2 files changed, 2 insertions, 2 deletions
diff --git a/src/pkg/ebnf/ebnf.go b/src/pkg/ebnf/ebnf.go
index 368a3c812..f71ccc72b 100644
--- a/src/pkg/ebnf/ebnf.go
+++ b/src/pkg/ebnf/ebnf.go
@@ -123,7 +123,7 @@ func (p *Production) Pos() token.Position {
 // Grammar verification
 
 func isLexical(name string) bool {
-	ch, len := utf8.DecodeRuneInString(name);
+	ch, _ := utf8.DecodeRuneInString(name);
 	return !unicode.IsUpper(ch);
 }
 
diff --git a/src/pkg/ebnf/parser.go b/src/pkg/ebnf/parser.go
index 03cc4a756..84afd382a 100644
--- a/src/pkg/ebnf/parser.go
+++ b/src/pkg/ebnf/parser.go
@@ -195,7 +195,7 @@ func (p *parser) parse(filename string, src []byte) Grammar {
 	for p.tok != token.EOF {
 		prod := p.parseProduction();
 		name := prod.Name.String;
-		if prev, found := grammar[name]; !found {
+		if _, found := grammar[name]; !found {
 			grammar[name] = prod;
 		} else {
 			p.Error(prod.Pos(), name + " declared already");