Super Calls

[Mercerenies]

Calling superclass methods. I might suggest the literal word super being reserved for this purpose

(super:foo)

Constructors will need to be special-cased, as the constructor super call must appear first (like in Java). We don't even handle constructor super calls in the gdscript syntax tree right now, so that will need to be implemented too.

[Mercerenies]

Constructor super calls which appear at the beginning of the constructor have already been handled, as per acf44c2. That leaves a handful of cases left to consider.

• Super calls in any other position in the constructor should be an explicit error.
• Super calls directly inside (read: not in a closure) a class method should simply call the supermethod using the GDScript default syntax.
• Super calls inside a closure in a class method will need to delegate to a specialized instance method that we synthesize for this purpose.

As an example of the last case, the following code

(defclass Foo ()
  (defn foo () (lambda () (super)))

should compile to something like (simplifying the lambda expansion for the purposes of brevity)

class Lambda:
    var _self
    func _init(_self):
        self._self = _self
    func call_func():
        self._self._super_foo()

class Foo(Reference):
    func foo():
        return Lambda.new(self)
    func _super_foo():
        return .foo()

[Mercerenies]

Implemented fully as of 4baee4e.