(A) An alien error message (not generated by Perl).
The majority of messages from the first three classifications above
-(W, D & S) can be controlled using the C<warnings> pragma.
+(W, D & S) can be controlled using the C<warnings> pragma.
If a message can be controlled by the C<warnings> pragma, its warning
category is included with the classification letter in the description
(W closed) You tried to do a bind on a closed socket. Did you forget to
check the return value of your socket() call? See L<perlfunc/bind>.
+=item binmode() on closed filehandle %s
+
+(W unopened) You tried binmode() on a filehandle that was never opened.
+Check you control flow and number of arguments.
+
=item Bit vector size > 32 non-portable
(W portable) Using bit vector sizes larger than 32 is non-portable.
unseen whitespace before or after your closing tag. A good programmer's
editor will have a way to help you find these characters.
-=item Can't find %s property definition %s
+=item Can't find %s property definition %s
(F) You may have tried to use C<\p> which means a Unicode property for
example \p{Lu} is all uppercase letters. Escape the C<\p>, either
(F) You said something like C<local $$ref>, which Perl can't currently
handle, because when it goes to restore the old value of whatever $ref
pointed to after the scope of the local() is finished, it can't be sure
-that $ref will still be a reference.
+that $ref will still be a reference.
=item Can't locate %s
though, because the inner curlies will be considered a block that
loops once. See L<perlfunc/redo>.
-=item Can't remove %s: %s, skipping file
+=item Can't remove %s: %s, skipping file
(S inplace) You requested an inplace edit without creating a backup
file. Perl was unable to remove the original file to replace it with
temporary or readonly values) from a subroutine used as an lvalue. This
is not allowed.
+=item Can't return %s to lvalue scalar context
+
+(F) You tried to return a complete array or hash from an lvalue subroutine,
+but you called the subroutine in a way that made Perl think you meant
+to return only one value. You probably meant to write parentheses around
+the call to the subroutine, which tell Perl that the call should be in
+list context.
+
=item Can't return outside a subroutine
(F) The return statement was executed in mainline code, that is, where
=item Copy method did not return a reference
-(F) The method which overloads "=" is buggy. See
+(F) The method which overloads "=" is buggy. See
L<overload/Copy Constructor>.
=item CORE::%s is not a keyword
(D deprecated) defined() is not usually useful on arrays because it
checks for an undefined I<scalar> value. If you want to see if the
-array is empty, just use C<if (@array) { # not empty }> for example.
+array is empty, just use C<if (@array) { # not empty }> for example.
=item defined(%hash) is deprecated
(D deprecated) defined() is not usually useful on hashes because it
checks for an undefined I<scalar> value. If you want to see if the hash
-is empty, just use C<if (%hash) { # not empty }> for example.
+is empty, just use C<if (%hash) { # not empty }> for example.
=item Delimiter for here document is too long
=item flock() on closed filehandle %s
(W closed) The filehandle you're attempting to flock() got itself closed
-some time before now. Check your logic flow. flock() operates on
+some time before now. Check your control flow. flock() operates on
filehandles. Are you attempting to call flock() on a dirhandle by the
same name?
(W syntax) You've run afoul of the rule that says that any list operator
followed by parentheses turns into a function, with all the list
-operators arguments found inside the parentheses. See
+operators arguments found inside the parentheses. See
L<perlop/Terms and List Operators (Leftward)>.
=item Invalid %s attribute: %s
(F) Your machine apparently doesn't implement ioctl(), which is pretty
strange for a machine that supports C.
+=item ioctl() on unopened %s
+
+(W unopened) You tried ioctl() on a filehandle that was never opened.
+Check you control flow and number of arguments.
+
=item `%s' is not a code reference
(W) The second (fourth, sixth, ...) argument of overload::constant needs
values cannot be returned in subroutines used in lvalue context. See
L<perlsub/"Lvalue subroutines">.
-=item Lookbehind longer than %d not implemented before << HERE in reges m/%s/
+=item Lookbehind longer than %d not implemented before << HERE %s
(F) There is currently a limit on the length of string which lookbehind can
handle. This restriction may be eased in a future release. The << HERE shows in
$x = 1;
foreach my $n ($x, 2) {
$n *= 2; # modifies the $x, but fails on attempt to modify the 2
- }
+ }
=item Modification of non-creatable array value attempted, %s
=item -%s on unopened filehandle %s
(W unopened) You tried to invoke a file test operator on a filehandle
-that isn't open. Check your logic. See also L<perlfunc/-X>.
+that isn't open. Check your control flow. See also L<perlfunc/-X>.
-=item %s() on unopened %s %s
+=item %s() on unopened %s
(W unopened) An I/O operation was attempted on a filehandle that was
never initialized. You need to do an open(), a sysopen(), or a socket()
(P) We popped the context stack to an eval context, and then discovered
it wasn't an eval context.
-=item panic: do_match
+=item panic: pp_match
(P) The internal pp_match() routine was called with invalid operational
data.
-=item panic: do_split
-
-(P) Something terrible went wrong in setting up for the split.
-
=item panic: do_subst
(P) The internal pp_subst() routine was called with invalid operational
data.
-=item panic: do_trans
+=item panic: do_trans_%s
-(P) The internal do_trans() routine was called with invalid operational
+(P) The internal do_trans routines were called with invalid operational
data.
=item panic: frexp
(P) The foreach iterator got called in a non-loop context frame.
+=item panic: pp_split
+
+(P) Something terrible went wrong in setting up for the split.
+
=item panic: realloc
(P) Something requested a negative number of bytes of realloc.
=item panic: utf16_to_utf8: odd bytelen
(P) Something tried to call utf16_to_utf8 with an odd (as opposed
-to even) byte length.
+to even) byte length.
=item Parentheses missing around "%s" list
you run Perl. How to really fix the problem can be found in
L<perllocale> section B<LOCALE PROBLEMS>.
+=item perlio: argument list not closed for layer "%s"
+
+(S) When pushing a layer with arguments onto the Perl I/O system you forgot
+the ) that closes the argument list. (Layers take care of transforming
+data between external and internal representations.) Perl stopped parsing
+the layer list at this point and did not attempt to push this layer.
+If your program didn't explicitly request the failing operation, it may be
+the result of the value of the environment variable PERLIO.
+
+=item perlio: invalid separator character %s in attribute list
+
+(S) When pushing layers onto the Perl I/O system, something other than a
+colon or whitespace was seen between the elements of an layer list.
+If the previous attribute had a parenthesised parameter list, perhaps that
+list was terminated too soon.
+
=item perlio: unknown layer "%s"
(S) An attempt was made to push an unknown layer onto the Perl I/O
=item printf() on closed filehandle %s
(W closed) The filehandle you're writing to got itself closed sometime
-before now. Check your logic flow.
+before now. Check your control flow.
=item print() on closed filehandle %s
(W closed) The filehandle you're printing on got itself closed sometime
-before now. Check your logic flow.
+before now. Check your control flow.
=item Process terminated by SIG%s
{min,max} construct. The << HERE shows in the regular expression about where
the problem was discovered. See L<perlre>.
-=item Quantifier unexpected on zero-length expression before << HERE in regex m/%s/
+=item Quantifier unexpected on zero-length expression before << HERE %s
(W regexp) You applied a regular expression quantifier in a place where
it makes no sense, such as on a zero-width assertion. Try putting the
=item readline() on closed filehandle %s
(W closed) The filehandle you're reading from got itself closed sometime
-before now. Check your logic flow.
+before now. Check your control flow.
=item Reallocation too large: %lx
not magically convert between scalars and lists for you. See
L<perlref>.
+=item Scalars leaked: %d
+
+(P) Something went wrong in Perl's internal bookkeeping of scalars:
+not all scalar variables were deallocated by the time Perl exited.
+What this usually indicates is a memory leak, which is of course bad,
+especially if the Perl program is intended to be long-running.
+
=item Script is not setuid/setgid in suidperl
(F) Oddly, the suidperl program was invoked on a script without a setuid
=item send() on closed socket %s
(W closed) The socket you're sending to got itself closed sometime
-before now. Check your logic flow.
+before now. Check your control flow.
=item Sequence (? incomplete before << HERE mark in regex m/%s/
shows in the regular expression about where the problem was discovered. See
L<perlre>.
-=item Sequence (?{...}) not terminated or not {}-balanced in regex m/%s/
+=item Sequence (?{...}) not terminated or not {}-balanced in %s
(F) If the contents of a (?{...}) clause contains braces, they must balance
for Perl to properly detect the end of the clause. See L<perlre>.
-=item Sequence (?%s...) not implemented before << HERE mark in regex m/%s/
+=item Sequence (?%s...) not implemented before << HERE mark in %s
(F) A proposed regular expression extension has the character reserved but
has not yet been written. The << HERE shows in the regular expression about
where the problem was discovered. See L<perlre>.
-=item Sequence (?%s...) not recognized before << HERE mark in regex m/%s/
+=item Sequence (?%s...) not recognized before << HERE mark in %s
(F) You used a regular expression extension that doesn't make sense.
The << HERE shows in the regular expression about
-where the problem was discovered.
+where the problem was discovered.
See L<perlre>.
=item Sequence (?#... not terminated in regex m/%s/
(F) Your Perl was compiled with B<-D>SETUID_SCRIPTS_ARE_SECURE_NOW, but
a version of the setuid emulator somehow got run anyway.
-=item Switch (?(condition)... contains too many branches before << HERE in regex m/%s/
+=item Switch (?(condition)... contains too many branches before << HE%s
(F) A (?(condition)if-clause|else-clause) construct can have at most two
branches (the if-clause and the else-clause). If you want one or both to
=item syswrite() on closed filehandle %s
(W closed) The filehandle you're writing to got itself closed sometime
-before now. Check your logic flow.
+before now. Check your control flow.
=item Target of goto is too deeply nested
(W newline) A file operation was attempted on a filename, and that
operation failed, PROBABLY because the filename contained a newline,
-PROBABLY because you forgot to chop() or chomp() it off. See
-L<perlfunc/chomp>.
+PROBABLY because you forgot to chomp() it off. See L<perlfunc/chomp>.
=item Unsupported directory function "%s" called
(D deprecated) This was an ill-advised attempt to emulate a poorly
defined B<awk> feature. Use an explicit printf() or sprintf() instead.
+=item Use of reference "%s" in array index
+
+(W) You tried to use a reference as an array index; this probably
+isn't what you mean, because references tend to be huge numbers which
+take you out of memory, and so usually indicates programmer error.
+
+If you really do mean it, explicitly numify your reference, like so:
+C<$array[0+$ref]>
+
=item Use of reserved word "%s" is deprecated
(D deprecated) The indicated bareword is a reserved word. Future
reference variables in outer subroutines are called or referenced, they
are automatically rebound to the current values of such variables.
-=item Variable length lookbehind not implemented before << HERE in regex m/%s/
+=item Variable length lookbehind not implemented before << HERE in %s
(F) Lookbehind is allowed only for subexpressions whose length is fixed and
known at compile time. The << HERE shows in the regular expression about where
=item write() on closed filehandle %s
(W closed) The filehandle you're writing to got itself closed sometime
-before now. Check your logic flow.
+before now. Check your control flow.
=item X outside of string