1// run
2
3// Copyright 2020 The Go Authors. All rights reserved.
4// Use of this source code is governed by a BSD-style
5// license that can be found in the LICENSE file.
6
7package main
8
9import "reflect"
10
11// complicated enough to require a compile-generated hash function
12type K struct {
13	a, b int32 // these get merged by the compiler into a single field, something typehash doesn't do
14	c    float64
15}
16
17func main() {
18	k := K{a: 1, b: 2, c: 3}
19
20	// Make a reflect map.
21	m := reflect.MakeMap(reflect.MapOf(reflect.TypeOf(K{}), reflect.TypeOf(true)))
22	m.SetMapIndex(reflect.ValueOf(k), reflect.ValueOf(true))
23
24	// The binary must not contain the type map[K]bool anywhere, or reflect.MapOf
25	// will use that type instead of making a new one. So use an equivalent named type.
26	type M map[K]bool
27	var x M
28	reflect.ValueOf(&x).Elem().Set(m)
29	if !x[k] {
30		panic("key not found")
31	}
32}
33