[swift-evolution] Optionals and nil in Switch statement

[Lucas Jordan]

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
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