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// run // 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. // Test for declaration and use of a parameterized embedded field. package main import ( "fmt" "sync" ) type MyStruct[T any] struct { val T } type Lockable[T any] struct { MyStruct[T] mu sync.Mutex } // Get returns the value stored in a Lockable. func (l *Lockable[T]) Get() T { l.mu.Lock() defer l.mu.Unlock() return l.MyStruct.val } // Set sets the value in a Lockable. func (l *Lockable[T]) Set(v T) { l.mu.Lock() defer l.mu.Unlock() l.MyStruct = MyStruct[T]{v} } func main() { var li Lockable[int] li.Set(5) if got, want := li.Get(), 5; got != want { panic(fmt.Sprintf("got %d, want %d", got, want)) } }
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