cmd/yacc: fix compile error in empty grammar

Fixes #12154.

Change-Id: I1e6d1a3479a8a6fc8f53aebd18fb142506110809
Reviewed-on: https://go-review.googlesource.com/13673
Reviewed-by: Rob Pike <r@golang.org>

diff --git a/src/cmd/yacc/yacc.go b/src/cmd/yacc/yacc.go
index a63c218b136f90c722d31679d1d5384fc6c9093b..4f83f50e4606aafe939c5cec3aa8186236b2b7bd 100644 (file)
--- a/src/cmd/yacc/yacc.go
+++ b/src/cmd/yacc/yacc.go
@@ -3473,6 +3473,7 @@ func ($$rcvr *$$ParserImpl) Parse($$lex $$Lexer) int {
        var $$lval $$SymType
        var $$VAL $$SymType
        var $$Dollar []$$SymType
+       _ = $$Dollar // silence set and not used
        $$S := make([]$$SymType, $$MaxDepth)
 
        Nerrs := 0   /* number of errors */