Add 'engine/' from commit 'a8e37fc010'

git-subtree-dir: engine
git-subtree-mainline: b74841629e
git-subtree-split: a8e37fc010

engine/modules/gdscript/tests/scripts/parser/features/lambda_callable.gd

@@ -0,0 +1,4 @@
+func test():
+	var my_lambda = func(x):
+		print(x)
+	my_lambda.call("hello")