mirror of
https://github.com/golang/go
synced 2024-11-12 07:10:22 -07:00
5355753009
We don't usually reformat the test directory, but all of the files in test/typeparam are syntactically valid. I suspect the misformattings here are because developers aren't re-installing gofmt with -tags=typeparams, not intentionally exercising non-standard formatting. Change-Id: I3767d480434c19225568f3c7d656dc8589197183 Reviewed-on: https://go-review.googlesource.com/c/go/+/338093 Trust: Matthew Dempsky <mdempsky@google.com> Trust: Robert Griesemer <gri@golang.org> Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Robert Griesemer <gri@golang.org>
47 lines
847 B
Go
47 lines
847 B
Go
// run -gcflags=-G=3
|
|
|
|
// 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))
|
|
}
|
|
}
|