[swift-users] experimental conditional conformances flag

[Jens Persson]

I've now installed 2017-12-05 snapshot and can confirm that it too works
for me.
In more detail:

1. Install swift-DEVELOPMENT-SNAPSHOT-2017-12-05-a-osx.pkg

2. Restart Xcode (I'm using Xcode 9.2 (9C40b))
    (I guess it shouldn't be necessary to restart, but I think it might be
...)

3. Create a new command line project.

4. Put -enable-experimental-conditional-conformances in Other Swift Flags
in the project's Build Settings.

5. Enter the following code in main.swift and Build (which works without
errors):

protocol P {}
struct S<T> {}
extension S: P where T: P {}


Regarding step 2. I'm not 100% sure, but I think that it might be necessary
to restart Xcode after installing a new snapshot, because even if the new
snapshot can be selected from the toolchains menu, it doesn't take affect
until after restarting Xcode. I'm always restarting Xcode after installing
and selecting a new toolchain. Someone please correct me if you can prove
that this isn't necessary.

/Jens

On Wed, Dec 6, 2017 at 7:48 AM, Jens Persson via swift-users <
swift-users at swift.org> wrote:

> It works for me with Xcode 9.1 and 9.2 using latest dev snapshot (from
> 2017-11-28 and 2017-12-03), I added -enable-experimental-conditional-conformances
> in Other Swift Flags as you show in the screenshot.
> /Jens
>
> On Wed, Dec 6, 2017 at 4:32 AM, Matt Whiteside via swift-users <
> swift-users at swift.org> wrote:
>
>> Hello Swift Users,
>>
>> [This is a resend with smaller attachment]  Has anyone had luck passing
>> the new '-enable-experimental-conditional-conformances' flag to Xcode?
>> It works when I run swift from the command line, with the Dec. 5th snapshot
>> toolchain, but not Xcode.  I have tried whats in the screenshot below as
>> well as adding -Xfrontend, but I’m still getting the usual ‘extension of
>> protocol cannot have an inheritance clause’ error:
>>
>> Thanks for any suggestions on this,
>>
>> Matt
>>
>>
>>
>>
>>
>> _______________________________________________
>> swift-users mailing list
>> swift-users at swift.org
>> https://lists.swift.org/mailman/listinfo/swift-users
>>
>>
>
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>
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