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)
        }
}