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https://github.com/golang/go
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2493072db6
There's no need for a and b to match types. The typechecker already ensured that a and b are both slices with the same base type, or a and b are (possibly named) []byte and string. The optimization to treat append(b, make([], ...)) as a zeroing slice extension doesn't fire when there's a OCONVNOP wrapping the make. Fixes #53888 Change-Id: Ied871ed0bbb8e4a4b35d280c71acbab8103691bc Reviewed-on: https://go-review.googlesource.com/c/go/+/418475 TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Matthew Dempsky <mdempsky@google.com> Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com> Reviewed-by: Keith Randall <khr@google.com> Run-TryBot: Keith Randall <khr@golang.org>
38 lines
707 B
Go
38 lines
707 B
Go
// run
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// Copyright 2018 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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"strings"
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)
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type T struct{}
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const maxInt = int(^uint(0) >> 1)
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func main() {
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s := make([]T, maxInt)
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shouldPanic("len out of range", func() { s = append(s, T{}) })
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var oneElem = make([]T, 1)
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shouldPanic("len out of range", func() { s = append(s, oneElem...) })
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}
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func shouldPanic(str string, f func()) {
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defer func() {
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err := recover()
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if err == nil {
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panic("did not panic")
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}
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s := err.(error).Error()
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if !strings.Contains(s, str) {
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panic("got panic " + s + ", want " + str)
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}
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}()
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f()
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}
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