[swift-dev] Starter project: SR-2: Build configuration directives can not wrap switch cases

[Meador Inge]

On Sun, Dec 6, 2015 at 5:04 PM, Dmitri Gribenko via swift-dev <
swift-dev at swift.org> wrote:

Hi,
>
> If you're looking for a starter project in the frontend area (parser
> in this case), here is one.
>
> https://bugs.swift.org/browse/SR-2
>
> This code should be accepted, but it is rejected now:
>
> switch 10 {
>   case 10:
>     break
> #if FOO
>   case 20:
>     break
> #endif
> }
>
> $ swiftc /tmp/a.swift
> /tmp/a.swift:5:3: error: 'case' label can only appear inside a
> 'switch' statement
>   case 20:
>   ^
>

Quick question about this one.

As mentioned in SR-2, the current grammar for switch
statements [1] does not allow for compiler control
statements.  So, fixing this involves a grammar
change.

I suspect that grammar changes will require a proposal
on the swift-evo list?

Cheers,

Meador

[1]
https://developer.apple.com/library/mac/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/swift/grammar/switch-statement
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