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 scope
38 (S) A lexical variable has been redeclared in the same scope, effectively
39 eliminating all access to the previous instance. This is almost always
40 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 % may only be used in unpack
56 (F) You can't pack a string by supplying a checksum, because the
57 checksumming process loses information, and you can't go the other
58 way. See L<perlfunc/unpack>.
60 =item %s (...) interpreted as function
62 (W) You've run afoul of the rule that says that any list operator followed
63 by parentheses turns into a function, with all the list operators arguments
64 found inside the parentheses. See L<perlop/Terms and List Operators (Leftward)>.
66 =item %s argument is not a HASH element
68 (F) The argument to exists() must be a hash element, such as
73 =item %s argument is not a HASH element or slice
75 (F) The argument to delete() must be either a hash element, such as
80 or a hash slice, such as
82 @foo{$bar, $baz, $xyzzy}
83 @{$ref->[12]}{"susie", "queue"}
85 =item %s did not return a true value
87 (F) A required (or used) file must return a true value to indicate that
88 it compiled correctly and ran its initialization code correctly. It's
89 traditional to end such a file with a "1;", though any true value would
90 do. See L<perlfunc/require>.
92 =item %s found where operator expected
94 (S) The Perl lexer knows whether to expect a term or an operator. If it
95 sees what it knows to be a term when it was expecting to see an operator,
96 it gives you this warning. Usually it indicates that an operator or
97 delimiter was omitted, such as a semicolon.
99 =item %s had compilation errors
101 (F) The final summary message when a C<perl -c> fails.
103 =item %s has too many errors
105 (F) The parser has given up trying to parse the program after 10 errors.
106 Further error messages would likely be uninformative.
108 =item %s matches null string many times
110 (W) The pattern you've specified would be an infinite loop if the
111 regular expression engine didn't specifically check for that. See L<perlre>.
113 =item %s never introduced
115 (S) The symbol in question was declared but somehow went out of scope
116 before it could possibly have been used.
120 (F) The final summary message when a C<perl -c> succeeds.
122 =item %s: Command not found
124 (A) You've accidentally run your script through B<csh> instead
125 of Perl. Check the #! line, or manually feed your script into
128 =item %s: Expression syntax
130 (A) You've accidentally run your script through B<csh> instead
131 of Perl. Check the #! line, or manually feed your script into
134 =item %s: Undefined variable
136 (A) You've accidentally run your script through B<csh> instead
137 of Perl. Check the #! line, or manually feed your script into
142 (A) You've accidentally run your script through the Bourne shell
143 instead of Perl. Check the #! line, or manually feed your script
146 =item B<-P> not allowed for setuid/setgid script
148 (F) The script would have to be opened by the C preprocessor by name,
149 which provides a race condition that breaks security.
151 =item C<-T> and C<-B> not implemented on filehandles
153 (F) Perl can't peek at the stdio buffer of filehandles when it doesn't
154 know about your kind of stdio. You'll have to use a filename instead.
156 =item C<-p> destination: %s
158 (F) An error occurred during the implicit output invoked by the C<-p>
159 command-line switch. (This output goes to STDOUT unless you've
160 redirected it with select().)
162 =item 500 Server error
166 =item ?+* follows nothing in regexp
168 (F) You started a regular expression with a quantifier. Backslash it
169 if you meant it literally. See L<perlre>.
171 =item @ outside of string
173 (F) You had a pack template that specified an absolute position outside
174 the string being unpacked. See L<perlfunc/pack>.
176 =item accept() on closed fd
178 (W) You tried to do an accept on a closed socket. Did you forget to check
179 the return value of your socket() call? See L<perlfunc/accept>.
181 =item Allocation too large: %lx
183 (X) You can't allocate more than 64K on an MS-DOS machine.
185 =item Allocation too large
187 (F) You can't allocate more than 2^31+"small amount" bytes.
189 =item Applying %s to %s will act on scalar(%s)
191 (W) The pattern match (//), substitution (s///), and translation (tr///)
192 operators work on scalar values. If you apply one of them to an array
193 or a hash, it will convert the array or hash to a scalar value -- the
194 length of an array, or the population info of a hash -- and then work on
195 that scalar value. This is probably not what you meant to do. See
196 L<perlfunc/grep> and L<perlfunc/map> for alternatives.
198 =item Arg too short for msgsnd
200 (F) msgsnd() requires a string at least as long as sizeof(long).
202 =item Ambiguous use of %s resolved as %s
204 (W)(S) You said something that may not be interpreted the way
205 you thought. Normally it's pretty easy to disambiguate it by supplying
206 a missing quote, operator, parenthesis pair or declaration.
208 =item Args must match #! line
210 (F) The setuid emulator requires that the arguments Perl was invoked
211 with match the arguments specified on the #! line. Since some systems
212 impose a one-argument limit on the #! line, try combining switches;
213 for example, turn C<-w -U> into C<-wU>.
215 =item Argument "%s" isn't numeric%s
217 (W) The indicated string was fed as an argument to an operator that
218 expected a numeric value instead. If you're fortunate the message
219 will identify which operator was so unfortunate.
221 =item Array @%s missing the @ in argument %d of %s()
223 (D) Really old Perl let you omit the @ on array names in some spots. This
224 is now heavily deprecated.
226 =item assertion botched: %s
228 (P) The malloc package that comes with Perl had an internal failure.
230 =item Assertion failed: file "%s"
232 (P) A general assertion failed. The file in question must be examined.
234 =item Assignment to both a list and a scalar
236 (F) If you assign to a conditional operator, the 2nd and 3rd arguments
237 must either both be scalars or both be lists. Otherwise Perl won't
238 know which context to supply to the right side.
240 =item Attempt to free non-arena SV: 0x%lx
242 (P) All SV objects are supposed to be allocated from arenas that will
243 be garbage collected on exit. An SV was discovered to be outside any
246 =item Attempt to free nonexistent shared string
248 (P) Perl maintains a reference counted internal table of strings to
249 optimize the storage and access of hash keys and other strings. This
250 indicates someone tried to decrement the reference count of a string
251 that can no longer be found in the table.
253 =item Attempt to free temp prematurely
255 (W) Mortalized values are supposed to be freed by the free_tmps()
256 routine. This indicates that something else is freeing the SV before
257 the free_tmps() routine gets a chance, which means that the free_tmps()
258 routine will be freeing an unreferenced scalar when it does try to free
261 =item Attempt to free unreferenced glob pointers
263 (P) The reference counts got screwed up on symbol aliases.
265 =item Attempt to free unreferenced scalar
267 (W) Perl went to decrement the reference count of a scalar to see if it
268 would go to 0, and discovered that it had already gone to 0 earlier,
269 and should have been freed, and in fact, probably was freed. This
270 could indicate that SvREFCNT_dec() was called too many times, or that
271 SvREFCNT_inc() was called too few times, or that the SV was mortalized
272 when it shouldn't have been, or that memory has been corrupted.
274 =item Attempt to use reference as lvalue in substr
276 (W) You supplied a reference as the first argument to substr() used
277 as an lvalue, which is pretty strange. Perhaps you forgot to
278 dereference it first. See L<perlfunc/substr>.
280 =item Bad arg length for %s, is %d, should be %d
282 (F) You passed a buffer of the wrong size to one of msgctl(), semctl() or
283 shmctl(). In C parlance, the correct sizes are, respectively,
284 S<sizeof(struct msqid_ds *)>, S<sizeof(struct semid_ds *)>, and
285 S<sizeof(struct shmid_ds *)>.
287 =item Bad filehandle: %s
289 (F) A symbol was passed to something wanting a filehandle, but the symbol
290 has no filehandle associated with it. Perhaps you didn't do an open(), or
291 did it in another package.
293 =item Bad free() ignored
295 (S) An internal routine called free() on something that had never been
296 malloc()ed in the first place. Mandatory, but can be disabled by
297 setting environment variable C<PERL_BADFREE> to 1.
299 This message can be quite often seen with DB_File on systems with
300 "hard" dynamic linking, like C<AIX> and C<OS/2>. It is a bug of
301 C<Berkeley DB> which is left unnoticed if C<DB> uses I<forgiving>
306 (P) One of the internal hash routines was passed a null HV pointer.
308 =item Bad name after %s::
310 (F) You started to name a symbol by using a package prefix, and then didn't
311 finish the symbol. In particular, you can't interpolate outside of quotes,
320 $sym = "mypack::$var";
322 =item Bad symbol for array
324 (P) An internal request asked to add an array entry to something that
325 wasn't a symbol table entry.
327 =item Bad symbol for filehandle
329 (P) An internal request asked to add a filehandle entry to something that
330 wasn't a symbol table entry.
332 =item Bad symbol for hash
334 (P) An internal request asked to add a hash entry to something that
335 wasn't a symbol table entry.
337 =item Badly placed ()'s
339 (A) You've accidentally run your script through B<csh> instead
340 of Perl. Check the #! line, or manually feed your script into
343 =item Bareword "%s" not allowed while "strict subs" in use
345 (F) With "strict subs" in use, a bareword is only allowed as a
346 subroutine identifier, in curly braces or to the left of the "=>" symbol.
347 Perhaps you need to predeclare a subroutine?
349 =item BEGIN failed--compilation aborted
351 (F) An untrapped exception was raised while executing a BEGIN subroutine.
352 Compilation stops immediately and the interpreter is exited.
354 =item BEGIN not safe after errors--compilation aborted
356 (F) Perl found a C<BEGIN {}> subroutine (or a C<use> directive, which
357 implies a C<BEGIN {}>) after one or more compilation errors had
358 already occurred. Since the intended environment for the C<BEGIN {}>
359 could not be guaranteed (due to the errors), and since subsequent code
360 likely depends on its correct operation, Perl just gave up.
362 =item bind() on closed fd
364 (W) You tried to do a bind on a closed socket. Did you forget to check
365 the return value of your socket() call? See L<perlfunc/bind>.
367 =item Bizarre copy of %s in %s
369 (P) Perl detected an attempt to copy an internal value that is not copiable.
371 =item Callback called exit
373 (F) A subroutine invoked from an external package via perl_call_sv()
374 exited by calling exit.
376 =item Can't "goto" outside a block
378 (F) A "goto" statement was executed to jump out of what might look
379 like a block, except that it isn't a proper block. This usually
380 occurs if you tried to jump out of a sort() block or subroutine, which
381 is a no-no. See L<perlfunc/goto>.
383 =item Can't "last" outside a block
385 (F) A "last" statement was executed to break out of the current block,
386 except that there's this itty bitty problem called there isn't a
387 current block. Note that an "if" or "else" block doesn't count as a
388 "loopish" block, as doesn't a block given to sort(). You can usually double
389 the curlies to get the same effect though, because the inner curlies
390 will be considered a block that loops once. See L<perlfunc/last>.
392 =item Can't "next" outside a block
394 (F) A "next" statement was executed to reiterate the current block, but
395 there isn't a current block. Note that an "if" or "else" block doesn't
396 count as a "loopish" block, as doesn't a block given to sort(). You can
397 usually double the curlies to get the same effect though, because the inner
398 curlies will be considered a block that loops once. See L<perlfunc/next>.
400 =item Can't "redo" outside a block
402 (F) A "redo" statement was executed to restart the current block, but
403 there isn't a current block. Note that an "if" or "else" block doesn't
404 count as a "loopish" block, as doesn't a block given to sort(). You can
405 usually double the curlies to get the same effect though, because the inner
406 curlies will be considered a block that loops once. See L<perlfunc/redo>.
408 =item Can't bless non-reference value
410 (F) Only hard references may be blessed. This is how Perl "enforces"
411 encapsulation of objects. See L<perlobj>.
413 =item Can't break at that line
415 (S) A warning intended to only be printed while running within the debugger, indicating
416 the line number specified wasn't the location of a statement that could
419 =item Can't call method "%s" in empty package "%s"
421 (F) You called a method correctly, and it correctly indicated a package
422 functioning as a class, but that package doesn't have ANYTHING defined
423 in it, let alone methods. See L<perlobj>.
425 =item Can't call method "%s" on unblessed reference
427 (F) A method call must know in what package it's supposed to run. It
428 ordinarily finds this out from the object reference you supply, but
429 you didn't supply an object reference in this case. A reference isn't
430 an object reference until it has been blessed. See L<perlobj>.
432 =item Can't call method "%s" without a package or object reference
434 (F) You used the syntax of a method call, but the slot filled by the
435 object reference or package name contains an expression that returns
436 neither an object reference nor a package name. (Perhaps it's null?)
437 Something like this will reproduce the error:
440 process $BADREF 1,2,3;
441 $BADREF->process(1,2,3);
443 =item Can't chdir to %s
445 (F) You called C<perl -x/foo/bar>, but C</foo/bar> is not a directory
446 that you can chdir to, possibly because it doesn't exist.
448 =item Can't coerce %s to integer in %s
450 (F) Certain types of SVs, in particular real symbol table entries
451 (typeglobs), can't be forced to stop being what they are. So you can't
461 but then $foo no longer contains a glob.
463 =item Can't coerce %s to number in %s
465 (F) Certain types of SVs, in particular real symbol table entries
466 (typeglobs), can't be forced to stop being what they are.
468 =item Can't coerce %s to string in %s
470 (F) Certain types of SVs, in particular real symbol table entries
471 (typeglobs), can't be forced to stop being what they are.
473 =item Can't create pipe mailbox
475 (P) An error peculiar to VMS. The process is suffering from exhausted quotas
476 or other plumbing problems.
478 =item Can't declare %s in my
480 (F) Only scalar, array, and hash variables may be declared as lexical variables.
481 They must have ordinary identifiers as names.
483 =item Can't do inplace edit on %s: %s
485 (S) The creation of the new file failed for the indicated reason.
487 =item Can't do inplace edit without backup
489 (F) You're on a system such as MS-DOS that gets confused if you try reading
490 from a deleted (but still opened) file. You have to say C<-i.bak>, or some
493 =item Can't do inplace edit: %s E<gt> 14 characters
495 (S) There isn't enough room in the filename to make a backup name for the file.
497 =item Can't do inplace edit: %s is not a regular file
499 (S) You tried to use the B<-i> switch on a special file, such as a file in
500 /dev, or a FIFO. The file was ignored.
502 =item Can't do setegid!
504 (P) The setegid() call failed for some reason in the setuid emulator
507 =item Can't do seteuid!
509 (P) The setuid emulator of suidperl failed for some reason.
511 =item Can't do setuid
513 (F) This typically means that ordinary perl tried to exec suidperl to
514 do setuid emulation, but couldn't exec it. It looks for a name of the
515 form sperl5.000 in the same directory that the perl executable resides
516 under the name perl5.000, typically /usr/local/bin on Unix machines.
517 If the file is there, check the execute permissions. If it isn't, ask
518 your sysadmin why he and/or she removed it.
520 =item Can't do waitpid with flags
522 (F) This machine doesn't have either waitpid() or wait4(), so only waitpid()
523 without flags is emulated.
525 =item Can't do {n,m} with n E<gt> m
527 (F) Minima must be less than or equal to maxima. If you really want
528 your regexp to match something 0 times, just put {0}. See L<perlre>.
530 =item Can't emulate -%s on #! line
532 (F) The #! line specifies a switch that doesn't make sense at this point.
533 For example, it'd be kind of silly to put a B<-x> on the #! line.
535 =item Can't exec "%s": %s
537 (W) An system(), exec(), or piped open call could not execute the named
538 program for the indicated reason. Typical reasons include: the permissions
539 were wrong on the file, the file wasn't found in C<$ENV{PATH}>, the
540 executable in question was compiled for another architecture, or the
541 #! line in a script points to an interpreter that can't be run for
542 similar reasons. (Or maybe your system doesn't support #! at all.)
546 (F) Perl was trying to execute the indicated program for you because that's
547 what the #! line said. If that's not what you wanted, you may need to
548 mention "perl" on the #! line somewhere.
550 =item Can't execute %s
552 (F) You used the B<-S> switch, but the copies of the script to execute found
553 in the PATH did not have correct permissions.
555 =item Can't find %s on PATH, '.' not in PATH
557 (F) You used the B<-S> switch, but the script to execute could not be found
558 in the PATH, or at least not with the correct permissions. The script
559 exists in the current directory, but PATH prohibits running it.
561 =item Can't find %s on PATH
563 (F) You used the B<-S> switch, but the script to execute could not be found
566 =item Can't find label %s
568 (F) You said to goto a label that isn't mentioned anywhere that it's possible
569 for us to go to. See L<perlfunc/goto>.
571 =item Can't find string terminator %s anywhere before EOF
573 (F) Perl strings can stretch over multiple lines. This message means that
574 the closing delimiter was omitted. Because bracketed quotes count nesting
575 levels, the following is missing its final parenthesis:
577 print q(The character '(' starts a side comment.)
581 (F) A fatal error occurred while trying to fork while opening a pipeline.
583 =item Can't get filespec - stale stat buffer?
585 (S) A warning peculiar to VMS. This arises because of the difference between
586 access checks under VMS and under the Unix model Perl assumes. Under VMS,
587 access checks are done by filename, rather than by bits in the stat buffer, so
588 that ACLs and other protections can be taken into account. Unfortunately, Perl
589 assumes that the stat buffer contains all the necessary information, and passes
590 it, instead of the filespec, to the access checking routine. It will try to
591 retrieve the filespec using the device name and FID present in the stat buffer,
592 but this works only if you haven't made a subsequent call to the CRTL stat()
593 routine, because the device name is overwritten with each call. If this warning
594 appears, the name lookup failed, and the access checking routine gave up and
595 returned FALSE, just to be conservative. (Note: The access checking routine
596 knows about the Perl C<stat> operator and file tests, so you shouldn't ever
597 see this warning in response to a Perl command; it arises only if some internal
598 code takes stat buffers lightly.)
600 =item Can't get pipe mailbox device name
602 (P) An error peculiar to VMS. After creating a mailbox to act as a pipe, Perl
603 can't retrieve its name for later use.
605 =item Can't get SYSGEN parameter value for MAXBUF
607 (P) An error peculiar to VMS. Perl asked $GETSYI how big you want your
608 mailbox buffers to be, and didn't get an answer.
610 =item Can't goto subroutine outside a subroutine
612 (F) The deeply magical "goto subroutine" call can only replace one subroutine
613 call for another. It can't manufacture one out of whole cloth. In general
614 you should be calling it out of only an AUTOLOAD routine anyway. See
617 =item Can't localize through a reference
619 (F) You said something like C<local $$ref>, which Perl can't currently
620 handle, because when it goes to restore the old value of whatever $ref
621 pointed to after the scope of the local() is finished, it can't be
622 sure that $ref will still be a reference.
624 =item Can't localize lexical variable %s
626 (F) You used local on a variable name that was previously declared as a
627 lexical variable using "my". This is not allowed. If you want to
628 localize a package variable of the same name, qualify it with the
631 =item Can't locate auto/%s.al in @INC
633 (F) A function (or method) was called in a package which allows autoload,
634 but there is no function to autoload. Most probable causes are a misprint
635 in a function/method name or a failure to C<AutoSplit> the file, say, by
636 doing C<make install>.
638 =item Can't locate %s in @INC
640 (F) You said to do (or require, or use) a file that couldn't be found
641 in any of the libraries mentioned in @INC. Perhaps you need to set the
642 PERL5LIB or PERL5OPT environment variable to say where the extra library
643 is, or maybe the script needs to add the library name to @INC. Or maybe
644 you just misspelled the name of the file. See L<perlfunc/require>.
646 =item Can't locate object method "%s" via package "%s"
648 (F) You called a method correctly, and it correctly indicated a package
649 functioning as a class, but that package doesn't define that particular
650 method, nor does any of its base classes. See L<perlobj>.
652 =item Can't locate package %s for @%s::ISA
654 (W) The @ISA array contained the name of another package that doesn't seem
657 =item Can't make list assignment to \%ENV on this system
659 (F) List assignment to %ENV is not supported on some systems, notably VMS.
663 (F) The mktemp() routine failed for some reason while trying to process
664 a B<-e> switch. Maybe your /tmp partition is full, or clobbered.
666 =item Can't modify %s in %s
668 (F) You aren't allowed to assign to the item indicated, or otherwise try to
669 change it, such as with an auto-increment.
671 =item Can't modify nonexistent substring
673 (P) The internal routine that does assignment to a substr() was handed
676 =item Can't msgrcv to read-only var
678 (F) The target of a msgrcv must be modifiable to be used as a receive
681 =item Can't open %s: %s
683 (S) The implicit opening of a file through use of the C<E<lt>E<gt>>
684 filehandle, either implicitly under the C<-n> or C<-p> command-line
685 switches, or explicitly, failed for the indicated reason. Usually this
686 is because you don't have read permission for a file which you named
689 =item Can't open bidirectional pipe
691 (W) You tried to say C<open(CMD, "|cmd|")>, which is not supported. You can
692 try any of several modules in the Perl library to do this, such as
693 IPC::Open2. Alternately, direct the pipe's output to a file using "E<gt>",
694 and then read it in under a different file handle.
696 =item Can't open error file %s as stderr
698 (F) An error peculiar to VMS. Perl does its own command line redirection, and
699 couldn't open the file specified after '2E<gt>' or '2E<gt>E<gt>' on the
700 command line for writing.
702 =item Can't open input file %s as stdin
704 (F) An error peculiar to VMS. Perl does its own command line redirection, and
705 couldn't open the file specified after 'E<lt>' on the command line for reading.
707 =item Can't open output file %s as stdout
709 (F) An error peculiar to VMS. Perl does its own command line redirection, and
710 couldn't open the file specified after 'E<gt>' or 'E<gt>E<gt>' on the command
713 =item Can't open output pipe (name: %s)
715 (P) An error peculiar to VMS. Perl does its own command line redirection, and
716 couldn't open the pipe into which to send data destined for stdout.
718 =item Can't open perl script "%s": %s
720 (F) The script you specified can't be opened for the indicated reason.
722 =item Can't redefine active sort subroutine %s
724 (F) Perl optimizes the internal handling of sort subroutines and keeps
725 pointers into them. You tried to redefine one such sort subroutine when it
726 was currently active, which is not allowed. If you really want to do
727 this, you should write C<sort { &func } @x> instead of C<sort func @x>.
729 =item Can't rename %s to %s: %s, skipping file
731 (S) The rename done by the B<-i> switch failed for some reason, probably because
732 you don't have write permission to the directory.
734 =item Can't reopen input pipe (name: %s) in binary mode
736 (P) An error peculiar to VMS. Perl thought stdin was a pipe, and tried to
737 reopen it to accept binary data. Alas, it failed.
739 =item Can't reswap uid and euid
741 (P) The setreuid() call failed for some reason in the setuid emulator
744 =item Can't return outside a subroutine
746 (F) The return statement was executed in mainline code, that is, where
747 there was no subroutine call to return out of. See L<perlsub>.
749 =item Can't stat script "%s"
751 (P) For some reason you can't fstat() the script even though you have
752 it open already. Bizarre.
754 =item Can't swap uid and euid
756 (P) The setreuid() call failed for some reason in the setuid emulator
759 =item Can't take log of %g
761 (F) Logarithms are defined on only positive real numbers.
763 =item Can't take sqrt of %g
765 (F) For ordinary real numbers, you can't take the square root of a
766 negative number. There's a Complex package available for Perl, though,
767 if you really want to do that.
769 =item Can't undef active subroutine
771 (F) You can't undefine a routine that's currently running. You can,
772 however, redefine it while it's running, and you can even undef the
773 redefined subroutine while the old routine is running. Go figure.
777 (F) You tried to unshift an "unreal" array that can't be unshifted, such
778 as the main Perl stack.
780 =item Can't upgrade that kind of scalar
782 (P) The internal sv_upgrade routine adds "members" to an SV, making
783 it into a more specialized kind of SV. The top several SV types are
784 so specialized, however, that they cannot be interconverted. This
785 message indicates that such a conversion was attempted.
787 =item Can't upgrade to undef
789 (P) The undefined SV is the bottom of the totem pole, in the scheme
790 of upgradability. Upgrading to undef indicates an error in the
791 code calling sv_upgrade.
793 =item Can't use "my %s" in sort comparison
795 (F) The global variables $a and $b are reserved for sort comparisons.
796 You mentioned $a or $b in the same line as the E<lt>=E<gt> or cmp operator,
797 and the variable had earlier been declared as a lexical variable.
798 Either qualify the sort variable with the package name, or rename the
801 =item Can't use %s for loop variable
803 (F) Only a simple scalar variable may be used as a loop variable on a foreach.
805 =item Can't use %s ref as %s ref
807 (F) You've mixed up your reference types. You have to dereference a
808 reference of the type needed. You can use the ref() function to
809 test the type of the reference, if need be.
811 =item Can't use \1 to mean $1 in expression
813 (W) In an ordinary expression, backslash is a unary operator that creates
814 a reference to its argument. The use of backslash to indicate a backreference
815 to a matched substring is valid only as part of a regular expression pattern.
816 Trying to do this in ordinary Perl code produces a value that prints
817 out looking like SCALAR(0xdecaf). Use the $1 form instead.
819 =item Can't use bareword ("%s") as %s ref while \"strict refs\" in use
821 (F) Only hard references are allowed by "strict refs". Symbolic references
822 are disallowed. See L<perlref>.
824 =item Can't use string ("%s") as %s ref while "strict refs" in use
826 (F) Only hard references are allowed by "strict refs". Symbolic references
827 are disallowed. See L<perlref>.
829 =item Can't use an undefined value as %s reference
831 (F) A value used as either a hard reference or a symbolic reference must
832 be a defined value. This helps to delurk some insidious errors.
834 =item Can't use global %s in "my"
836 (F) You tried to declare a magical variable as a lexical variable. This is
837 not allowed, because the magic can be tied to only one location (namely
838 the global variable) and it would be incredibly confusing to have
839 variables in your program that looked like magical variables but
842 =item Can't use subscript on %s
844 (F) The compiler tried to interpret a bracketed expression as a
845 subscript. But to the left of the brackets was an expression that
846 didn't look like an array reference, or anything else subscriptable.
848 =item Can't write to temp file for B<-e>: %s
850 (F) The write routine failed for some reason while trying to process
851 a B<-e> switch. Maybe your /tmp partition is full, or clobbered.
853 =item Can't x= to read-only value
855 (F) You tried to repeat a constant value (often the undefined value) with
856 an assignment operator, which implies modifying the value itself.
857 Perhaps you need to copy the value to a temporary, and repeat that.
859 =item Cannot open temporary file
861 (F) The create routine failed for some reason while trying to process
862 a B<-e> switch. Maybe your /tmp partition is full, or clobbered.
864 =item Cannot resolve method `%s' overloading `%s' in package `%s'
866 (F|P) Error resolving overloading specified by a method name (as
867 opposed to a subroutine reference): no such method callable via the
868 package. If method name is C<???>, this is an internal error.
870 =item chmod: mode argument is missing initial 0
872 (W) A novice will sometimes say
876 not realizing that 777 will be interpreted as a decimal number, equivalent
877 to 01411. Octal constants are introduced with a leading 0 in Perl, as in C.
879 =item Close on unopened file E<lt>%sE<gt>
881 (W) You tried to close a filehandle that was never opened.
883 =item Compilation failed in require
885 (F) Perl could not compile a file specified in a C<require> statement.
886 Perl uses this generic message when none of the errors that it encountered
887 were severe enough to halt compilation immediately.
889 =item connect() on closed fd
891 (W) You tried to do a connect on a closed socket. Did you forget to check
892 the return value of your socket() call? See L<perlfunc/connect>.
894 =item Constant subroutine %s redefined
896 (S) You redefined a subroutine which had previously been eligible for
897 inlining. See L<perlsub/"Constant Functions"> for commentary and
900 =item Constant subroutine %s undefined
902 (S) You undefined a subroutine which had previously been eligible for
903 inlining. See L<perlsub/"Constant Functions"> for commentary and
906 =item Copy method did not return a reference
908 (F) The method which overloads "=" is buggy. See L<overload/Copy Constructor>.
910 =item Corrupt malloc ptr 0x%lx at 0x%lx
912 (P) The malloc package that comes with Perl had an internal failure.
914 =item corrupted regexp pointers
916 (P) The regular expression engine got confused by what the regular
917 expression compiler gave it.
919 =item corrupted regexp program
921 (P) The regular expression engine got passed a regexp program without
922 a valid magic number.
924 =item Deep recursion on subroutine "%s"
926 (W) This subroutine has called itself (directly or indirectly) 100
927 times more than it has returned. This probably indicates an infinite
928 recursion, unless you're writing strange benchmark programs, in which
929 case it indicates something else.
931 =item Delimiter for here document is too long
933 (F) In a here document construct like C<E<lt>E<lt>FOO>, the label
934 C<FOO> is too long for Perl to handle. You have to be seriously
935 twisted to write code that triggers this error.
937 =item Did you mean &%s instead?
939 (W) You probably referred to an imported subroutine &FOO as $FOO or some such.
941 =item Did you mean $ or @ instead of %?
943 (W) You probably said %hash{$key} when you meant $hash{$key} or @hash{@keys}.
944 On the other hand, maybe you just meant %hash and got carried away.
948 (F) You passed die() an empty string (the equivalent of C<die "">) or
949 you called it with no args and both C<$@> and C<$_> were empty.
951 =item Do you need to predeclare %s?
953 (S) This is an educated guess made in conjunction with the message "%s
954 found where operator expected". It often means a subroutine or module
955 name is being referenced that hasn't been declared yet. This may be
956 because of ordering problems in your file, or because of a missing
957 "sub", "package", "require", or "use" statement. If you're
958 referencing something that isn't defined yet, you don't actually have
959 to define the subroutine or package before the current location. You
960 can use an empty "sub foo;" or "package FOO;" to enter a "forward"
963 =item Don't know how to handle magic of type '%s'
965 (P) The internal handling of magical variables has been cursed.
967 =item do_study: out of memory
969 (P) This should have been caught by safemalloc() instead.
971 =item Duplicate free() ignored
973 (S) An internal routine called free() on something that had already
976 =item elseif should be elsif
978 (S) There is no keyword "elseif" in Perl because Larry thinks it's
979 ugly. Your code will be interpreted as an attempt to call a method
980 named "elseif" for the class returned by the following block. This is
981 unlikely to be what you want.
983 =item END failed--cleanup aborted
985 (F) An untrapped exception was raised while executing an END subroutine.
986 The interpreter is immediately exited.
988 =item Error converting file specification %s
990 (F) An error peculiar to VMS. Because Perl may have to deal with file
991 specifications in either VMS or Unix syntax, it converts them to a
992 single form when it must operate on them directly. Either you've
993 passed an invalid file specification to Perl, or you've found a
994 case the conversion routines don't handle. Drat.
996 =item Excessively long <> operator
998 (F) The contents of a <> operator may not exceed the maximum size of a
999 Perl identifier. If you're just trying to glob a long list of
1000 filenames, try using the glob() operator, or put the filenames into a
1001 variable and glob that.
1003 =item Execution of %s aborted due to compilation errors
1005 (F) The final summary message when a Perl compilation fails.
1007 =item Exiting eval via %s
1009 (W) You are exiting an eval by unconventional means, such as
1010 a goto, or a loop control statement.
1012 =item Exiting pseudo-block via %s
1014 (W) You are exiting a rather special block construct (like a sort block or
1015 subroutine) by unconventional means, such as a goto, or a loop control
1016 statement. See L<perlfunc/sort>.
1018 =item Exiting subroutine via %s
1020 (W) You are exiting a subroutine by unconventional means, such as
1021 a goto, or a loop control statement.
1023 =item Exiting substitution via %s
1025 (W) You are exiting a substitution by unconventional means, such as
1026 a return, a goto, or a loop control statement.
1028 =item Fatal VMS error at %s, line %d
1030 (P) An error peculiar to VMS. Something untoward happened in a VMS system
1031 service or RTL routine; Perl's exit status should provide more details. The
1032 filename in "at %s" and the line number in "line %d" tell you which section of
1033 the Perl source code is distressed.
1035 =item fcntl is not implemented
1037 (F) Your machine apparently doesn't implement fcntl(). What is this, a
1038 PDP-11 or something?
1040 =item Filehandle %s never opened
1042 (W) An I/O operation was attempted on a filehandle that was never initialized.
1043 You need to do an open() or a socket() call, or call a constructor from
1044 the FileHandle package.
1046 =item Filehandle %s opened for only input
1048 (W) You tried to write on a read-only filehandle. If you
1049 intended it to be a read-write filehandle, you needed to open it with
1050 "+E<lt>" or "+E<gt>" or "+E<gt>E<gt>" instead of with "E<lt>" or nothing. If
1051 you intended only to write the file, use "E<gt>" or "E<gt>E<gt>". See
1054 =item Filehandle opened for only input
1056 (W) You tried to write on a read-only filehandle. If you
1057 intended it to be a read-write filehandle, you needed to open it with
1058 "+E<lt>" or "+E<gt>" or "+E<gt>E<gt>" instead of with "E<lt>" or nothing. If
1059 you intended only to write the file, use "E<gt>" or "E<gt>E<gt>". See
1062 =item Final $ should be \$ or $name
1064 (F) You must now decide whether the final $ in a string was meant to be
1065 a literal dollar sign, or was meant to introduce a variable name
1066 that happens to be missing. So you have to put either the backslash or
1069 =item Final @ should be \@ or @name
1071 (F) You must now decide whether the final @ in a string was meant to be
1072 a literal "at" sign, or was meant to introduce a variable name
1073 that happens to be missing. So you have to put either the backslash or
1076 =item Format %s redefined
1078 (W) You redefined a format. To suppress this warning, say
1082 eval "format NAME =...";
1085 =item Format not terminated
1087 (F) A format must be terminated by a line with a solitary dot. Perl got
1088 to the end of your file without finding such a line.
1090 =item Found = in conditional, should be ==
1100 (or something like that).
1102 =item gdbm store returned %d, errno %d, key "%s"
1104 (S) A warning from the GDBM_File extension that a store failed.
1106 =item gethostent not implemented
1108 (F) Your C library apparently doesn't implement gethostent(), probably
1109 because if it did, it'd feel morally obligated to return every hostname
1112 =item get{sock,peer}name() on closed fd
1114 (W) You tried to get a socket or peer socket name on a closed socket.
1115 Did you forget to check the return value of your socket() call?
1117 =item getpwnam returned invalid UIC %#o for user "%s"
1119 (S) A warning peculiar to VMS. The call to C<sys$getuai> underlying the
1120 C<getpwnam> operator returned an invalid UIC.
1123 =item Glob not terminated
1125 (F) The lexer saw a left angle bracket in a place where it was expecting
1126 a term, so it's looking for the corresponding right angle bracket, and not
1127 finding it. Chances are you left some needed parentheses out earlier in
1128 the line, and you really meant a "less than".
1130 =item Global symbol "%s" requires explicit package name
1132 (F) You've said "use strict vars", which indicates that all variables
1133 must either be lexically scoped (using "my"), or explicitly qualified to
1134 say which package the global variable is in (using "::").
1136 =item goto must have label
1138 (F) Unlike with "next" or "last", you're not allowed to goto an
1139 unspecified destination. See L<perlfunc/goto>.
1141 =item Had to create %s unexpectedly
1143 (S) A routine asked for a symbol from a symbol table that ought to have
1144 existed already, but for some reason it didn't, and had to be created on
1145 an emergency basis to prevent a core dump.
1147 =item Hash %%s missing the % in argument %d of %s()
1149 (D) Really old Perl let you omit the % on hash names in some spots. This
1150 is now heavily deprecated.
1152 =item Identifier too long
1154 (F) Perl limits identifiers (names for variables, functions, etc.) to
1155 about 250 characters for simple names, and somewhat more for compound
1156 names (like C<$A::B>). You've exceeded Perl's limits. Future
1157 versions of Perl are likely to eliminate these arbitrary limitations.
1159 =item Ill-formed logical name |%s| in prime_env_iter
1161 (W) A warning peculiar to VMS. A logical name was encountered when preparing
1162 to iterate over %ENV which violates the syntactic rules governing logical
1163 names. Because it cannot be translated normally, it is skipped, and will not
1164 appear in %ENV. This may be a benign occurrence, as some software packages
1165 might directly modify logical name tables and introduce nonstandard names,
1166 or it may indicate that a logical name table has been corrupted.
1168 =item Illegal character %s (carriage return)
1170 (F) A carriage return character was found in the input. This is an
1171 error, and not a warning, because carriage return characters can break
1172 multi-line strings, including here documents (e.g., C<print E<lt>E<lt>EOF;>).
1174 Under Unix, this error is usually caused by executing Perl code --
1175 either the main program, a module, or an eval'd string -- that was
1176 transferred over a network connection from a non-Unix system without
1177 properly converting the text file format.
1179 Under systems that use something other than '\n' to delimit lines of
1180 text, this error can also be caused by reading Perl code from a file
1181 handle that is in binary mode (as set by the C<binmode> operator).
1183 In either case, the Perl code in question will probably need to be
1184 converted with something like C<s/\x0D\x0A?/\n/g> before it can be
1187 =item Illegal division by zero
1189 (F) You tried to divide a number by 0. Either something was wrong in your
1190 logic, or you need to put a conditional in to guard against meaningless input.
1192 =item Illegal modulus zero
1194 (F) You tried to divide a number by 0 to get the remainder. Most numbers
1195 don't take to this kindly.
1197 =item Illegal octal digit
1199 (F) You used an 8 or 9 in a octal number.
1201 =item Illegal octal digit ignored
1203 (W) You may have tried to use an 8 or 9 in a octal number. Interpretation
1204 of the octal number stopped before the 8 or 9.
1206 =item Illegal switch in PERL5OPT: %s
1208 (X) The PERL5OPT environment variable may only be used to set the
1209 following switches: B<-[DIMUdmw]>.
1211 =item In string, @%s now must be written as \@%s
1213 (F) It used to be that Perl would try to guess whether you wanted an
1214 array interpolated or a literal @. It did this when the string was first
1215 used at runtime. Now strings are parsed at compile time, and ambiguous
1216 instances of @ must be disambiguated, either by prepending a backslash to
1217 indicate a literal, or by declaring (or using) the array within the
1218 program before the string (lexically). (Someday it will simply assume
1219 that an unbackslashed @ interpolates an array.)
1221 =item Insecure dependency in %s
1223 (F) You tried to do something that the tainting mechanism didn't like.
1224 The tainting mechanism is turned on when you're running setuid or setgid,
1225 or when you specify B<-T> to turn it on explicitly. The tainting mechanism
1226 labels all data that's derived directly or indirectly from the user,
1227 who is considered to be unworthy of your trust. If any such data is
1228 used in a "dangerous" operation, you get this error. See L<perlsec>
1229 for more information.
1231 =item Insecure directory in %s
1233 (F) You can't use system(), exec(), or a piped open in a setuid or setgid
1234 script if C<$ENV{PATH}> contains a directory that is writable by the world.
1239 (F) You can't use system(), exec(), or a piped open in a setuid or
1240 setgid script if C<$ENV{PATH}> is derived from data supplied (or
1241 potentially supplied) by the user. The script must set the path to a
1242 known value, using trustworthy data. See L<perlsec>.
1244 =item Integer overflow in hex number
1246 (S) The literal hex number you have specified is too big for your
1247 architecture. On a 32-bit architecture the largest hex literal is
1250 =item Integer overflow in octal number
1252 (S) The literal octal number you have specified is too big for your
1253 architecture. On a 32-bit architecture the largest octal literal is
1256 =item Internal inconsistency in tracking vforks
1258 (S) A warning peculiar to VMS. Perl keeps track of the number
1259 of times you've called C<fork> and C<exec>, to determine
1260 whether the current call to C<exec> should affect the current
1261 script or a subprocess (see L<perlvms/exec>). Somehow, this count
1262 has become scrambled, so Perl is making a guess and treating
1263 this C<exec> as a request to terminate the Perl script
1264 and execute the specified command.
1266 =item internal disaster in regexp
1268 (P) Something went badly wrong in the regular expression parser.
1270 =item internal error: glob failed
1272 (P) Something went wrong with the external program(s) used for C<glob>
1273 and C<E<lt>*.cE<gt>>. This may mean that your csh (C shell) is
1274 broken. If so, you should change all of the csh-related variables in
1275 config.sh: If you have tcsh, make the variables refer to it as if it
1276 were csh (e.g. C<full_csh='/usr/bin/tcsh'>); otherwise, make them all
1277 empty (except that C<d_csh> should be C<'undef'>) so that Perl will
1278 think csh is missing. In either case, after editing config.sh, run
1279 C<./Configure -S> and rebuild Perl.
1281 =item internal urp in regexp at /%s/
1283 (P) Something went badly awry in the regular expression parser.
1285 =item invalid [] range in regexp
1287 (F) The range specified in a character class had a minimum character
1288 greater than the maximum character. See L<perlre>.
1290 =item Invalid conversion in %s: "%s"
1292 (W) Perl does not understand the given format conversion.
1293 See L<perlfunc/sprintf>.
1295 =item Invalid type in pack: '%s'
1297 (F) The given character is not a valid pack type. See L<perlfunc/pack>.
1299 =item Invalid type in unpack: '%s'
1301 (F) The given character is not a valid unpack type. See L<perlfunc/unpack>.
1303 =item ioctl is not implemented
1305 (F) Your machine apparently doesn't implement ioctl(), which is pretty
1306 strange for a machine that supports C.
1308 =item junk on end of regexp
1310 (P) The regular expression parser is confused.
1312 =item Label not found for "last %s"
1314 (F) You named a loop to break out of, but you're not currently in a
1315 loop of that name, not even if you count where you were called from.
1316 See L<perlfunc/last>.
1318 =item Label not found for "next %s"
1320 (F) You named a loop to continue, but you're not currently in a loop of
1321 that name, not even if you count where you were called from. See
1324 =item Label not found for "redo %s"
1326 (F) You named a loop to restart, but you're not currently in a loop of
1327 that name, not even if you count where you were called from. See
1330 =item listen() on closed fd
1332 (W) You tried to do a listen on a closed socket. Did you forget to check
1333 the return value of your socket() call? See L<perlfunc/listen>.
1335 =item Method for operation %s not found in package %s during blessing
1337 (F) An attempt was made to specify an entry in an overloading table that
1338 doesn't resolve to a valid subroutine. See L<overload>.
1340 =item Might be a runaway multi-line %s string starting on line %d
1342 (S) An advisory indicating that the previous error may have been caused
1343 by a missing delimiter on a string or pattern, because it eventually
1344 ended earlier on the current line.
1346 =item Misplaced _ in number
1348 (W) An underline in a decimal constant wasn't on a 3-digit boundary.
1350 =item Missing $ on loop variable
1352 (F) Apparently you've been programming in B<csh> too much. Variables are always
1353 mentioned with the $ in Perl, unlike in the shells, where it can vary from
1354 one line to the next.
1356 =item Missing comma after first argument to %s function
1358 (F) While certain functions allow you to specify a filehandle or an
1359 "indirect object" before the argument list, this ain't one of them.
1361 =item Missing operator before %s?
1363 (S) This is an educated guess made in conjunction with the message "%s
1364 found where operator expected". Often the missing operator is a comma.
1366 =item Missing right bracket
1368 (F) The lexer counted more opening curly brackets (braces) than closing ones.
1369 As a general rule, you'll find it's missing near the place you were last
1372 =item Missing semicolon on previous line?
1374 (S) This is an educated guess made in conjunction with the message "%s
1375 found where operator expected". Don't automatically put a semicolon on
1376 the previous line just because you saw this message.
1378 =item Modification of a read-only value attempted
1380 (F) You tried, directly or indirectly, to change the value of a
1381 constant. You didn't, of course, try "2 = 1", because the compiler
1382 catches that. But an easy way to do the same thing is:
1384 sub mod { $_[0] = 1 }
1387 Another way is to assign to a substr() that's off the end of the string.
1389 =item Modification of noncreatable array value attempted, subscript %d
1391 (F) You tried to make an array value spring into existence, and the
1392 subscript was probably negative, even counting from end of the array
1395 =item Modification of noncreatable hash value attempted, subscript "%s"
1397 (F) You tried to make a hash value spring into existence, and it couldn't
1398 be created for some peculiar reason.
1400 =item Module name must be constant
1402 (F) Only a bare module name is allowed as the first argument to a "use".
1404 =item msg%s not implemented
1406 (F) You don't have System V message IPC on your system.
1408 =item Multidimensional syntax %s not supported
1410 (W) Multidimensional arrays aren't written like C<$foo[1,2,3]>. They're written
1411 like C<$foo[1][2][3]>, as in C.
1413 =item Name "%s::%s" used only once: possible typo
1415 (W) Typographical errors often show up as unique variable names.
1416 If you had a good reason for having a unique name, then just mention
1417 it again somehow to suppress the message. The C<use vars> pragma is
1418 provided for just this purpose.
1420 =item Negative length
1422 (F) You tried to do a read/write/send/recv operation with a buffer length
1423 that is less than 0. This is difficult to imagine.
1425 =item nested *?+ in regexp
1427 (F) You can't quantify a quantifier without intervening parentheses. So
1428 things like ** or +* or ?* are illegal.
1430 Note, however, that the minimal matching quantifiers, C<*?>, C<+?>, and C<??> appear
1431 to be nested quantifiers, but aren't. See L<perlre>.
1435 (F) The setuid emulator requires that scripts have a well-formed #! line
1436 even on machines that don't support the #! construct.
1438 =item No %s allowed while running setuid
1440 (F) Certain operations are deemed to be too insecure for a setuid or setgid
1441 script to even be allowed to attempt. Generally speaking there will be
1442 another way to do what you want that is, if not secure, at least securable.
1445 =item No B<-e> allowed in setuid scripts
1447 (F) A setuid script can't be specified by the user.
1449 =item No comma allowed after %s
1451 (F) A list operator that has a filehandle or "indirect object" is not
1452 allowed to have a comma between that and the following arguments.
1453 Otherwise it'd be just another one of the arguments.
1455 One possible cause for this is that you expected to have imported a
1456 constant to your name space with B<use> or B<import> while no such
1457 importing took place, it may for example be that your operating system
1458 does not support that particular constant. Hopefully you did use an
1459 explicit import list for the constants you expect to see, please see
1460 L<perlfunc/use> and L<perlfunc/import>. While an explicit import list
1461 would probably have caught this error earlier it naturally does not
1462 remedy the fact that your operating system still does not support that
1463 constant. Maybe you have a typo in the constants of the symbol import
1464 list of B<use> or B<import> or in the constant name at the line where
1465 this error was triggered?
1467 =item No command into which to pipe on command line
1469 (F) An error peculiar to VMS. Perl handles its own command line redirection,
1470 and found a '|' at the end of the command line, so it doesn't know where you
1471 want to pipe the output from this command.
1473 =item No DB::DB routine defined
1475 (F) The currently executing code was compiled with the B<-d> switch,
1476 but for some reason the perl5db.pl file (or some facsimile thereof)
1477 didn't define a routine to be called at the beginning of each
1478 statement. Which is odd, because the file should have been required
1479 automatically, and should have blown up the require if it didn't parse
1482 =item No dbm on this machine
1484 (P) This is counted as an internal error, because every machine should
1485 supply dbm nowadays, because Perl comes with SDBM. See L<SDBM_File>.
1487 =item No DBsub routine
1489 (F) The currently executing code was compiled with the B<-d> switch,
1490 but for some reason the perl5db.pl file (or some facsimile thereof)
1491 didn't define a DB::sub routine to be called at the beginning of each
1492 ordinary subroutine call.
1494 =item No error file after 2E<gt> or 2E<gt>E<gt> on command line
1496 (F) An error peculiar to VMS. Perl handles its own command line redirection,
1497 and found a '2E<gt>' or a '2E<gt>E<gt>' on the command line, but can't find
1498 the name of the file to which to write data destined for stderr.
1500 =item No input file after E<lt> on command line
1502 (F) An error peculiar to VMS. Perl handles its own command line redirection,
1503 and found a 'E<lt>' on the command line, but can't find the name of the file
1504 from which to read data for stdin.
1506 =item No output file after E<gt> on command line
1508 (F) An error peculiar to VMS. Perl handles its own command line redirection,
1509 and found a lone 'E<gt>' at the end of the command line, so it doesn't know
1510 where you wanted to redirect stdout.
1512 =item No output file after E<gt> or E<gt>E<gt> on command line
1514 (F) An error peculiar to VMS. Perl handles its own command line redirection,
1515 and found a 'E<gt>' or a 'E<gt>E<gt>' on the command line, but can't find the
1516 name of the file to which to write data destined for stdout.
1518 =item No Perl script found in input
1520 (F) You called C<perl -x>, but no line was found in the file beginning
1521 with #! and containing the word "perl".
1523 =item No setregid available
1525 (F) Configure didn't find anything resembling the setregid() call for
1528 =item No setreuid available
1530 (F) Configure didn't find anything resembling the setreuid() call for
1533 =item No space allowed after B<-I>
1535 (F) The argument to B<-I> must follow the B<-I> immediately with no
1538 =item No such pipe open
1540 (P) An error peculiar to VMS. The internal routine my_pclose() tried to
1541 close a pipe which hadn't been opened. This should have been caught earlier as
1542 an attempt to close an unopened filehandle.
1544 =item No such signal: SIG%s
1546 (W) You specified a signal name as a subscript to %SIG that was not recognized.
1547 Say C<kill -l> in your shell to see the valid signal names on your system.
1549 =item Not a CODE reference
1551 (F) Perl was trying to evaluate a reference to a code value (that is, a
1552 subroutine), but found a reference to something else instead. You can
1553 use the ref() function to find out what kind of ref it really was.
1554 See also L<perlref>.
1556 =item Not a format reference
1558 (F) I'm not sure how you managed to generate a reference to an anonymous
1559 format, but this indicates you did, and that it didn't exist.
1561 =item Not a GLOB reference
1563 (F) Perl was trying to evaluate a reference to a "typeglob" (that is,
1564 a symbol table entry that looks like C<*foo>), but found a reference to
1565 something else instead. You can use the ref() function to find out
1566 what kind of ref it really was. See L<perlref>.
1568 =item Not a HASH reference
1570 (F) Perl was trying to evaluate a reference to a hash value, but
1571 found a reference to something else instead. You can use the ref()
1572 function to find out what kind of ref it really was. See L<perlref>.
1574 =item Not a perl script
1576 (F) The setuid emulator requires that scripts have a well-formed #! line
1577 even on machines that don't support the #! construct. The line must
1580 =item Not a SCALAR reference
1582 (F) Perl was trying to evaluate a reference to a scalar value, but
1583 found a reference to something else instead. You can use the ref()
1584 function to find out what kind of ref it really was. See L<perlref>.
1586 =item Not a subroutine reference
1588 (F) Perl was trying to evaluate a reference to a code value (that is, a
1589 subroutine), but found a reference to something else instead. You can
1590 use the ref() function to find out what kind of ref it really was.
1591 See also L<perlref>.
1593 =item Not a subroutine reference in overload table
1595 (F) An attempt was made to specify an entry in an overloading table that
1596 doesn't somehow point to a valid subroutine. See L<overload>.
1598 =item Not an ARRAY reference
1600 (F) Perl was trying to evaluate a reference to an array value, but
1601 found a reference to something else instead. You can use the ref()
1602 function to find out what kind of ref it really was. See L<perlref>.
1604 =item Not enough arguments for %s
1606 (F) The function requires more arguments than you specified.
1608 =item Not enough format arguments
1610 (W) A format specified more picture fields than the next line supplied.
1613 =item Null filename used
1615 (F) You can't require the null filename, especially because on many machines
1616 that means the current directory! See L<perlfunc/require>.
1618 =item Null picture in formline
1620 (F) The first argument to formline must be a valid format picture
1621 specification. It was found to be empty, which probably means you
1622 supplied it an uninitialized value. See L<perlform>.
1624 =item NULL OP IN RUN
1626 (P) Some internal routine called run() with a null opcode pointer.
1630 (P) An attempt was made to realloc NULL.
1632 =item NULL regexp argument
1634 (P) The internal pattern matching routines blew it big time.
1636 =item NULL regexp parameter
1638 (P) The internal pattern matching routines are out of their gourd.
1640 =item Number too long
1642 (F) Perl limits the representation of decimal numbers in programs to about
1643 about 250 characters. You've exceeded that length. Future versions of
1644 Perl are likely to eliminate this arbitrary limitation. In the meantime,
1645 try using scientific notation (e.g. "1e6" instead of "1_000_000").
1647 =item Odd number of elements in hash list
1649 (S) You specified an odd number of elements to a hash list, which is odd,
1650 because hash lists come in key/value pairs.
1652 =item Offset outside string
1654 (F) You tried to do a read/write/send/recv operation with an offset
1655 pointing outside the buffer. This is difficult to imagine.
1656 The sole exception to this is that C<sysread()>ing past the buffer
1657 will extend the buffer and zero pad the new area.
1661 (S) An internal warning that the grammar is screwed up.
1665 (S) An internal warning that the grammar is screwed up.
1667 =item Operation `%s': no method found,%s
1669 (F) An attempt was made to perform an overloaded operation for which
1670 no handler was defined. While some handlers can be autogenerated in
1671 terms of other handlers, there is no default handler for any
1672 operation, unless C<fallback> overloading key is specified to be
1673 true. See L<overload>.
1675 =item Operator or semicolon missing before %s
1677 (S) You used a variable or subroutine call where the parser was
1678 expecting an operator. The parser has assumed you really meant
1679 to use an operator, but this is highly likely to be incorrect.
1680 For example, if you say "*foo *foo" it will be interpreted as
1681 if you said "*foo * 'foo'".
1683 =item Out of memory for yacc stack
1685 (F) The yacc parser wanted to grow its stack so it could continue parsing,
1686 but realloc() wouldn't give it more memory, virtual or otherwise.
1688 =item Out of memory!
1690 (X|F) The malloc() function returned 0, indicating there was insufficient
1691 remaining memory (or virtual memory) to satisfy the request.
1693 The request was judged to be small, so the possibility to trap it
1694 depends on the way perl was compiled. By default it is not trappable.
1695 However, if compiled for this, Perl may use the contents of C<$^M> as
1696 an emergency pool after die()ing with this message. In this case the
1697 error is trappable I<once>.
1699 =item Out of memory during request for %s
1701 (F) The malloc() function returned 0, indicating there was insufficient
1702 remaining memory (or virtual memory) to satisfy the request. However,
1703 the request was judged large enough (compile-time default is 64K), so
1704 a possibility to shut down by trapping this error is granted.
1708 (W) A single call to write() produced more lines than can fit on a page.
1711 =item panic: ck_grep
1713 (P) Failed an internal consistency check trying to compile a grep.
1715 =item panic: ck_split
1717 (P) Failed an internal consistency check trying to compile a split.
1719 =item panic: corrupt saved stack index
1721 (P) The savestack was requested to restore more localized values than there
1722 are in the savestack.
1726 (P) We popped the context stack to an eval context, and then discovered
1727 it wasn't an eval context.
1729 =item panic: do_match
1731 (P) The internal pp_match() routine was called with invalid operational data.
1733 =item panic: do_split
1735 (P) Something terrible went wrong in setting up for the split.
1737 =item panic: do_subst
1739 (P) The internal pp_subst() routine was called with invalid operational data.
1741 =item panic: do_trans
1743 (P) The internal do_trans() routine was called with invalid operational data.
1747 (P) The library function frexp() failed, making printf("%f") impossible.
1751 (P) We popped the context stack to a context with the specified label,
1752 and then discovered it wasn't a context we know how to do a goto in.
1754 =item panic: INTERPCASEMOD
1756 (P) The lexer got into a bad state at a case modifier.
1758 =item panic: INTERPCONCAT
1760 (P) The lexer got into a bad state parsing a string with brackets.
1764 (P) We popped the context stack to a block context, and then discovered
1765 it wasn't a block context.
1767 =item panic: leave_scope clearsv
1769 (P) A writable lexical variable became read-only somehow within the scope.
1771 =item panic: leave_scope inconsistency
1773 (P) The savestack probably got out of sync. At least, there was an
1774 invalid enum on the top of it.
1778 (P) Something requested a negative number of bytes of malloc.
1780 =item panic: mapstart
1782 (P) The compiler is screwed up with respect to the map() function.
1784 =item panic: null array
1786 (P) One of the internal array routines was passed a null AV pointer.
1788 =item panic: pad_alloc
1790 (P) The compiler got confused about which scratch pad it was allocating
1791 and freeing temporaries and lexicals from.
1793 =item panic: pad_free curpad
1795 (P) The compiler got confused about which scratch pad it was allocating
1796 and freeing temporaries and lexicals from.
1798 =item panic: pad_free po
1800 (P) An invalid scratch pad offset was detected internally.
1802 =item panic: pad_reset curpad
1804 (P) The compiler got confused about which scratch pad it was allocating
1805 and freeing temporaries and lexicals from.
1807 =item panic: pad_sv po
1809 (P) An invalid scratch pad offset was detected internally.
1811 =item panic: pad_swipe curpad
1813 (P) The compiler got confused about which scratch pad it was allocating
1814 and freeing temporaries and lexicals from.
1816 =item panic: pad_swipe po
1818 (P) An invalid scratch pad offset was detected internally.
1820 =item panic: pp_iter
1822 (P) The foreach iterator got called in a non-loop context frame.
1824 =item panic: realloc
1826 (P) Something requested a negative number of bytes of realloc.
1828 =item panic: restartop
1830 (P) Some internal routine requested a goto (or something like it), and
1831 didn't supply the destination.
1835 (P) We popped the context stack to a subroutine or eval context, and
1836 then discovered it wasn't a subroutine or eval context.
1838 =item panic: scan_num
1840 (P) scan_num() got called on something that wasn't a number.
1842 =item panic: sv_insert
1844 (P) The sv_insert() routine was told to remove more string than there
1847 =item panic: top_env
1849 (P) The compiler attempted to do a goto, or something weird like that.
1853 (P) The lexer got into a bad state while processing a case modifier.
1855 =item Pareneses missing around "%s" list
1857 (W) You said something like
1863 my ($foo, $bar) = @_;
1865 Remember that "my" and "local" bind closer than comma.
1867 =item Perl %3.3f required--this is only version %s, stopped
1869 (F) The module in question uses features of a version of Perl more recent
1870 than the currently running version. How long has it been since you upgraded,
1871 anyway? See L<perlfunc/require>.
1873 =item Permission denied
1875 (F) The setuid emulator in suidperl decided you were up to no good.
1877 =item pid %d not a child
1879 (W) A warning peculiar to VMS. Waitpid() was asked to wait for a process which
1880 isn't a subprocess of the current process. While this is fine from VMS'
1881 perspective, it's probably not what you intended.
1883 =item POSIX getpgrp can't take an argument
1885 (F) Your C compiler uses POSIX getpgrp(), which takes no argument, unlike
1886 the BSD version, which takes a pid.
1888 =item Possible attempt to put comments in qw() list
1890 (W) qw() lists contain items separated by whitespace; as with literal
1891 strings, comment characters are not ignored, but are instead treated
1892 as literal data. (You may have used different delimiters than the
1893 exclamation marks parentheses shown here; braces are also frequently
1896 You probably wrote something like this:
1903 when you should have written this:
1910 If you really want comments, build your list the
1911 old-fashioned way, with quotes and commas:
1915 'b', # another comment
1918 =item Possible attempt to separate words with commas
1920 (W) qw() lists contain items separated by whitespace; therefore commas
1921 aren't needed to separate the items. (You may have used different
1922 delimiters than the parentheses shown here; braces are also frequently
1925 You probably wrote something like this:
1929 which puts literal commas into some of the list items. Write it without
1930 commas if you don't want them to appear in your data:
1934 =item Possible memory corruption: %s overflowed 3rd argument
1936 (F) An ioctl() or fcntl() returned more than Perl was bargaining for.
1937 Perl guesses a reasonable buffer size, but puts a sentinel byte at the
1938 end of the buffer just in case. This sentinel byte got clobbered, and
1939 Perl assumes that memory is now corrupted. See L<perlfunc/ioctl>.
1941 =item Precedence problem: open %s should be open(%s)
1943 (S) The old irregular construct
1947 is now misinterpreted as
1951 because of the strict regularization of Perl 5's grammar into unary
1952 and list operators. (The old open was a little of both.) You must
1953 put parentheses around the filehandle, or use the new "or" operator
1956 =item print on closed filehandle %s
1958 (W) The filehandle you're printing on got itself closed sometime before now.
1959 Check your logic flow.
1961 =item printf on closed filehandle %s
1963 (W) The filehandle you're writing to got itself closed sometime before now.
1964 Check your logic flow.
1966 =item Probable precedence problem on %s
1968 (W) The compiler found a bareword where it expected a conditional,
1969 which often indicates that an || or && was parsed as part of the
1970 last argument of the previous construct, for example:
1974 =item Prototype mismatch: %s vs %s
1976 (S) The subroutine being declared or defined had previously been declared
1977 or defined with a different function prototype.
1979 =item Read on closed filehandle E<lt>%sE<gt>
1981 (W) The filehandle you're reading from got itself closed sometime before now.
1982 Check your logic flow.
1984 =item Reallocation too large: %lx
1986 (F) You can't allocate more than 64K on an MS-DOS machine.
1988 =item Recompile perl with B<-D>DEBUGGING to use B<-D> switch
1990 (F) You can't use the B<-D> option unless the code to produce the
1991 desired output is compiled into Perl, which entails some overhead,
1992 which is why it's currently left out of your copy.
1994 =item Recursive inheritance detected
1996 (F) More than 100 levels of inheritance were used. Probably indicates
1997 an unintended loop in your inheritance hierarchy.
1999 =item Reference miscount in sv_replace()
2001 (W) The internal sv_replace() function was handed a new SV with a
2002 reference count of other than 1.
2004 =item regexp memory corruption
2006 (P) The regular expression engine got confused by what the regular
2007 expression compiler gave it.
2009 =item regexp out of space
2011 (P) A "can't happen" error, because safemalloc() should have caught it earlier.
2013 =item regexp too big
2015 (F) The current implementation of regular expressions uses shorts as
2016 address offsets within a string. Unfortunately this means that if
2017 the regular expression compiles to longer than 32767, it'll blow up.
2018 Usually when you want a regular expression this big, there is a better
2019 way to do it with multiple statements. See L<perlre>.
2021 =item Reversed %s= operator
2023 (W) You wrote your assignment operator backwards. The = must always
2024 comes last, to avoid ambiguity with subsequent unary operators.
2026 =item Runaway format
2028 (F) Your format contained the ~~ repeat-until-blank sequence, but it
2029 produced 200 lines at once, and the 200th line looked exactly like the
2030 199th line. Apparently you didn't arrange for the arguments to exhaust
2031 themselves, either by using ^ instead of @ (for scalar variables), or by
2032 shifting or popping (for array variables). See L<perlform>.
2034 =item Scalar value @%s[%s] better written as $%s[%s]
2036 (W) You've used an array slice (indicated by @) to select a single element of
2037 an array. Generally it's better to ask for a scalar value (indicated by $).
2038 The difference is that C<$foo[&bar]> always behaves like a scalar, both when
2039 assigning to it and when evaluating its argument, while C<@foo[&bar]> behaves
2040 like a list when you assign to it, and provides a list context to its
2041 subscript, which can do weird things if you're expecting only one subscript.
2043 On the other hand, if you were actually hoping to treat the array
2044 element as a list, you need to look into how references work, because
2045 Perl will not magically convert between scalars and lists for you. See
2048 =item Scalar value @%s{%s} better written as $%s{%s}
2050 (W) You've used a hash slice (indicated by @) to select a single element of
2051 a hash. Generally it's better to ask for a scalar value (indicated by $).
2052 The difference is that C<$foo{&bar}> always behaves like a scalar, both when
2053 assigning to it and when evaluating its argument, while C<@foo{&bar}> behaves
2054 like a list when you assign to it, and provides a list context to its
2055 subscript, which can do weird things if you're expecting only one subscript.
2057 On the other hand, if you were actually hoping to treat the hash
2058 element as a list, you need to look into how references work, because
2059 Perl will not magically convert between scalars and lists for you. See
2062 =item Script is not setuid/setgid in suidperl
2064 (F) Oddly, the suidperl program was invoked on a script without a setuid
2065 or setgid bit set. This doesn't make much sense.
2067 =item Search pattern not terminated
2069 (F) The lexer couldn't find the final delimiter of a // or m{}
2070 construct. Remember that bracketing delimiters count nesting level.
2072 =item %sseek() on unopened file
2074 (W) You tried to use the seek() or sysseek() function on a filehandle that
2075 was either never opened or has since been closed.
2077 =item select not implemented
2079 (F) This machine doesn't implement the select() system call.
2081 =item sem%s not implemented
2083 (F) You don't have System V semaphore IPC on your system.
2085 =item semi-panic: attempt to dup freed string
2087 (S) The internal newSVsv() routine was called to duplicate a scalar
2088 that had previously been marked as free.
2090 =item Semicolon seems to be missing
2092 (W) A nearby syntax error was probably caused by a missing semicolon,
2093 or possibly some other missing operator, such as a comma.
2095 =item Send on closed socket
2097 (W) The filehandle you're sending to got itself closed sometime before now.
2098 Check your logic flow.
2100 =item Sequence (? incomplete
2101 (F) A regular expression ended with an incomplete extension (?.
2104 =item Sequence (?#... not terminated
2106 (F) A regular expression comment must be terminated by a closing
2107 parenthesis. Embedded parentheses aren't allowed. See L<perlre>.
2109 =item Sequence (?%s...) not implemented
2111 (F) A proposed regular expression extension has the character reserved
2112 but has not yet been written. See L<perlre>.
2114 =item Sequence (?%s...) not recognized
2116 (F) You used a regular expression extension that doesn't make sense.
2121 Also known as "500 Server error".
2123 B<This is a CGI error, not a Perl error>.
2125 You need to make sure your script is executable, is accessible by the user
2126 CGI is running the script under (which is probably not the user account you
2127 tested it under), does not rely on any environment variables (like PATH)
2128 from the user it isn't running under, and isn't in a location where the CGI
2129 server can't find it, basically, more or less. Please see the following
2130 for more information:
2132 http://www.perl.com/perl/faq/idiots-guide.html
2133 http://www.perl.com/perl/faq/perl-cgi-faq.html
2134 ftp://rtfm.mit.edu/pub/usenet/news.answers/www/cgi-faq
2135 http://hoohoo.ncsa.uiuc.edu/cgi/interface.html
2136 http://www-genome.wi.mit.edu/WWW/faqs/www-security-faq.html
2138 =item setegid() not implemented
2140 (F) You tried to assign to C<$)>, and your operating system doesn't support
2141 the setegid() system call (or equivalent), or at least Configure didn't
2144 =item seteuid() not implemented
2146 (F) You tried to assign to C<$E<gt>>, and your operating system doesn't support
2147 the seteuid() system call (or equivalent), or at least Configure didn't
2150 =item setrgid() not implemented
2152 (F) You tried to assign to C<$(>, and your operating system doesn't support
2153 the setrgid() system call (or equivalent), or at least Configure didn't
2156 =item setruid() not implemented
2158 (F) You tried to assign to C<$E<lt>>, and your operating system doesn't support
2159 the setruid() system call (or equivalent), or at least Configure didn't
2162 =item Setuid/gid script is writable by world
2164 (F) The setuid emulator won't run a script that is writable by the world,
2165 because the world might have written on it already.
2167 =item shm%s not implemented
2169 (F) You don't have System V shared memory IPC on your system.
2171 =item shutdown() on closed fd
2173 (W) You tried to do a shutdown on a closed socket. Seems a bit superfluous.
2175 =item SIG%s handler "%s" not defined
2177 (W) The signal handler named in %SIG doesn't, in fact, exist. Perhaps you
2178 put it into the wrong package?
2180 =item sort is now a reserved word
2182 (F) An ancient error message that almost nobody ever runs into anymore.
2183 But before sort was a keyword, people sometimes used it as a filehandle.
2185 =item Sort subroutine didn't return a numeric value
2187 (F) A sort comparison routine must return a number. You probably blew
2188 it by not using C<E<lt>=E<gt>> or C<cmp>, or by not using them correctly.
2189 See L<perlfunc/sort>.
2191 =item Sort subroutine didn't return single value
2193 (F) A sort comparison subroutine may not return a list value with more
2194 or less than one element. See L<perlfunc/sort>.
2198 (P) The split was looping infinitely. (Obviously, a split shouldn't iterate
2199 more times than there are characters of input, which is what happened.)
2200 See L<perlfunc/split>.
2202 =item Stat on unopened file E<lt>%sE<gt>
2204 (W) You tried to use the stat() function (or an equivalent file test)
2205 on a filehandle that was either never opened or has since been closed.
2207 =item Statement unlikely to be reached
2209 (W) You did an exec() with some statement after it other than a die().
2210 This is almost always an error, because exec() never returns unless
2211 there was a failure. You probably wanted to use system() instead,
2212 which does return. To suppress this warning, put the exec() in a block
2215 =item Stub found while resolving method `%s' overloading `%s' in package `%s'
2217 (P) Overloading resolution over @ISA tree may be broken by importation stubs.
2218 Stubs should never be implicitely created, but explicit calls to C<can>
2221 =item Subroutine %s redefined
2223 (W) You redefined a subroutine. To suppress this warning, say
2227 eval "sub name { ... }";
2230 =item Substitution loop
2232 (P) The substitution was looping infinitely. (Obviously, a
2233 substitution shouldn't iterate more times than there are characters of
2234 input, which is what happened.) See the discussion of substitution in
2235 L<perlop/"Quote and Quote-like Operators">.
2237 =item Substitution pattern not terminated
2239 (F) The lexer couldn't find the interior delimiter of a s/// or s{}{}
2240 construct. Remember that bracketing delimiters count nesting level.
2242 =item Substitution replacement not terminated
2244 (F) The lexer couldn't find the final delimiter of a s/// or s{}{}
2245 construct. Remember that bracketing delimiters count nesting level.
2247 =item substr outside of string
2249 (S),(W) You tried to reference a substr() that pointed outside of a
2250 string. That is, the absolute value of the offset was larger than the
2251 length of the string. See L<perlfunc/substr>. This warning is
2252 mandatory if substr is used in an lvalue context (as the left hand side
2253 of an assignment or as a subroutine argument for example).
2255 =item suidperl is no longer needed since %s
2257 (F) Your Perl was compiled with B<-D>SETUID_SCRIPTS_ARE_SECURE_NOW, but a
2258 version of the setuid emulator somehow got run anyway.
2262 (F) Probably means you had a syntax error. Common reasons include:
2264 A keyword is misspelled.
2265 A semicolon is missing.
2267 An opening or closing parenthesis is missing.
2268 An opening or closing brace is missing.
2269 A closing quote is missing.
2271 Often there will be another error message associated with the syntax
2272 error giving more information. (Sometimes it helps to turn on B<-w>.)
2273 The error message itself often tells you where it was in the line when
2274 it decided to give up. Sometimes the actual error is several tokens
2275 before this, because Perl is good at understanding random input.
2276 Occasionally the line number may be misleading, and once in a blue moon
2277 the only way to figure out what's triggering the error is to call
2278 C<perl -c> repeatedly, chopping away half the program each time to see
2279 if the error went away. Sort of the cybernetic version of S<20 questions>.
2281 =item syntax error at line %d: `%s' unexpected
2283 (A) You've accidentally run your script through the Bourne shell
2284 instead of Perl. Check the #! line, or manually feed your script
2287 =item System V IPC is not implemented on this machine
2289 (F) You tried to do something with a function beginning with "sem", "shm",
2290 or "msg". See L<perlfunc/semctl>, for example.
2292 =item Syswrite on closed filehandle
2294 (W) The filehandle you're writing to got itself closed sometime before now.
2295 Check your logic flow.
2297 =item Target of goto is too deeply nested
2299 (F) You tried to use C<goto> to reach a label that was too deeply
2300 nested for Perl to reach. Perl is doing you a favor by refusing.
2302 =item tell() on unopened file
2304 (W) You tried to use the tell() function on a filehandle that was either
2305 never opened or has since been closed.
2307 =item Test on unopened file E<lt>%sE<gt>
2309 (W) You tried to invoke a file test operator on a filehandle that isn't
2310 open. Check your logic. See also L<perlfunc/-X>.
2312 =item That use of $[ is unsupported
2314 (F) Assignment to C<$[> is now strictly circumscribed, and interpreted as
2315 a compiler directive. You may say only one of
2324 This is to prevent the problem of one module changing the array base
2325 out from under another module inadvertently. See L<perlvar/$[>.
2327 =item The %s function is unimplemented
2329 The function indicated isn't implemented on this architecture, according
2330 to the probings of Configure.
2332 =item The crypt() function is unimplemented due to excessive paranoia
2334 (F) Configure couldn't find the crypt() function on your machine,
2335 probably because your vendor didn't supply it, probably because they
2336 think the U.S. Government thinks it's a secret, or at least that they
2337 will continue to pretend that it is. And if you quote me on that, I
2340 =item The stat preceding C<-l _> wasn't an lstat
2342 (F) It makes no sense to test the current stat buffer for symbolic linkhood
2343 if the last stat that wrote to the stat buffer already went past
2344 the symlink to get to the real file. Use an actual filename instead.
2346 =item times not implemented
2348 (F) Your version of the C library apparently doesn't do times(). I suspect
2349 you're not running on Unix.
2351 =item Too few args to syscall
2353 (F) There has to be at least one argument to syscall() to specify the
2354 system call to call, silly dilly.
2356 =item Too late for "B<-T>" option
2358 (X) The #! line (or local equivalent) in a Perl script contains the
2359 B<-T> option, but Perl was not invoked with B<-T> in its command line.
2360 This is an error because, by the time Perl discovers a B<-T> in a
2361 script, it's too late to properly taint everything from the environment.
2364 If the Perl script is being executed as a command using the #!
2365 mechanism (or its local equivalent), this error can usually be fixed
2366 by editing the #! line so that the B<-T> option is a part of Perl's
2367 first argument: e.g. change C<perl -n -T> to C<perl -T -n>.
2369 If the Perl script is being executed as C<perl scriptname>, then the
2370 B<-T> option must appear on the command line: C<perl -T scriptname>.
2372 =item Too late for "-%s" option
2374 (X) The #! line (or local equivalent) in a Perl script contains the
2375 B<-M> or B<-m> option. This is an error because B<-M> and B<-m> options
2376 are not intended for use inside scripts. Use the C<use> pragma instead.
2382 (A) You've accidentally run your script through B<csh> instead
2383 of Perl. Check the #! line, or manually feed your script into
2386 =item Too many args to syscall
2388 (F) Perl supports a maximum of only 14 args to syscall().
2390 =item Too many arguments for %s
2392 (F) The function requires fewer arguments than you specified.
2394 =item trailing \ in regexp
2396 (F) The regular expression ends with an unbackslashed backslash. Backslash
2399 =item Translation pattern not terminated
2401 (F) The lexer couldn't find the interior delimiter of a tr/// or tr[][]
2404 =item Translation replacement not terminated
2406 (F) The lexer couldn't find the final delimiter of a tr/// or tr[][]
2409 =item truncate not implemented
2411 (F) Your machine doesn't implement a file truncation mechanism that
2412 Configure knows about.
2414 =item Type of arg %d to %s must be %s (not %s)
2416 (F) This function requires the argument in that position to be of a
2417 certain type. Arrays must be @NAME or C<@{EXPR}>. Hashes must be
2418 %NAME or C<%{EXPR}>. No implicit dereferencing is allowed--use the
2419 {EXPR} forms as an explicit dereference. See L<perlref>.
2421 =item umask: argument is missing initial 0
2423 (W) A umask of 222 is incorrect. It should be 0222, because octal literals
2424 always start with 0 in Perl, as in C.
2426 =item Unable to create sub named "%s"
2428 (F) You attempted to create or access a subroutine with an illegal name.
2430 =item Unbalanced context: %d more PUSHes than POPs
2432 (W) The exit code detected an internal inconsistency in how many execution
2433 contexts were entered and left.
2435 =item Unbalanced saves: %d more saves than restores
2437 (W) The exit code detected an internal inconsistency in how many
2438 values were temporarily localized.
2440 =item Unbalanced scopes: %d more ENTERs than LEAVEs
2442 (W) The exit code detected an internal inconsistency in how many blocks
2443 were entered and left.
2445 =item Unbalanced tmps: %d more allocs than frees
2447 (W) The exit code detected an internal inconsistency in how many mortal
2448 scalars were allocated and freed.
2450 =item Undefined format "%s" called
2452 (F) The format indicated doesn't seem to exist. Perhaps it's really in
2453 another package? See L<perlform>.
2455 =item Undefined sort subroutine "%s" called
2457 (F) The sort comparison routine specified doesn't seem to exist. Perhaps
2458 it's in a different package? See L<perlfunc/sort>.
2460 =item Undefined subroutine &%s called
2462 (F) The subroutine indicated hasn't been defined, or if it was, it
2463 has since been undefined.
2465 =item Undefined subroutine called
2467 (F) The anonymous subroutine you're trying to call hasn't been defined,
2468 or if it was, it has since been undefined.
2470 =item Undefined subroutine in sort
2472 (F) The sort comparison routine specified is declared but doesn't seem to
2473 have been defined yet. See L<perlfunc/sort>.
2475 =item Undefined top format "%s" called
2477 (F) The format indicated doesn't seem to exist. Perhaps it's really in
2478 another package? See L<perlform>.
2480 =item unexec of %s into %s failed!
2482 (F) The unexec() routine failed for some reason. See your local FSF
2483 representative, who probably put it there in the first place.
2485 =item Unknown BYTEORDER
2487 (F) There are no byte-swapping functions for a machine with this byte order.
2489 =item unmatched () in regexp
2491 (F) Unbackslashed parentheses must always be balanced in regular
2492 expressions. If you're a vi user, the % key is valuable for finding
2493 the matching parenthesis. See L<perlre>.
2495 =item Unmatched right bracket
2497 (F) The lexer counted more closing curly brackets (braces) than opening
2498 ones, so you're probably missing an opening bracket. As a general
2499 rule, you'll find the missing one (so to speak) near the place you were
2502 =item unmatched [] in regexp
2504 (F) The brackets around a character class must match. If you wish to
2505 include a closing bracket in a character class, backslash it or put it first.
2508 =item Unquoted string "%s" may clash with future reserved word
2510 (W) You used a bareword that might someday be claimed as a reserved word.
2511 It's best to put such a word in quotes, or capitalize it somehow, or insert
2512 an underbar into it. You might also declare it as a subroutine.
2514 =item Unrecognized character %s
2516 (F) The Perl parser has no idea what to do with the specified character
2517 in your Perl script (or eval). Perhaps you tried to run a compressed
2518 script, a binary program, or a directory as a Perl program.
2520 =item Unrecognized signal name "%s"
2522 (F) You specified a signal name to the kill() function that was not recognized.
2523 Say C<kill -l> in your shell to see the valid signal names on your system.
2525 =item Unrecognized switch: -%s
2527 (F) You specified an illegal option to Perl. Don't do that.
2528 (If you think you didn't do that, check the #! line to see if it's
2529 supplying the bad switch on your behalf.)
2531 =item Unsuccessful %s on filename containing newline
2533 (W) A file operation was attempted on a filename, and that operation
2534 failed, PROBABLY because the filename contained a newline, PROBABLY
2535 because you forgot to chop() or chomp() it off. See L<perlfunc/chomp>.
2537 =item Unsupported directory function "%s" called
2539 (F) Your machine doesn't support opendir() and readdir().
2541 =item Unsupported function fork
2543 (F) Your version of executable does not support forking.
2545 Note that under some systems, like OS/2, there may be different flavors of
2546 Perl executables, some of which may support fork, some not. Try changing
2547 the name you call Perl by to C<perl_>, C<perl__>, and so on.
2549 =item Unsupported function %s
2551 (F) This machines doesn't implement the indicated function, apparently.
2552 At least, Configure doesn't think so.
2554 =item Unsupported socket function "%s" called
2556 (F) Your machine doesn't support the Berkeley socket mechanism, or at
2557 least that's what Configure thought.
2559 =item Unterminated E<lt>E<gt> operator
2561 (F) The lexer saw a left angle bracket in a place where it was expecting
2562 a term, so it's looking for the corresponding right angle bracket, and not
2563 finding it. Chances are you left some needed parentheses out earlier in
2564 the line, and you really meant a "less than".
2566 =item Use of "$$<digit>" to mean "${$}<digit>" is deprecated
2568 (D) Perl versions before 5.004 misinterpreted any type marker followed
2569 by "$" and a digit. For example, "$$0" was incorrectly taken to mean
2570 "${$}0" instead of "${$0}". This bug is (mostly) fixed in Perl 5.004.
2572 However, the developers of Perl 5.004 could not fix this bug completely,
2573 because at least two widely-used modules depend on the old meaning of
2574 "$$0" in a string. So Perl 5.004 still interprets "$$<digit>" in the
2575 old (broken) way inside strings; but it generates this message as a
2576 warning. And in Perl 5.005, this special treatment will cease.
2578 =item Use of $# is deprecated
2580 (D) This was an ill-advised attempt to emulate a poorly defined B<awk> feature.
2581 Use an explicit printf() or sprintf() instead.
2583 =item Use of $* is deprecated
2585 (D) This variable magically turned on multi-line pattern matching, both for
2586 you and for any luckless subroutine that you happen to call. You should
2587 use the new C<//m> and C<//s> modifiers now to do that without the dangerous
2588 action-at-a-distance effects of C<$*>.
2590 =item Use of %s in printf format not supported
2592 (F) You attempted to use a feature of printf that is accessible from
2593 only C. This usually means there's a better way to do it in Perl.
2595 =item Use of bare E<lt>E<lt> to mean E<lt>E<lt>"" is deprecated
2597 (D) You are now encouraged to use the explicitly quoted form if you
2598 wish to use an empty line as the terminator of the here-document.
2600 =item Use of implicit split to @_ is deprecated
2602 (D) It makes a lot of work for the compiler when you clobber a
2603 subroutine's argument list, so it's better if you assign the results of
2604 a split() explicitly to an array (or list).
2606 =item Use of inherited AUTOLOAD for non-method %s() is deprecated
2608 (D) As an (ahem) accidental feature, C<AUTOLOAD> subroutines are looked
2609 up as methods (using the C<@ISA> hierarchy) even when the subroutines to
2610 be autoloaded were called as plain functions (e.g. C<Foo::bar()>), not
2611 as methods (e.g. C<Foo->bar()> or C<$obj->bar()>).
2613 This bug will be rectified in Perl 5.005, which will use method lookup
2614 only for methods' C<AUTOLOAD>s. However, there is a significant base
2615 of existing code that may be using the old behavior. So, as an
2616 interim step, Perl 5.004 issues an optional warning when non-methods
2617 use inherited C<AUTOLOAD>s.
2619 The simple rule is: Inheritance will not work when autoloading
2620 non-methods. The simple fix for old code is: In any module that used to
2621 depend on inheriting C<AUTOLOAD> for non-methods from a base class named
2622 C<BaseClass>, execute C<*AUTOLOAD = \&BaseClass::AUTOLOAD> during startup.
2624 =item Use of %s is deprecated
2626 (D) The construct indicated is no longer recommended for use, generally
2627 because there's a better way to do it, and also because the old way has
2630 =item Use of uninitialized value
2632 (W) An undefined value was used as if it were already defined. It was
2633 interpreted as a "" or a 0, but maybe it was a mistake. To suppress this
2634 warning assign an initial value to your variables.
2636 =item Useless use of %s in void context
2638 (W) You did something without a side effect in a context that does nothing
2639 with the return value, such as a statement that doesn't return a value
2640 from a block, or the left side of a scalar comma operator. Very often
2641 this points not to stupidity on your part, but a failure of Perl to parse
2642 your program the way you thought it would. For example, you'd get this
2643 if you mixed up your C precedence with Python precedence and said
2647 when you meant to say
2649 ($one, $two) = (1, 2);
2651 Another common error is to use ordinary parentheses to construct a list
2652 reference when you should be using square or curly brackets, for
2657 when you should have said
2661 The square brackets explicitly turn a list value into a scalar value,
2662 while parentheses do not. So when a parenthesized list is evaluated in
2663 a scalar context, the comma is treated like C's comma operator, which
2664 throws away the left argument, which is not what you want. See
2665 L<perlref> for more on this.
2667 =item untie attempted while %d inner references still exist
2669 (W) A copy of the object returned from C<tie> (or C<tied>) was still
2670 valid when C<untie> was called.
2672 =item Value of %s can be "0"; test with defined()
2674 (W) In a conditional expression, you used <HANDLE>, <*> (glob), C<each()>,
2675 or C<readdir()> as a boolean value. Each of these constructs can return a
2676 value of "0"; that would make the conditional expression false, which is
2677 probably not what you intended. When using these constructs in conditional
2678 expressions, test their values with the C<defined> operator.
2680 =item Variable "%s" is not imported%s
2682 (F) While "use strict" in effect, you referred to a global variable
2683 that you apparently thought was imported from another module, because
2684 something else of the same name (usually a subroutine) is exported
2685 by that module. It usually means you put the wrong funny character
2686 on the front of your variable.
2688 =item Variable "%s" may be unavailable
2690 (W) An inner (nested) I<anonymous> subroutine is inside a I<named>
2691 subroutine, and outside that is another subroutine; and the anonymous
2692 (innermost) subroutine is referencing a lexical variable defined in
2693 the outermost subroutine. For example:
2695 sub outermost { my $a; sub middle { sub { $a } } }
2697 If the anonymous subroutine is called or referenced (directly or
2698 indirectly) from the outermost subroutine, it will share the variable
2699 as you would expect. But if the anonymous subroutine is called or
2700 referenced when the outermost subroutine is not active, it will see
2701 the value of the shared variable as it was before and during the
2702 *first* call to the outermost subroutine, which is probably not what
2705 In these circumstances, it is usually best to make the middle
2706 subroutine anonymous, using the C<sub {}> syntax. Perl has specific
2707 support for shared variables in nested anonymous subroutines; a named
2708 subroutine in between interferes with this feature.
2710 =item Variable "%s" will not stay shared
2712 (W) An inner (nested) I<named> subroutine is referencing a lexical
2713 variable defined in an outer subroutine.
2715 When the inner subroutine is called, it will probably see the value of
2716 the outer subroutine's variable as it was before and during the
2717 *first* call to the outer subroutine; in this case, after the first
2718 call to the outer subroutine is complete, the inner and outer
2719 subroutines will no longer share a common value for the variable. In
2720 other words, the variable will no longer be shared.
2722 Furthermore, if the outer subroutine is anonymous and references a
2723 lexical variable outside itself, then the outer and inner subroutines
2724 will I<never> share the given variable.
2726 This problem can usually be solved by making the inner subroutine
2727 anonymous, using the C<sub {}> syntax. When inner anonymous subs that
2728 reference variables in outer subroutines are called or referenced,
2729 they are automatically rebound to the current values of such
2732 =item Variable syntax
2734 (A) You've accidentally run your script through B<csh> instead
2735 of Perl. Check the #! line, or manually feed your script into
2738 =item Warning: something's wrong
2740 (W) You passed warn() an empty string (the equivalent of C<warn "">) or
2741 you called it with no args and C<$_> was empty.
2743 =item Warning: unable to close filehandle %s properly
2745 (S) The implicit close() done by an open() got an error indication on the
2746 close(). This usually indicates your file system ran out of disk space.
2748 =item Warning: Use of "%s" without parentheses is ambiguous
2750 (S) You wrote a unary operator followed by something that looks like a
2751 binary operator that could also have been interpreted as a term or
2752 unary operator. For instance, if you know that the rand function
2753 has a default argument of 1.0, and you write
2757 you may THINK you wrote the same thing as
2761 but in actual fact, you got
2765 So put in parentheses to say what you really mean.
2767 =item Write on closed filehandle
2769 (W) The filehandle you're writing to got itself closed sometime before now.
2770 Check your logic flow.
2772 =item X outside of string
2774 (F) You had a pack template that specified a relative position before
2775 the beginning of the string being unpacked. See L<perlfunc/pack>.
2777 =item x outside of string
2779 (F) You had a pack template that specified a relative position after
2780 the end of the string being unpacked. See L<perlfunc/pack>.
2782 =item Xsub "%s" called in sort
2784 (F) The use of an external subroutine as a sort comparison is not yet supported.
2786 =item Xsub called in sort
2788 (F) The use of an external subroutine as a sort comparison is not yet supported.
2790 =item You can't use C<-l> on a filehandle
2792 (F) A filehandle represents an opened file, and when you opened the file it
2793 already went past any symlink you are presumably trying to look for.
2794 Use a filename instead.
2796 =item YOU HAVEN'T DISABLED SET-ID SCRIPTS IN THE KERNEL YET!
2798 (F) And you probably never will, because you probably don't have the
2799 sources to your kernel, and your vendor probably doesn't give a rip
2800 about what you want. Your best bet is to use the wrapsuid script in
2801 the eg directory to put a setuid C wrapper around your script.
2803 =item You need to quote "%s"
2805 (W) You assigned a bareword as a signal handler name. Unfortunately, you
2806 already have a subroutine of that name declared, which means that Perl 5
2807 will try to call the subroutine when the assignment is executed, which is
2808 probably not what you want. (If it IS what you want, put an & in front.)
2810 =item [gs]etsockopt() on closed fd
2812 (W) You tried to get or set a socket option on a closed socket.
2813 Did you forget to check the return value of your socket() call?
2814 See L<perlfunc/getsockopt>.
2816 =item \1 better written as $1
2818 (W) Outside of patterns, backreferences live on as variables. The use
2819 of backslashes is grandfathered on the right-hand side of a
2820 substitution, but stylistically it's better to use the variable form
2821 because other Perl programmers will expect it, and it works better
2822 if there are more than 9 backreferences.
2824 =item '|' and 'E<lt>' may not both be specified on command line
2826 (F) An error peculiar to VMS. Perl does its own command line redirection, and
2827 found that STDIN was a pipe, and that you also tried to redirect STDIN using
2828 'E<lt>'. Only one STDIN stream to a customer, please.
2830 =item '|' and 'E<gt>' may not both be specified on command line
2832 (F) An error peculiar to VMS. Perl does its own command line redirection, and
2833 thinks you tried to redirect stdout both to a file and into a pipe to another
2834 command. You need to choose one or the other, though nothing's stopping you
2835 from piping into a program or Perl script which 'splits' output into two
2838 open(OUT,">$ARGV[0]") or die "Can't write to $ARGV[0]: $!";
2845 =item Got an error from DosAllocMem
2847 (P) An error peculiar to OS/2. Most probably you're using an obsolete
2848 version of Perl, and this should not happen anyway.
2850 =item Malformed PERLLIB_PREFIX
2852 (F) An error peculiar to OS/2. PERLLIB_PREFIX should be of the form
2860 with nonempty prefix1 and prefix2. If C<prefix1> is indeed a prefix
2861 of a builtin library search path, prefix2 is substituted. The error
2862 may appear if components are not found, or are too long. See
2863 "PERLLIB_PREFIX" in F<README.os2>.
2865 =item PERL_SH_DIR too long
2867 (F) An error peculiar to OS/2. PERL_SH_DIR is the directory to find the
2868 C<sh>-shell in. See "PERL_SH_DIR" in F<README.os2>.
2870 =item Process terminated by SIG%s
2872 (W) This is a standard message issued by OS/2 applications, while *nix
2873 applications die in silence. It is considered a feature of the OS/2
2874 port. One can easily disable this by appropriate sighandlers, see
2875 L<perlipc/"Signals">. See also "Process terminated by SIGTERM/SIGINT"