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 (mandatory).
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 Optional warnings are enabled by using the B<-w> switch. Warnings may
19 be captured by setting C<$SIG{__WARN__}> to a reference to a routine that
20 will be called on each warning instead of printing it. See L<perlvar>.
21 Trappable errors may be trapped using the eval operator. See
24 Some of these messages are generic. Spots that vary are denoted with a %s,
25 just as in a printf format. Note that some messages start with a %s!
26 The symbols C<"%(-?@> sort before the letters, while C<[> and C<\> sort after.
30 =item "my" variable %s can't be in a package
32 (F) Lexically scoped variables aren't in a package, so it doesn't make sense
33 to try to declare one with a package qualifier on the front. Use local()
34 if you want to localize a package variable.
36 =item "my" variable %s masks earlier declaration in same %s
38 (W) A lexical variable has been redeclared in the current scope or statement,
39 effectively eliminating all access to the previous instance. This is almost
40 always a typographical error. Note that the earlier variable will still exist
41 until the end of the scope or until all closure referents to it are
44 =item "no" not allowed in expression
46 (F) The "no" keyword is recognized and executed at compile time, and returns
47 no useful value. See L<perlmod>.
49 =item "use" not allowed in expression
51 (F) The "use" keyword is recognized and executed at compile time, and returns
52 no useful value. See L<perlmod>.
54 =item '!' allowed only after types %s
56 (F) The '!' is allowed in pack() and unpack() only after certain types.
59 =item # cannot take a count
61 (F) You had an unpack template indicating a counted-length string,
62 but you have also specified an explicit size for the string.
65 =item # must be followed by a, A or Z
67 (F) You had an unpack template indicating a counted-length string,
68 which must be followed by one of the letters a, A or Z
69 to indicate what sort of string is to be unpacked.
72 =item # must be followed by a*, A* or Z*
74 (F) You had an pack template indicating a counted-length string,
75 Currently the only things that can have their length counted are a*, A* or Z*.
78 =item # must follow a numeric type
80 (F) You had an unpack template that contained a '#',
81 but this did not follow some numeric unpack specification.
84 =item % may only be used in unpack
86 (F) You can't pack a string by supplying a checksum, because the
87 checksumming process loses information, and you can't go the other
88 way. See L<perlfunc/unpack>.
90 =item /%s/: Unrecognized escape \\%c passed through
92 (W) You used a backslash-character combination which is not recognized
93 by Perl. This combination appears in an interpolated variable or a
94 C<'>-delimited regular expression.
96 =item %s (...) interpreted as function
98 (W) You've run afoul of the rule that says that any list operator followed
99 by parentheses turns into a function, with all the list operators arguments
100 found inside the parentheses. See L<perlop/Terms and List Operators (Leftward)>.
102 =item %s() called too early to check prototype
104 (W) You've called a function that has a prototype before the parser saw a
105 definition or declaration for it, and Perl could not check that the call
106 conforms to the prototype. You need to either add an early prototype
107 declaration for the subroutine in question, or move the subroutine
108 definition ahead of the call to get proper prototype checking. Alternatively,
109 if you are certain that you're calling the function correctly, you may put
110 an ampersand before the name to avoid the warning. See L<perlsub>.
112 =item %s argument is not a HASH element
114 (F) The argument to exists() must be a hash element, such as
117 $ref->[12]->{"susie"}
119 =item %s argument is not a HASH element or slice
121 (F) The argument to delete() must be either a hash element, such as
124 $ref->[12]->{"susie"}
126 or a hash slice, such as
128 @foo{$bar, $baz, $xyzzy}
129 @{$ref->[12]}{"susie", "queue"}
131 =item %s did not return a true value
133 (F) A required (or used) file must return a true value to indicate that
134 it compiled correctly and ran its initialization code correctly. It's
135 traditional to end such a file with a "1;", though any true value would
136 do. See L<perlfunc/require>.
138 =item %s found where operator expected
140 (S) The Perl lexer knows whether to expect a term or an operator. If it
141 sees what it knows to be a term when it was expecting to see an operator,
142 it gives you this warning. Usually it indicates that an operator or
143 delimiter was omitted, such as a semicolon.
145 =item %s had compilation errors
147 (F) The final summary message when a C<perl -c> fails.
149 =item %s has too many errors
151 (F) The parser has given up trying to parse the program after 10 errors.
152 Further error messages would likely be uninformative.
154 =item %s matches null string many times
156 (W) The pattern you've specified would be an infinite loop if the
157 regular expression engine didn't specifically check for that. See L<perlre>.
159 =item %s never introduced
161 (S) The symbol in question was declared but somehow went out of scope
162 before it could possibly have been used.
166 (F) The final summary message when a C<perl -c> succeeds.
168 =item %s: Command not found
170 (A) You've accidentally run your script through B<csh> instead
171 of Perl. Check the #! line, or manually feed your script into
174 =item %s: Expression syntax
176 (A) You've accidentally run your script through B<csh> instead
177 of Perl. Check the #! line, or manually feed your script into
180 =item %s: Undefined variable
182 (A) You've accidentally run your script through B<csh> instead
183 of Perl. Check the #! line, or manually feed your script into
188 (A) You've accidentally run your script through the Bourne shell
189 instead of Perl. Check the #! line, or manually feed your script
192 =item (in cleanup) %s
194 (W) This prefix usually indicates that a DESTROY() method raised
195 the indicated exception. Since destructors are usually called by
196 the system at arbitrary points during execution, and often a vast
197 number of times, the warning is issued only once for any number
198 of failures that would otherwise result in the same message being
201 Failure of user callbacks dispatched using the C<G_KEEPERR> flag
202 could also result in this warning. See L<perlcall/G_KEEPERR>.
204 =item (Missing semicolon on previous line?)
206 (S) This is an educated guess made in conjunction with the message "%s
207 found where operator expected". Don't automatically put a semicolon on
208 the previous line just because you saw this message.
210 =item B<-P> not allowed for setuid/setgid script
212 (F) The script would have to be opened by the C preprocessor by name,
213 which provides a race condition that breaks security.
215 =item C<-T> and C<-B> not implemented on filehandles
217 (F) Perl can't peek at the stdio buffer of filehandles when it doesn't
218 know about your kind of stdio. You'll have to use a filename instead.
220 =item C<-p> destination: %s
222 (F) An error occurred during the implicit output invoked by the C<-p>
223 command-line switch. (This output goes to STDOUT unless you've
224 redirected it with select().)
226 =item 500 Server error
230 =item ?+* follows nothing in regexp
232 (F) You started a regular expression with a quantifier. Backslash it
233 if you meant it literally. See L<perlre>.
235 =item @ outside of string
237 (F) You had a pack template that specified an absolute position outside
238 the string being unpacked. See L<perlfunc/pack>.
240 =item <> should be quotes
242 (F) You wrote C<require E<lt>fileE<gt>> when you should have written
245 =item accept() on closed fd
247 (W) You tried to do an accept on a closed socket. Did you forget to check
248 the return value of your socket() call? See L<perlfunc/accept>.
250 =item Allocation too large: %lx
252 (X) You can't allocate more than 64K on an MS-DOS machine.
254 =item Applying %s to %s will act on scalar(%s)
256 (W) The pattern match (//), substitution (s///), and transliteration (tr///)
257 operators work on scalar values. If you apply one of them to an array
258 or a hash, it will convert the array or hash to a scalar value -- the
259 length of an array, or the population info of a hash -- and then work on
260 that scalar value. This is probably not what you meant to do. See
261 L<perlfunc/grep> and L<perlfunc/map> for alternatives.
263 =item Arg too short for msgsnd
265 (F) msgsnd() requires a string at least as long as sizeof(long).
267 =item Ambiguous use of %s resolved as %s
269 (W)(S) You said something that may not be interpreted the way
270 you thought. Normally it's pretty easy to disambiguate it by supplying
271 a missing quote, operator, parenthesis pair or declaration.
273 =item Ambiguous call resolved as CORE::%s(), qualify as such or use &
275 (W) A subroutine you have declared has the same name as a Perl keyword,
276 and you have used the name without qualification for calling one or the
277 other. Perl decided to call the builtin because the subroutine is
280 To force interpretation as a subroutine call, either put an ampersand
281 before the subroutine name, or qualify the name with its package.
282 Alternatively, you can import the subroutine (or pretend that it's
283 imported with the C<use subs> pragma).
285 To silently interpret it as the Perl operator, use the C<CORE::> prefix
286 on the operator (e.g. C<CORE::log($x)>) or by declaring the subroutine
287 to be an object method (see L<attrs>).
289 =item Args must match #! line
291 (F) The setuid emulator requires that the arguments Perl was invoked
292 with match the arguments specified on the #! line. Since some systems
293 impose a one-argument limit on the #! line, try combining switches;
294 for example, turn C<-w -U> into C<-wU>.
296 =item Argument "%s" isn't numeric%s
298 (W) The indicated string was fed as an argument to an operator that
299 expected a numeric value instead. If you're fortunate the message
300 will identify which operator was so unfortunate.
302 =item Array @%s missing the @ in argument %d of %s()
304 (D) Really old Perl let you omit the @ on array names in some spots. This
305 is now heavily deprecated.
307 =item assertion botched: %s
309 (P) The malloc package that comes with Perl had an internal failure.
311 =item Assertion failed: file "%s"
313 (P) A general assertion failed. The file in question must be examined.
315 =item Assignment to both a list and a scalar
317 (F) If you assign to a conditional operator, the 2nd and 3rd arguments
318 must either both be scalars or both be lists. Otherwise Perl won't
319 know which context to supply to the right side.
321 =item Attempt to free non-arena SV: 0x%lx
323 (P) All SV objects are supposed to be allocated from arenas that will
324 be garbage collected on exit. An SV was discovered to be outside any
327 =item Attempt to free nonexistent shared string
329 (P) Perl maintains a reference counted internal table of strings to
330 optimize the storage and access of hash keys and other strings. This
331 indicates someone tried to decrement the reference count of a string
332 that can no longer be found in the table.
334 =item Attempt to free temp prematurely
336 (W) Mortalized values are supposed to be freed by the free_tmps()
337 routine. This indicates that something else is freeing the SV before
338 the free_tmps() routine gets a chance, which means that the free_tmps()
339 routine will be freeing an unreferenced scalar when it does try to free
342 =item Attempt to free unreferenced glob pointers
344 (P) The reference counts got screwed up on symbol aliases.
346 =item Attempt to free unreferenced scalar
348 (W) Perl went to decrement the reference count of a scalar to see if it
349 would go to 0, and discovered that it had already gone to 0 earlier,
350 and should have been freed, and in fact, probably was freed. This
351 could indicate that SvREFCNT_dec() was called too many times, or that
352 SvREFCNT_inc() was called too few times, or that the SV was mortalized
353 when it shouldn't have been, or that memory has been corrupted.
355 =item Attempt to join self
357 (F) You tried to join a thread from within itself, which is an
358 impossible task. You may be joining the wrong thread, or you may
359 need to move the join() to some other thread.
361 =item Attempt to pack pointer to temporary value
363 (W) You tried to pass a temporary value (like the result of a
364 function, or a computed expression) to the "p" pack() template. This
365 means the result contains a pointer to a location that could become
366 invalid anytime, even before the end of the current statement. Use
367 literals or global values as arguments to the "p" pack() template to
370 =item Attempt to use reference as lvalue in substr
372 (W) You supplied a reference as the first argument to substr() used
373 as an lvalue, which is pretty strange. Perhaps you forgot to
374 dereference it first. See L<perlfunc/substr>.
376 =item Bad arg length for %s, is %d, should be %d
378 (F) You passed a buffer of the wrong size to one of msgctl(), semctl() or
379 shmctl(). In C parlance, the correct sizes are, respectively,
380 S<sizeof(struct msqid_ds *)>, S<sizeof(struct semid_ds *)>, and
381 S<sizeof(struct shmid_ds *)>.
383 =item Bad filehandle: %s
385 (F) A symbol was passed to something wanting a filehandle, but the symbol
386 has no filehandle associated with it. Perhaps you didn't do an open(), or
387 did it in another package.
389 =item Bad free() ignored
391 (S) An internal routine called free() on something that had never been
392 malloc()ed in the first place. Mandatory, but can be disabled by
393 setting environment variable C<PERL_BADFREE> to 1.
395 This message can be quite often seen with DB_File on systems with
396 "hard" dynamic linking, like C<AIX> and C<OS/2>. It is a bug of
397 C<Berkeley DB> which is left unnoticed if C<DB> uses I<forgiving>
402 (P) One of the internal hash routines was passed a null HV pointer.
404 =item Bad index while coercing array into hash
406 (F) The index looked up in the hash found as the 0'th element of a
407 pseudo-hash is not legal. Index values must be at 1 or greater.
410 =item Bad name after %s::
412 (F) You started to name a symbol by using a package prefix, and then didn't
413 finish the symbol. In particular, you can't interpolate outside of quotes,
422 $sym = "mypack::$var";
424 =item Bad symbol for array
426 (P) An internal request asked to add an array entry to something that
427 wasn't a symbol table entry.
429 =item Bad symbol for filehandle
431 (P) An internal request asked to add a filehandle entry to something that
432 wasn't a symbol table entry.
434 =item Bad symbol for hash
436 (P) An internal request asked to add a hash entry to something that
437 wasn't a symbol table entry.
439 =item Badly placed ()'s
441 (A) You've accidentally run your script through B<csh> instead
442 of Perl. Check the #! line, or manually feed your script into
445 =item Bareword "%s" not allowed while "strict subs" in use
447 (F) With "strict subs" in use, a bareword is only allowed as a
448 subroutine identifier, in curly brackets or to the left of the "=>" symbol.
449 Perhaps you need to predeclare a subroutine?
451 =item Bareword "%s" refers to nonexistent package
453 (W) You used a qualified bareword of the form C<Foo::>, but
454 the compiler saw no other uses of that namespace before that point.
455 Perhaps you need to predeclare a package?
457 =item BEGIN failed--compilation aborted
459 (F) An untrapped exception was raised while executing a BEGIN subroutine.
460 Compilation stops immediately and the interpreter is exited.
462 =item BEGIN not safe after errors--compilation aborted
464 (F) Perl found a C<BEGIN {}> subroutine (or a C<use> directive, which
465 implies a C<BEGIN {}>) after one or more compilation errors had
466 already occurred. Since the intended environment for the C<BEGIN {}>
467 could not be guaranteed (due to the errors), and since subsequent code
468 likely depends on its correct operation, Perl just gave up.
470 =item bind() on closed fd
472 (W) You tried to do a bind on a closed socket. Did you forget to check
473 the return value of your socket() call? See L<perlfunc/bind>.
475 =item Bizarre copy of %s in %s
477 (P) Perl detected an attempt to copy an internal value that is not copiable.
479 =item Buffer overflow in prime_env_iter: %s
481 (W) A warning peculiar to VMS. While Perl was preparing to iterate over
482 %ENV, it encountered a logical name or symbol definition which was too long,
483 so it was truncated to the string shown.
485 =item Callback called exit
487 (F) A subroutine invoked from an external package via perl_call_sv()
488 exited by calling exit.
490 =item Can't "goto" outside a block
492 (F) A "goto" statement was executed to jump out of what might look
493 like a block, except that it isn't a proper block. This usually
494 occurs if you tried to jump out of a sort() block or subroutine, which
495 is a no-no. See L<perlfunc/goto>.
497 =item Can't "goto" into the middle of a foreach loop
499 (F) A "goto" statement was executed to jump into the middle of a
500 foreach loop. You can't get there from here. See L<perlfunc/goto>.
502 =item Can't "last" outside a block
504 (F) A "last" statement was executed to break out of the current block,
505 except that there's this itty bitty problem called there isn't a
506 current block. Note that an "if" or "else" block doesn't count as a
507 "loopish" block, as doesn't a block given to sort(). You can usually double
508 the curlies to get the same effect though, because the inner curlies
509 will be considered a block that loops once. See L<perlfunc/last>.
511 =item Can't "next" outside a block
513 (F) A "next" statement was executed to reiterate the current block, but
514 there isn't a current block. Note that an "if" or "else" block doesn't
515 count as a "loopish" block, as doesn't a block given to sort(). You can
516 usually double the curlies to get the same effect though, because the inner
517 curlies will be considered a block that loops once. See L<perlfunc/next>.
519 =item Can't read CRTL environ
521 (S) A warning peculiar to VMS. Perl tried to read an element of %ENV
522 from the CRTL's internal environment array and discovered the array was
523 missing. You need to figure out where your CRTL misplaced its environ
524 or define F<PERL_ENV_TABLES> (see L<perlvms>) so that environ is not searched.
526 =item Can't "redo" outside a block
528 (F) A "redo" statement was executed to restart the current block, but
529 there isn't a current block. Note that an "if" or "else" block doesn't
530 count as a "loopish" block, as doesn't a block given to sort(). You can
531 usually double the curlies to get the same effect though, because the inner
532 curlies will be considered a block that loops once. See L<perlfunc/redo>.
534 =item Can't bless non-reference value
536 (F) Only hard references may be blessed. This is how Perl "enforces"
537 encapsulation of objects. See L<perlobj>.
539 =item Can't break at that line
541 (S) A warning intended to only be printed while running within the debugger, indicating
542 the line number specified wasn't the location of a statement that could
545 =item Can't call method "%s" in empty package "%s"
547 (F) You called a method correctly, and it correctly indicated a package
548 functioning as a class, but that package doesn't have ANYTHING defined
549 in it, let alone methods. See L<perlobj>.
551 =item Can't call method "%s" on unblessed reference
553 (F) A method call must know in what package it's supposed to run. It
554 ordinarily finds this out from the object reference you supply, but
555 you didn't supply an object reference in this case. A reference isn't
556 an object reference until it has been blessed. See L<perlobj>.
558 =item Can't call method "%s" without a package or object reference
560 (F) You used the syntax of a method call, but the slot filled by the
561 object reference or package name contains an expression that returns
562 a defined value which is neither an object reference nor a package name.
563 Something like this will reproduce the error:
566 process $BADREF 1,2,3;
567 $BADREF->process(1,2,3);
569 =item Can't call method "%s" on an undefined value
571 (F) You used the syntax of a method call, but the slot filled by the
572 object reference or package name contains an undefined value.
573 Something like this will reproduce the error:
576 process $BADREF 1,2,3;
577 $BADREF->process(1,2,3);
579 =item Can't chdir to %s
581 (F) You called C<perl -x/foo/bar>, but C</foo/bar> is not a directory
582 that you can chdir to, possibly because it doesn't exist.
584 =item Can't check filesystem of script "%s"
586 (P) For some reason you can't check the filesystem of the script for nosuid.
588 =item Can't coerce %s to integer in %s
590 (F) Certain types of SVs, in particular real symbol table entries
591 (typeglobs), can't be forced to stop being what they are. So you can't
601 but then $foo no longer contains a glob.
603 =item Can't coerce %s to number in %s
605 (F) Certain types of SVs, in particular real symbol table entries
606 (typeglobs), can't be forced to stop being what they are.
608 =item Can't coerce %s to string in %s
610 (F) Certain types of SVs, in particular real symbol table entries
611 (typeglobs), can't be forced to stop being what they are.
613 =item Can't coerce array into hash
615 (F) You used an array where a hash was expected, but the array has no
616 information on how to map from keys to array indices. You can do that
617 only with arrays that have a hash reference at index 0.
619 =item Can't create pipe mailbox
621 (P) An error peculiar to VMS. The process is suffering from exhausted quotas
622 or other plumbing problems.
624 =item Can't declare %s in my
626 (F) Only scalar, array, and hash variables may be declared as lexical variables.
627 They must have ordinary identifiers as names.
629 =item Can't do inplace edit on %s: %s
631 (S) The creation of the new file failed for the indicated reason.
633 =item Can't do inplace edit without backup
635 (F) You're on a system such as MS-DOS that gets confused if you try reading
636 from a deleted (but still opened) file. You have to say C<-i.bak>, or some
639 =item Can't do inplace edit: %s E<gt> 14 characters
641 (S) There isn't enough room in the filename to make a backup name for the file.
643 =item Can't do inplace edit: %s is not a regular file
645 (S) You tried to use the B<-i> switch on a special file, such as a file in
646 /dev, or a FIFO. The file was ignored.
648 =item Can't do setegid!
650 (P) The setegid() call failed for some reason in the setuid emulator
653 =item Can't do seteuid!
655 (P) The setuid emulator of suidperl failed for some reason.
657 =item Can't do setuid
659 (F) This typically means that ordinary perl tried to exec suidperl to
660 do setuid emulation, but couldn't exec it. It looks for a name of the
661 form sperl5.000 in the same directory that the perl executable resides
662 under the name perl5.000, typically /usr/local/bin on Unix machines.
663 If the file is there, check the execute permissions. If it isn't, ask
664 your sysadmin why he and/or she removed it.
666 =item Can't do waitpid with flags
668 (F) This machine doesn't have either waitpid() or wait4(), so only waitpid()
669 without flags is emulated.
671 =item Can't do {n,m} with n E<gt> m
673 (F) Minima must be less than or equal to maxima. If you really want
674 your regexp to match something 0 times, just put {0}. See L<perlre>.
676 =item Can't emulate -%s on #! line
678 (F) The #! line specifies a switch that doesn't make sense at this point.
679 For example, it'd be kind of silly to put a B<-x> on the #! line.
681 =item Can't exec "%s": %s
683 (W) An system(), exec(), or piped open call could not execute the named
684 program for the indicated reason. Typical reasons include: the permissions
685 were wrong on the file, the file wasn't found in C<$ENV{PATH}>, the
686 executable in question was compiled for another architecture, or the
687 #! line in a script points to an interpreter that can't be run for
688 similar reasons. (Or maybe your system doesn't support #! at all.)
692 (F) Perl was trying to execute the indicated program for you because that's
693 what the #! line said. If that's not what you wanted, you may need to
694 mention "perl" on the #! line somewhere.
696 =item Can't execute %s
698 (F) You used the B<-S> switch, but the copies of the script to execute found
699 in the PATH did not have correct permissions.
701 =item Can't find %s on PATH, '.' not in PATH
703 (F) You used the B<-S> switch, but the script to execute could not be found
704 in the PATH, or at least not with the correct permissions. The script
705 exists in the current directory, but PATH prohibits running it.
707 =item Can't find %s on PATH
709 (F) You used the B<-S> switch, but the script to execute could not be found
712 =item Can't find label %s
714 (F) You said to goto a label that isn't mentioned anywhere that it's possible
715 for us to go to. See L<perlfunc/goto>.
717 =item Can't find string terminator %s anywhere before EOF
719 (F) Perl strings can stretch over multiple lines. This message means that
720 the closing delimiter was omitted. Because bracketed quotes count nesting
721 levels, the following is missing its final parenthesis:
723 print q(The character '(' starts a side comment.);
725 If you're getting this error from a here-document, you may have
726 included unseen whitespace before or after your closing tag. A good
727 programmer's editor will have a way to help you find these characters.
731 (F) A fatal error occurred while trying to fork while opening a pipeline.
733 =item Can't get filespec - stale stat buffer?
735 (S) A warning peculiar to VMS. This arises because of the difference between
736 access checks under VMS and under the Unix model Perl assumes. Under VMS,
737 access checks are done by filename, rather than by bits in the stat buffer, so
738 that ACLs and other protections can be taken into account. Unfortunately, Perl
739 assumes that the stat buffer contains all the necessary information, and passes
740 it, instead of the filespec, to the access checking routine. It will try to
741 retrieve the filespec using the device name and FID present in the stat buffer,
742 but this works only if you haven't made a subsequent call to the CRTL stat()
743 routine, because the device name is overwritten with each call. If this warning
744 appears, the name lookup failed, and the access checking routine gave up and
745 returned FALSE, just to be conservative. (Note: The access checking routine
746 knows about the Perl C<stat> operator and file tests, so you shouldn't ever
747 see this warning in response to a Perl command; it arises only if some internal
748 code takes stat buffers lightly.)
750 =item Can't get pipe mailbox device name
752 (P) An error peculiar to VMS. After creating a mailbox to act as a pipe, Perl
753 can't retrieve its name for later use.
755 =item Can't get SYSGEN parameter value for MAXBUF
757 (P) An error peculiar to VMS. Perl asked $GETSYI how big you want your
758 mailbox buffers to be, and didn't get an answer.
760 =item Can't goto subroutine outside a subroutine
762 (F) The deeply magical "goto subroutine" call can only replace one subroutine
763 call for another. It can't manufacture one out of whole cloth. In general
764 you should be calling it out of only an AUTOLOAD routine anyway. See
767 =item Can't goto subroutine from an eval-string
769 (F) The "goto subroutine" call can't be used to jump out of an eval "string".
770 (You can use it to jump out of an eval {BLOCK}, but you probably don't want to.)
772 =item Can't localize through a reference
774 (F) You said something like C<local $$ref>, which Perl can't currently
775 handle, because when it goes to restore the old value of whatever $ref
776 pointed to after the scope of the local() is finished, it can't be
777 sure that $ref will still be a reference.
779 =item Can't localize lexical variable %s
781 (F) You used local on a variable name that was previously declared as a
782 lexical variable using "my". This is not allowed. If you want to
783 localize a package variable of the same name, qualify it with the
786 =item Can't localize pseudo-hash element
788 (F) You said something like C<local $ar-E<gt>{'key'}>, where $ar is
789 a reference to a pseudo-hash. That hasn't been implemented yet, but
790 you can get a similar effect by localizing the corresponding array
791 element directly -- C<local $ar-E<gt>[$ar-E<gt>[0]{'key'}]>.
793 =item Can't locate auto/%s.al in @INC
795 (F) A function (or method) was called in a package which allows autoload,
796 but there is no function to autoload. Most probable causes are a misprint
797 in a function/method name or a failure to C<AutoSplit> the file, say, by
798 doing C<make install>.
800 =item Can't locate %s
802 (F) You said to C<do> (or C<require>, or C<use>) a file that couldn't be
803 found. Perl looks for the file in all the locations mentioned in @INC,
804 unless the file name included the full path to the file. Perhaps you need
805 to set the PERL5LIB or PERL5OPT environment variable to say where the extra
806 library is, or maybe the script needs to add the library name to @INC. Or
807 maybe you just misspelled the name of the file. See L<perlfunc/require>
810 =item Can't locate object method "%s" via package "%s"
812 (F) You called a method correctly, and it correctly indicated a package
813 functioning as a class, but that package doesn't define that particular
814 method, nor does any of its base classes. See L<perlobj>.
816 =item Can't locate package %s for @%s::ISA
818 (W) The @ISA array contained the name of another package that doesn't seem
821 =item Can't make list assignment to \%ENV on this system
823 (F) List assignment to %ENV is not supported on some systems, notably VMS.
825 =item Can't modify %s in %s
827 (F) You aren't allowed to assign to the item indicated, or otherwise try to
828 change it, such as with an auto-increment.
830 =item Can't modify nonexistent substring
832 (P) The internal routine that does assignment to a substr() was handed
835 =item Can't msgrcv to read-only var
837 (F) The target of a msgrcv must be modifiable to be used as a receive
840 =item Can't open %s: %s
842 (S) The implicit opening of a file through use of the C<E<lt>E<gt>>
843 filehandle, either implicitly under the C<-n> or C<-p> command-line
844 switches, or explicitly, failed for the indicated reason. Usually this
845 is because you don't have read permission for a file which you named
848 =item Can't open bidirectional pipe
850 (W) You tried to say C<open(CMD, "|cmd|")>, which is not supported. You can
851 try any of several modules in the Perl library to do this, such as
852 IPC::Open2. Alternately, direct the pipe's output to a file using "E<gt>",
853 and then read it in under a different file handle.
855 =item Can't open error file %s as stderr
857 (F) An error peculiar to VMS. Perl does its own command line redirection, and
858 couldn't open the file specified after '2E<gt>' or '2E<gt>E<gt>' on the
859 command line for writing.
861 =item Can't open input file %s as stdin
863 (F) An error peculiar to VMS. Perl does its own command line redirection, and
864 couldn't open the file specified after 'E<lt>' on the command line for reading.
866 =item Can't open output file %s as stdout
868 (F) An error peculiar to VMS. Perl does its own command line redirection, and
869 couldn't open the file specified after 'E<gt>' or 'E<gt>E<gt>' on the command
872 =item Can't open output pipe (name: %s)
874 (P) An error peculiar to VMS. Perl does its own command line redirection, and
875 couldn't open the pipe into which to send data destined for stdout.
877 =item Can't open perl script "%s": %s
879 (F) The script you specified can't be opened for the indicated reason.
881 =item Can't redefine active sort subroutine %s
883 (F) Perl optimizes the internal handling of sort subroutines and keeps
884 pointers into them. You tried to redefine one such sort subroutine when it
885 was currently active, which is not allowed. If you really want to do
886 this, you should write C<sort { &func } @x> instead of C<sort func @x>.
888 =item Can't rename %s to %s: %s, skipping file
890 (S) The rename done by the B<-i> switch failed for some reason, probably because
891 you don't have write permission to the directory.
893 =item Can't reopen input pipe (name: %s) in binary mode
895 (P) An error peculiar to VMS. Perl thought stdin was a pipe, and tried to
896 reopen it to accept binary data. Alas, it failed.
898 =item Can't reswap uid and euid
900 (P) The setreuid() call failed for some reason in the setuid emulator
903 =item Can't return outside a subroutine
905 (F) The return statement was executed in mainline code, that is, where
906 there was no subroutine call to return out of. See L<perlsub>.
908 =item Can't stat script "%s"
910 (P) For some reason you can't fstat() the script even though you have
911 it open already. Bizarre.
913 =item Can't swap uid and euid
915 (P) The setreuid() call failed for some reason in the setuid emulator
918 =item Can't take log of %g
920 (F) For ordinary real numbers, you can't take the logarithm of a
921 negative number or zero. There's a Math::Complex package that comes
922 standard with Perl, though, if you really want to do that for
923 the negative numbers.
925 =item Can't take sqrt of %g
927 (F) For ordinary real numbers, you can't take the square root of a
928 negative number. There's a Math::Complex package that comes standard
929 with Perl, though, if you really want to do that.
931 =item Can't undef active subroutine
933 (F) You can't undefine a routine that's currently running. You can,
934 however, redefine it while it's running, and you can even undef the
935 redefined subroutine while the old routine is running. Go figure.
939 (F) You tried to unshift an "unreal" array that can't be unshifted, such
940 as the main Perl stack.
942 =item Can't upgrade that kind of scalar
944 (P) The internal sv_upgrade routine adds "members" to an SV, making
945 it into a more specialized kind of SV. The top several SV types are
946 so specialized, however, that they cannot be interconverted. This
947 message indicates that such a conversion was attempted.
949 =item Can't upgrade to undef
951 (P) The undefined SV is the bottom of the totem pole, in the scheme
952 of upgradability. Upgrading to undef indicates an error in the
953 code calling sv_upgrade.
955 =item Can't use %%! because Errno.pm is not available
957 (F) The first time the %! hash is used, perl automatically loads the
958 Errno.pm module. The Errno module is expected to tie the %! hash to
959 provide symbolic names for C<$!> errno values.
961 =item Can't use "my %s" in sort comparison
963 (F) The global variables $a and $b are reserved for sort comparisons.
964 You mentioned $a or $b in the same line as the E<lt>=E<gt> or cmp operator,
965 and the variable had earlier been declared as a lexical variable.
966 Either qualify the sort variable with the package name, or rename the
969 =item Bad evalled substitution pattern
971 (F) You've used the /e switch to evaluate the replacement for a
972 substitution, but perl found a syntax error in the code to evaluate,
973 most likely an unexpected right brace '}'.
975 =item Can't use %s for loop variable
977 (F) Only a simple scalar variable may be used as a loop variable on a foreach.
979 =item Can't use %s ref as %s ref
981 (F) You've mixed up your reference types. You have to dereference a
982 reference of the type needed. You can use the ref() function to
983 test the type of the reference, if need be.
985 =item Can't use \1 to mean $1 in expression
987 (W) In an ordinary expression, backslash is a unary operator that creates
988 a reference to its argument. The use of backslash to indicate a backreference
989 to a matched substring is valid only as part of a regular expression pattern.
990 Trying to do this in ordinary Perl code produces a value that prints
991 out looking like SCALAR(0xdecaf). Use the $1 form instead.
993 =item Can't use bareword ("%s") as %s ref while \"strict refs\" in use
995 (F) Only hard references are allowed by "strict refs". Symbolic references
996 are disallowed. See L<perlref>.
998 =item Can't use string ("%s") as %s ref while "strict refs" in use
1000 (F) Only hard references are allowed by "strict refs". Symbolic references
1001 are disallowed. See L<perlref>.
1003 =item Can't use an undefined value as %s reference
1005 (F) A value used as either a hard reference or a symbolic reference must
1006 be a defined value. This helps to delurk some insidious errors.
1008 =item Can't use global %s in "my"
1010 (F) You tried to declare a magical variable as a lexical variable. This is
1011 not allowed, because the magic can be tied to only one location (namely
1012 the global variable) and it would be incredibly confusing to have
1013 variables in your program that looked like magical variables but
1016 =item Can't use subscript on %s
1018 (F) The compiler tried to interpret a bracketed expression as a
1019 subscript. But to the left of the brackets was an expression that
1020 didn't look like an array reference, or anything else subscriptable.
1022 =item Can't weaken a nonreference
1024 (F) You attempted to weaken something that was not a reference. Only
1025 references can be weakened.
1027 =item Can't x= to read-only value
1029 (F) You tried to repeat a constant value (often the undefined value) with
1030 an assignment operator, which implies modifying the value itself.
1031 Perhaps you need to copy the value to a temporary, and repeat that.
1033 =item Can't find an opnumber for "%s"
1035 (F) A string of a form C<CORE::word> was given to prototype(), but
1036 there is no builtin with the name C<word>.
1038 =item Can't resolve method `%s' overloading `%s' in package `%s'
1040 (F|P) Error resolving overloading specified by a method name (as
1041 opposed to a subroutine reference): no such method callable via the
1042 package. If method name is C<???>, this is an internal error.
1044 =item Character class [:%s:] unknown
1046 (F) The class in the character class [: :] syntax is unknown.
1048 =item Character class syntax [%s] belongs inside character classes
1050 (W) The character class constructs [: :], [= =], and [. .] go
1051 I<inside> character classes, the [] are part of the construct,
1052 for example: /[012[:alpha:]345]/. Note that the last two constructs
1053 are not currently implemented, they are placeholders for future extensions.
1055 =item Character class syntax [. .] is reserved for future extensions
1057 (W) Within regular expression character classes ([]) the syntax beginning
1058 with "[." and ending with ".]" is reserved for future extensions.
1059 If you need to represent those character sequences inside a regular
1060 expression character class, just quote the square brackets with the
1061 backslash: "\[." and ".\]".
1063 =item Character class syntax [= =] is reserved for future extensions
1065 (W) Within regular expression character classes ([]) the syntax
1066 beginning with "[=" and ending with "=]" is reserved for future extensions.
1067 If you need to represent those character sequences inside a regular
1068 expression character class, just quote the square brackets with the
1069 backslash: "\[=" and "=\]".
1071 =item chmod: mode argument is missing initial 0
1073 (W) A novice will sometimes say
1075 chmod 777, $filename
1077 not realizing that 777 will be interpreted as a decimal number, equivalent
1078 to 01411. Octal constants are introduced with a leading 0 in Perl, as in C.
1080 =item Close on unopened file E<lt>%sE<gt>
1082 (W) You tried to close a filehandle that was never opened.
1084 =item Compilation failed in require
1086 (F) Perl could not compile a file specified in a C<require> statement.
1087 Perl uses this generic message when none of the errors that it encountered
1088 were severe enough to halt compilation immediately.
1090 =item Complex regular subexpression recursion limit (%d) exceeded
1092 (W) The regular expression engine uses recursion in complex situations
1093 where back-tracking is required. Recursion depth is limited to 32766,
1094 or perhaps less in architectures where the stack cannot grow
1095 arbitrarily. ("Simple" and "medium" situations are handled without
1096 recursion and are not subject to a limit.) Try shortening the string
1097 under examination; looping in Perl code (e.g. with C<while>) rather
1098 than in the regular expression engine; or rewriting the regular
1099 expression so that it is simpler or backtracks less. (See L<perlbook>
1100 for information on I<Mastering Regular Expressions>.)
1102 =item connect() on closed fd
1104 (W) You tried to do a connect on a closed socket. Did you forget to check
1105 the return value of your socket() call? See L<perlfunc/connect>.
1107 =item Constant is not %s reference
1109 (F) A constant value (perhaps declared using the C<use constant> pragma)
1110 is being dereferenced, but it amounts to the wrong type of reference. The
1111 message indicates the type of reference that was expected. This usually
1112 indicates a syntax error in dereferencing the constant value.
1113 See L<perlsub/"Constant Functions"> and L<constant>.
1115 =item Constant subroutine %s redefined
1117 (S) You redefined a subroutine which had previously been eligible for
1118 inlining. See L<perlsub/"Constant Functions"> for commentary and
1121 =item Constant subroutine %s undefined
1123 (S) You undefined a subroutine which had previously been eligible for
1124 inlining. See L<perlsub/"Constant Functions"> for commentary and
1127 =item Copy method did not return a reference
1129 (F) The method which overloads "=" is buggy. See L<overload/Copy Constructor>.
1131 =item Corrupt malloc ptr 0x%lx at 0x%lx
1133 (P) The malloc package that comes with Perl had an internal failure.
1135 =item corrupted regexp pointers
1137 (P) The regular expression engine got confused by what the regular
1138 expression compiler gave it.
1140 =item corrupted regexp program
1142 (P) The regular expression engine got passed a regexp program without
1143 a valid magic number.
1145 =item Deep recursion on subroutine "%s"
1147 (W) This subroutine has called itself (directly or indirectly) 100
1148 times more than it has returned. This probably indicates an infinite
1149 recursion, unless you're writing strange benchmark programs, in which
1150 case it indicates something else.
1152 =item defined(@array) is deprecated
1154 (D) defined() is not usually useful on arrays because it checks for an
1155 undefined I<scalar> value. If you want to see if the array is empty,
1156 just use C<if (@array) { # not empty }> for example.
1158 =item defined(%hash) is deprecated
1160 (D) defined() is not usually useful on hashes because it checks for an
1161 undefined I<scalar> value. If you want to see if the hash is empty,
1162 just use C<if (%hash) { # not empty }> for example.
1164 =item Delimiter for here document is too long
1166 (F) In a here document construct like C<E<lt>E<lt>FOO>, the label
1167 C<FOO> is too long for Perl to handle. You have to be seriously
1168 twisted to write code that triggers this error.
1170 =item Did you mean &%s instead?
1172 (W) You probably referred to an imported subroutine &FOO as $FOO or some such.
1174 =item Did you mean $ or @ instead of %?
1176 (W) You probably said %hash{$key} when you meant $hash{$key} or @hash{@keys}.
1177 On the other hand, maybe you just meant %hash and got carried away.
1181 (F) You passed die() an empty string (the equivalent of C<die "">) or
1182 you called it with no args and both C<$@> and C<$_> were empty.
1184 =item Do you need to predeclare %s?
1186 (S) This is an educated guess made in conjunction with the message "%s
1187 found where operator expected". It often means a subroutine or module
1188 name is being referenced that hasn't been declared yet. This may be
1189 because of ordering problems in your file, or because of a missing
1190 "sub", "package", "require", or "use" statement. If you're
1191 referencing something that isn't defined yet, you don't actually have
1192 to define the subroutine or package before the current location. You
1193 can use an empty "sub foo;" or "package FOO;" to enter a "forward"
1196 =item Don't know how to handle magic of type '%s'
1198 (P) The internal handling of magical variables has been cursed.
1200 =item do_study: out of memory
1202 (P) This should have been caught by safemalloc() instead.
1204 =item Duplicate free() ignored
1206 (S) An internal routine called free() on something that had already
1209 =item elseif should be elsif
1211 (S) There is no keyword "elseif" in Perl because Larry thinks it's
1212 ugly. Your code will be interpreted as an attempt to call a method
1213 named "elseif" for the class returned by the following block. This is
1214 unlikely to be what you want.
1216 =item END failed--cleanup aborted
1218 (F) An untrapped exception was raised while executing an END subroutine.
1219 The interpreter is immediately exited.
1221 =item entering effective %s failed
1223 (F) While under the C<use filetest> pragma, switching the real and
1224 effective uids or gids failed.
1226 =item Error converting file specification %s
1228 (F) An error peculiar to VMS. Because Perl may have to deal with file
1229 specifications in either VMS or Unix syntax, it converts them to a
1230 single form when it must operate on them directly. Either you've
1231 passed an invalid file specification to Perl, or you've found a
1232 case the conversion routines don't handle. Drat.
1234 =item %s: Eval-group in insecure regular expression
1236 (F) Perl detected tainted data when trying to compile a regular expression
1237 that contains the C<(?{ ... })> zero-width assertion, which is unsafe.
1238 See L<perlre/(?{ code })>, and L<perlsec>.
1240 =item %s: Eval-group not allowed, use re 'eval'
1242 (F) A regular expression contained the C<(?{ ... })> zero-width assertion,
1243 but that construct is only allowed when the C<use re 'eval'> pragma is
1244 in effect. See L<perlre/(?{ code })>.
1246 =item %s: Eval-group not allowed at run time
1248 (F) Perl tried to compile a regular expression containing the C<(?{ ... })>
1249 zero-width assertion at run time, as it would when the pattern contains
1250 interpolated values. Since that is a security risk, it is not allowed.
1251 If you insist, you may still do this by explicitly building the pattern
1252 from an interpolated string at run time and using that in an eval().
1253 See L<perlre/(?{ code })>.
1255 =item Excessively long <> operator
1257 (F) The contents of a <> operator may not exceed the maximum size of a
1258 Perl identifier. If you're just trying to glob a long list of
1259 filenames, try using the glob() operator, or put the filenames into a
1260 variable and glob that.
1262 =item Execution of %s aborted due to compilation errors
1264 (F) The final summary message when a Perl compilation fails.
1266 =item Exiting eval via %s
1268 (W) You are exiting an eval by unconventional means, such as
1269 a goto, or a loop control statement.
1271 =item Exiting pseudo-block via %s
1273 (W) You are exiting a rather special block construct (like a sort block or
1274 subroutine) by unconventional means, such as a goto, or a loop control
1275 statement. See L<perlfunc/sort>.
1277 =item Exiting subroutine via %s
1279 (W) You are exiting a subroutine by unconventional means, such as
1280 a goto, or a loop control statement.
1282 =item Exiting substitution via %s
1284 (W) You are exiting a substitution by unconventional means, such as
1285 a return, a goto, or a loop control statement.
1287 =item Explicit blessing to '' (assuming package main)
1289 (W) You are blessing a reference to a zero length string. This has
1290 the effect of blessing the reference into the package main. This is
1291 usually not what you want. Consider providing a default target
1292 package, e.g. bless($ref, $p || 'MyPackage');
1294 =item Fatal VMS error at %s, line %d
1296 (P) An error peculiar to VMS. Something untoward happened in a VMS system
1297 service or RTL routine; Perl's exit status should provide more details. The
1298 filename in "at %s" and the line number in "line %d" tell you which section of
1299 the Perl source code is distressed.
1301 =item fcntl is not implemented
1303 (F) Your machine apparently doesn't implement fcntl(). What is this, a
1304 PDP-11 or something?
1306 =item Filehandle %s never opened
1308 (W) An I/O operation was attempted on a filehandle that was never initialized.
1309 You need to do an open() or a socket() call, or call a constructor from
1310 the FileHandle package.
1312 =item Filehandle %s opened only for input
1314 (W) You tried to write on a read-only filehandle. If you
1315 intended it to be a read-write filehandle, you needed to open it with
1316 "+E<lt>" or "+E<gt>" or "+E<gt>E<gt>" instead of with "E<lt>" or nothing. If
1317 you intended only to write the file, use "E<gt>" or "E<gt>E<gt>". See
1320 =item Filehandle %s opened only for output
1322 (W) You tried to read from a filehandle opened only for writing. If you
1323 intended it to be a read-write filehandle, you needed to open it with
1324 "+E<lt>" or "+E<gt>" or "+E<gt>E<gt>" instead of with "E<lt>" or nothing. If
1325 you intended only to read from the file, use "E<lt>". See
1328 =item Final $ should be \$ or $name
1330 (F) You must now decide whether the final $ in a string was meant to be
1331 a literal dollar sign, or was meant to introduce a variable name
1332 that happens to be missing. So you have to put either the backslash or
1335 =item Final @ should be \@ or @name
1337 (F) You must now decide whether the final @ in a string was meant to be
1338 a literal "at" sign, or was meant to introduce a variable name
1339 that happens to be missing. So you have to put either the backslash or
1342 =item Format %s redefined
1344 (W) You redefined a format. To suppress this warning, say
1348 eval "format NAME =...";
1351 =item Format not terminated
1353 (F) A format must be terminated by a line with a solitary dot. Perl got
1354 to the end of your file without finding such a line.
1356 =item Found = in conditional, should be ==
1366 (or something like that).
1368 =item gdbm store returned %d, errno %d, key "%s"
1370 (S) A warning from the GDBM_File extension that a store failed.
1372 =item gethostent not implemented
1374 (F) Your C library apparently doesn't implement gethostent(), probably
1375 because if it did, it'd feel morally obligated to return every hostname
1378 =item get{sock,peer}name() on closed fd
1380 (W) You tried to get a socket or peer socket name on a closed socket.
1381 Did you forget to check the return value of your socket() call?
1383 =item getpwnam returned invalid UIC %#o for user "%s"
1385 (S) A warning peculiar to VMS. The call to C<sys$getuai> underlying the
1386 C<getpwnam> operator returned an invalid UIC.
1388 =item Glob not terminated
1390 (F) The lexer saw a left angle bracket in a place where it was expecting
1391 a term, so it's looking for the corresponding right angle bracket, and not
1392 finding it. Chances are you left some needed parentheses out earlier in
1393 the line, and you really meant a "less than".
1395 =item Global symbol "%s" requires explicit package name
1397 (F) You've said "use strict vars", which indicates that all variables
1398 must either be lexically scoped (using "my"), or explicitly qualified to
1399 say which package the global variable is in (using "::").
1401 =item goto must have label
1403 (F) Unlike with "next" or "last", you're not allowed to goto an
1404 unspecified destination. See L<perlfunc/goto>.
1406 =item Had to create %s unexpectedly
1408 (S) A routine asked for a symbol from a symbol table that ought to have
1409 existed already, but for some reason it didn't, and had to be created on
1410 an emergency basis to prevent a core dump.
1412 =item Hash %%s missing the % in argument %d of %s()
1414 (D) Really old Perl let you omit the % on hash names in some spots. This
1415 is now heavily deprecated.
1417 =item Identifier too long
1419 (F) Perl limits identifiers (names for variables, functions, etc.) to
1420 about 250 characters for simple names, and somewhat more for compound
1421 names (like C<$A::B>). You've exceeded Perl's limits. Future
1422 versions of Perl are likely to eliminate these arbitrary limitations.
1424 =item Ill-formed CRTL environ value "%s"
1426 (W) A warning peculiar to VMS. Perl tried to read the CRTL's internal
1427 environ array, and encountered an element without the C<=> delimiter
1428 used to spearate keys from values. The element is ignored.
1430 =item Ill-formed message in prime_env_iter: |%s|
1432 (W) A warning peculiar to VMS. Perl tried to read a logical name
1433 or CLI symbol definition when preparing to iterate over %ENV, and
1434 didn't see the expected delimiter between key and value, so the
1437 =item Illegal character %s (carriage return)
1439 (F) A carriage return character was found in the input. This is an
1440 error, and not a warning, because carriage return characters can break
1441 multi-line strings, including here documents (e.g., C<print E<lt>E<lt>EOF;>).
1443 Under Unix, this error is usually caused by executing Perl code --
1444 either the main program, a module, or an eval'd string -- that was
1445 transferred over a network connection from a non-Unix system without
1446 properly converting the text file format.
1448 Under systems that use something other than '\n' to delimit lines of
1449 text, this error can also be caused by reading Perl code from a file
1450 handle that is in binary mode (as set by the C<binmode> operator).
1452 In either case, the Perl code in question will probably need to be
1453 converted with something like C<s/\x0D\x0A?/\n/g> before it can be
1456 =item Illegal division by zero
1458 (F) You tried to divide a number by 0. Either something was wrong in your
1459 logic, or you need to put a conditional in to guard against meaningless input.
1461 =item Illegal modulus zero
1463 (F) You tried to divide a number by 0 to get the remainder. Most numbers
1464 don't take to this kindly.
1466 =item Illegal binary digit %s
1468 (F) You used a digit other than 0 and 1 in a binary number.
1470 =item Illegal octal digit %s
1472 (F) You used an 8 or 9 in a octal number.
1474 =item Illegal binary digit %s ignored
1476 (W) You may have tried to use a digit other than 0 or 1 in a binary number.
1477 Interpretation of the binary number stopped before the offending digit.
1479 =item Illegal octal digit %s ignored
1481 (W) You may have tried to use an 8 or 9 in a octal number. Interpretation
1482 of the octal number stopped before the 8 or 9.
1484 =item Illegal hexadecimal digit %s ignored
1486 (W) You may have tried to use a character other than 0 - 9 or A - F in a
1487 hexadecimal number. Interpretation of the hexadecimal number stopped
1488 before the illegal character.
1490 =item Illegal switch in PERL5OPT: %s
1492 (X) The PERL5OPT environment variable may only be used to set the
1493 following switches: B<-[DIMUdmw]>.
1495 =item In string, @%s now must be written as \@%s
1497 (F) It used to be that Perl would try to guess whether you wanted an
1498 array interpolated or a literal @. It did this when the string was first
1499 used at runtime. Now strings are parsed at compile time, and ambiguous
1500 instances of @ must be disambiguated, either by prepending a backslash to
1501 indicate a literal, or by declaring (or using) the array within the
1502 program before the string (lexically). (Someday it will simply assume
1503 that an unbackslashed @ interpolates an array.)
1505 =item Insecure dependency in %s
1507 (F) You tried to do something that the tainting mechanism didn't like.
1508 The tainting mechanism is turned on when you're running setuid or setgid,
1509 or when you specify B<-T> to turn it on explicitly. The tainting mechanism
1510 labels all data that's derived directly or indirectly from the user,
1511 who is considered to be unworthy of your trust. If any such data is
1512 used in a "dangerous" operation, you get this error. See L<perlsec>
1513 for more information.
1515 =item Insecure directory in %s
1517 (F) You can't use system(), exec(), or a piped open in a setuid or setgid
1518 script if C<$ENV{PATH}> contains a directory that is writable by the world.
1521 =item Insecure $ENV{%s} while running %s
1523 (F) You can't use system(), exec(), or a piped open in a setuid or
1524 setgid script if any of C<$ENV{PATH}>, C<$ENV{IFS}>, C<$ENV{CDPATH}>,
1525 C<$ENV{ENV}> or C<$ENV{BASH_ENV}> are derived from data supplied (or
1526 potentially supplied) by the user. The script must set the path to a
1527 known value, using trustworthy data. See L<perlsec>.
1529 =item Integer overflow in %s number
1531 (S) The literal hexadecimal, octal or binary number you have specified
1532 is too big for your architecture. On a 32-bit architecture the largest
1533 literal hex, octal or binary number representable without overflow
1534 is 0xFFFFFFFF, 037777777777, or 0b11111111111111111111111111111111
1535 respectively. Note that Perl transparently promotes decimal literals
1536 to a floating point representation internally--subject to loss of
1537 precision errors in subsequent operations--so this limit usually
1538 doesn't apply to decimal literals.
1540 =item Internal inconsistency in tracking vforks
1542 (S) A warning peculiar to VMS. Perl keeps track of the number
1543 of times you've called C<fork> and C<exec>, to determine
1544 whether the current call to C<exec> should affect the current
1545 script or a subprocess (see L<perlvms/"exec LIST">). Somehow, this count
1546 has become scrambled, so Perl is making a guess and treating
1547 this C<exec> as a request to terminate the Perl script
1548 and execute the specified command.
1550 =item internal disaster in regexp
1552 (P) Something went badly wrong in the regular expression parser.
1554 =item glob failed (%s)
1556 (W) Something went wrong with the external program(s) used for C<glob>
1557 and C<E<lt>*.cE<gt>>. Usually, this means that you supplied a C<glob>
1558 pattern that caused the external program to fail and exit with a nonzero
1559 status. If the message indicates that the abnormal exit resulted in a
1560 coredump, this may also mean that your csh (C shell) is broken. If so,
1561 you should change all of the csh-related variables in config.sh: If you
1562 have tcsh, make the variables refer to it as if it were csh (e.g.
1563 C<full_csh='/usr/bin/tcsh'>); otherwise, make them all empty (except that
1564 C<d_csh> should be C<'undef'>) so that Perl will think csh is missing.
1565 In either case, after editing config.sh, run C<./Configure -S> and
1568 =item internal urp in regexp at /%s/
1570 (P) Something went badly awry in the regular expression parser.
1572 =item invalid [] range in regexp
1574 (F) The range specified in a character class had a minimum character
1575 greater than the maximum character. See L<perlre>.
1577 =item Invalid conversion in %s: "%s"
1579 (W) Perl does not understand the given format conversion.
1580 See L<perlfunc/sprintf>.
1582 =item Invalid type in pack: '%s'
1584 (F) The given character is not a valid pack type. See L<perlfunc/pack>.
1585 (W) The given character is not a valid pack type but used to be silently
1588 =item Invalid type in unpack: '%s'
1590 (F) The given character is not a valid unpack type. See L<perlfunc/unpack>.
1591 (W) The given character is not a valid unpack type but used to be silently
1594 =item ioctl is not implemented
1596 (F) Your machine apparently doesn't implement ioctl(), which is pretty
1597 strange for a machine that supports C.
1599 =item junk on end of regexp
1601 (P) The regular expression parser is confused.
1603 =item Label not found for "last %s"
1605 (F) You named a loop to break out of, but you're not currently in a
1606 loop of that name, not even if you count where you were called from.
1607 See L<perlfunc/last>.
1609 =item Label not found for "next %s"
1611 (F) You named a loop to continue, but you're not currently in a loop of
1612 that name, not even if you count where you were called from. See
1615 =item Label not found for "redo %s"
1617 (F) You named a loop to restart, but you're not currently in a loop of
1618 that name, not even if you count where you were called from. See
1621 =item leaving effective %s failed
1623 (F) While under the C<use filetest> pragma, switching the real and
1624 effective uids or gids failed.
1626 =item listen() on closed fd
1628 (W) You tried to do a listen on a closed socket. Did you forget to check
1629 the return value of your socket() call? See L<perlfunc/listen>.
1631 =item Method for operation %s not found in package %s during blessing
1633 (F) An attempt was made to specify an entry in an overloading table that
1634 doesn't resolve to a valid subroutine. See L<overload>.
1636 =item Might be a runaway multi-line %s string starting on line %d
1638 (S) An advisory indicating that the previous error may have been caused
1639 by a missing delimiter on a string or pattern, because it eventually
1640 ended earlier on the current line.
1642 =item Misplaced _ in number
1644 (W) An underline in a decimal constant wasn't on a 3-digit boundary.
1646 =item Missing $ on loop variable
1648 (F) Apparently you've been programming in B<csh> too much. Variables are always
1649 mentioned with the $ in Perl, unlike in the shells, where it can vary from
1650 one line to the next.
1652 =item Missing comma after first argument to %s function
1654 (F) While certain functions allow you to specify a filehandle or an
1655 "indirect object" before the argument list, this ain't one of them.
1657 =item Missing command in piped open
1659 (W) You used the C<open(FH, "| command")> or C<open(FH, "command |")>
1660 construction, but the command was missing or blank.
1662 =item Missing operator before %s?
1664 (S) This is an educated guess made in conjunction with the message "%s
1665 found where operator expected". Often the missing operator is a comma.
1667 =item Missing right curly or square bracket
1669 (F) The lexer counted more opening curly or square brackets than
1670 closing ones. As a general rule, you'll find it's missing near the place
1671 you were last editing.
1673 =item Modification of a read-only value attempted
1675 (F) You tried, directly or indirectly, to change the value of a
1676 constant. You didn't, of course, try "2 = 1", because the compiler
1677 catches that. But an easy way to do the same thing is:
1679 sub mod { $_[0] = 1 }
1682 Another way is to assign to a substr() that's off the end of the string.
1684 =item Modification of non-creatable array value attempted, subscript %d
1686 (F) You tried to make an array value spring into existence, and the
1687 subscript was probably negative, even counting from end of the array
1690 =item Modification of non-creatable hash value attempted, subscript "%s"
1692 (P) You tried to make a hash value spring into existence, and it couldn't
1693 be created for some peculiar reason.
1695 =item Module name must be constant
1697 (F) Only a bare module name is allowed as the first argument to a "use".
1699 =item msg%s not implemented
1701 (F) You don't have System V message IPC on your system.
1703 =item Multidimensional syntax %s not supported
1705 (W) Multidimensional arrays aren't written like C<$foo[1,2,3]>. They're written
1706 like C<$foo[1][2][3]>, as in C.
1708 =item Name "%s::%s" used only once: possible typo
1710 (W) Typographical errors often show up as unique variable names.
1711 If you had a good reason for having a unique name, then just mention
1712 it again somehow to suppress the message. The C<use vars> pragma is
1713 provided for just this purpose.
1715 =item Negative length
1717 (F) You tried to do a read/write/send/recv operation with a buffer length
1718 that is less than 0. This is difficult to imagine.
1720 =item nested *?+ in regexp
1722 (F) You can't quantify a quantifier without intervening parentheses. So
1723 things like ** or +* or ?* are illegal.
1725 Note, however, that the minimal matching quantifiers, C<*?>, C<+?>, and C<??> appear
1726 to be nested quantifiers, but aren't. See L<perlre>.
1730 (F) The setuid emulator requires that scripts have a well-formed #! line
1731 even on machines that don't support the #! construct.
1733 =item No %s allowed while running setuid
1735 (F) Certain operations are deemed to be too insecure for a setuid or setgid
1736 script to even be allowed to attempt. Generally speaking there will be
1737 another way to do what you want that is, if not secure, at least securable.
1740 =item No B<-e> allowed in setuid scripts
1742 (F) A setuid script can't be specified by the user.
1744 =item No comma allowed after %s
1746 (F) A list operator that has a filehandle or "indirect object" is not
1747 allowed to have a comma between that and the following arguments.
1748 Otherwise it'd be just another one of the arguments.
1750 One possible cause for this is that you expected to have imported a
1751 constant to your name space with B<use> or B<import> while no such
1752 importing took place, it may for example be that your operating system
1753 does not support that particular constant. Hopefully you did use an
1754 explicit import list for the constants you expect to see, please see
1755 L<perlfunc/use> and L<perlfunc/import>. While an explicit import list
1756 would probably have caught this error earlier it naturally does not
1757 remedy the fact that your operating system still does not support that
1758 constant. Maybe you have a typo in the constants of the symbol import
1759 list of B<use> or B<import> or in the constant name at the line where
1760 this error was triggered?
1762 =item No command into which to pipe on command line
1764 (F) An error peculiar to VMS. Perl handles its own command line redirection,
1765 and found a '|' at the end of the command line, so it doesn't know where you
1766 want to pipe the output from this command.
1768 =item No DB::DB routine defined
1770 (F) The currently executing code was compiled with the B<-d> switch,
1771 but for some reason the perl5db.pl file (or some facsimile thereof)
1772 didn't define a routine to be called at the beginning of each
1773 statement. Which is odd, because the file should have been required
1774 automatically, and should have blown up the require if it didn't parse
1777 =item No dbm on this machine
1779 (P) This is counted as an internal error, because every machine should
1780 supply dbm nowadays, because Perl comes with SDBM. See L<SDBM_File>.
1782 =item No DBsub routine
1784 (F) The currently executing code was compiled with the B<-d> switch,
1785 but for some reason the perl5db.pl file (or some facsimile thereof)
1786 didn't define a DB::sub routine to be called at the beginning of each
1787 ordinary subroutine call.
1789 =item No error file after 2E<gt> or 2E<gt>E<gt> on command line
1791 (F) An error peculiar to VMS. Perl handles its own command line redirection,
1792 and found a '2E<gt>' or a '2E<gt>E<gt>' on the command line, but can't find
1793 the name of the file to which to write data destined for stderr.
1795 =item No input file after E<lt> on command line
1797 (F) An error peculiar to VMS. Perl handles its own command line redirection,
1798 and found a 'E<lt>' on the command line, but can't find the name of the file
1799 from which to read data for stdin.
1801 =item No output file after E<gt> on command line
1803 (F) An error peculiar to VMS. Perl handles its own command line redirection,
1804 and found a lone 'E<gt>' at the end of the command line, so it doesn't know
1805 where you wanted to redirect stdout.
1807 =item No output file after E<gt> or E<gt>E<gt> on command line
1809 (F) An error peculiar to VMS. Perl handles its own command line redirection,
1810 and found a 'E<gt>' or a 'E<gt>E<gt>' on the command line, but can't find the
1811 name of the file to which to write data destined for stdout.
1813 =item No Perl script found in input
1815 (F) You called C<perl -x>, but no line was found in the file beginning
1816 with #! and containing the word "perl".
1818 =item No setregid available
1820 (F) Configure didn't find anything resembling the setregid() call for
1823 =item No setreuid available
1825 (F) Configure didn't find anything resembling the setreuid() call for
1828 =item No space allowed after B<-I>
1830 (F) The argument to B<-I> must follow the B<-I> immediately with no
1833 =item No such array field
1835 (F) You tried to access an array as a hash, but the field name used is
1836 not defined. The hash at index 0 should map all valid field names to
1837 array indices for that to work.
1839 =item No such field "%s" in variable %s of type %s
1841 (F) You tried to access a field of a typed variable where the type
1842 does not know about the field name. The field names are looked up in
1843 the %FIELDS hash in the type package at compile time. The %FIELDS hash
1844 is usually set up with the 'fields' pragma.
1846 =item No such pipe open
1848 (P) An error peculiar to VMS. The internal routine my_pclose() tried to
1849 close a pipe which hadn't been opened. This should have been caught earlier as
1850 an attempt to close an unopened filehandle.
1852 =item No such signal: SIG%s
1854 (W) You specified a signal name as a subscript to %SIG that was not recognized.
1855 Say C<kill -l> in your shell to see the valid signal names on your system.
1857 =item no UTC offset information; assuming local time is UTC
1859 (S) A warning peculiar to VMS. Perl was unable to find the local
1860 timezone offset, so it's assuming that local system time is equivalent
1861 to UTC. If it's not, define the logical name F<SYS$TIMEZONE_DIFFERENTIAL>
1862 to translate to the number of seconds which need to be added to UTC to
1865 =item Not a CODE reference
1867 (F) Perl was trying to evaluate a reference to a code value (that is, a
1868 subroutine), but found a reference to something else instead. You can
1869 use the ref() function to find out what kind of ref it really was.
1870 See also L<perlref>.
1872 =item Not a format reference
1874 (F) I'm not sure how you managed to generate a reference to an anonymous
1875 format, but this indicates you did, and that it didn't exist.
1877 =item Not a GLOB reference
1879 (F) Perl was trying to evaluate a reference to a "typeglob" (that is,
1880 a symbol table entry that looks like C<*foo>), but found a reference to
1881 something else instead. You can use the ref() function to find out
1882 what kind of ref it really was. See L<perlref>.
1884 =item Not a HASH reference
1886 (F) Perl was trying to evaluate a reference to a hash value, but
1887 found a reference to something else instead. You can use the ref()
1888 function to find out what kind of ref it really was. See L<perlref>.
1890 =item Not a perl script
1892 (F) The setuid emulator requires that scripts have a well-formed #! line
1893 even on machines that don't support the #! construct. The line must
1896 =item Not a SCALAR reference
1898 (F) Perl was trying to evaluate a reference to a scalar value, but
1899 found a reference to something else instead. You can use the ref()
1900 function to find out what kind of ref it really was. See L<perlref>.
1902 =item Not a subroutine reference
1904 (F) Perl was trying to evaluate a reference to a code value (that is, a
1905 subroutine), but found a reference to something else instead. You can
1906 use the ref() function to find out what kind of ref it really was.
1907 See also L<perlref>.
1909 =item Not a subroutine reference in overload table
1911 (F) An attempt was made to specify an entry in an overloading table that
1912 doesn't somehow point to a valid subroutine. See L<overload>.
1914 =item Not an ARRAY reference
1916 (F) Perl was trying to evaluate a reference to an array value, but
1917 found a reference to something else instead. You can use the ref()
1918 function to find out what kind of ref it really was. See L<perlref>.
1920 =item Not enough arguments for %s
1922 (F) The function requires more arguments than you specified.
1924 =item Not enough format arguments
1926 (W) A format specified more picture fields than the next line supplied.
1929 =item Null filename used
1931 (F) You can't require the null filename, especially because on many machines
1932 that means the current directory! See L<perlfunc/require>.
1934 =item Null picture in formline
1936 (F) The first argument to formline must be a valid format picture
1937 specification. It was found to be empty, which probably means you
1938 supplied it an uninitialized value. See L<perlform>.
1940 =item NULL OP IN RUN
1942 (P) Some internal routine called run() with a null opcode pointer.
1946 (P) An attempt was made to realloc NULL.
1948 =item NULL regexp argument
1950 (P) The internal pattern matching routines blew it big time.
1952 =item NULL regexp parameter
1954 (P) The internal pattern matching routines are out of their gourd.
1956 =item Number too long
1958 (F) Perl limits the representation of decimal numbers in programs to about
1959 about 250 characters. You've exceeded that length. Future versions of
1960 Perl are likely to eliminate this arbitrary limitation. In the meantime,
1961 try using scientific notation (e.g. "1e6" instead of "1_000_000").
1963 =item Odd number of elements in hash assignment
1965 (S) You specified an odd number of elements to initialize a hash, which
1966 is odd, because hashes come in key/value pairs.
1968 =item Offset outside string
1970 (F) You tried to do a read/write/send/recv operation with an offset
1971 pointing outside the buffer. This is difficult to imagine.
1972 The sole exception to this is that C<sysread()>ing past the buffer
1973 will extend the buffer and zero pad the new area.
1977 (S) An internal warning that the grammar is screwed up.
1981 (S) An internal warning that the grammar is screwed up.
1983 =item Operation `%s': no method found, %s
1985 (F) An attempt was made to perform an overloaded operation for which
1986 no handler was defined. While some handlers can be autogenerated in
1987 terms of other handlers, there is no default handler for any
1988 operation, unless C<fallback> overloading key is specified to be
1989 true. See L<overload>.
1991 =item Operator or semicolon missing before %s
1993 (S) You used a variable or subroutine call where the parser was
1994 expecting an operator. The parser has assumed you really meant
1995 to use an operator, but this is highly likely to be incorrect.
1996 For example, if you say "*foo *foo" it will be interpreted as
1997 if you said "*foo * 'foo'".
1999 =item Out of memory for yacc stack
2001 (F) The yacc parser wanted to grow its stack so it could continue parsing,
2002 but realloc() wouldn't give it more memory, virtual or otherwise.
2004 =item Out of memory during request for %s
2006 (X|F) The malloc() function returned 0, indicating there was insufficient
2007 remaining memory (or virtual memory) to satisfy the request.
2009 The request was judged to be small, so the possibility to trap it
2010 depends on the way perl was compiled. By default it is not trappable.
2011 However, if compiled for this, Perl may use the contents of C<$^M> as
2012 an emergency pool after die()ing with this message. In this case the
2013 error is trappable I<once>.
2015 =item Out of memory during "large" request for %s
2017 (F) The malloc() function returned 0, indicating there was insufficient
2018 remaining memory (or virtual memory) to satisfy the request. However,
2019 the request was judged large enough (compile-time default is 64K), so
2020 a possibility to shut down by trapping this error is granted.
2022 =item Out of memory during ridiculously large request
2024 (F) You can't allocate more than 2^31+"small amount" bytes. This error
2025 is most likely to be caused by a typo in the Perl program. e.g., C<$arr[time]>
2026 instead of C<$arr[$time]>.
2030 (W) A single call to write() produced more lines than can fit on a page.
2033 =item panic: ck_grep
2035 (P) Failed an internal consistency check trying to compile a grep.
2037 =item panic: ck_split
2039 (P) Failed an internal consistency check trying to compile a split.
2041 =item panic: corrupt saved stack index
2043 (P) The savestack was requested to restore more localized values than there
2044 are in the savestack.
2046 =item panic: del_backref
2048 (P) Failed an internal consistency check while trying to reset a weak
2053 (P) We popped the context stack to an eval context, and then discovered
2054 it wasn't an eval context.
2056 =item panic: do_match
2058 (P) The internal pp_match() routine was called with invalid operational data.
2060 =item panic: do_split
2062 (P) Something terrible went wrong in setting up for the split.
2064 =item panic: do_subst
2066 (P) The internal pp_subst() routine was called with invalid operational data.
2068 =item panic: do_trans
2070 (P) The internal do_trans() routine was called with invalid operational data.
2074 (P) The library function frexp() failed, making printf("%f") impossible.
2078 (P) We popped the context stack to a context with the specified label,
2079 and then discovered it wasn't a context we know how to do a goto in.
2081 =item panic: INTERPCASEMOD
2083 (P) The lexer got into a bad state at a case modifier.
2085 =item panic: INTERPCONCAT
2087 (P) The lexer got into a bad state parsing a string with brackets.
2089 =item panic: kid popen errno read
2091 (F) forked child returned an incomprehensible message about its errno.
2095 (P) We popped the context stack to a block context, and then discovered
2096 it wasn't a block context.
2098 =item panic: leave_scope clearsv
2100 (P) A writable lexical variable became read-only somehow within the scope.
2102 =item panic: leave_scope inconsistency
2104 (P) The savestack probably got out of sync. At least, there was an
2105 invalid enum on the top of it.
2109 (P) Something requested a negative number of bytes of malloc.
2111 =item panic: magic_killbackrefs
2113 (P) Failed an internal consistency check while trying to reset all weak
2114 references to an object.
2116 =item panic: mapstart
2118 (P) The compiler is screwed up with respect to the map() function.
2120 =item panic: null array
2122 (P) One of the internal array routines was passed a null AV pointer.
2124 =item panic: pad_alloc
2126 (P) The compiler got confused about which scratch pad it was allocating
2127 and freeing temporaries and lexicals from.
2129 =item panic: pad_free curpad
2131 (P) The compiler got confused about which scratch pad it was allocating
2132 and freeing temporaries and lexicals from.
2134 =item panic: pad_free po
2136 (P) An invalid scratch pad offset was detected internally.
2138 =item panic: pad_reset curpad
2140 (P) The compiler got confused about which scratch pad it was allocating
2141 and freeing temporaries and lexicals from.
2143 =item panic: pad_sv po
2145 (P) An invalid scratch pad offset was detected internally.
2147 =item panic: pad_swipe curpad
2149 (P) The compiler got confused about which scratch pad it was allocating
2150 and freeing temporaries and lexicals from.
2152 =item panic: pad_swipe po
2154 (P) An invalid scratch pad offset was detected internally.
2156 =item panic: pp_iter
2158 (P) The foreach iterator got called in a non-loop context frame.
2160 =item panic: realloc
2162 (P) Something requested a negative number of bytes of realloc.
2164 =item panic: restartop
2166 (P) Some internal routine requested a goto (or something like it), and
2167 didn't supply the destination.
2171 (P) We popped the context stack to a subroutine or eval context, and
2172 then discovered it wasn't a subroutine or eval context.
2174 =item panic: scan_num
2176 (P) scan_num() got called on something that wasn't a number.
2178 =item panic: sv_insert
2180 (P) The sv_insert() routine was told to remove more string than there
2183 =item panic: top_env
2185 (P) The compiler attempted to do a goto, or something weird like that.
2189 (P) The lexer got into a bad state while processing a case modifier.
2191 =item Parentheses missing around "%s" list
2193 (W) You said something like
2199 my ($foo, $bar) = @_;
2201 Remember that "my" and "local" bind closer than comma.
2203 =item Perl %3.3f required--this is only version %s, stopped
2205 (F) The module in question uses features of a version of Perl more recent
2206 than the currently running version. How long has it been since you upgraded,
2207 anyway? See L<perlfunc/require>.
2209 =item Permission denied
2211 (F) The setuid emulator in suidperl decided you were up to no good.
2213 =item pid %x not a child
2215 (W) A warning peculiar to VMS. Waitpid() was asked to wait for a process which
2216 isn't a subprocess of the current process. While this is fine from VMS'
2217 perspective, it's probably not what you intended.
2219 =item POSIX getpgrp can't take an argument
2221 (F) Your C compiler uses POSIX getpgrp(), which takes no argument, unlike
2222 the BSD version, which takes a pid.
2224 =item Possible attempt to put comments in qw() list
2226 (W) qw() lists contain items separated by whitespace; as with literal
2227 strings, comment characters are not ignored, but are instead treated
2228 as literal data. (You may have used different delimiters than the
2229 parentheses shown here; braces are also frequently used.)
2231 You probably wrote something like this:
2238 when you should have written this:
2245 If you really want comments, build your list the
2246 old-fashioned way, with quotes and commas:
2250 'b', # another comment
2253 =item Possible attempt to separate words with commas
2255 (W) qw() lists contain items separated by whitespace; therefore commas
2256 aren't needed to separate the items. (You may have used different
2257 delimiters than the parentheses shown here; braces are also frequently
2260 You probably wrote something like this:
2264 which puts literal commas into some of the list items. Write it without
2265 commas if you don't want them to appear in your data:
2269 =item Possible memory corruption: %s overflowed 3rd argument
2271 (F) An ioctl() or fcntl() returned more than Perl was bargaining for.
2272 Perl guesses a reasonable buffer size, but puts a sentinel byte at the
2273 end of the buffer just in case. This sentinel byte got clobbered, and
2274 Perl assumes that memory is now corrupted. See L<perlfunc/ioctl>.
2276 =item Precedence problem: open %s should be open(%s)
2278 (S) The old irregular construct
2282 is now misinterpreted as
2286 because of the strict regularization of Perl 5's grammar into unary
2287 and list operators. (The old open was a little of both.) You must
2288 put parentheses around the filehandle, or use the new "or" operator
2291 =item print on closed filehandle %s
2293 (W) The filehandle you're printing on got itself closed sometime before now.
2294 Check your logic flow.
2296 =item printf on closed filehandle %s
2298 (W) The filehandle you're writing to got itself closed sometime before now.
2299 Check your logic flow.
2301 =item Probable precedence problem on %s
2303 (W) The compiler found a bareword where it expected a conditional,
2304 which often indicates that an || or && was parsed as part of the
2305 last argument of the previous construct, for example:
2309 =item Prototype mismatch: %s vs %s
2311 (S) The subroutine being declared or defined had previously been declared
2312 or defined with a different function prototype.
2314 =item Range iterator outside integer range
2316 (F) One (or both) of the numeric arguments to the range operator ".."
2317 are outside the range which can be represented by integers internally.
2318 One possible workaround is to force Perl to use magical string
2319 increment by prepending "0" to your numbers.
2321 =item Read on closed filehandle %s
2323 (W) The filehandle you're reading from got itself closed sometime before now.
2324 Check your logic flow.
2326 =item Reallocation too large: %lx
2328 (F) You can't allocate more than 64K on an MS-DOS machine.
2330 =item Recompile perl with B<-D>DEBUGGING to use B<-D> switch
2332 (F) You can't use the B<-D> option unless the code to produce the
2333 desired output is compiled into Perl, which entails some overhead,
2334 which is why it's currently left out of your copy.
2336 =item Recursive inheritance detected in package '%s'
2338 (F) More than 100 levels of inheritance were used. Probably indicates
2339 an unintended loop in your inheritance hierarchy.
2341 =item Recursive inheritance detected while looking for method '%s' in package '%s'
2343 (F) More than 100 levels of inheritance were encountered while invoking a
2344 method. Probably indicates an unintended loop in your inheritance hierarchy.
2346 =item Reference found where even-sized list expected
2348 (W) You gave a single reference where Perl was expecting a list with
2349 an even number of elements (for assignment to a hash). This
2350 usually means that you used the anon hash constructor when you meant
2351 to use parens. In any case, a hash requires key/value B<pairs>.
2353 %hash = { one => 1, two => 2, }; # WRONG
2354 %hash = [ qw/ an anon array / ]; # WRONG
2355 %hash = ( one => 1, two => 2, ); # right
2356 %hash = qw( one 1 two 2 ); # also fine
2358 =item Reference is already weak
2360 (W) You have attempted to weaken a reference that is already weak.
2361 Doing so has no effect.
2363 =item Reference miscount in sv_replace()
2365 (W) The internal sv_replace() function was handed a new SV with a
2366 reference count of other than 1.
2368 =item regexp *+ operand could be empty
2370 (F) The part of the regexp subject to either the * or + quantifier
2371 could match an empty string.
2373 =item regexp memory corruption
2375 (P) The regular expression engine got confused by what the regular
2376 expression compiler gave it.
2378 =item regexp out of space
2380 (P) A "can't happen" error, because safemalloc() should have caught it earlier.
2382 =item Reversed %s= operator
2384 (W) You wrote your assignment operator backwards. The = must always
2385 comes last, to avoid ambiguity with subsequent unary operators.
2387 =item Runaway format
2389 (F) Your format contained the ~~ repeat-until-blank sequence, but it
2390 produced 200 lines at once, and the 200th line looked exactly like the
2391 199th line. Apparently you didn't arrange for the arguments to exhaust
2392 themselves, either by using ^ instead of @ (for scalar variables), or by
2393 shifting or popping (for array variables). See L<perlform>.
2395 =item Scalar value @%s[%s] better written as $%s[%s]
2397 (W) You've used an array slice (indicated by @) to select a single element of
2398 an array. Generally it's better to ask for a scalar value (indicated by $).
2399 The difference is that C<$foo[&bar]> always behaves like a scalar, both when
2400 assigning to it and when evaluating its argument, while C<@foo[&bar]> behaves
2401 like a list when you assign to it, and provides a list context to its
2402 subscript, which can do weird things if you're expecting only one subscript.
2404 On the other hand, if you were actually hoping to treat the array
2405 element as a list, you need to look into how references work, because
2406 Perl will not magically convert between scalars and lists for you. See
2409 =item Scalar value @%s{%s} better written as $%s{%s}
2411 (W) You've used a hash slice (indicated by @) to select a single element of
2412 a hash. Generally it's better to ask for a scalar value (indicated by $).
2413 The difference is that C<$foo{&bar}> always behaves like a scalar, both when
2414 assigning to it and when evaluating its argument, while C<@foo{&bar}> behaves
2415 like a list when you assign to it, and provides a list context to its
2416 subscript, which can do weird things if you're expecting only one subscript.
2418 On the other hand, if you were actually hoping to treat the hash
2419 element as a list, you need to look into how references work, because
2420 Perl will not magically convert between scalars and lists for you. See
2423 =item Script is not setuid/setgid in suidperl
2425 (F) Oddly, the suidperl program was invoked on a script without a setuid
2426 or setgid bit set. This doesn't make much sense.
2428 =item Search pattern not terminated
2430 (F) The lexer couldn't find the final delimiter of a // or m{}
2431 construct. Remember that bracketing delimiters count nesting level.
2432 Missing the leading C<$> from a variable C<$m> may cause this error.
2434 =item %sseek() on unopened file
2436 (W) You tried to use the seek() or sysseek() function on a filehandle that
2437 was either never opened or has since been closed.
2439 =item select not implemented
2441 (F) This machine doesn't implement the select() system call.
2443 =item sem%s not implemented
2445 (F) You don't have System V semaphore IPC on your system.
2447 =item semi-panic: attempt to dup freed string
2449 (S) The internal newSVsv() routine was called to duplicate a scalar
2450 that had previously been marked as free.
2452 =item Semicolon seems to be missing
2454 (W) A nearby syntax error was probably caused by a missing semicolon,
2455 or possibly some other missing operator, such as a comma.
2457 =item Send on closed socket
2459 (W) The filehandle you're sending to got itself closed sometime before now.
2460 Check your logic flow.
2462 =item Sequence (? incomplete
2464 (F) A regular expression ended with an incomplete extension (?.
2467 =item Sequence (?#... not terminated
2469 (F) A regular expression comment must be terminated by a closing
2470 parenthesis. Embedded parentheses aren't allowed. See L<perlre>.
2472 =item Sequence (?%s...) not implemented
2474 (F) A proposed regular expression extension has the character reserved
2475 but has not yet been written. See L<perlre>.
2477 =item Sequence (?%s...) not recognized
2479 (F) You used a regular expression extension that doesn't make sense.
2484 Also known as "500 Server error".
2486 B<This is a CGI error, not a Perl error>.
2488 You need to make sure your script is executable, is accessible by the user
2489 CGI is running the script under (which is probably not the user account you
2490 tested it under), does not rely on any environment variables (like PATH)
2491 from the user it isn't running under, and isn't in a location where the CGI
2492 server can't find it, basically, more or less. Please see the following
2493 for more information:
2495 http://www.perl.com/CPAN/doc/FAQs/cgi/idiots-guide.html
2496 http://www.perl.com/CPAN/doc/FAQs/cgi/perl-cgi-faq.html
2497 ftp://rtfm.mit.edu/pub/usenet/news.answers/www/cgi-faq
2498 http://hoohoo.ncsa.uiuc.edu/cgi/interface.html
2499 http://www-genome.wi.mit.edu/WWW/faqs/www-security-faq.html
2501 You should also look at L<perlfaq9>.
2503 =item setegid() not implemented
2505 (F) You tried to assign to C<$)>, and your operating system doesn't support
2506 the setegid() system call (or equivalent), or at least Configure didn't
2509 =item seteuid() not implemented
2511 (F) You tried to assign to C<$E<gt>>, and your operating system doesn't support
2512 the seteuid() system call (or equivalent), or at least Configure didn't
2515 =item setrgid() not implemented
2517 (F) You tried to assign to C<$(>, and your operating system doesn't support
2518 the setrgid() system call (or equivalent), or at least Configure didn't
2521 =item setruid() not implemented
2523 (F) You tried to assign to C<$E<lt>>, and your operating system doesn't support
2524 the setruid() system call (or equivalent), or at least Configure didn't
2527 =item Setuid/gid script is writable by world
2529 (F) The setuid emulator won't run a script that is writable by the world,
2530 because the world might have written on it already.
2532 =item shm%s not implemented
2534 (F) You don't have System V shared memory IPC on your system.
2536 =item shutdown() on closed fd
2538 (W) You tried to do a shutdown on a closed socket. Seems a bit superfluous.
2540 =item SIG%s handler "%s" not defined
2542 (W) The signal handler named in %SIG doesn't, in fact, exist. Perhaps you
2543 put it into the wrong package?
2545 =item sort is now a reserved word
2547 (F) An ancient error message that almost nobody ever runs into anymore.
2548 But before sort was a keyword, people sometimes used it as a filehandle.
2550 =item Sort subroutine didn't return a numeric value
2552 (F) A sort comparison routine must return a number. You probably blew
2553 it by not using C<E<lt>=E<gt>> or C<cmp>, or by not using them correctly.
2554 See L<perlfunc/sort>.
2556 =item Sort subroutine didn't return single value
2558 (F) A sort comparison subroutine may not return a list value with more
2559 or less than one element. See L<perlfunc/sort>.
2563 (P) The split was looping infinitely. (Obviously, a split shouldn't iterate
2564 more times than there are characters of input, which is what happened.)
2565 See L<perlfunc/split>.
2567 =item Stat on unopened file E<lt>%sE<gt>
2569 (W) You tried to use the stat() function (or an equivalent file test)
2570 on a filehandle that was either never opened or has since been closed.
2572 =item Statement unlikely to be reached
2574 (W) You did an exec() with some statement after it other than a die().
2575 This is almost always an error, because exec() never returns unless
2576 there was a failure. You probably wanted to use system() instead,
2577 which does return. To suppress this warning, put the exec() in a block
2580 =item Strange *+?{} on zero-length expression
2582 (W) You applied a regular expression quantifier in a place where it
2583 makes no sense, such as on a zero-width assertion.
2584 Try putting the quantifier inside the assertion instead. For example,
2585 the way to match "abc" provided that it is followed by three
2586 repetitions of "xyz" is C</abc(?=(?:xyz){3})/>, not C</abc(?=xyz){3}/>.
2588 =item Stub found while resolving method `%s' overloading `%s' in package `%s'
2590 (P) Overloading resolution over @ISA tree may be broken by importation stubs.
2591 Stubs should never be implicitely created, but explicit calls to C<can>
2594 =item Subroutine %s redefined
2596 (W) You redefined a subroutine. To suppress this warning, say
2600 eval "sub name { ... }";
2603 =item Substitution loop
2605 (P) The substitution was looping infinitely. (Obviously, a
2606 substitution shouldn't iterate more times than there are characters of
2607 input, which is what happened.) See the discussion of substitution in
2608 L<perlop/"Quote and Quote-like Operators">.
2610 =item Substitution pattern not terminated
2612 (F) The lexer couldn't find the interior delimiter of a s/// or s{}{}
2613 construct. Remember that bracketing delimiters count nesting level.
2614 Missing the leading C<$> from variable C<$s> may cause this error.
2616 =item Substitution replacement not terminated
2618 (F) The lexer couldn't find the final delimiter of a s/// or s{}{}
2619 construct. Remember that bracketing delimiters count nesting level.
2620 Missing the leading C<$> from variable C<$s> may cause this error.
2622 =item substr outside of string
2624 (S),(W) You tried to reference a substr() that pointed outside of a
2625 string. That is, the absolute value of the offset was larger than the
2626 length of the string. See L<perlfunc/substr>. This warning is
2627 mandatory if substr is used in an lvalue context (as the left hand side
2628 of an assignment or as a subroutine argument for example).
2630 =item suidperl is no longer needed since %s
2632 (F) Your Perl was compiled with B<-D>SETUID_SCRIPTS_ARE_SECURE_NOW, but a
2633 version of the setuid emulator somehow got run anyway.
2635 =item switching effective %s is not implemented
2637 (F) While under the C<use filetest> pragma, we cannot switch the
2638 real and effective uids or gids.
2642 (F) Probably means you had a syntax error. Common reasons include:
2644 A keyword is misspelled.
2645 A semicolon is missing.
2647 An opening or closing parenthesis is missing.
2648 An opening or closing brace is missing.
2649 A closing quote is missing.
2651 Often there will be another error message associated with the syntax
2652 error giving more information. (Sometimes it helps to turn on B<-w>.)
2653 The error message itself often tells you where it was in the line when
2654 it decided to give up. Sometimes the actual error is several tokens
2655 before this, because Perl is good at understanding random input.
2656 Occasionally the line number may be misleading, and once in a blue moon
2657 the only way to figure out what's triggering the error is to call
2658 C<perl -c> repeatedly, chopping away half the program each time to see
2659 if the error went away. Sort of the cybernetic version of S<20 questions>.
2661 =item syntax error at line %d: `%s' unexpected
2663 (A) You've accidentally run your script through the Bourne shell
2664 instead of Perl. Check the #! line, or manually feed your script
2667 =item System V %s is not implemented on this machine
2669 (F) You tried to do something with a function beginning with "sem",
2670 "shm", or "msg" but that System V IPC is not implemented in your
2671 machine. In some machines the functionality can exist but be
2672 unconfigured. Consult your system support.
2674 =item Syswrite on closed filehandle
2676 (W) The filehandle you're writing to got itself closed sometime before now.
2677 Check your logic flow.
2679 =item Target of goto is too deeply nested
2681 (F) You tried to use C<goto> to reach a label that was too deeply
2682 nested for Perl to reach. Perl is doing you a favor by refusing.
2684 =item tell() on unopened file
2686 (W) You tried to use the tell() function on a filehandle that was either
2687 never opened or has since been closed.
2689 =item Test on unopened file E<lt>%sE<gt>
2691 (W) You tried to invoke a file test operator on a filehandle that isn't
2692 open. Check your logic. See also L<perlfunc/-X>.
2694 =item That use of $[ is unsupported
2696 (F) Assignment to C<$[> is now strictly circumscribed, and interpreted as
2697 a compiler directive. You may say only one of
2706 This is to prevent the problem of one module changing the array base
2707 out from under another module inadvertently. See L<perlvar/$[>.
2709 =item The %s function is unimplemented
2711 The function indicated isn't implemented on this architecture, according
2712 to the probings of Configure.
2714 =item The crypt() function is unimplemented due to excessive paranoia
2716 (F) Configure couldn't find the crypt() function on your machine,
2717 probably because your vendor didn't supply it, probably because they
2718 think the U.S. Government thinks it's a secret, or at least that they
2719 will continue to pretend that it is. And if you quote me on that, I
2722 =item The stat preceding C<-l _> wasn't an lstat
2724 (F) It makes no sense to test the current stat buffer for symbolic linkhood
2725 if the last stat that wrote to the stat buffer already went past
2726 the symlink to get to the real file. Use an actual filename instead.
2728 =item This Perl can't reset CRTL eviron elements (%s)
2730 =item This Perl can't set CRTL environ elements (%s=%s)
2732 (W) Warnings peculiar to VMS. You tried to change or delete an element
2733 of the CRTL's internal environ array, but your copy of Perl wasn't
2734 built with a CRTL that contained the setenv() function. You'll need to
2735 rebuild Perl with a CRTL that does, or redefine F<PERL_ENV_TABLES> (see
2736 L<perlvms>) so that the environ array isn't the target of the change to
2737 %ENV which produced the warning.
2739 =item times not implemented
2741 (F) Your version of the C library apparently doesn't do times(). I suspect
2742 you're not running on Unix.
2744 =item Too few args to syscall
2746 (F) There has to be at least one argument to syscall() to specify the
2747 system call to call, silly dilly.
2749 =item Too late for "B<-T>" option
2751 (X) The #! line (or local equivalent) in a Perl script contains the
2752 B<-T> option, but Perl was not invoked with B<-T> in its command line.
2753 This is an error because, by the time Perl discovers a B<-T> in a
2754 script, it's too late to properly taint everything from the environment.
2757 If the Perl script is being executed as a command using the #!
2758 mechanism (or its local equivalent), this error can usually be fixed
2759 by editing the #! line so that the B<-T> option is a part of Perl's
2760 first argument: e.g. change C<perl -n -T> to C<perl -T -n>.
2762 If the Perl script is being executed as C<perl scriptname>, then the
2763 B<-T> option must appear on the command line: C<perl -T scriptname>.
2765 =item Too late for "-%s" option
2767 (X) The #! line (or local equivalent) in a Perl script contains the
2768 B<-M> or B<-m> option. This is an error because B<-M> and B<-m> options
2769 are not intended for use inside scripts. Use the C<use> pragma instead.
2775 (A) You've accidentally run your script through B<csh> instead
2776 of Perl. Check the #! line, or manually feed your script into
2779 =item Too many args to syscall
2781 (F) Perl supports a maximum of only 14 args to syscall().
2783 =item Too many arguments for %s
2785 (F) The function requires fewer arguments than you specified.
2787 =item trailing \ in regexp
2789 (F) The regular expression ends with an unbackslashed backslash. Backslash
2792 =item Transliteration pattern not terminated
2794 (F) The lexer couldn't find the interior delimiter of a tr/// or tr[][]
2795 or y/// or y[][] construct. Missing the leading C<$> from variables
2796 C<$tr> or C<$y> may cause this error.
2798 =item Transliteration replacement not terminated
2800 (F) The lexer couldn't find the final delimiter of a tr/// or tr[][]
2803 =item truncate not implemented
2805 (F) Your machine doesn't implement a file truncation mechanism that
2806 Configure knows about.
2808 =item Type of arg %d to %s must be %s (not %s)
2810 (F) This function requires the argument in that position to be of a
2811 certain type. Arrays must be @NAME or C<@{EXPR}>. Hashes must be
2812 %NAME or C<%{EXPR}>. No implicit dereferencing is allowed--use the
2813 {EXPR} forms as an explicit dereference. See L<perlref>.
2815 =item umask: argument is missing initial 0
2817 (W) A umask of 222 is incorrect. It should be 0222, because octal
2818 literals always start with 0 in Perl, as in C.
2820 =item umask not implemented
2822 (F) Your machine doesn't implement the umask function and you tried
2823 to use it to restrict permissions for yourself (EXPR & 0700).
2825 =item Unable to create sub named "%s"
2827 (F) You attempted to create or access a subroutine with an illegal name.
2829 =item Unbalanced context: %d more PUSHes than POPs
2831 (W) The exit code detected an internal inconsistency in how many execution
2832 contexts were entered and left.
2834 =item Unbalanced saves: %d more saves than restores
2836 (W) The exit code detected an internal inconsistency in how many
2837 values were temporarily localized.
2839 =item Unbalanced scopes: %d more ENTERs than LEAVEs
2841 (W) The exit code detected an internal inconsistency in how many blocks
2842 were entered and left.
2844 =item Unbalanced tmps: %d more allocs than frees
2846 (W) The exit code detected an internal inconsistency in how many mortal
2847 scalars were allocated and freed.
2849 =item Undefined format "%s" called
2851 (F) The format indicated doesn't seem to exist. Perhaps it's really in
2852 another package? See L<perlform>.
2854 =item Undefined sort subroutine "%s" called
2856 (F) The sort comparison routine specified doesn't seem to exist. Perhaps
2857 it's in a different package? See L<perlfunc/sort>.
2859 =item Undefined subroutine &%s called
2861 (F) The subroutine indicated hasn't been defined, or if it was, it
2862 has since been undefined.
2864 =item Undefined subroutine called
2866 (F) The anonymous subroutine you're trying to call hasn't been defined,
2867 or if it was, it has since been undefined.
2869 =item Undefined subroutine in sort
2871 (F) The sort comparison routine specified is declared but doesn't seem to
2872 have been defined yet. See L<perlfunc/sort>.
2874 =item Undefined top format "%s" called
2876 (F) The format indicated doesn't seem to exist. Perhaps it's really in
2877 another package? See L<perlform>.
2879 =item Undefined value assigned to typeglob
2881 (W) An undefined value was assigned to a typeglob, a la C<*foo = undef>.
2882 This does nothing. It's possible that you really mean C<undef *foo>.
2884 =item unexec of %s into %s failed!
2886 (F) The unexec() routine failed for some reason. See your local FSF
2887 representative, who probably put it there in the first place.
2889 =item Unknown BYTEORDER
2891 (F) There are no byte-swapping functions for a machine with this byte order.
2893 =item Unknown open() mode '%s'
2895 (F) The second argument of 3-arguments open is not one from the list
2896 of C<L<lt>>, C<L<gt>>, C<E<gt>E<gt>>, C<+L<lt>>, C<+L<gt>>,
2897 C<+E<gt>E<gt>>, C<-|>, C<|-> of possible open() modes.
2899 =item Unknown process %x sent message to prime_env_iter: %s
2901 (P) An error peculiar to VMS. Perl was reading values for %ENV before
2902 iterating over it, and someone else stuck a message in the stream of
2903 data Perl expected. Someone's very confused, or perhaps trying to
2904 subvert Perl's population of %ENV for nefarious purposes.
2906 =item unmatched () in regexp
2908 (F) Unbackslashed parentheses must always be balanced in regular
2909 expressions. If you're a vi user, the % key is valuable for finding
2910 the matching parenthesis. See L<perlre>.
2912 =item Unmatched right %s bracket
2914 (F) The lexer counted more closing curly or square brackets than
2915 opening ones, so you're probably missing a matching opening bracket.
2916 As a general rule, you'll find the missing one (so to speak) near the
2917 place you were last editing.
2919 =item unmatched [] in regexp
2921 (F) The brackets around a character class must match. If you wish to
2922 include a closing bracket in a character class, backslash it or put it first.
2925 =item Unquoted string "%s" may clash with future reserved word
2927 (W) You used a bareword that might someday be claimed as a reserved word.
2928 It's best to put such a word in quotes, or capitalize it somehow, or insert
2929 an underbar into it. You might also declare it as a subroutine.
2931 =item Unrecognized character %s
2933 (F) The Perl parser has no idea what to do with the specified character
2934 in your Perl script (or eval). Perhaps you tried to run a compressed
2935 script, a binary program, or a directory as a Perl program.
2937 =item Unrecognized escape \\%c passed through
2939 (W) You used a backslash-character combination which is not recognized
2942 =item Unrecognized signal name "%s"
2944 (F) You specified a signal name to the kill() function that was not recognized.
2945 Say C<kill -l> in your shell to see the valid signal names on your system.
2947 =item Unrecognized switch: -%s (-h will show valid options)
2949 (F) You specified an illegal option to Perl. Don't do that.
2950 (If you think you didn't do that, check the #! line to see if it's
2951 supplying the bad switch on your behalf.)
2953 =item Unsuccessful %s on filename containing newline
2955 (W) A file operation was attempted on a filename, and that operation
2956 failed, PROBABLY because the filename contained a newline, PROBABLY
2957 because you forgot to chop() or chomp() it off. See L<perlfunc/chomp>.
2959 =item Unsupported directory function "%s" called
2961 (F) Your machine doesn't support opendir() and readdir().
2963 =item Unsupported function fork
2965 (F) Your version of executable does not support forking.
2967 Note that under some systems, like OS/2, there may be different flavors of
2968 Perl executables, some of which may support fork, some not. Try changing
2969 the name you call Perl by to C<perl_>, C<perl__>, and so on.
2971 =item Unsupported function %s
2973 (F) This machine doesn't implement the indicated function, apparently.
2974 At least, Configure doesn't think so.
2976 =item Unsupported socket function "%s" called
2978 (F) Your machine doesn't support the Berkeley socket mechanism, or at
2979 least that's what Configure thought.
2981 =item Unterminated E<lt>E<gt> operator
2983 (F) The lexer saw a left angle bracket in a place where it was expecting
2984 a term, so it's looking for the corresponding right angle bracket, and not
2985 finding it. Chances are you left some needed parentheses out earlier in
2986 the line, and you really meant a "less than".
2988 =item Use of $# is deprecated
2990 (D) This was an ill-advised attempt to emulate a poorly defined B<awk> feature.
2991 Use an explicit printf() or sprintf() instead.
2993 =item Use of $* is deprecated
2995 (D) This variable magically turned on multi-line pattern matching, both for
2996 you and for any luckless subroutine that you happen to call. You should
2997 use the new C<//m> and C<//s> modifiers now to do that without the dangerous
2998 action-at-a-distance effects of C<$*>.
3000 =item Use of %s in printf format not supported
3002 (F) You attempted to use a feature of printf that is accessible from
3003 only C. This usually means there's a better way to do it in Perl.
3005 =item Use of bare E<lt>E<lt> to mean E<lt>E<lt>"" is deprecated
3007 (D) You are now encouraged to use the explicitly quoted form if you
3008 wish to use an empty line as the terminator of the here-document.
3010 =item Use of implicit split to @_ is deprecated
3012 (D) It makes a lot of work for the compiler when you clobber a
3013 subroutine's argument list, so it's better if you assign the results of
3014 a split() explicitly to an array (or list).
3016 =item Use of inherited AUTOLOAD for non-method %s() is deprecated
3018 (D) As an (ahem) accidental feature, C<AUTOLOAD> subroutines are looked
3019 up as methods (using the C<@ISA> hierarchy) even when the subroutines to
3020 be autoloaded were called as plain functions (e.g. C<Foo::bar()>), not
3021 as methods (e.g. C<Foo-E<gt>bar()> or C<$obj-E<gt>bar()>).
3023 This bug will be rectified in Perl 5.005, which will use method lookup
3024 only for methods' C<AUTOLOAD>s. However, there is a significant base
3025 of existing code that may be using the old behavior. So, as an
3026 interim step, Perl 5.004 issues an optional warning when non-methods
3027 use inherited C<AUTOLOAD>s.
3029 The simple rule is: Inheritance will not work when autoloading
3030 non-methods. The simple fix for old code is: In any module that used to
3031 depend on inheriting C<AUTOLOAD> for non-methods from a base class named
3032 C<BaseClass>, execute C<*AUTOLOAD = \&BaseClass::AUTOLOAD> during startup.
3034 In code that currently says C<use AutoLoader; @ISA = qw(AutoLoader);> you
3035 should remove AutoLoader from @ISA and change C<use AutoLoader;> to
3036 C<use AutoLoader 'AUTOLOAD';>.
3038 =item Use of reserved word "%s" is deprecated
3040 (D) The indicated bareword is a reserved word. Future versions of perl
3041 may use it as a keyword, so you're better off either explicitly quoting
3042 the word in a manner appropriate for its context of use, or using a
3043 different name altogether. The warning can be suppressed for subroutine
3044 names by either adding a C<&> prefix, or using a package qualifier,
3045 e.g. C<&our()>, or C<Foo::our()>.
3047 =item Use of %s is deprecated
3049 (D) The construct indicated is no longer recommended for use, generally
3050 because there's a better way to do it, and also because the old way has
3053 =item Use of uninitialized value
3055 (W) An undefined value was used as if it were already defined. It was
3056 interpreted as a "" or a 0, but maybe it was a mistake. To suppress this
3057 warning assign a defined value to your variables.
3059 =item Useless use of "re" pragma
3061 (W) You did C<use re;> without any arguments. That isn't very useful.
3063 =item Useless use of %s in void context
3065 (W) You did something without a side effect in a context that does nothing
3066 with the return value, such as a statement that doesn't return a value
3067 from a block, or the left side of a scalar comma operator. Very often
3068 this points not to stupidity on your part, but a failure of Perl to parse
3069 your program the way you thought it would. For example, you'd get this
3070 if you mixed up your C precedence with Python precedence and said
3074 when you meant to say
3076 ($one, $two) = (1, 2);
3078 Another common error is to use ordinary parentheses to construct a list
3079 reference when you should be using square or curly brackets, for
3084 when you should have said
3088 The square brackets explicitly turn a list value into a scalar value,
3089 while parentheses do not. So when a parenthesized list is evaluated in
3090 a scalar context, the comma is treated like C's comma operator, which
3091 throws away the left argument, which is not what you want. See
3092 L<perlref> for more on this.
3094 =item untie attempted while %d inner references still exist
3096 (W) A copy of the object returned from C<tie> (or C<tied>) was still
3097 valid when C<untie> was called.
3099 =item Value of %s can be "0"; test with defined()
3101 (W) In a conditional expression, you used <HANDLE>, <*> (glob), C<each()>,
3102 or C<readdir()> as a boolean value. Each of these constructs can return a
3103 value of "0"; that would make the conditional expression false, which is
3104 probably not what you intended. When using these constructs in conditional
3105 expressions, test their values with the C<defined> operator.
3107 =item Value of CLI symbol "%s" too long
3109 (W) A warning peculiar to VMS. Perl tried to read the value of an %ENV
3110 element from a CLI symbol table, and found a resultant string longer
3111 than 1024 characters. The return value has been truncated to 1024
3114 =item Variable "%s" is not imported%s
3116 (F) While "use strict" in effect, you referred to a global variable
3117 that you apparently thought was imported from another module, because
3118 something else of the same name (usually a subroutine) is exported
3119 by that module. It usually means you put the wrong funny character
3120 on the front of your variable.
3122 =item Variable "%s" may be unavailable
3124 (W) An inner (nested) I<anonymous> subroutine is inside a I<named>
3125 subroutine, and outside that is another subroutine; and the anonymous
3126 (innermost) subroutine is referencing a lexical variable defined in
3127 the outermost subroutine. For example:
3129 sub outermost { my $a; sub middle { sub { $a } } }
3131 If the anonymous subroutine is called or referenced (directly or
3132 indirectly) from the outermost subroutine, it will share the variable
3133 as you would expect. But if the anonymous subroutine is called or
3134 referenced when the outermost subroutine is not active, it will see
3135 the value of the shared variable as it was before and during the
3136 *first* call to the outermost subroutine, which is probably not what
3139 In these circumstances, it is usually best to make the middle
3140 subroutine anonymous, using the C<sub {}> syntax. Perl has specific
3141 support for shared variables in nested anonymous subroutines; a named
3142 subroutine in between interferes with this feature.
3144 =item Variable "%s" will not stay shared
3146 (W) An inner (nested) I<named> subroutine is referencing a lexical
3147 variable defined in an outer subroutine.
3149 When the inner subroutine is called, it will probably see the value of
3150 the outer subroutine's variable as it was before and during the
3151 *first* call to the outer subroutine; in this case, after the first
3152 call to the outer subroutine is complete, the inner and outer
3153 subroutines will no longer share a common value for the variable. In
3154 other words, the variable will no longer be shared.
3156 Furthermore, if the outer subroutine is anonymous and references a
3157 lexical variable outside itself, then the outer and inner subroutines
3158 will I<never> share the given variable.
3160 This problem can usually be solved by making the inner subroutine
3161 anonymous, using the C<sub {}> syntax. When inner anonymous subs that
3162 reference variables in outer subroutines are called or referenced,
3163 they are automatically rebound to the current values of such
3166 =item Variable syntax
3168 (A) You've accidentally run your script through B<csh> instead
3169 of Perl. Check the #! line, or manually feed your script into
3172 =item perl: warning: Setting locale failed.
3174 (S) The whole warning message will look something like:
3176 perl: warning: Setting locale failed.
3177 perl: warning: Please check that your locale settings:
3180 are supported and installed on your system.
3181 perl: warning: Falling back to the standard locale ("C").
3183 Exactly what were the failed locale settings varies. In the above the
3184 settings were that the LC_ALL was "En_US" and the LANG had no value.
3185 This error means that Perl detected that you and/or your system
3186 administrator have set up the so-called variable system but Perl could
3187 not use those settings. This was not dead serious, fortunately: there
3188 is a "default locale" called "C" that Perl can and will use, the
3189 script will be run. Before you really fix the problem, however, you
3190 will get the same error message each time you run Perl. How to really
3191 fix the problem can be found in L<perllocale> section B<LOCALE PROBLEMS>.
3193 =item Warning: something's wrong
3195 (W) You passed warn() an empty string (the equivalent of C<warn "">) or
3196 you called it with no args and C<$_> was empty.
3198 =item Warning: unable to close filehandle %s properly
3200 (S) The implicit close() done by an open() got an error indication on the
3201 close(). This usually indicates your file system ran out of disk space.
3203 =item Warning: Use of "%s" without parentheses is ambiguous
3205 (S) You wrote a unary operator followed by something that looks like a
3206 binary operator that could also have been interpreted as a term or
3207 unary operator. For instance, if you know that the rand function
3208 has a default argument of 1.0, and you write
3212 you may THINK you wrote the same thing as
3216 but in actual fact, you got
3220 So put in parentheses to say what you really mean.
3222 =item Write on closed filehandle %s
3224 (W) The filehandle you're writing to got itself closed sometime before now.
3225 Check your logic flow.
3227 =item X outside of string
3229 (F) You had a pack template that specified a relative position before
3230 the beginning of the string being unpacked. See L<perlfunc/pack>.
3232 =item x outside of string
3234 (F) You had a pack template that specified a relative position after
3235 the end of the string being unpacked. See L<perlfunc/pack>.
3237 =item Xsub "%s" called in sort
3239 (F) The use of an external subroutine as a sort comparison is not yet supported.
3241 =item Xsub called in sort
3243 (F) The use of an external subroutine as a sort comparison is not yet supported.
3245 =item You can't use C<-l> on a filehandle
3247 (F) A filehandle represents an opened file, and when you opened the file it
3248 already went past any symlink you are presumably trying to look for.
3249 Use a filename instead.
3251 =item YOU HAVEN'T DISABLED SET-ID SCRIPTS IN THE KERNEL YET!
3253 (F) And you probably never will, because you probably don't have the
3254 sources to your kernel, and your vendor probably doesn't give a rip
3255 about what you want. Your best bet is to use the wrapsuid script in
3256 the eg directory to put a setuid C wrapper around your script.
3258 =item You need to quote "%s"
3260 (W) You assigned a bareword as a signal handler name. Unfortunately, you
3261 already have a subroutine of that name declared, which means that Perl 5
3262 will try to call the subroutine when the assignment is executed, which is
3263 probably not what you want. (If it IS what you want, put an & in front.)
3265 =item [gs]etsockopt() on closed fd
3267 (W) You tried to get or set a socket option on a closed socket.
3268 Did you forget to check the return value of your socket() call?
3269 See L<perlfunc/getsockopt>.
3271 =item \1 better written as $1
3273 (W) Outside of patterns, backreferences live on as variables. The use
3274 of backslashes is grandfathered on the right-hand side of a
3275 substitution, but stylistically it's better to use the variable form
3276 because other Perl programmers will expect it, and it works better
3277 if there are more than 9 backreferences.
3279 =item '|' and 'E<lt>' may not both be specified on command line
3281 (F) An error peculiar to VMS. Perl does its own command line redirection, and
3282 found that STDIN was a pipe, and that you also tried to redirect STDIN using
3283 'E<lt>'. Only one STDIN stream to a customer, please.
3285 =item '|' and 'E<gt>' may not both be specified on command line
3287 (F) An error peculiar to VMS. Perl does its own command line redirection, and
3288 thinks you tried to redirect stdout both to a file and into a pipe to another
3289 command. You need to choose one or the other, though nothing's stopping you
3290 from piping into a program or Perl script which 'splits' output into two
3293 open(OUT,">$ARGV[0]") or die "Can't write to $ARGV[0]: $!";
3300 =item Got an error from DosAllocMem
3302 (P) An error peculiar to OS/2. Most probably you're using an obsolete
3303 version of Perl, and this should not happen anyway.
3305 =item Malformed PERLLIB_PREFIX
3307 (F) An error peculiar to OS/2. PERLLIB_PREFIX should be of the form
3315 with nonempty prefix1 and prefix2. If C<prefix1> is indeed a prefix
3316 of a builtin library search path, prefix2 is substituted. The error
3317 may appear if components are not found, or are too long. See
3318 "PERLLIB_PREFIX" in F<README.os2>.
3320 =item PERL_SH_DIR too long
3322 (F) An error peculiar to OS/2. PERL_SH_DIR is the directory to find the
3323 C<sh>-shell in. See "PERL_SH_DIR" in F<README.os2>.
3325 =item Process terminated by SIG%s
3327 (W) This is a standard message issued by OS/2 applications, while *nix
3328 applications die in silence. It is considered a feature of the OS/2
3329 port. One can easily disable this by appropriate sighandlers, see
3330 L<perlipc/"Signals">. See also "Process terminated by SIGTERM/SIGINT"