gcc/testsuite/go.test/test/alias1.go

   1 // run
   2
   3 // Copyright 2011 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 // Test that dynamic interface checks treat byte=uint8
   8 // and rune=int or rune=int32.
   9
  10 package main
  11
  12 func main() {
  13         var x interface{}
  14
  15         x = byte(1)
  16         switch x.(type) {
  17         case uint8:
  18                 // ok
  19         default:
  20                 panic("byte != uint8")
  21         }
  22
  23         x = uint8(2)
  24         switch x.(type) {
  25         case byte:
  26                 // ok
  27         default:
  28                 panic("uint8 != byte")
  29         }
  30
  31         rune32 := false
  32         x = rune(3)
  33         switch x.(type) {
  34         case int:
  35                 // ok
  36         case int32:
  37                 // must be new code
  38                 rune32 = true
  39         default:
  40                 panic("rune != int and rune != int32")
  41         }
  42
  43         if rune32 {
  44                 x = int32(4)
  45         } else {
  46                 x = int(5)
  47         }
  48         switch x.(type) {
  49         case rune:
  50                 // ok
  51         default:
  52                 panic("int (or int32) != rune")
  53         }
  54 }