init init_aifexpr (
		n_kwif: nullable TKwif,
		n_expr: nullable AExpr,
		n_kwthen: nullable TKwthen,
		n_then: nullable AExpr,
		n_kwelse: nullable TKwelse,
		n_else: nullable AExpr
	)
	do
		_n_kwif = n_kwif.as(not null)
		n_kwif.parent = self
		_n_expr = n_expr.as(not null)
		n_expr.parent = self
		_n_kwthen = n_kwthen.as(not null)
		n_kwthen.parent = self
		_n_then = n_then
		if n_then != null then n_then.parent = self
		_n_kwelse = n_kwelse
		if n_kwelse != null then n_kwelse.parent = self
		_n_else = n_else
		if n_else != null then n_else.parent = self
	end