p4raw-id: //depot/perl@18093
construct. Remember that bracketing delimiters count nesting level.
Missing the leading C<$> from a variable C<$m> may cause this error.
-Note that since Perlf 5.9.0 a // can also be the I<defined-or>
+Note that since Perl 5.9.0 a // can also be the I<defined-or>
construct, not just the empty search pattern. Therefore code written
in Perl 5.9.0 or later that uses the // as the I<defined-or> can be
misparsed by pre-5.9.0 Perls as a non-terminated search pattern.