// compile // Copyright 2019 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. package p var ( x int xs []int ) func a([]int) (int, error) func b() (int, error) { return a(append(xs, x)) } func c(int, error) (int, error) func d() (int, error) { return c(b()) }