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// 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" "strings" ) type Stringer interface { String() string } // StringableList is a slice of some type, where the type // must have a String method. type StringableList[T Stringer] []T func (s StringableList[T]) String() string { var sb strings.Builder for i, v := range s { if i > 0 { sb.WriteString(", ") } sb.WriteString(v.String()) } return sb.String() } type myint int func (a myint) String() string { return strconv.Itoa(int(a)) } func main() { v := StringableList[myint]{myint(1), myint(2)} if got, want := v.String(), "1, 2"; got != want { panic(fmt.Sprintf("got %s, want %s", got, want)) } }
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