Jacek Caban (@jacek) commented about dlls/vbscript/parser.y:
Else_opt : /* empty */ { $$ = NULL; }
- | tELSE tNL StatementsNl_opt { $$ = $3; }
- | tELSE StSep_opt StatementsNl_opt { $$ = $3; } | tELSE StatementsNl_opt { $$ = $2; }
This introduces a number of bison warnings. You may fix it by removing, now useless, `tELSE StatementsNl_opt` rule.