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This change enables the relaxed syntax for constraint literals as proposed in issue #48424 and adds a simple smoke test for the compiler. (Most of the relevant changes are in the syntax and types2 package which have more extensive tests for this.) This makes it possible to experiment with the new syntax while we contemplate the fate of #48424. If #48424 is accepted, this change can remain. If #48424 is not accepted, reverting this CL will remove this feature in the compiler. For #48424. Change-Id: I624fbb37c2f616ee9ad692e17e4fc75c9d5b06e5 Reviewed-on: https://go-review.googlesource.com/c/go/+/353389 Trust: Robert Griesemer <gri@golang.org> Trust: Dan Scales <danscales@google.com> Run-TryBot: Robert Griesemer <gri@golang.org> Reviewed-by: Robert Findley <rfindley@google.com> Reviewed-by: Dan Scales <danscales@google.com>
55 lines
877 B
Go
55 lines
877 B
Go
// run
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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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// Smoke test for constraint literals with elided interface
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// per issue #48424.
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package main
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func identity[T int](x T) T {
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return x
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}
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func min[T int|string](x, y T) T {
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if x < y {
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return x
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}
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return y
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}
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func max[T ~float64](x, y T) T {
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if x > y {
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return x
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}
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return y
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}
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func main() {
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if identity(1) != 1 {
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panic("identity(1) failed")
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}
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if min(2, 3) != 2 {
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panic("min(2, 3) failed")
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}
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if min("foo", "bar") != "bar" {
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panic(`min("foo", "bar") failed`)
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}
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if max(2, 3) != 3 {
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panic("max(2, 3) failed")
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}
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}
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// Some random type parameter lists with elided interfaces.
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type (
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_ [T struct{}] struct{}
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_ [M map[K]V, K comparable, V any] struct{}
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_ [_ interface{}|int] struct{}
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)
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