> On 11 Oct 2016, at 08:49, Benjamin Spratling <bspratl...@mac.com> wrote:
>
> Howdy,
> The error message is not saying that aFunction throws, it says “??" might
> throw. After all, you supplied a ()rethrows->(Int) to it as its second
> argument, which is wrapping a ()throws->Int, “bFunction()"
> ?? and && and || wrap the trailing expression in an @autoclosure.
>
> I am a little surprised two “try” are not required. This would be my
> expectation:
>> let value = try aFunction() ?? try bFunction()
> but, using try to the right of a non-assignment operator is not allowed.
>
> This, however, is not disallowed:
>
> let value = try aFunction() ?? (try bFunction())
>
> The purpose of the @autoclosure is to make developers forget they need to
> write a closure, and it apparently worked for you.
>
> -Ben Spratling
>
Yeah, I understand the reason for it, but I still think we should change it so
you write the ‘try’ before the part which actually throws. Perhaps the rule
should be something more general around rethrowing autoclosures?
After all, I thought that was the entire point of the ‘try’ keyword. The
compiler doesn't really need it (it already knows what throws and what
doesn’t), but it helps humans to mark where the throwing stuff happens.
Karl
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