treewide: rework function scoping

 - Implement proper closure scoping for function
 - Avoid circular references when managing scopes pointers
 - Eliminate ut_putval() in favor to json_object_put()
 - Fix function return value handling
 - Change internal function structure

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

1 files changed, 35 insertions, 0 deletions

diff --git a/tests/02_runtime/05_closure_scope b/tests/02_runtime/05_closure_scope
new file mode 100644
index 0000000..40f9245
--- /dev/null
+++ b/tests/02_runtime/05_closure_scope
@@ -0,0 +1,35 @@
+Testing closure scopes.
+
+
+1. Ensure that the declaring scope is retained in functions.
+
+-- Expect stdout --
+Make function with x=1
+Make function with x=2
+Make function with x=3
+x is 1
+x is 2
+x is 3
+-- End --
+
+-- Testcase --
+{%
+	local count=0;
+
+	function a() {
+		local x = ++count;
+		print("Make function with x=", x, "\n");
+		return function() {
+			print("x is ", x, "\n");
+		};
+	}
+
+	local fn1 = a();
+	local fn2 = a();
+	local fn3 = a();
+
+	fn1();
+	fn2();
+	fn3();
+%}
+-- End --