1 files changed, 13 insertions, 0 deletions
diff --git a/expression.go b/expression.go
index 285cac3..9752730 100644
--- a/expression.go
+++ b/expression.go
@@ -323,3 +323,16 @@ type argument struct {
 	value exprExpr
 	next  *argument
 }
+
+type varExpr struct {
+	name string
+	ln   int
+}
+
+func (v *varExpr) markExpr() {}
+
+func (v *varExpr) markExprExpr() {}
+
+func (v *varExpr) markPrimaryExpr() {}
+
+func (v *varExpr) line() int { return v.ln }