init init_aforexpr (
		n_kwfor: nullable TKwfor,
		n_groups: Collection[Object], # Should be Collection[AForGroup]
		n_kwdo: nullable TKwdo,
		n_block: nullable AExpr,
		n_label: nullable ALabel
	)
	do
		_n_kwfor = n_kwfor.as(not null)
		n_kwfor.parent = self
		self.n_groups.unsafe_add_all(n_groups)
		_n_kwdo = n_kwdo.as(not null)
		n_kwdo.parent = self
		_n_block = n_block
		if n_block != null then n_block.parent = self
		_n_label = n_label
		if n_label != null then n_label.parent = self
	end