member ctx removed from struct parser because it is unused

parser.go

@@ -11,13 +11,10 @@ import (
 //-------- parser
 
 type parser struct {
-	ctx ExprContext
 }
 
-func NewParser(ctx ExprContext) (p *parser) {
-	p = &parser{
-		ctx: ctx,
-	}
+func NewParser() (p *parser) {
+	p = &parser{}
 	return p
 }