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// run
// Copyright 2022 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 "runtime"
func main() {
if wait() {
panic("GC'd early")
}
m = nil
if !wait() {
panic("never GC'd")
}
}
var m = New[int]().M
func New[X any]() *T[X] {
p := new(T[X])
runtime.SetFinalizer(p, func(*T[X]) { close(done) })
return p
}
type T[X any] [4]int // N.B., [4]int avoids runtime's tiny object allocator
func (*T[X]) M() {}
var done = make(chan int)
func wait() bool {
for i := 0; i < 10; i++ {
runtime.GC()
select {
case <-done:
return true
default:
}
}
return false
}
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