golang plugin 代码
文件路径：/misc/cgo/testplugin/testdata/method/plugin.go
// Copyright 2020 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 main
func main() {}
type T int
func (T) M() { println("M") }
var X T