init init_awhileexpr (
		n_kwwhile: nullable TKwwhile,
		n_expr: nullable AExpr,
		n_kwdo: nullable TKwdo,
		n_block: nullable AExpr,
		n_label: nullable ALabel
	)
	do
		_n_kwwhile = n_kwwhile.as(not null)
		n_kwwhile.parent = self
		_n_expr = n_expr.as(not null)
		n_expr.parent = self
		_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