Document new overload warning in overload.pm

as well as perldiag.

diff --git a/lib/overload.pm b/lib/overload.pm
index f107d83..eb39c94 100644 (file)
--- a/lib/overload.pm
+++ b/lib/overload.pm
@@ -1604,6 +1604,11 @@ The arguments should come in pairs.
 to be a code reference. Either an anonymous subroutine, or a reference
 to a subroutine.
 
+=item overload arg '%s' is invalid
+
+(W) C<use overload> was passed an argument it did not
+recognize.  Did you mistype an operator?
+
 =back
 
 =head1 BUGS AND PITFALLS