go issue47925b 源码
golang issue47925b 代码
文件路径：/test/typeparam/issue47925b.go
// 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
type I[T any] interface {
foo()
}
type E[T any] interface {
}
//go:noinline
func f[T I[T]](x T) E[T] {
// contains a cast from nonempty to empty interface
return E[T](I[T](x))
}
type S struct {
x int
}
func (s *S) foo() {}
func main() {
i := f(&S{x: 7})
if i.(*S).x != 7 {
panic("bad")
}
}
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