perldiag: Add missing variant of proto warning

This is already listed, but without the ‘after '_'’ bit, so splain
couldn’t find it.

diff --git a/pod/perldiag.pod b/pod/perldiag.pod
index 51a19e7d1c6fc586f8d6a1440f11ccec75b58c70..483d164f496f42a4caa4d21d8c03117d93b4ac63 100644 (file)
--- a/pod/perldiag.pod
+++ b/pod/perldiag.pod
@@ -2042,6 +2042,11 @@ been used, and the correct charname handler is in scope.
 binary number.  Interpretation of the binary number stopped before the
 offending digit.
 
+=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 +.
+
 =item Illegal character \%o (carriage return)
 
 (F) Perl normally treats carriage returns in the program text as it