[swift-users] Compiler can't infer map transfer closure return type?

[Erica Sadun]

> On Mar 7, 2016, at 6:24 PM, Jordan Rose <jordan_rose at apple.com> wrote:
> 
> 
>> On Mar 7, 2016, at 17:21, Erica Sadun <erica at ericasadun.com <mailto:erica at ericasadun.com>> wrote:
>> 
>> 
>>> On Mar 7, 2016, at 6:15 PM, Jordan Rose via swift-users <swift-users at swift.org <mailto:swift-users at swift.org>> wrote:
>>>  Today there's at least a simple rule: if the closure consists of a single expression (or a single return statement), the compiler will look at the body; otherwise it won't.
>> 
>> Would it be so hard to have a rule that if there's an unambiguous expression as the last line of a closure that
>> it automagically acts as a default warn-on-unused-result return? So many of my two-line closures would
>> benefit from this.
> 
> What does that mean? You can't see how the closure is being called, so how do you know if the result is used or unused?
> 
> Jordan
> 

Okay, fine.

Would it be so hard to have a rule when there's an unambiguous expression as the last line of a closure that
it automagically acts as a default return? So many of my two-line closures would benefit from this.

-- E, clarifying

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