[swift-dev] This little program currently compiles fine, but should it?

[Jens Persson]

Filed:
https://bugs.swift.org/browse/SR-245

On Tue, Dec 15, 2015 at 11:54 PM, Dave Abrahams <dabrahams at apple.com> wrote:

>
> On Dec 14, 2015, at 11:04 AM, Jens Persson via swift-dev <
> swift-dev at swift.org> wrote:
>
> Yes, and I don't know if there is any particular reason why the ==
> operator for Int doesn't have @warn_unused_result while the one for Doubles
> has:
>
> func f() { 1 == 2 } // OK
> func g() { 1.0 == 2.0 } // Warning: Result of call '==' is unused
>
>
> That’s an oversight; please file a radar!
>
>
> On Mon, Dec 14, 2015 at 7:40 PM, Johan Jensen <jj at johanjensen.dk> wrote:
>
>> Because currently only unused variable/constant declarations have
>> warnings/fix-its attached to them.
>> There have been some discussion on making non-void functions warn of
>> unused results
>> <https://lists.swift.org/pipermail/swift-evolution/Week-of-Mon-20151207/001580.html>
>>  and it’s possible that this would be in style with that.
>> Perhaps (basically) empty statements should also give a warning?
>>
>> —Johan
>>
>> On Mon, Dec 14, 2015 at 7:08 PM, Jens Persson via swift-dev <
>> swift-dev at swift.org> wrote:
>>
>>> func ok() {
>>>     let s = "see"; "Why are there exactly "
>>>     0 == 0 * 42
>>>     "warnings and errors in this code"
>>>     let t = s + "?"
>>>     print(t)
>>> }
>>> ok() // see?
>>>
>>>
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>>
>
>
> --
> bitCycle AB | Smedjegatan 12 | 742 32 Östhammar | Sweden
> http://www.bitcycle.com/
> Phone: +46-73-753 24 62
> E-mail: jens at bitcycle.com
>
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>
> -Dave
>
>
>
>


-- 
bitCycle AB | Smedjegatan 12 | 742 32 Östhammar | Sweden
http://www.bitcycle.com/
Phone: +46-73-753 24 62
E-mail: jens at bitcycle.com
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