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https://github.com/golang/go
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63e6ed9258
When constant values change but stringer has not been run again, we can get misleading string values. Protect against this by generating code that will fail with a compiler error when this happens. Most compilers should be smart enough to omit the code containing the checks. Change-Id: I7a36d20f014cba0e7d88851d1b649a098ee30d76 Reviewed-on: https://go-review.googlesource.com/c/tools/+/163637 Run-TryBot: Daniel Martí <mvdan@mvdan.cc> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
40 lines
690 B
Go
40 lines
690 B
Go
// 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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// This file is the same as day.go except the constants have different values.
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package main
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import "fmt"
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type Day int
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const (
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Sunday Day = iota
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Monday
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Tuesday
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Wednesday
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Thursday
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Friday
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Saturday
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)
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func main() {
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ck(Monday, "Monday")
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ck(Tuesday, "Tuesday")
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ck(Wednesday, "Wednesday")
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ck(Thursday, "Thursday")
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ck(Friday, "Friday")
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ck(Saturday, "Saturday")
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ck(Sunday, "Sunday")
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ck(-127, "Day(-127)")
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ck(127, "Day(127)")
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}
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func ck(day Day, str string) {
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if fmt.Sprint(day) != str {
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panic("day.go: " + str)
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}
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}
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