Source file test/typeparam/issue47925b.go

     1  // run
     2  
     3  // Copyright 2021 The Go Authors. All rights reserved.
     4  // Use of this source code is governed by a BSD-style
     5  // license that can be found in the LICENSE file.
     6  
     7  package main
     8  
     9  type I[T any] interface {
    10  	foo()
    11  }
    12  
    13  type E[T any] interface {
    14  }
    15  
    16  //go:noinline
    17  func f[T I[T]](x T) E[T] {
    18  	// contains a cast from nonempty to empty interface
    19  	return E[T](I[T](x))
    20  }
    21  
    22  type S struct {
    23  	x int
    24  }
    25  
    26  func (s *S) foo() {}
    27  
    28  func main() {
    29  	i := f(&S{x: 7})
    30  	if i.(*S).x != 7 {
    31  		panic("bad")
    32  	}
    33  }
    34  

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