[swift-evolution] Missing warnings for unused literals (and results)?

[Jens Persson]

> Feel free to tack it on to SR-245; we might as well do them all at the
same time.
Thanks, done.


On Mon, Feb 1, 2016 at 10:14 PM, Jordan Rose <jordan_rose at apple.com> wrote:

> Yep. I'd just consider this a bug, though someone from the standard
> library would have to confirm that they don't consider it an API change.
> Feel free to tack it on to SR-245; we might as well do them all at the same
> time.
>
> Jordan
>
> On Feb 1, 2016, at 9:44, Félix Cloutier via swift-evolution <
> swift-evolution at swift.org> wrote:
>
> I think that there should be a warning for unused literals. I can't think
> of any case where you would like to have a literal just hanging there in
> Swift.
>
> Félix
>
> Le 1 févr. 2016 à 06:15:32, Jens Persson via swift-evolution <
> swift-evolution at swift.org> a écrit :
>
> func perhapsConfusing() {
>     let s =
>     "Since this function compiles fine. One might "
>     "think that string literals in Swift can be "
>     "written like this. But that is not the case. "
>     "Only the first string literal will be printed."
>     "The rest (including eg this) will be silently "
>     "ignored."
>     12.34 // As will this.
>     12 + 4 // And this.
>     123 == 456 // And this.
>     print(s) // Prints: "Since this function compiles fine. One might "
> }
>
> Besides being possibly surprising for newcomers (who may assume string
> literals split across several lines as above will be joined), there are
> some related inconsistencies in whether warnings are generated for unused
> results or not, for example
> 123 == 456 // Unused result is silently ignored, while
> 1.2 == 3.4 // produces a warning: Result of call to '==' is unused.
> (The following bug report is about unused results, but it doesn't mention
> the IMHO similar unused-literals-case:
> https://bugs.swift.org/browse/SR-245 )
>
> So my question is:
> Should/could there be a warning for unused literals?
>
> /Jens
>
> _______________________________________________
> swift-evolution mailing list
> swift-evolution at swift.org
> https://lists.swift.org/mailman/listinfo/swift-evolution
>
>
> _______________________________________________
> swift-evolution mailing list
> swift-evolution at swift.org
> https://lists.swift.org/mailman/listinfo/swift-evolution
>
>
>


-- 
bitCycle AB | Smedjegatan 12 | 742 32 Östhammar | Sweden
http://www.bitcycle.com/
Phone: +46-73-753 24 62
E-mail: jens at bitcycle.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.swift.org/pipermail/swift-evolution/attachments/20160202/e9a8a170/attachment.html>