init init_avarreassignexpr (
		n_id: nullable TId,
		n_assign_op: nullable AAssignOp,
		n_value: nullable AExpr
	)
	do
		_n_id = n_id.as(not null)
		n_id.parent = self
		_n_assign_op = n_assign_op.as(not null)
		n_assign_op.parent = self
		_n_value = n_value.as(not null)
		n_value.parent = self
	end