From 04f59f9defeeb618260e620bb11466741c0e41e5 Mon Sep 17 00:00:00 2001
From: Dmitry Volyntsev <xeioex@nginx.com>
Date: Wed, 1 Jun 2022 21:54:32 -0700
Subject: [PATCH] Fixed function value initialization.

This closes #470 issue on Github.
---
 src/njs_vmcode.c         | 4 ++--
 src/test/njs_unit_test.c | 6 ++++--
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/src/njs_vmcode.c b/src/njs_vmcode.c
index ae1d1bb4..9833ada0 100644
--- a/src/njs_vmcode.c
+++ b/src/njs_vmcode.c
@@ -1259,9 +1259,9 @@ njs_vmcode_function_copy(njs_vm_t *vm, njs_value_t *value, njs_index_t retidx)
     njs_value_t     *retval;
     njs_function_t  *function;
 
-    retval = njs_scope_valid_value(vm, retidx);
+    retval = njs_scope_value(vm, retidx);
 
-    if (njs_is_undefined(retval)) {
+    if (!njs_is_valid(retval)) {
         *retval = *value;
 
         function = njs_function_value_copy(vm, retval);
diff --git a/src/test/njs_unit_test.c b/src/test/njs_unit_test.c
index 502e3fb8..958b0049 100644
--- a/src/test/njs_unit_test.c
+++ b/src/test/njs_unit_test.c
@@ -10200,10 +10200,12 @@ static njs_unit_test_t  njs_test[] =
                  "c()()()"),
       njs_str("1") },
 
-#if 0
     { njs_str("function f() {}; f += 1; f"),
       njs_str("[object Function]1") },
-#endif
+
+    { njs_str("function f() { function g() { g = undefined; }; g(); g(); };"
+              "f()"),
+      njs_str("TypeError: undefined is not a function") },
 
     { njs_str("function f() {}; function g() { return f }; g()"),
       njs_str("[object Function]") },
-- 
2.47.3