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

[Dave Abrahams]

> 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 <mailto: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 <mailto: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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-Dave



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