// run // 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. package main func f[G any]() interface{} { return func() interface{} { return func() interface{} { var x G return x }() }() } func main() { x := f[int]() if v, ok := x.(int); !ok || v != 0 { panic("bad") } }