[swift-users] Expression pattern cannot be a named tuple constant

[Neil Faiman]

SR-1993.

> On Jul 5, 2016, at 4:15 PM, Jordan Rose <jordan_rose at apple.com> wrote:
> 
> I'd definitely consider that a bug. Can you file it at bugs.swift.org?
> 
> Jordan
> 
>> On Jul 4, 2016, at 14:56, Neil Faiman via swift-users <swift-users at swift.org> wrote:
>> 
>> (Resending — this didn’t get any responses when I sent it a month ago.)
>> 
>> Swift 2.2 in Xcode 7.3.1.
>> 
>> Apparently you cannot use a named tuple constant as an expression pattern in a case label.
>> 
>> func test(x: Int, y: Int) -> Int {
>>  let int_1 = 1
>>  switch x {
>>  case 0:
>>      return 0
>>  case int_1:
>>      return 1
>>  default:
>>      break
>>  }
>> 
>>  let int_1_1: (Int, Int) = (1, 1)
>>  switch (x, y) {
>>  case (0, 0):
>>      return 0
>>  case int_1_1:	// <<<<
>>      return 1
>>  default:
>>      return -1
>>  }
>> }
>> 
>> error: expression pattern of type '(Int, Int)' cannot match values of type '(Int, Int)'
>>  case int_1_1:
>>       ^~~~~~~
>> 
>> The error message is particularly amusing.
>> 
>> 	- Neil Faiman
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>