issue52031.go

     1  // -lang=go1.12
     2  
     3  // Copyright 2022 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 go1_12
     8  
     9  type resultFlags uint
    10  
    11  // Example from #52031.
    12  //
    13  // The following shifts should not produce errors on Go < 1.13, as their
    14  // untyped constant operands are representable by type uint.
    15  const (
    16  	_ resultFlags = (1 << iota) / 2
    17  
    18  	reportEqual
    19  	reportUnequal
    20  	reportByIgnore
    21  	reportByMethod
    22  	reportByFunc
    23  	reportByCycle
    24  )
    25  
    26  // Invalid cases.
    27  var x int = 1
    28  var _ = (8 << x /* ERROR "signed shift count .* requires go1.13 or later" */)
    29  
    30  const _ = (1 << 1.2 /* ERROR "truncated to uint" */)
    31  
    32  var y float64
    33  var _ = (1 << y /* ERROR "must be integer" */)
    34
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