
3052 list operators. (The old open was a little of both.) You must put
3053 parentheses around the filehandle, or use the new "or" operator instead
3056 =item Premature end of script headers
3060 =item printf() on closed filehandle %s
3062 (W closed) The filehandle you're writing to got itself closed sometime
3063 before now. Check your control flow.
3065 =item print() on closed filehandle %s
3067 (W closed) The filehandle you're printing on got itself closed sometime
3068 before now. Check your control flow.
3070 =item Process terminated by SIG%s
3072 (W) This is a standard message issued by OS/2 applications, while *nix
3073 applications die in silence. It is considered a feature of the OS/2
3074 port. One can easily disable this by appropriate sighandlers, see
3075 L<perlipc/"Signals">. See also "Process terminated by SIGTERM/SIGINT"
3078 =item Prototype mismatch: %s vs %s
3080 (S prototype) The subroutine being declared or defined had previously been
3081 declared or defined with a different function prototype.
3083 =item Prototype not terminated
3085 (F) You've omitted the closing parenthesis in a function prototype
3088 =item Quantifier follows nothing in regex; marked by <-- HERE in m/%s/
3090 (F) You started a regular expression with a quantifier. Backslash it if you
3091 meant it literally. The <-- HERE shows in the regular expression about
3092 where the problem was discovered. See L<perlre>.
3094 =item Quantifier in {,} bigger than %d in regex; marked by <-- HERE in m/%s/
3096 (F) There is currently a limit to the size of the min and max values of the
3097 {min,max} construct. The <-- HERE shows in the regular expression about where
3098 the problem was discovered. See L<perlre>.
3100 =item Quantifier unexpected on zero-length expression; marked by <-- HERE in m/%s/
3102 (W regexp) You applied a regular expression quantifier in a place where
3103 it makes no sense, such as on a zero-width assertion. Try putting the
3104 quantifier inside the assertion instead. For example, the way to match
3105 "abc" provided that it is followed by three repetitions of "xyz" is
3106 C</abc(?=(?:xyz){3})/>, not C</abc(?=xyz){3}/>.
3108 The <-- HERE shows in the regular expression about where the problem was
3111 =item Range iterator outside integer range
3113 (F) One (or both) of the numeric arguments to the range operator ".."
3114 are outside the range which can be represented by integers internally.
3115 One possible workaround is to force Perl to use magical string increment
3116 by prepending "0" to your numbers.
3118 =item readline() on closed filehandle %s
3120 (W closed) The filehandle you're reading from got itself closed sometime
3121 before now. Check your control flow.
3123 =item read() on closed filehandle %s
3125 (W closed) You tried to read from a closed filehandle.
3127 =item read() on unopened filehandle %s
3129 (W unopened) You tried to read from a filehandle that was never opened.
3131 =item Reallocation too large: %lx
3133 (F) You can't allocate more than 64K on an MS-DOS machine.
3135 =item realloc() of freed memory ignored
3137 (S malloc) An internal routine called realloc() on something that had
3140 =item Recompile perl with B<-D>DEBUGGING to use B<-D> switch
3142 (F debugging) You can't use the B<-D> option unless the code to produce
3143 the desired output is compiled into Perl, which entails some overhead,
3144 which is why it's currently left out of your copy.
3146 =item Recursive inheritance detected in package '%s'
3148 (F) More than 100 levels of inheritance were used. Probably indicates
3149 an unintended loop in your inheritance hierarchy.
3151 =item Recursive inheritance detected while looking for method %s
3153 (F) More than 100 levels of inheritance were encountered while invoking
3154 a method. Probably indicates an unintended loop in your inheritance
3157 =item Reference found where even-sized list expected
3159 (W misc) You gave a single reference where Perl was expecting a list
3160 with an even number of elements (for assignment to a hash). This usually
3161 means that you used the anon hash constructor when you meant to use
3162 parens. In any case, a hash requires key/value B<pairs>.
3164 %hash = { one => 1, two => 2, }; # WRONG
3165 %hash = [ qw/ an anon array / ]; # WRONG
3166 %hash = ( one => 1, two => 2, ); # right
3167 %hash = qw( one 1 two 2 ); # also fine
3169 =item Reference is already weak
3171 (W misc) You have attempted to weaken a reference that is already weak.
3172 Doing so has no effect.
3174 =item Reference miscount in sv_replace()
3176 (W internal) The internal sv_replace() function was handed a new SV with
3177 a reference count of other than 1.
3179 =item Reference to nonexistent group in regex; marked by <-- HERE in m/%s/
3181 (F) You used something like C<\7> in your regular expression, but there are
3182 not at least seven sets of capturing parentheses in the expression. If you
3183 wanted to have the character with value 7 inserted into the regular expression,
3184 prepend a zero to make the number at least two digits: C<\07>
3186 The <-- HERE shows in the regular expression about where the problem was
3189 =item regexp memory corruption
3191 (P) The regular expression engine got confused by what the regular
3192 expression compiler gave it.
3194 =item Regexp out of space
3196 (P) A "can't happen" error, because safemalloc() should have caught it
3199 =item Reversed %s= operator
3201 (W syntax) You wrote your assignment operator backwards. The = must
3202 always comes last, to avoid ambiguity with subsequent unary operators.
3204 =item Runaway format
3206 (F) Your format contained the ~~ repeat-until-blank sequence, but it
3207 produced 200 lines at once, and the 200th line looked exactly like the
3208 199th line. Apparently you didn't arrange for the arguments to exhaust
3209 themselves, either by using ^ instead of @ (for scalar variables), or by
3210 shifting or popping (for array variables). See L<perlform>.
3212 =item Scalars leaked: %d
3214 (P) Something went wrong in Perl's internal bookkeeping of scalars:
3215 not all scalar variables were deallocated by the time Perl exited.
3216 What this usually indicates is a memory leak, which is of course bad,
3217 especially if the Perl program is intended to be long-running.
3219 =item Scalar value @%s[%s] better written as $%s[%s]
3221 (W syntax) You've used an array slice (indicated by @) to select a
3222 single element of an array. Generally it's better to ask for a scalar
3223 value (indicated by $). The difference is that C<$foo[&bar]> always
3224 behaves like a scalar, both when assigning to it and when evaluating its
3225 argument, while C<@foo[&bar]> behaves like a list when you assign to it,
3226 and provides a list context to its subscript, which can do weird things
3227 if you're expecting only one subscript.
3229 On the other hand, if you were actually hoping to treat the array
3230 element as a list, you need to look into how references work, because
3231 Perl will not magically convert between scalars and lists for you. See
3234 =item Scalar value @%s{%s} better written as $%s{%s}
3236 (W syntax) You've used a hash slice (indicated by @) to select a single
3237 element of a hash. Generally it's better to ask for a scalar value
3238 (indicated by $). The difference is that C<$foo{&bar}> always behaves
3239 like a scalar, both when assigning to it and when evaluating its
3240 argument, while C<@foo{&bar}> behaves like a list when you assign to it,
3241 and provides a list context to its subscript, which can do weird things
3242 if you're expecting only one subscript.
3244 On the other hand, if you were actually hoping to treat the hash element
3245 as a list, you need to look into how references work, because Perl will
3246 not magically convert between scalars and lists for you. See
3249 =item Script is not setuid/setgid in suidperl
3251 (F) Oddly, the suidperl program was invoked on a script without a setuid
3252 or setgid bit set. This doesn't make much sense.
3254 =item Search pattern not terminated
3256 (F) The lexer couldn't find the final delimiter of a // or m{}
3257 construct. Remember that bracketing delimiters count nesting level.
3258 Missing the leading C<$> from a variable C<$m> may cause this error.
3260 Note that since Perl 5.9.0 a // can also be the I<defined-or>
3261 construct, not just the empty search pattern. Therefore code written
3262 in Perl 5.9.0 or later that uses the // as the I<defined-or> can be
3263 misparsed by pre-5.9.0 Perls as a non-terminated search pattern.
3265 =item %sseek() on unopened filehandle
3267 (W unopened) You tried to use the seek() or sysseek() function on a
3268 filehandle that was either never opened or has since been closed.
3270 =item select not implemented
3272 (F) This machine doesn't implement the select() system call.
3274 =item Self-ties of arrays and hashes are not supported
3276 (F) Self-ties are of arrays and hashes are not supported in
3277 the current implementation.
3279 =item Semicolon seems to be missing
3281 (W semicolon) A nearby syntax error was probably caused by a missing
3282 semicolon, or possibly some other missing operator, such as a comma.
3284 =item semi-panic: attempt to dup freed string
3286 (S internal) The internal newSVsv() routine was called to duplicate a
3287 scalar that had previously been marked as free.
3289 =item sem%s not implemented
3291 (F) You don't have System V semaphore IPC on your system.
3293 =item send() on closed socket %s
3295 (W closed) The socket you're sending to got itself closed sometime
3296 before now. Check your control flow.
3298 =item Sequence (? incomplete in regex; marked by <-- HERE in m/%s/
3300 (F) A regular expression ended with an incomplete extension (?. The <-- HERE
3301 shows in the regular expression about where the problem was discovered. See
3304 =item Sequence (?%s...) not implemented in regex; marked by <-- HERE in m/%s/
3306 (F) A proposed regular expression extension has the character reserved but
3307 has not yet been written. The <-- HERE shows in the regular expression about
3308 where the problem was discovered. See L<perlre>.
3310 =item Sequence (?%s...) not recognized in regex; marked by <-- HERE in m/%s/
3312 (F) You used a regular expression extension that doesn't make sense. The
3313 <-- HERE shows in the regular expression about where the problem was
3314 discovered. See L<perlre>.
3316 =item Sequence (?#... not terminated in regex; marked by <-- HERE in m/%s/
3318 (F) A regular expression comment must be terminated by a closing
3319 parenthesis. Embedded parentheses aren't allowed. The <-- HERE shows in
3320 the regular expression about where the problem was discovered. See
3323 =item Sequence (?{...}) not terminated or not {}-balanced in regex; marked by <-- HERE in m/%s/
3325 (F) If the contents of a (?{...}) clause contains braces, they must balance
3326 for Perl to properly detect the end of the clause. The <-- HERE shows in
3327 the regular expression about where the problem was discovered. See
3330 =item 500 Server error
3336 This is the error message generally seen in a browser window when trying
3337 to run a CGI program (including SSI) over the web. The actual error text
3338 varies widely from server to server. The most frequently-seen variants
3339 are "500 Server error", "Method (something) not permitted", "Document
3340 contains no data", "Premature end of script headers", and "Did not
3341 produce a valid header".
3343 B<This is a CGI error, not a Perl error>.
3345 You need to make sure your script is executable, is accessible by the
3346 user CGI is running the script under (which is probably not the user
3347 account you tested it under), does not rely on any environment variables
3348 (like PATH) from the user it isn't running under, and isn't in a
3349 location where the CGI server can't find it, basically, more or less.
3350 Please see the following for more information:
3352 http://www.perl.org/CGI_MetaFAQ.html
3353 http://www.htmlhelp.org/faq/cgifaq.html
3354 http://www.w3.org/Security/Faq/
3356 You should also look at L<perlfaq9>.
3358 =item setegid() not implemented
3360 (F) You tried to assign to C<$)>, and your operating system doesn't
3361 support the setegid() system call (or equivalent), or at least Configure
3364 =item seteuid() not implemented
3366 (F) You tried to assign to C<< $> >>, and your operating system doesn't
3367 support the seteuid() system call (or equivalent), or at least Configure
3370 =item setpgrp can't take arguments
3372 (F) Your system has the setpgrp() from BSD 4.2, which takes no
3373 arguments, unlike POSIX setpgid(), which takes a process ID and process
3376 =item setrgid() not implemented
3378 (F) You tried to assign to C<$(>, and your operating system doesn't
3379 support the setrgid() system call (or equivalent), or at least Configure
3382 =item setruid() not implemented
3384 (F) You tried to assign to C<$<>, and your operating system doesn't
3385 support the setruid() system call (or equivalent), or at least Configure
3388 =item setsockopt() on closed socket %s
3390 (W closed) You tried to set a socket option on a closed socket. Did you
3391 forget to check the return value of your socket() call? See
3392 L<perlfunc/setsockopt>.
3394 =item Setuid/gid script is writable by world
3396 (F) The setuid emulator won't run a script that is writable by the
3397 world, because the world might have written on it already.
3399 =item shm%s not implemented
3401 (F) You don't have System V shared memory IPC on your system.
3403 =item <> should be quotes
3405 (F) You wrote C<< require <file> >> when you should have written
3408 =item /%s/ should probably be written as "%s"
3410 (W syntax) You have used a pattern where Perl expected to find a string,
3411 as in the first argument to C<join>. Perl will treat the true or false
3412 result of matching the pattern against $_ as the string, which is
3413 probably not what you had in mind.
3415 =item shutdown() on closed socket %s
3417 (W closed) You tried to do a shutdown on a closed socket. Seems a bit
3420 =item SIG%s handler "%s" not defined
3422 (W signal) The signal handler named in %SIG doesn't, in fact, exist.
3423 Perhaps you put it into the wrong package?
3425 =item sort is now a reserved word
3427 (F) An ancient error message that almost nobody ever runs into anymore.
3428 But before sort was a keyword, people sometimes used it as a filehandle.
3430 =item Sort subroutine didn't return a numeric value
3432 (F) A sort comparison routine must return a number. You probably blew
3433 it by not using C<< <=> >> or C<cmp>, or by not using them correctly.
3434 See L<perlfunc/sort>.
3436 =item Sort subroutine didn't return single value
3438 (F) A sort comparison subroutine may not return a list value with more
3439 or less than one element. See L<perlfunc/sort>.
3441 =item splice() offset past end of array
3443 (W misc) You attempted to specify an offset that was past the end of
3444 the array passed to splice(). Splicing will instead commence at the end
3445 of the array, rather than past it. If this isn't what you want, try
3446 explicitly pre-extending the array by assigning $#array = $offset. See
3451 (P) The split was looping infinitely. (Obviously, a split shouldn't
3452 iterate more times than there are characters of input, which is what
3453 happened.) See L<perlfunc/split>.
3455 =item Statement unlikely to be reached
3457 (W exec) You did an exec() with some statement after it other than a
3458 die(). This is almost always an error, because exec() never returns
3459 unless there was a failure. You probably wanted to use system()
3460 instead, which does return. To suppress this warning, put the exec() in
3463 =item stat() on unopened filehandle %s
3465 (W unopened) You tried to use the stat() function on a filehandle that
3466 was either never opened or has since been closed.
3468 =item Stub found while resolving method `%s' overloading %s
3470 (P) Overloading resolution over @ISA tree may be broken by importation
3471 stubs. Stubs should never be implicitly created, but explicit calls to
3472 C<can> may break this.
3474 =item Subroutine %s redefined
3476 (W redefine) You redefined a subroutine. To suppress this warning, say
3479 no warnings 'redefine';
3480 eval "sub name { ... }";
3483 =item Substitution loop
3485 (P) The substitution was looping infinitely. (Obviously, a substitution
3486 shouldn't iterate more times than there are characters of input, which
3487 is what happened.) See the discussion of substitution in
3488 L<perlop/"Quote and Quote-like Operators">.
3490 =item Substitution pattern not terminated
3492 (F) The lexer couldn't find the interior delimiter of an s/// or s{}{}
3493 construct. Remember that bracketing delimiters count nesting level.
3494 Missing the leading C<$> from variable C<$s> may cause this error.
3496 =item Substitution replacement not terminated
3498 (F) The lexer couldn't find the final delimiter of an s/// or s{}{}
3499 construct. Remember that bracketing delimiters count nesting level.
3500 Missing the leading C<$> from variable C<$s> may cause this error.
3502 =item substr outside of string
3504 (W substr),(F) You tried to reference a substr() that pointed outside of
3505 a string. That is, the absolute value of the offset was larger than the
3506 length of the string. See L<perlfunc/substr>. This warning is fatal if
3507 substr is used in an lvalue context (as the left hand side of an
3508 assignment or as a subroutine argument for example).
3510 =item suidperl is no longer needed since %s
3512 (F) Your Perl was compiled with B<-D>SETUID_SCRIPTS_ARE_SECURE_NOW, but
3513 a version of the setuid emulator somehow got run anyway.
3515 =item Switch (?(condition)... contains too many branches in regex; marked by <-- HERE in m/%s/
3517 (F) A (?(condition)if-clause|else-clause) construct can have at most two
3518 branches (the if-clause and the else-clause). If you want one or both to
3519 contain alternation, such as using C<this|that|other>, enclose it in
3520 clustering parentheses:
3522 (?(condition)(?:this|that|other)|else-clause)
3524 The <-- HERE shows in the regular expression about where the problem was
3525 discovered. See L<perlre>.
3527 =item Switch condition not recognized in regex; marked by <-- HERE in m/%s/
3529 (F) If the argument to the (?(...)if-clause|else-clause) construct is a
3530 number, it can be only a number. The <-- HERE shows in the regular expression
3531 about where the problem was discovered. See L<perlre>.
3533 =item switching effective %s is not implemented
3535 (F) While under the C<use filetest> pragma, we cannot switch the real
3536 and effective uids or gids.
3540 (F) Probably means you had a syntax error. Common reasons include:
3542 A keyword is misspelled.
3543 A semicolon is missing.
3545 An opening or closing parenthesis is missing.
3546 An opening or closing brace is missing.
3547 A closing quote is missing.
3549 Often there will be another error message associated with the syntax
3550 error giving more information. (Sometimes it helps to turn on B<-w>.)
3551 The error message itself often tells you where it was in the line when
3552 it decided to give up. Sometimes the actual error is several tokens
3553 before this, because Perl is good at understanding random input.
3554 Occasionally the line number may be misleading, and once in a blue moon
3555 the only way to figure out what's triggering the error is to call
3556 C<perl -c> repeatedly, chopping away half the program each time to see
3557 if the error went away. Sort of the cybernetic version of S<20
3560 =item syntax error at line %d: `%s' unexpected
3562 (A) You've accidentally run your script through the Bourne shell instead
3563 of Perl. Check the #! line, or manually feed your script into Perl
3566 =item syntax error in file %s at line %d, next 2 tokens "%s"
3568 (F) This error is likely to occur if you run a perl5 script through
3569 a perl4 interpreter, especially if the next 2 tokens are "use strict"
3570 or "my $var" or "our $var".
3574 (F) The final summary message when a C<perl -c> succeeds.
3576 =item sysread() on closed filehandle %s
3578 (W closed) You tried to read from a closed filehandle.
3580 =item sysread() on unopened filehandle %s
3582 (W unopened) You tried to read from a filehandle that was never opened.
3584 =item System V %s is not implemented on this machine
3586 (F) You tried to do something with a function beginning with "sem",
3587 "shm", or "msg" but that System V IPC is not implemented in your
3588 machine. In some machines the functionality can exist but be
3589 unconfigured. Consult your system support.
3591 =item syswrite() on closed filehandle %s
3593 (W closed) The filehandle you're writing to got itself closed sometime
3594 before now. Check your control flow.
3596 =item C<-T> and C<-B> not implemented on filehandles
3598 (F) Perl can't peek at the stdio buffer of filehandles when it doesn't
3599 know about your kind of stdio. You'll have to use a filename instead.
3601 =item Target of goto is too deeply nested
3603 (F) You tried to use C<goto> to reach a label that was too deeply nested
3604 for Perl to reach. Perl is doing you a favor by refusing.
3606 =item tell() on unopened filehandle
3608 (W unopened) You tried to use the tell() function on a filehandle that
3609 was either never opened or has since been closed.
3611 =item That use of $[ is unsupported
3613 (F) Assignment to C<$[> is now strictly circumscribed, and interpreted
3614 as a compiler directive. You may say only one of
3623 This is to prevent the problem of one module changing the array base out
3624 from under another module inadvertently. See L<perlvar/$[>.
3626 =item The crypt() function is unimplemented due to excessive paranoia
3628 (F) Configure couldn't find the crypt() function on your machine,
3629 probably because your vendor didn't supply it, probably because they
3630 think the U.S. Government thinks it's a secret, or at least that they
3631 will continue to pretend that it is. And if you quote me on that, I
3634 =item The %s function is unimplemented
3636 The function indicated isn't implemented on this architecture, according
3637 to the probings of Configure.
3639 =item The stat preceding %s wasn't an lstat
3641 (F) It makes no sense to test the current stat buffer for symbolic
3642 linkhood if the last stat that wrote to the stat buffer already went
3643 past the symlink to get to the real file. Use an actual filename
3646 =item This Perl can't reset CRTL environ elements (%s)
3648 =item This Perl can't set CRTL environ elements (%s=%s)
3650 (W internal) Warnings peculiar to VMS. You tried to change or delete an
3651 element of the CRTL's internal environ array, but your copy of Perl
3652 wasn't built with a CRTL that contained the setenv() function. You'll
3653 need to rebuild Perl with a CRTL that does, or redefine
3654 F<PERL_ENV_TABLES> (see L<perlvms>) so that the environ array isn't the
3655 target of the change to
3656 %ENV which produced the warning.
3658 =item thread failed to start: %s
3660 (F) The entry point function of threads->create() failed for some reason.
3662 =item Tied variable freed while still in use
3664 (F) An access method for a tied variable (e.g. FETCH) did something to
3665 free the variable. Since continuing the current operation is likely
3666 to result in a coredump, Perl is bailing out instead.
3668 =item times not implemented
3670 (F) Your version of the C library apparently doesn't do times(). I
3671 suspect you're not running on Unix.
3673 =item To%s: illegal mapping '%s'
3675 (F) You tried to define a customized To-mapping for lc(), lcfirst,
3676 uc(), or ucfirst() (or their string-inlined versions), but you
3677 specified an illegal mapping.
3678 See L<perlunicode/"User-Defined Character Properties">.
3680 =item Too deeply nested ()-groups
3682 (F) Your template contains ()-groups with a ridiculously deep nesting level.
3684 =item Too few args to syscall
3686 (F) There has to be at least one argument to syscall() to specify the
3687 system call to call, silly dilly.
3689 =item Too late for "-%s" option
3691 (X) The #! line (or local equivalent) in a Perl script contains the
3692 B<-M> or B<-m> option. This is an error because B<-M> and B<-m> options
3693 are not intended for use inside scripts. Use the C<use> pragma instead.
3695 =item Too late for "B<-T>" option
3697 (X) The #! line (or local equivalent) in a Perl script contains the
3698 B<-T> option, but Perl was not invoked with B<-T> in its command line.
3699 This is an error because, by the time Perl discovers a B<-T> in a
3700 script, it's too late to properly taint everything from the environment.
3703 If the Perl script is being executed as a command using the #!
3704 mechanism (or its local equivalent), this error can usually be fixed by
3705 editing the #! line so that the B<-T> option is a part of Perl's first
3706 argument: e.g. change C<perl -n -T> to C<perl -T -n>.
3708 If the Perl script is being executed as C<perl scriptname>, then the
3709 B<-T> option must appear on the command line: C<perl -T scriptname>.
3711 =item Too late to run %s block
3713 (W void) A CHECK or INIT block is being defined during run time proper,
3714 when the opportunity to run them has already passed. Perhaps you are
3715 loading a file with C<require> or C<do> when you should be using C<use>
3716 instead. Or perhaps you should put the C<require> or C<do> inside a
3719 =item Too many args to syscall
3721 (F) Perl supports a maximum of only 14 args to syscall().
3723 =item Too many arguments for %s
3725 (F) The function requires fewer arguments than you specified.
3729 (A) You've accidentally run your script through B<csh> instead of Perl.
3730 Check the #! line, or manually feed your script into Perl yourself.
3734 (A) You've accidentally run your script through B<csh> instead of Perl.
3735 Check the #! line, or manually feed your script into Perl yourself.
3737 =item Trailing \ in regex m/%s/
3739 (F) The regular expression ends with an unbackslashed backslash.
3740 Backslash it. See L<perlre>.
3742 =item Transliteration pattern not terminated
3744 (F) The lexer couldn't find the interior delimiter of a tr/// or tr[][]
3745 or y/// or y[][] construct. Missing the leading C<$> from variables
3746 C<$tr> or C<$y> may cause this error.
3748 =item Transliteration replacement not terminated
3750 (F) The lexer couldn't find the final delimiter of a tr/// or tr[][]
3753 =item '%s' trapped by operation mask
3755 (F) You tried to use an operator from a Safe compartment in which it's
3756 disallowed. See L<Safe>.
3758 =item truncate not implemented
3760 (F) Your machine doesn't implement a file truncation mechanism that
3761 Configure knows about.
3763 =item Type of arg %d to %s must be %s (not %s)
3765 (F) This function requires the argument in that position to be of a
3766 certain type. Arrays must be @NAME or C<@{EXPR}>. Hashes must be
3767 %NAME or C<%{EXPR}>. No implicit dereferencing is allowed--use the
3768 {EXPR} forms as an explicit dereference. See L<perlref>.
3770 =item umask not implemented
3772 (F) Your machine doesn't implement the umask function and you tried to
3773 use it to restrict permissions for yourself (EXPR & 0700).
3775 =item Unable to create sub named "%s"
3777 (F) You attempted to create or access a subroutine with an illegal name.
3779 =item Unbalanced context: %d more PUSHes than POPs
3781 (W internal) The exit code detected an internal inconsistency in how
3782 many execution contexts were entered and left.
3784 =item Unbalanced saves: %d more saves than restores
3786 (W internal) The exit code detected an internal inconsistency in how
3787 many values were temporarily localized.
3789 =item Unbalanced scopes: %d more ENTERs than LEAVEs
3791 (W internal) The exit code detected an internal inconsistency in how
3792 many blocks were entered and left.
3794 =item Unbalanced tmps: %d more allocs than frees
3796 (W internal) The exit code detected an internal inconsistency in how
3797 many mortal scalars were allocated and freed.
3799 =item Undefined format "%s" called
3801 (F) The format indicated doesn't seem to exist. Perhaps it's really in
3802 another package? See L<perlform>.
3804 =item Undefined sort subroutine "%s" called
3806 (F) The sort comparison routine specified doesn't seem to exist.
3807 Perhaps it's in a different package? See L<perlfunc/sort>.
3809 =item Undefined subroutine &%s called
3811 (F) The subroutine indicated hasn't been defined, or if it was, it has
3812 since been undefined.
3814 =item Undefined subroutine called
3816 (F) The anonymous subroutine you're trying to call hasn't been defined,
3817 or if it was, it has since been undefined.
3819 =item Undefined subroutine in sort
3821 (F) The sort comparison routine specified is declared but doesn't seem
3822 to have been defined yet. See L<perlfunc/sort>.
3824 =item Undefined top format "%s" called
3826 (F) The format indicated doesn't seem to exist. Perhaps it's really in
3827 another package? See L<perlform>.
3829 =item Undefined value assigned to typeglob
3831 (W misc) An undefined value was assigned to a typeglob, a la
3832 C<*foo = undef>. This does nothing. It's possible that you really mean
3835 =item %s: Undefined variable
3837 (A) You've accidentally run your script through B<csh> instead of Perl.
3838 Check the #! line, or manually feed your script into Perl yourself.
3840 =item unexec of %s into %s failed!
3842 (F) The unexec() routine failed for some reason. See your local FSF
3843 representative, who probably put it there in the first place.
3845 =item Unicode character %s is illegal
3847 (W utf8) Certain Unicode characters have been designated off-limits by
3848 the Unicode standard and should not be generated. If you really know
3849 what you are doing you can turn off this warning by C<no warnings 'utf8';>.
3851 =item Unknown BYTEORDER
3853 (F) There are no byte-swapping functions for a machine with this byte
3856 =item Unknown "re" subpragma '%s' (known ones are: %s)
3858 You tried to use an unknown subpragma of the "re" pragma.
3860 =item Unknown open() mode '%s'
3862 (F) The second argument of 3-argument open() is not among the list
3863 of valid modes: C<< < >>, C<< > >>, C<<< >> >>>, C<< +< >>,
3864 C<< +> >>, C<<< +>> >>>, C<-|>, C<|->, C<< <& >>, C<< >& >>.
3866 =item Unknown process %x sent message to prime_env_iter: %s
3868 (P) An error peculiar to VMS. Perl was reading values for %ENV before
3869 iterating over it, and someone else stuck a message in the stream of
3870 data Perl expected. Someone's very confused, or perhaps trying to
3871 subvert Perl's population of %ENV for nefarious purposes.
3873 =item Unknown switch condition (?(%.2s in regex; marked by <-- HERE in m/%s/
3875 (F) The condition part of a (?(condition)if-clause|else-clause) construct
3876 is not known. The condition may be lookahead or lookbehind (the condition
3877 is true if the lookahead or lookbehind is true), a (?{...}) construct (the
3878 condition is true if the code evaluates to a true value), or a number (the
3879 condition is true if the set of capturing parentheses named by the number
3882 The <-- HERE shows in the regular expression about where the problem was
3883 discovered. See L<perlre>.
3885 =item Unknown Unicode option letter '%c'
3887 You specified an unknown Unicode option. See L<perlrun> documentation
3888 of the C<-C> switch for the list of known options.
3890 =item Unknown Unicode option value %x
3892 You specified an unknown Unicode option. See L<perlrun> documentation
3893 of the C<-C> switch for the list of known options.
3895 =item Unknown warnings category '%s'
3897 (F) An error issued by the C<warnings> pragma. You specified a warnings
3898 category that is unknown to perl at this point.
3900 Note that if you want to enable a warnings category registered by a module
3901 (e.g. C<use warnings 'File::Find'>), you must have imported this module
3904 =item unmatched [ in regex; marked by <-- HERE in m/%s/
3906 (F) The brackets around a character class must match. If you wish to
3907 include a closing bracket in a character class, backslash it or put it
3908 first. The <-- HERE shows in the regular expression about where the problem
3909 was discovered. See L<perlre>.
3911 =item unmatched ( in regex; marked by <-- HERE in m/%s/
3913 (F) Unbackslashed parentheses must always be balanced in regular
3914 expressions. If you're a vi user, the % key is valuable for finding the
3915 matching parenthesis. The <-- HERE shows in the regular expression about
3916 where the problem was discovered. See L<perlre>.
3918 =item Unmatched right %s bracket
3920 (F) The lexer counted more closing curly or square brackets than opening
3921 ones, so you're probably missing a matching opening bracket. As a
3922 general rule, you'll find the missing one (so to speak) near the place
3923 you were last editing.
3925 =item Unquoted string "%s" may clash with future reserved word
3927 (W reserved) You used a bareword that might someday be claimed as a
3928 reserved word. It's best to put such a word in quotes, or capitalize it
3929 somehow, or insert an underbar into it. You might also declare it as a
3932 =item Unrecognized character %s
3934 (F) The Perl parser has no idea what to do with the specified character
3935 in your Perl script (or eval). Perhaps you tried to run a compressed
3936 script, a binary program, or a directory as a Perl program.
3938 =item /%s/: Unrecognized escape \\%c in character class passed through
3940 (W regexp) You used a backslash-character combination which is not
3941 recognized by Perl inside character classes. The character was
3942 understood literally.
3944 =item Unrecognized escape \\%c passed through in regex; marked by <-- HERE in m/%s/
3946 (W regexp) You used a backslash-character combination which is not
3947 recognized by Perl. This combination appears in an interpolated variable or
3948 a C<'>-delimited regular expression. The character was understood
3949 literally. The <-- HERE shows in the regular expression about where the
3950 escape was discovered.
3952 =item Unrecognized escape \\%c passed through
3954 (W misc) You used a backslash-character combination which is not
3957 =item Unrecognized signal name "%s"
3959 (F) You specified a signal name to the kill() function that was not
3960 recognized. Say C<kill -l> in your shell to see the valid signal names
3963 =item Unrecognized switch: -%s (-h will show valid options)
3965 (F) You specified an illegal option to Perl. Don't do that. (If you
3966 think you didn't do that, check the #! line to see if it's supplying the
3967 bad switch on your behalf.)
3969 =item Unsuccessful %s on filename containing newline
3971 (W newline) A file operation was attempted on a filename, and that
3972 operation failed, PROBABLY because the filename contained a newline,
3973 PROBABLY because you forgot to chomp() it off. See L<perlfunc/chomp>.
3975 =item Unsupported directory function "%s" called
3977 (F) Your machine doesn't support opendir() and readdir().
3979 =item Unsupported function %s
3981 (F) This machine doesn't implement the indicated function, apparently.
3982 At least, Configure doesn't think so.
3984 =item Unsupported function fork
3986 (F) Your version of executable does not support forking.
3988 Note that under some systems, like OS/2, there may be different flavors
3989 of Perl executables, some of which may support fork, some not. Try
3990 changing the name you call Perl by to C<perl_>, C<perl__>, and so on.
3992 =item Unsupported script encoding
3994 (F) Your program file begins with a Unicode Byte Order Mark (BOM) which
3995 declares it to be in a Unicode encoding that Perl cannot yet read.
3997 =item Unsupported socket function "%s" called
3999 (F) Your machine doesn't support the Berkeley socket mechanism, or at
4000 least that's what Configure thought.
4002 =item Unterminated attribute list
4004 (F) The lexer found something other than a simple identifier at the
4005 start of an attribute, and it wasn't a semicolon or the start of a
4006 block. Perhaps you terminated the parameter list of the previous
4007 attribute too soon. See L<attributes>.
4009 =item Unterminated attribute parameter in attribute list
4011 (F) The lexer saw an opening (left) parenthesis character while parsing
4012 an attribute list, but the matching closing (right) parenthesis
4013 character was not found. You may need to add (or remove) a backslash
4014 character to get your parentheses to balance. See L<attributes>.
4016 =item Unterminated compressed integer
4018 (F) An argument to unpack("w",...) was incompatible with the BER
4019 compressed integer format and could not be converted to an integer.
4020 See L<perlfunc/pack>.
4022 =item Unterminated <> operator
4024 (F) The lexer saw a left angle bracket in a place where it was expecting
4025 a term, so it's looking for the corresponding right angle bracket, and
4026 not finding it. Chances are you left some needed parentheses out
4027 earlier in the line, and you really meant a "less than".
4029 =item untie attempted while %d inner references still exist
4031 (W untie) A copy of the object returned from C<tie> (or C<tied>) was
4032 still valid when C<untie> was called.
4034 =item Useless (?-%s) - don't use /%s modifier in regex; marked by <-- HERE in m/%s/
4036 (W regexp) You have used an internal modifier such as (?-o) that has no
4037 meaning unless removed from the entire regexp:
4039 if ($string =~ /(?-o)$pattern/o) { ... }
4043 if ($string =~ /$pattern/) { ... }
4045 The <-- HERE shows in the regular expression about
4046 where the problem was discovered. See L<perlre>.
4048 =item Useless (?%s) - use /%s modifier in regex; marked by <-- HERE in m/%s/
4050 (W regexp) You have used an internal modifier such as (?o) that has no
4051 meaning unless applied to the entire regexp:
4053 if ($string =~ /(?o)$pattern/) { ... }
4057 if ($string =~ /$pattern/o) { ... }
4059 The <-- HERE shows in the regular expression about
4060 where the problem was discovered. See L<perlre>.
4062 =item Useless use of %s in void context
4064 (W void) You did something without a side effect in a context that does
4065 nothing with the return value, such as a statement that doesn't return a
4066 value from a block, or the left side of a scalar comma operator. Very
4067 often this points not to stupidity on your part, but a failure of Perl
4068 to parse your program the way you thought it would. For example, you'd
4069 get this if you mixed up your C precedence with Python precedence and
4074 when you meant to say
4076 ($one, $two) = (1, 2);
4078 Another common error is to use ordinary parentheses to construct a list
4079 reference when you should be using square or curly brackets, for
4084 when you should have said
4088 The square brackets explicitly turn a list value into a scalar value,
4089 while parentheses do not. So when a parenthesized list is evaluated in
4090 a scalar context, the comma is treated like C's comma operator, which
4091 throws away the left argument, which is not what you want. See
4092 L<perlref> for more on this.
4094 This warning will not be issued for numerical constants equal to 0 or 1
4095 since they are often used in statements like
4097 1 while sub_with_side_effects() ;
4099 String constants that would normally evaluate to 0 or 1 are warned
4102 =item Useless use of "re" pragma
4104 (W) You did C<use re;> without any arguments. That isn't very useful.
4106 =item Useless use of sort in scalar context
4108 (W void) You used sort in scalar context, as in :
4112 This is not very useful, and perl currently optimizes this away.
4114 =item Useless use of %s with no values
4116 (W syntax) You used the push() or unshift() function with no arguments
4117 apart from the array, like C<push(@x)> or C<unshift(@foo)>. That won't
4118 usually have any effect on the array, so is completely useless. It's
4119 possible in principle that push(@tied_array) could have some effect
4120 if the array is tied to a class which implements a PUSH method. If so,
4121 you can write it as C<push(@tied_array,())> to avoid this warning.
4123 =item "use" not allowed in expression
4125 (F) The "use" keyword is recognized and executed at compile time, and
4126 returns no useful value. See L<perlmod>.
4128 =item Use of bare << to mean <<"" is deprecated
4130 (D deprecated) You are now encouraged to use the explicitly quoted form
4131 if you wish to use an empty line as the terminator of the here-document.
4133 =item Use of chdir('') or chdir(undef) as chdir() deprecated
4135 (D deprecated) chdir() with no arguments is documented to change to
4136 $ENV{HOME} or $ENV{LOGDIR}. chdir(undef) and chdir('') share this
4137 behavior, but that has been deprecated. In future versions they
4140 Be careful to check that what you pass to chdir() is defined and not
4141 blank, else you might find yourself in your home directory.
4143 =item Use of /c modifier is meaningless in s///
4145 (W regexp) You used the /c modifier in a substitution. The /c
4146 modifier is not presently meaningful in substitutions.
4148 =item Use of /c modifier is meaningless without /g
4150 (W regexp) You used the /c modifier with a regex operand, but didn't
4151 use the /g modifier. Currently, /c is meaningful only when /g is
4152 used. (This may change in the future.)
4154 =item Use of *glob{FILEHANDLE} is deprecated
4156 (D deprecated) You are now encouraged to use the shorter *glob{IO} form
4157 to access the filehandle slot within a typeglob.
4159 =item Use of /g modifier is meaningless in split
4161 (W regexp) You used the /g modifier on the pattern for a C<split>
4162 operator. Since C<split> always tries to match the pattern
4163 repeatedly, the C</g> has no effect.
4165 =item Use of implicit split to @_ is deprecated
4167 (D deprecated) It makes a lot of work for the compiler when you clobber
4168 a subroutine's argument list, so it's better if you assign the results
4169 of a split() explicitly to an array (or list).
4171 =item Use of inherited AUTOLOAD for non-method %s() is deprecated
4173 (D deprecated) As an (ahem) accidental feature, C<AUTOLOAD> subroutines
4174 are looked up as methods (using the C<@ISA> hierarchy) even when the
4175 subroutines to be autoloaded were called as plain functions (e.g.
4176 C<Foo::bar()>), not as methods (e.g. C<< Foo->bar() >> or C<<
4179 This bug will be rectified in future by using method lookup only for
4180 methods' C<AUTOLOAD>s. However, there is a significant base of existing
4181 code that may be using the old behavior. So, as an interim step, Perl
4182 currently issues an optional warning when non-methods use inherited
4185 The simple rule is: Inheritance will not work when autoloading
4186 non-methods. The simple fix for old code is: In any module that used
4187 to depend on inheriting C<AUTOLOAD> for non-methods from a base class
4188 named C<BaseClass>, execute C<*AUTOLOAD = \&BaseClass::AUTOLOAD> during
4191 In code that currently says C<use AutoLoader; @ISA = qw(AutoLoader);>
4192 you should remove AutoLoader from @ISA and change C<use AutoLoader;> to
4193 C<use AutoLoader 'AUTOLOAD';>.
4195 =item Use of %s in printf format not supported
4197 (F) You attempted to use a feature of printf that is accessible from
4198 only C. This usually means there's a better way to do it in Perl.
4200 =item Use of $* is deprecated
4202 (D deprecated) This variable magically turned on multi-line pattern
4203 matching, both for you and for any luckless subroutine that you happen
4204 to call. You should use the new C<//m> and C<//s> modifiers now to do
4205 that without the dangerous action-at-a-distance effects of C<$*>.
4207 =item Use of $# is deprecated
4209 (D deprecated) This was an ill-advised attempt to emulate a poorly
4210 defined B<awk> feature. Use an explicit printf() or sprintf() instead.
4212 =item Use of %s is deprecated
4214 (D deprecated) The construct indicated is no longer recommended for use,
4215 generally because there's a better way to do it, and also because the
4216 old way has bad side effects.
4218 =item Use of freed value in iteration (perhaps you modified the iterated array within the loop?)
4220 (F) This is typically caused by code like the following:
4223 @a = () for (1,2,@a);
4225 You are not supposed to modify arrays while they are being iterated over.
4226 For speed and efficiency reasons, Perl internally does not do full
4227 reference-counting of iterated items, hence deleting such an item in the
4228 middle of an iteration causes Perl to see a freed value.
4230 =item Use of -l on filehandle %s
4232 (W io) A filehandle represents an opened file, and when you opened the file
4233 it already went past any symlink you are presumably trying to look for.
4234 The operation returned C<undef>. Use a filename instead.
4236 =item Use of "package" with no arguments is deprecated
4238 (D deprecated) You used the C<package> keyword without specifying a package
4239 name. So no namespace is current at all. Using this can cause many
4240 otherwise reasonable constructs to fail in baffling ways. C<use strict;>
4243 =item Use of reference "%s" as array index
4245 (W misc) You tried to use a reference as an array index; this probably
4246 isn't what you mean, because references in numerical context tend
4247 to be huge numbers, and so usually indicates programmer error.
4249 If you really do mean it, explicitly numify your reference, like so:
4250 C<$array[0+$ref]>. This warning is not given for overloaded objects,
4251 either, because you can overload the numification and stringification
4252 operators and then you assumedly know what you are doing.
4254 =item Use of reserved word "%s" is deprecated
4256 (D deprecated) The indicated bareword is a reserved word. Future
4257 versions of perl may use it as a keyword, so you're better off either
4258 explicitly quoting the word in a manner appropriate for its context of
4259 use, or using a different name altogether. The warning can be
4260 suppressed for subroutine names by either adding a C<&> prefix, or using
4261 a package qualifier, e.g. C<&our()>, or C<Foo::our()>.
4263 =item Use of tainted arguments in %s is deprecated
4265 (W taint, deprecated) You have supplied C<system()> or C<exec()> with multiple
4266 arguments and at least one of them is tainted. This used to be allowed
4267 but will become a fatal error in a future version of perl. Untaint your
4268 arguments. See L<perlsec>.
4270 =item Use of uninitialized value%s
4272 (W uninitialized) An undefined value was used as if it were already
4273 defined. It was interpreted as a "" or a 0, but maybe it was a mistake.
4274 To suppress this warning assign a defined value to your variables.
4276 To help you figure out what was undefined, perl tells you what operation
4277 you used the undefined value in. Note, however, that perl optimizes your
4278 program and the operation displayed in the warning may not necessarily
4279 appear literally in your program. For example, C<"that $foo"> is
4280 usually optimized into C<"that " . $foo>, and the warning will refer to
4281 the C<concatenation (.)> operator, even though there is no C<.> in your
4284 =item Using a hash as a reference is deprecated
4286 (D deprecated) You tried to use a hash as a reference, as in
4287 C<< %foo->{"bar"} >> or C<< %$ref->{"hello"} >>. Versions of perl <= 5.6.1
4288 used to allow this syntax, but shouldn't have. It is now deprecated, and will
4289 be removed in a future version.
4291 =item Using an array as a reference is deprecated
4293 (D deprecated) You tried to use an array as a reference, as in
4294 C<< @foo->[23] >> or C<< @$ref->[99] >>. Versions of perl <= 5.6.1 used to
4295 allow this syntax, but shouldn't have. It is now deprecated, and will be
4296 removed in a future version.
4298 =item UTF-16 surrogate %s
4300 (W utf8) You tried to generate half of an UTF-16 surrogate by
4301 requesting a Unicode character between the code points 0xD800 and
4302 0xDFFF (inclusive). That range is reserved exclusively for the use of
4303 UTF-16 encoding (by having two 16-bit UCS-2 characters); but Perl
4304 encodes its characters in UTF-8, so what you got is a very illegal
4305 character. If you really know what you are doing you can turn off
4306 this warning by C<no warnings 'utf8';>.
4308 =item Value of %s can be "0"; test with defined()
4310 (W misc) In a conditional expression, you used <HANDLE>, <*> (glob),
4311 C<each()>, or C<readdir()> as a boolean value. Each of these constructs
4312 can return a value of "0"; that would make the conditional expression
4313 false, which is probably not what you intended. When using these
4314 constructs in conditional expressions, test their values with the
4315 C<defined> operator.
4317 =item Value of CLI symbol "%s" too long
4319 (W misc) A warning peculiar to VMS. Perl tried to read the value of an
4320 %ENV element from a CLI symbol table, and found a resultant string
4321 longer than 1024 characters. The return value has been truncated to
4324 =item Variable "%s" is not imported%s
4326 (F) While "use strict" in effect, you referred to a global variable that
4327 you apparently thought was imported from another module, because
4328 something else of the same name (usually a subroutine) is exported by
4329 that module. It usually means you put the wrong funny character on the
4330 front of your variable.
4332 =item Variable length lookbehind not implemented in regex; marked by <-- HERE in m/%s/
4334 (F) Lookbehind is allowed only for subexpressions whose length is fixed and
4335 known at compile time. The <-- HERE shows in the regular expression about
4336 where the problem was discovered. See L<perlre>.
4338 =item "%s" variable %s masks earlier declaration in same %s
4340 (W misc) A "my" or "our" variable has been redeclared in the current
4341 scope or statement, effectively eliminating all access to the previous
4342 instance. This is almost always a typographical error. Note that the
4343 earlier variable will still exist until the end of the scope or until
4344 all closure referents to it are destroyed.
4346 =item Variable "%s" may be unavailable
4348 (W closure) An inner (nested) I<anonymous> subroutine is inside a
4349 I<named> subroutine, and outside that is another subroutine; and the
4350 anonymous (innermost) subroutine is referencing a lexical variable
4351 defined in the outermost subroutine. For example:
4353 sub outermost { my $a; sub middle { sub { $a } } }
4355 If the anonymous subroutine is called or referenced (directly or
4356 indirectly) from the outermost subroutine, it will share the variable as
4357 you would expect. But if the anonymous subroutine is called or
4358 referenced when the outermost subroutine is not active, it will see the
4359 value of the shared variable as it was before and during the *first*
4360 call to the outermost subroutine, which is probably not what you want.
4362 In these circumstances, it is usually best to make the middle subroutine
4363 anonymous, using the C<sub {}> syntax. Perl has specific support for
4364 shared variables in nested anonymous subroutines; a named subroutine in
4365 between interferes with this feature.
4367 =item Variable syntax
4369 (A) You've accidentally run your script through B<csh> instead
4370 of Perl. Check the #! line, or manually feed your script into
4373 =item Variable "%s" will not stay shared
4375 (W closure) An inner (nested) I<named> subroutine is referencing a
4376 lexical variable defined in an outer subroutine.
4378 When the inner subroutine is called, it will probably see the value of
4379 the outer subroutine's variable as it was before and during the *first*
4380 call to the outer subroutine; in this case, after the first call to the
4381 outer subroutine is complete, the inner and outer subroutines will no
4382 longer share a common value for the variable. In other words, the
4383 variable will no longer be shared.
4385 Furthermore, if the outer subroutine is anonymous and references a
4386 lexical variable outside itself, then the outer and inner subroutines
4387 will I<never> share the given variable.
4389 This problem can usually be solved by making the inner subroutine
4390 anonymous, using the C<sub {}> syntax. When inner anonymous subs that
4391 reference variables in outer subroutines are called or referenced, they
4392 are automatically rebound to the current values of such variables.
4394 =item Version number must be a constant number
4396 (P) The attempt to translate a C<use Module n.n LIST> statement into
4397 its equivalent C<BEGIN> block found an internal inconsistency with
4400 =item v-string in use/require is non-portable
4402 (W portable) The use of v-strings is non-portable to older, pre-5.6, Perls.
4403 If you want your scripts to be backward portable, use the floating
4404 point version number: for example, instead of C<use 5.6.1> say
4405 C<use 5.006_001>. This of course won't help: the older Perls
4406 won't suddenly start understanding newer features, but at least
4407 they will show a sensible error message indicating the required
4410 =item Warning: something's wrong
4412 (W) You passed warn() an empty string (the equivalent of C<warn "">) or
4413 you called it with no args and C<$_> was empty.
4415 =item Warning: unable to close filehandle %s properly
4417 (S) The implicit close() done by an open() got an error indication on
4418 the close(). This usually indicates your file system ran out of disk
4421 =item Warning: Use of "%s" without parentheses is ambiguous
4423 (S ambiguous) You wrote a unary operator followed by something that
4424 looks like a binary operator that could also have been interpreted as a
4425 term or unary operator. For instance, if you know that the rand
4426 function has a default argument of 1.0, and you write
4430 you may THINK you wrote the same thing as
4434 but in actual fact, you got
4438 So put in parentheses to say what you really mean.
4440 =item Wide character in %s
4442 (W utf8) Perl met a wide character (>255) when it wasn't expecting
4443 one. This warning is by default on for I/O (like print) but can be
4444 turned off by C<no warnings 'utf8';>. You are supposed to explicitly
4445 mark the filehandle with an encoding, see L<open> and L<perlfunc/binmode>.
4447 =item Within []-length '%c' not allowed
4449 (F) The count in the (un)pack template may be replaced by C<[TEMPLATE]> only if
4450 C<TEMPLATE> always matches the same amount of packed bytes that can be
4451 determined from the template alone. This is not possible if it contains an
4452 of the codes @, /, U, u, w or a *-length. Redesign the template.
4454 =item write() on closed filehandle %s
4456 (W closed) The filehandle you're writing to got itself closed sometime
4457 before now. Check your control flow.
4459 =item 'X' outside of string
4461 (F) You had a (un)pack template that specified a relative position before
4462 the beginning of the string being (un)packed. See L<perlfunc/pack>.
4464 =item 'x' outside of string in unpack
4466 (F) You had a pack template that specified a relative position after
4467 the end of the string being unpacked. See L<perlfunc/pack>.
4469 =item Xsub "%s" called in sort
4471 (F) The use of an external subroutine as a sort comparison is not yet
4474 =item Xsub called in sort
4476 (F) The use of an external subroutine as a sort comparison is not yet
4479 =item YOU HAVEN'T DISABLED SET-ID SCRIPTS IN THE KERNEL YET!
4481 (F) And you probably never will, because you probably don't have the
4482 sources to your kernel, and your vendor probably doesn't give a rip
4483 about what you want. Your best bet is to put a setuid C wrapper around
4486 =item You need to quote "%s"
4488 (W syntax) You assigned a bareword as a signal handler name.
4489 Unfortunately, you already have a subroutine of that name declared,
4490 which means that Perl 5 will try to call the subroutine when the
4491 assignment is executed, which is probably not what you want. (If it IS
4492 what you want, put an & in front.)