[swift-evolution] Lambda function syntax

[Alan Skipp]

> I'm completely against replacing '->' by ':' it would make unreadable the declaration of a function taking a closure as parameter, or returning one (among other things).
> 
> -- 
> Pierre

I agree with Pierre. Parameter names and functions as arguments or return values are easily distinguished currently. 

Replacing -> with :, would severely impact readability. 
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