Prototypes without argument names causes "Duplicate local variable ''".
Imported from http://bugzilla.roxen.com/bugzilla/show_bug.cgi?id=202
Reported by @grubba
Pike v7.1 release 6 running Hilfe v2.0 (Incremental Pike Frontend)
> class { void foo(int, string); };
-:1:Duplicate local variable '', previous declaration on line 1
-:1:Class definition failed.
See also lyskom://kom.idonex.se/216307/.