golang a 代码
文件路径：/test/typeparam/issue48454.dir/a.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 a
import "sync"
type Val[T any] struct {
mu sync.RWMutex
val T
}
func (v *Val[T]) Has() {
v.mu.RLock()
}