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45ff765b48
This permits constants of the form `const X = T(A)` to add `X` to the stringer output for type `T`. While those constants can be rewritten as `const X T = T(A)`, that becomes tedious and visually noisy when `T` is a long name. It is quite easy to address this easy and common case, while not attempting to solve this with full generality. Fixes #11581. Change-Id: Ifb8e43515f05493de190e02577260d94dd851581 Reviewed-on: https://go-review.googlesource.com/c/146577 Run-TryBot: David Symonds <dsymonds@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Rob Pike <r@golang.org>
42 lines
670 B
Go
42 lines
670 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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// Check that constants defined as a conversion are accepted.
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package main
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import "fmt"
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type Other int // Imagine this is in another package.
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const (
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alpha Other = iota
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beta
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gamma
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delta
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)
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type Conv int
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const (
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Alpha = Conv(alpha)
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Beta = Conv(beta)
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Gamma = Conv(gamma)
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Delta = Conv(delta)
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)
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func main() {
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ck(Alpha, "Alpha")
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ck(Beta, "Beta")
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ck(Gamma, "Gamma")
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ck(Delta, "Delta")
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ck(42, "Conv(42)")
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}
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func ck(c Conv, str string) {
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if fmt.Sprint(c) != str {
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panic("conv.go: " + str)
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}
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}
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