[swift-evolution] Revisiting SE-0110

Fri, 26 May 2017 08:22:50 -0700 

Alternatively, for maximum consistency we could make "{ arg in ..." illegal as 
well, requiring parentheses around "arg". This would mirror the parentheses 
necessary in e.g., "let f: (Int) -> Int", and there would be no confusion as to 
why " { arg in ..." is legal but not "{ (key, value) in ...".
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