Closed
Description
This can probably be reduced further, but the following works. The example below shows the value changing to 0, but I've observed it being filled with other garbage values as well.
I'm guessing the value is being incorrectly GCd.
package p
func Int32(i int32) *int32 {
return &i
}package p_test
import (
"fmt"
"testing"
"p"
)
type I interface {
Add(out *P)
}
type P struct {
V *int32
}
type T struct{}
func (T) Add(out *P) {
out.V = p.Int32(42)
}
func F(s I) interface{} {
out := &P{}
s.Add(out)
return out
}
func TestP(t *testing.T) {
var s T
resp := F(s).(*P)
fmt.Sprint(new(int32)) // this line is necessary
if got, want := *resp.V, int32(42); got != want {
t.Errorf("got %v, want %v", got, want)
}
}$ go version
go version go1.4.2 linux/amd64
$ go test
PASS
$ go version
go version devel +1e48683 Wed Jun 3 22:28:06 2015 +0000 linux/amd64
$ /tmp/g/bin/go test
--- FAIL: TestP (0.00s)
p_test.go:35: got 0, want 42
FAIL