Failure of user callbacks dispatched using the C<G_KEEPERR> flag could
also result in this warning. See L<perlcall/G_KEEPERR>.
+=item Incomplete expression within '(?[ ])' in regex; marked by <-- HERE in m/%s/
+
+(F)
+There was a syntax error within the C<(?[ ])>. This can happen if the
+expression inside the construct was completely empty, or if there are
+too many or few operands for the number of operators. Perl is not smart
+enough to give you a more precise indication as to what is wrong.
+
=item Inconsistent hierarchy during C3 merge of class '%s': merging failed on
parent '%s'
/\N {SPACE}/x; # Wrong!
/\N{SPACE}/x; # ok
+=item Need exactly 3 octal digits in regex; marked by <-- HERE in m/%s/
+
+(F) Within S<C<(?[ ])>>, all constants interpreted as octal need to be
+exactly 3 digits long. This helps catch some ambiguities. If your
+constant is too short, add leading zeros, like
+
+ (?[ [ \078 ] ]) # Syntax error!
+ (?[ [ \0078 ] ]) # Works
+ (?[ [ \007 8 ] ]) # Clearer
+
+The maximum number this construct can express is C<\777>. If you
+need a larger one, you need to use L<\o{}|perlrebackslash/Octal escapes>
+instead. If you meant two separate things, you need to separate them
+
+ (?[ [ \7776 ] ]) # Syntax error!
+ (?[ [ \o{7776} ] ]) # One meaning
+ (?[ [ \777 6 ] ]) # Another meaning
+ (?[ [ \777 \006 ] ]) # Still another
+
=item Negative '/' count in unpack
(F) The length count obtained from a length/code unpack operation was
F<SYS$TIMEZONE_DIFFERENTIAL> to translate to the number of seconds which
need to be added to UTC to get local time.
+=item Non-hex character in regex; marked by <-- HERE in m/%s/
+
+(F)
+In a regular expression, there was a non-hexadecimal character where
+a hex one was expected, like
+
+ (?[ [ \xDG ] ])
+ (?[ [ \x{DEKA} ] ])
+
=item Non-octal character '%c'. Resolved as "%s"
(W digit) In parsing an octal numeric constant, a character was
unexpectedly encountered that isn't octal. The resulting value
is as indicated.
+=item Non-octal character in regex; marked by <-- HERE in m/%s/
+
+(F)
+In a regular expression, there was a non-octal character where
+an octal one was expected, like
+
+ (?[ [ \o{1278} ] ])
+
=item Non-string passed as bitmask
(W misc) A number has been passed as a bitmask argument to select().
Use the vec() function to construct the file descriptor bitmasks for
select. See L<perlfunc/select>.
+=item (?[...]) not valid in locale in regex; marked by <-- HERE in m/%s/
+
+(F)
+C<(?[...])> cannot be used within the scope of a C<S<use locale>> or
+with an C</l> regular expression modifier, as that would require
+deferring to run-time the calculation of what it should evaluate to, and
+it is regex compile-time only.
+
=item Null filename used
(F) You can't require the null filename, especially because on many
Although legal, this idiom might render your code confusing
and is deprecated.
+=item Operand with no preceding operator in regex; marked by <-- HERE in m/%s/
+
+(F)
+You wrote something like
+
+ (?[ \p{Digit} \p{Thai} ])
+
+There are two operands, but no operator giving how you want to combine
+them.
+
=item Operation "%s": no method found, %s
(F) An attempt was made to perform an overloaded operation for which no
L<perlipc/"Signals">. See also "Process terminated by SIGTERM/SIGINT"
in L<perlos2>.
+=item Property '%s' is unknown in regex; marked by <-- HERE in m/%s/
+
+(F)
+The named property which you specified via C<\p> or C<\P> is not one
+known to Perl. Perhaps you misspelled the name? See
+L<perluniprops/Properties accessible through \p{} and \P{}>
+for a complete list of available official properties. If it is a
+L<user-defined property|perlunicode/User-Defined Character Properties>
+it must have been defined by the time the regular expression is
+compiled.
+
=item Prototype after '%c' for %s : %s
(W illegalproto) A character follows % or @ in a prototype. This is
(W unopened) You tried to read from a filehandle that was never opened.
+=item Syntax error in (?[...]) in regex m/%s/
+
+(F)
+Perl could not figure out what you meant inside this construct; this
+notifies you that it is giving up trying.
+
=item System V %s is not implemented on this machine
(F) You tried to do something with a function beginning with "sem",
use feature "lexical_subs";
my sub foo { ... }
+=item The regex_sets feature is experimental
+
+(S experimental::regex_sets) This warning is emitted if you
+use the syntax S<C<(?[ ])>> in a regular expression.
+The details of this feature are subject to change.
+if you want to use it, but know that in doing so you
+are taking the risk of using an experimental feature which may
+change in a future Perl version, you can do this to silence the
+warning:
+
+ no warnings "experimental::regex_sets";
+
=item The %s function is unimplemented
(F) The function indicated isn't implemented on this architecture, according
(F) The unexec() routine failed for some reason. See your local FSF
representative, who probably put it there in the first place.
+=item Unexpected '(' with no preceding operator in regex; marked by <-- HERE in m/%s/
+
+(F)
+You had something like this:
+
+ (?[ \p{Digit} ( \p{Lao} + \p{Thai} ) ])
+
+There should be an operator before the C<"(">, as there's no indication
+as to how the digits are to be combined with the characters in the Lao
+and Thai scripts.
+
+=item Unexpected ')' in regex; marked by <-- HERE in m/%s/
+
+(F)
+You had something like this:
+
+ (?[ ( \p{Digit} + ) ])
+
+The C<")"> is out-of-place. Something apparently was supposed to be
+combined with the digits, or the C<"+"> shouldn't be there, or something
+like that. Perl can't figure out what was intended.
+
+=item Unexpected binary operator '%c' with no preceding operand in regex; marked by <-- HERE in m/%s/
+
+(F)
+You had something like this:
+
+ (?[ | \p{Digit} ])
+
+where the C<"|"> is a binary operator with an operand on the right, but
+no operand on the left.
+
+=item Unexpected character in regex; marked by <-- HERE in m/%s/
+
+(F)
+You had something like this:
+
+ (?[ z ])
+
+Within C<(?[ ])>, no literal characters are allowed unless they are
+within an inner pair of square brackets, like
+
+ (?[ [ z ] ])
+
+Another possibility is that you forgot a backslash. Perl isn't smart
+enough to figure out what you really meant.
+
=item Unexpected constant lvalue entersub entry via type/targ %d:%d
(P) When compiling a subroutine call in lvalue context, Perl failed an
module (e.g. C<use warnings 'File::Find'>), you must have loaded this
module first.
+=item Unmatched '%c' in POSIX class in regex; marked by <-- HERE in m/%s/
+
+You had something like this:
+
+ (?[ [:alnum] ])
+
+There should be a second C<":">, like this:
+
+ (?[ [:alnum:] ])
+
=item Unmatched [ in regex; marked by <-- HERE in m/%s/
(F) The brackets around a character class must match. If you wish to
first. The <-- HERE shows whereabouts in the regular expression the
problem was discovered. See L<perlre>.
+=item Unmatched '[' in POSIX class in regex; marked by <-- HERE in m/%s/
+
+(F)
+You had something like this:
+
+ (?[ [:digit: ])
+
+That should be written:
+
+ (?[ [:digit:] ])
+
=item Unmatched ( in regex; marked by <-- HERE in m/%s/
=item Unmatched ) in regex; marked by <-- HERE in m/%s/
in your Perl script (or eval) near the specified column. Perhaps you tried
to run a compressed script, a binary program, or a directory as a Perl program.
+=item Unrecognized escape \%c in character class in regex; marked by <-- HERE in m/%s/
+
+(F)
+You used a backslash-character combination which is not recognized by
+Perl inside character classes. This is a fatal error when the character
+class is used within C<(?[ ])>.
+
=item Unrecognized escape \%c in character class passed through in regex;
marked by <-- HERE in m/%s/
You probably meant to use C<$]> instead. C<$[> is the base for indexing
arrays. C<$]> is the Perl version number in decimal.
+=item Use \\x{...} for more than two hex characters in regex; marked by <-- HERE in m/%s/
+
+(F)
+In a regular expression, you said something like
+
+ (?[ [ \xBEEF ] ])
+
+Perl isn't sure if you meant this
+
+ (?[ [ \x{BEEF} ] ])
+
+or if you meant this
+
+ (?[ [ \x{BE} E F ] ])
+
+You need to add either braces or blanks to disambiguate.
+
=item Useless assignment to a temporary
(W misc) You assigned to an lvalue subroutine, but what
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