diff --git a/expr_test.go b/expr_test.go
index da758fc..cc7c912 100644
--- a/expr_test.go
+++ b/expr_test.go
@@ -24,11 +24,11 @@ func TestExpr(t *testing.T) {
 	succeeded := 0
 	failed := 0
 
-	// inputs1 := []inputType{
-	// 	{`1 ? {"a"} : {"b"} ? ["a"] {"A"} :["b"] {"B"}`, "B", nil},
-	// }
+	inputs1 := []inputType{
+		{`f = func(op){op()}; f(func(){2})`, int64(2), nil},
+	}
 
-	for i, input := range inputs {
+	for i, input := range inputs1 {
 		var expr Expr
 		var gotResult any
 		var gotErr error
diff --git a/operand-func.go b/operand-func.go
index 7e1ba8a..cb489de 100644
--- a/operand-func.go
+++ b/operand-func.go
@@ -89,7 +89,12 @@ type funcDefFunctor struct {
 func (functor *funcDefFunctor) Invoke(ctx ExprContext, name string, args []any) (result any, err error) {
 	for i, p := range functor.params {
 		if i < len(args) {
-			ctx.setVar(p, args[i])
+			arg := args[i]
+			if functor, ok := arg.(Functor); ok {
+				ctx.RegisterFunc(p, functor, 0, -1)
+			} else {
+				ctx.setVar(p, arg)
+			}
 		} else {
 			ctx.setVar(p, nil)
 		}