golang main 代码
文件路径：/test/typeparam/issue47892b.dir/main.go
/ Copyright 2021 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
import "./a"
type S[Idx any] struct {
A string
B Idx
}
type O[Idx any] struct {
A int
B a.I[Idx]
}