-Fixes godot-rust#165.

godot-core/src/builtin/meta/signature.rs

@@ -162,8 +162,9 @@ macro_rules! impl_signature_for_tuple {
 				unsafe { <$R as sys::GodotFuncMarshal>::try_write_sys(&ret_val, ret) }
                     .unwrap_or_else(|e| return_error::<$R>(method_name, &e));
 
-                // FIXME is inc_ref needed here?
-				// std::mem::forget(ret_val);
+               //Note: we want to prevent the destructor from being run, since we pass ownership to the caller.
+               //https://github.com/godot-rust/gdext/pull/165
+				std::mem::forget(ret_val);
             }
         }
     };

itest/godot/InheritTests.gd

@@ -0,0 +1,27 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+extends ArrayTest
+
+var test_suite: TestSuite = TestSuite.new()
+
+# In order to reproduce the bahevaior discovered in https://github.com/godot-rust/gdext/issues/138
+# we must inherit a Godot Node. Because of this we can't just inherit TesSuite like the rest of the tests.
+func assert_that(what: bool, message: String = "") -> bool:
+	return test_suite.assert_that(what, message)
+
+func assert_eq(left, right, message: String = "") -> bool:
+	return test_suite.assert_eq(left, right, message)
+
+# Called when the node enters the scene tree for the first time.
+func _ready():
+	pass
+
+func test_vector_array_return_from_user_func():
+	var array: Array = return_typed_array(2)
+	assert_eq(array, [1,2])
+
+# Called every frame. 'delta' is the elapsed time since the previous frame.
+func _process(delta):
+	pass

itest/godot/TestRunner.gd

@@ -10,6 +10,7 @@ func _ready():
 	var gdscript_suites: Array = [
 		preload("res://ManualFfiTests.gd").new(),
 		preload("res://gen/GenFfiTests.gd").new(),
+		preload("res://InheritTests.gd").new()
 	]
 
 	var gdscript_tests: Array = []