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// run
// Copyright 2017 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/debug"
type T struct {
// >= 16 bytes to avoid tiny alloc.
a, b int
}
func main() {
debug.SetGCPercent(1)
for i := 0; i < 100000; i++ {
m := make(map[*T]struct{}, 0)
for j := 0; j < 20; j++ {
// During the call to mapassign_fast64, the key argument
// was incorrectly treated as a uint64. If the stack was
// scanned during that call, the only pointer to k was
// missed, leading to *k being collected prematurely.
k := new(T)
m[k] = struct{}{}
}
}
}
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