[swift-evolution] Lambda function syntax

[Tino Heth]

> 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).

That's definitely right: Two different separators only shift the problem by one level, but hopefully it won't become common to deal with "functions having functions as parameters that have function parameters that… ;-)
Also there is the different meaning of ":" ("is a...") and "->" ("returns a…")
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