| // run |
| |
| // Copyright 2021 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 ( |
| "fmt" |
| "strconv" |
| ) |
| |
| func test1[T any](fn func(T) int, v T) int { |
| fn1 := func() int { |
| var i interface{} = v |
| val := fn(i.(T)) |
| return val |
| } |
| return fn1() |
| } |
| |
| func main() { |
| want := 123 |
| got := test1(func(s string) int { |
| r, err := strconv.Atoi(s) |
| if err != nil { |
| return 0 |
| } |
| return r |
| }, "123") |
| if got != want { |
| panic(fmt.Sprintf("got %f, want %f", got, want)) |
| } |
| } |
