golang issue15920 代码
文件路径：/src/cmd/compile/internal/importer/testdata/issue15920.go
// Copyright 2016 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
// The underlying type of Error is the underlying type of error.
// Make sure we can import this again without problems.
type Error error
func F() Error { return nil }