| // Copyright 2021 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. |
| |
| // Verify that we get an empty type set (not just an error) |
| // when using an invalid ~A. |
| |
| package p |
| |
| type A int |
| type C interface { |
| ~ /* ERROR invalid use of ~ */ A |
| } |
| |
| func f[_ C]() {} |
| func g[_ interface{ C }]() {} |
| func h[_ C | int]() {} |
| |
| func _() { |
| _ = f[int /* ERROR cannot implement C \(empty type set\) */] |
| _ = g[int /* ERROR cannot implement interface{C} \(empty type set\) */] |
| _ = h[int] |
| } |
