| // Copyright 2023 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 p |
| |
| type F[T any] func(func(F[T])) |
| |
| func f(F[int]) {} |
| func g[T any](F[T]) {} |
| |
| func _() { |
| g(f /* ERROR "type func(F[int]) of f does not match F[T] (cannot infer T)" */) // type inference/unification must not panic |
| } |
| |
| // original test case from issue |
| |
| type List[T any] func(T, func(T, List[T]) T) T |
| |
| func nil[T any](n T, _ List[T]) T { return n } |
| func cons[T any](h T, t List[T]) List[T] { return func(n T, f func(T, List[T]) T) T { return f(h, t) } } |
| |
| func nums[T any](t T) List[T] { |
| return cons(t, cons(t, nil /* ERROR "type func(n T, _ List[T]) T of nil[T] does not match inferred type List[T] for List[T]" */ [T])) |
| } |
