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test: test method expressions promoted to derived types
This CL adds a test that method expressions where the receiver type is a derived type and embeds a promoted method work correctly. Change-Id: I2e7c96007b6d9e6f942dc14228970ac508ff5c15 Reviewed-on: https://go-review.googlesource.com/c/go/+/422199 Run-TryBot: Matthew Dempsky <mdempsky@google.com> Reviewed-by: David Chase <drchase@google.com> TryBot-Result: Gopher Robot <gobot@golang.org>
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@ -1986,6 +1986,7 @@ var go118Failures = setOf(
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"typeparam/mdempsky/16.go", // 1.18 compiler uses interface shape type in failed type assertions
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"typeparam/mdempsky/17.go", // 1.18 compiler mishandles implicit conversions from range loops
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"typeparam/mdempsky/18.go", // 1.18 compiler mishandles implicit conversions in select statements
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"typeparam/mdempsky/20.go", // 1.18 compiler crashes on method expressions promoted to derived types
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)
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// In all of these cases, the 1.17 compiler reports reasonable errors, but either the
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38
test/typeparam/mdempsky/20.go
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38
test/typeparam/mdempsky/20.go
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@ -0,0 +1,38 @@
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// run
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// Copyright 2022 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 method expressions with a derived receiver type and
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// promoted methods work correctly.
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package main
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func main() {
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F[int]()
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F[string]()
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}
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func F[X any]() {
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call(T[X].M, T[X].N)
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}
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func call[X any](fns ...func(T[X]) int) {
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for want, fn := range fns {
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if have := fn(T[X]{}); have != want {
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println("FAIL:", have, "!=", want)
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}
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}
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}
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type T[X any] struct {
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E1
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*E2[*X]
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}
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type E1 struct{}
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type E2[_ any] struct{}
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func (E1) M() int { return 0 }
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func (*E2[_]) N() int { return 1 }
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