I don't see it as a bug. The if statement calls an equality function which
promotes the lhs to an Optional (or that accepts a non optional as lhs - can't
remember) but the switch statement does pattern matching. Does the the compiler
warn you when pattern matching an optional with a non-optional case?
> On 29 Jun 2016, at 07:16, Charlie Monroe via swift-evolution
> <swift-evolution@swift.org> wrote:
>
> I nevertheless think that this is a bug and should be addressed. There is no
> reason where
>
> if stringOptional == stringNonOptional { ... }
>
> works, but pretty much the same construct doesn't work in the switch-case. It
> should be perhaps solved via a bugreport at http://bugs.swift.org and via
> evolution, though...
>
>> On Jun 29, 2016, at 12:31 AM, Nevin Brackett-Rozinsky via swift-evolution
>> <swift-evolution@swift.org> wrote:
>>
>> I just got home and tested. The answer is yes, `case "text"?` does work.
>>
>> let optStr : String? = "text"
>> switch optStr {
>> case nil : print("Nil")
>> case "text"? : print("Success")
>> default : print("Default")
>> }
>> // Prints `Success`
>>
>>
>> Nevin
>>
>>> On Tue, Jun 28, 2016 at 12:27 PM, Nevin Brackett-Rozinsky
>>> <nevin.brackettrozin...@gmail.com> wrote:
>>> Does `case "text"?` work?
>>>
>>>
>>>> On Tuesday, June 28, 2016, Kevin Nattinger via swift-evolution
>>>> <swift-evolution@swift.org> wrote:
>>>> Case .none:
>>>> Case .some("string"):
>>>>
>>>>
>>>>> On Jun 28, 2016, at 06:40, Lucas Jordan via swift-evolution
>>>>> <swift-evolution@swift.org> wrote:
>>>>>
>>>>> Forgive me if this was/is discussed already, I am new to the process
>>>>> here....
>>>>>
>>>>> (code is attached as a playground too)
>>>>>
>>>>>
>>>>>
>>>>> Sometimes when I am working with a String? nil can be a reasonable value,
>>>>> and what I want to do is something like the following:
>>>>>
>>>>> import UIKit
>>>>>
>>>>>
>>>>>
>>>>> var str:String? = "Hello, playground"
>>>>>
>>>>>
>>>>>
>>>>> switch str{
>>>>>
>>>>> case nil:
>>>>>
>>>>> print("Nil!")
>>>>>
>>>>> case "Hello, playground": //it would be super nice if this worked.
>>>>>
>>>>> print("Match")
>>>>>
>>>>> default:
>>>>>
>>>>> print("Some other non nil value?")
>>>>>
>>>>> }
>>>>>
>>>>>
>>>>>
>>>>> But it does not work, the orange text is a compile time error,
>>>>> "Expression pattern of type 'String' cannot match value of type
>>>>> 'String?'. I realize that this can be replaced with a let statement (case
>>>>> let s where s == "Hello, playground":), but that is verbose.
>>>>>
>>>>> Seems like the compiler could be OK with the orange text, since it is
>>>>> clearly not nil.
>>>>>
>>>>> Thoughts?
>>>>>
>>>>> -Lucas
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> <NilInSwitchStatements.playground.zip>
>>>>> _______________________________________________
>>>>> swift-evolution mailing list
>>>>> swift-evolution@swift.org
>>>>> https://lists.swift.org/mailman/listinfo/swift-evolution
>>
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>> swift-evolution mailing list
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>
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