Rework of evaluation variable handling, to account for functions having branching variable states

tests/integration/Functions.cpp

@@ -104,4 +104,33 @@ TEST_CASE( "Functions can call themselves", "[integration]" ) {
     delete script;
 }
 
+TEST_CASE( "Functions respect scope", "[integration]" ) {
+    Script* script = Script::Create(
+R"(
+function test()
+    function foo()
+       local a = 10
+    end
+    if true then
+       if true then
+           local a = 50
+           foo()
+           result = a
+       end
+    end
+end
+test()
+)"
+    );
+    REQUIRE(!script->Diagnostics -> HasErrors());
+    script->Evaluate();
+
+    auto variable = script->GetVariable("result");
+    REQUIRE(variable->GetType()->GetClass() == TypeClass::Number);
+    REQUIRE(variable->EvaluateInteger() == 50);
+
+    delete script;
+}
+
+
 #endif