issue26094.go

     1  // run
     2  
     3  // Copyright 2018 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  import "strings"
    10  
    11  var X interface{}
    12  
    13  type T struct{}
    14  
    15  func scopes() {
    16  	p, ok := recover().(error)
    17  	if ok && strings.Contains(p.Error(), "different scopes") {
    18  		return
    19  	}
    20  	panic(p)
    21  }
    22  
    23  func F1() {
    24  	type T struct{}
    25  	X = T{}
    26  }
    27  
    28  func F2() {
    29  	type T struct{}
    30  	defer scopes()
    31  	_ = X.(T)
    32  }
    33  
    34  func F3() {
    35  	defer scopes()
    36  	_ = X.(T)
    37  }
    38  
    39  func F4() {
    40  	X = T{}
    41  }
    42  
    43  func main() {
    44  	F1() // set X to F1's T
    45  	F2() // check that X is not F2's T
    46  	F3() // check that X is not package T
    47  	F4() // set X to package T
    48  	F2() // check that X is not F2's T
    49  }
    50
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