PK!çìAŽQQa.gonu„[µü¤// Copyright 2019 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 a import ( "errors" "strings" ) var G interface{} func Unmarshal(data []byte, o interface{}) error { G = o v, ok := o.(*map[string]interface{}) if !ok { return errors.New("eek") } vals := make(map[string]interface{}) s := string(data) items := strings.Split(s, " ") var err error for _, item := range items { vals[item] = s if item == "error" { err = errors.New("ouch") } } *v = vals return err } PK!'ˆ†Ï‰‰m.gonu„[µü¤// Copyright 2019 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 ( "os" "./b" ) func main() { seed := "some things are better" bsl := []byte(seed) b.CallReadValues("/dev/null") vals, err := b.ReadValues(bsl) if vals["better"] != seed || err != nil { os.Exit(1) } } PK!î¨B†llb.gonu„[µü¤// Copyright 2019 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 b import ( "io/ioutil" "./a" ) var G int // An inlinable function. To trigger the bug in question this needs // to be inlined here within the package and also inlined into some // other package that imports it. func ReadValues(data []byte) (vals map[string]interface{}, err error) { err = a.Unmarshal(data, &vals) if len(vals) == 0 { vals = map[string]interface{}{} } return } // A local call to the function above, which triggers the "move to heap" // of the output param. func CallReadValues(filename string) (map[string]interface{}, error) { defer func() { G++ }() data, err := ioutil.ReadFile(filename) if err != nil { return map[string]interface{}{}, err } return ReadValues(data) } PK!çìAŽQQa.gonu„[µü¤PK!'ˆ†Ï‰‰…m.gonu„[µü¤PK!î¨B†llBb.gonu„[µü¤PKÌâ