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https://github.com/golang/go
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e24977d231
The next CL will remove the -G flag, effectively hard-coding it to its current default (-G=3). Change-Id: Ib4743b529206928f9f1cca9fdb19989728327831 Reviewed-on: https://go-review.googlesource.com/c/go/+/388534 Reviewed-by: Keith Randall <khr@golang.org> Trust: Matthew Dempsky <mdempsky@google.com> Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gopher Robot <gobot@golang.org>
70 lines
1.2 KiB
Go
70 lines
1.2 KiB
Go
// run -goexperiment fieldtrack
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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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// Test that generics, promoted methods, and //go:nointerface
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// interoperate as expected.
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package main
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import (
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"reflect"
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)
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func TypeString[T any]() string {
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return reflect.TypeOf(new(T)).Elem().String()
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}
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func Test[T, Bad, Good any]() {
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switch interface{}(new(T)).(type) {
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case Bad:
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println("FAIL:", TypeString[T](), "matched", TypeString[Bad]())
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case Good:
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// ok
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default:
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println("FAIL:", TypeString[T](), "did not match", TypeString[Good]())
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}
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}
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func TestE[T any]() { Test[T, interface{ EBad() }, interface{ EGood() }]() }
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func TestX[T any]() { Test[T, interface{ XBad() }, interface{ XGood() }]() }
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type E struct{}
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//go:nointerface
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func (E) EBad() {}
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func (E) EGood() {}
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type X[T any] struct{ E }
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//go:nointerface
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func (X[T]) XBad() {}
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func (X[T]) XGood() {}
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type W struct{ X[int] }
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func main() {
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_ = E.EGood
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_ = E.EBad
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TestE[E]()
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_ = X[int].EGood
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_ = X[int].EBad
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_ = X[int].XGood
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_ = X[int].XBad
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TestE[X[int]]()
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TestX[X[int]]()
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_ = W.EGood
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_ = W.EBad
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_ = W.XGood
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_ = W.XBad
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TestE[W]()
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TestX[W]()
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}
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