[swift-evolution] Remove (!) logical negation operator

[Al Skipp]

> I cannot think of a language where I don’t have ! as negate (which I read as not).

There’s Haskell, a language well endowed with cryptic operators, but not prefix !, it uses a ‘not’ function instead.

You could do the same in Swift, should you wish:

func not(bool: Bool) -> Bool { return !bool }

And because in Swift, ‘if’ doesn’t require braces around the predicate, it doesn’t look too bad.
if not(x) { …

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