| // 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. |
| |
| package main |
| |
| import "runtime" |
| |
| type T [4]int |
| |
| //go:noinline |
| func g(x []*T) ([]*T, []*T) { return x, x } |
| |
| func main() { |
| const Jenny = 8675309 |
| s := [10]*T{{Jenny}} |
| |
| done := make(chan struct{}) |
| runtime.SetFinalizer(s[0], func(p *T) { close(done) }) |
| |
| var h, _ interface{} = g(s[:]) |
| |
| if wait(done) { |
| panic("GC'd early") |
| } |
| |
| if h.([]*T)[0][0] != Jenny { |
| panic("lost Jenny's number") |
| } |
| |
| if !wait(done) { |
| panic("never GC'd") |
| } |
| } |
| |
| func wait(done <-chan struct{}) bool { |
| for i := 0; i < 10; i++ { |
| runtime.GC() |
| select { |
| case <-done: |
| return true |
| default: |
| } |
| } |
| return false |
| } |
