(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
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
(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
$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
(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
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
(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/
(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
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