func (check *Checker) isBrokenAlias(alias *TypeName) bool {
	assert(!check.conf._EnableAlias)
	return check.brokenAliases[alias]
}

func (check *Checker) rememberUntyped(e ast.Expr, lhs bool, mode operandMode, typ *Basic, val constant.Value) {
	m := check.untyped
	if m == nil {
		m = make(map[ast.Expr]exprInfo)
		check.untyped = m
	}
	m[e] = exprInfo{lhs, mode, typ, val}
}

func (check *Checker) isBrokenAlias(alias *TypeName) bool {
	assert(!check.conf.EnableAlias)
	return check.brokenAliases[alias]
}

func (check *Checker) rememberUntyped(e syntax.Expr, lhs bool, mode operandMode, typ *Basic, val constant.Value) {
	m := check.untyped
	if m == nil {
		m = make(map[syntax.Expr]exprInfo)
		check.untyped = m
	}
	m[e] = exprInfo{lhs, mode, typ, val}