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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
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// Copyright 2021 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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import (
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"fmt"
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"strconv"
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"strings"
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)
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type Stringer interface {
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String() string
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}
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// StringableList is a slice of some type, where the type
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// must have a String method.
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type StringableList[T Stringer] []T
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func (s StringableList[T]) String() string {
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var sb strings.Builder
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for i, v := range s {
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if i > 0 {
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sb.WriteString(", ")
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}
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sb.WriteString(v.String())
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}
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return sb.String()
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}
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type myint int
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func (a myint) String() string {
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return strconv.Itoa(int(a))
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}
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func main() {
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v := StringableList[myint]{myint(1), myint(2)}
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if got, want := v.String(), "1, 2"; got != want {
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panic(fmt.Sprintf("got %s, want %s", got, want))
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}
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}
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