go/test/typeparam/issue53762.go
Robert Griesemer 1dd24d8216 go/types, types2: don't infer type argument for unused parameter in interfaces
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>
2023-05-25 21:37:01 +00:00

18 lines
309 B
Go

// compile
// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
type Value[T any] interface {
}
func use[T any](v Value[T]) {
_, _ = v.(int)
}
func main() {
use[int](Value[int](1))
}