init init_aascastexpr (
		n_expr: nullable AExpr,
		n_kwas: nullable TKwas,
		n_opar: nullable TOpar,
		n_type: nullable AType,
		n_cpar: nullable TCpar
	)
	do
		_n_expr = n_expr.as(not null)
		n_expr.parent = self
		_n_kwas = n_kwas.as(not null)
		n_kwas.parent = self
		_n_opar = n_opar
		if n_opar != null then n_opar.parent = self
		_n_type = n_type.as(not null)
		n_type.parent = self
		_n_cpar = n_cpar
		if n_cpar != null then n_cpar.parent = self
	end