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https://github.com/golang/go
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1dd24d8216
Two interface types that are assignable don't have to be identical; specifically, if they are defined types, they can be different defined types. If those defined types specify type parameters which are never used, do not infer a type argument based on the instantiation of a matching defined type. Adjusted three existing tests where we inferred type arguments incorrectly. Fixes #60377. Change-Id: I91fb207235424b3cbc42b5fd93eee619e7541cb7 Reviewed-on: https://go-review.googlesource.com/c/go/+/498315 Auto-Submit: Robert Griesemer <gri@google.com> Reviewed-by: Robert Findley <rfindley@google.com> Reviewed-by: Robert Griesemer <gri@google.com> Run-TryBot: Robert Griesemer <gri@google.com> TryBot-Result: Gopher Robot <gobot@golang.org>
43 lines
665 B
Go
43 lines
665 B
Go
// 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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package main
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type TaskInput interface {
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deps() []*taskDefinition
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}
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type Value[T any] interface {
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metaValue
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}
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type metaValue interface {
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TaskInput
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}
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type taskDefinition struct {
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}
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type taskResult struct {
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task *taskDefinition
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}
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func (tr *taskResult) deps() []*taskDefinition {
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return nil
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}
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func use[T any](v Value[T]) {
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_, ok := v.(*taskResult)
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if !ok {
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panic("output must be *taskResult")
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}
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}
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func main() {
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tr := &taskResult{&taskDefinition{}}
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use[string](Value[string](tr))
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}
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