didn't explicitly request the failing operation, it may be the
result of the value of the environment variable PERLIO.
+=item Argument "%s" treated as 0 in increment (++)
+
+(W numeric) The indicated string was fed as an argument to the C<++>
+operator which expects either a number or a string matching
+C</^[a-zA-Z]*[0-9]*\z/>. See L<perlop/Auto-increment and
+Auto-decrement> for details.
+
=item Array @%s missing the @ in argument %d of %s()
(D deprecated) Really old Perl let you omit the @ on array names in some
<-- HERE in m/%s/
(F) Group names must follow the rules for perl identifiers, meaning
-they must start with a non-digit word character. A common cause of
-this error is using (?&0) instead of (?0). See L<perlre>.
+they must start with a non-digit word character. A common cause of
+this error is using (?&0) instead of (?0).
See L<perlre>.
=item ()-group starts with a count
=item Illegal character after '_' in prototype for %s : %s
-(W illegalproto) An illegal character was found in a prototype declaration.
-Legal characters in prototypes are $, @, %, *, ;, [, ], &, \, and +.
+(W illegalproto) An illegal character was found in a prototype
+declaration. The '_' in a prototype must be followed by a ';',
+indicating the rest of the parameters are optional, or one of '@'
+or '%', since those two will accept 0 or more final parameters.
=item Illegal character \%o (carriage return)
(D regexp, deprecated) The two-character sequence C<"(*"> in
this context in a regular expression pattern should be an
indivisible token, with nothing intervening between the C<"(">
-and the C<"*">, but you separated them. Due to an accident of
+and the C<"*">, but you separated them. Due to an accident of
implementation, this prohibition was not enforced, but we do
plan to forbid it in a future Perl version. This message
serves as giving you fair warning of this pending change.
See also L<attributes.pm|attributes>.
+=item Magical list constants are not supported
+
+(F) You assigned a magical array to a stash element, and then tried
+to use the subroutine from the same slot. You are asking Perl to do
+something it cannot do, details subject to change between Perl versions.
+
=item Malformed integer in [] in pack
(F) Between the brackets enclosing a numeric repeat count only digits
are always mentioned with the $ in Perl, unlike in the shells, where it
can vary from one line to the next.
+=item Missing ']' in prototype for %s : %s
+
+(W illegalproto) A grouping was started with C<[> but never closed with
+C<]>.
+
=item (Missing operator before %s?)
(S syntax) This is an educated guess made in conjunction with the message
(W once) Typographical errors often show up as unique variable names.
If you had a good reason for having a unique name, then just mention it
-again somehow to suppress the message. The C<our> declaration is
-provided for this purpose.
+again somehow to suppress the message. The C<our> declaration is provided
+for this purpose.
NOTE: This warning detects symbols that have been used only once so $c, @c,
%c, *c, &c, sub c{}, c(), and c (the filehandle or format) are considered
the same; if a program uses $c only once but also uses any of the others it
-will not trigger this warning.
+will not trigger this warning. Symbols beginning with an underscore and
+symbols using special identifiers (q.v. L<perldata>) are exempt from this
+warning.
=item Need exactly 3 octal digits in regex; marked by <-- HERE in m/%s/
=item Perl folding rules are not up-to-date for 0x%X; please use the perlbug
utility to report; in regex; marked by <-- HERE in m/%s/
-(D regexp, deprecated) You used a regular expression with
-case-insensitive matching, and there is a bug in Perl in which the
-built-in regular expression folding rules are not accurate. This
-may lead to incorrect results. Please report this as a bug using the
-L<perlbug> utility. (This message is marked deprecated, so that it by
-default will be turned-on.)
+(S regexp) You used a regular expression with case-insensitive matching,
+and there is a bug in Perl in which the built-in regular expression
+folding rules are not accurate. This may lead to incorrect results.
+Please report this as a bug using the L<perlbug> utility.
=item Perl_my_%s() not available
(F) Something has attempted to use an internal API call which
depends on Perl being compiled with the default support for randomized hash
-key traversal, but this Perl has been compiled without it. You should
+key traversal, but this Perl has been compiled without it. You should
report this warning to the relevant upstream party, or recompile perl
with default options.
(P) When compiling a subroutine call in lvalue context, Perl failed an
internal consistency check. It encountered a malformed op tree.
+=item Unexpected exit %u
+
+(S) exit() was called or the script otherwise finished gracefully when
+C<PERL_EXIT_WARN> was set in C<PL_exit_flags>.
+
+=item Unexpected exit failure %u
+
+(S) An uncaught die() was called when C<PERL_EXIT_WARN> was set in
+C<PL_exit_flags>.
+
=item Unexpected ')' in regex; marked by <-- HERE in m/%s/
(F) You had something like this:
(F) You specified an unknown Unicode option. See L<perlrun> documentation
of the C<-C> switch for the list of known options.
-=item Unknown Unicode option value %x
+=item Unknown Unicode option value %d
(F) You specified an unknown Unicode option. See L<perlrun> documentation
of the C<-C> switch for the list of known options.
=item Use of each() on hash after insertion without resetting hash iterator results in undefined behavior
-(S internal) The behavior of C<each()> after insertion is undefined; it may
-skip items, or visit items more than once. Consider using C<keys()> instead
-of C<each()>.
+(S internal) The behavior of C<each()> after insertion is undefined;
+it may skip items, or visit items more than once. Consider using
+C<keys()> instead of C<each()>.
=item Use of := for an empty attribute list is not allowed
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