[swift-evolution] Move placement of 'throws' statement

[Georgios Moschovitis]

Indeed,
func baz() throws -> String
is confusing. I do prefer these two alternatives:
// Move `throws` to the end
func baz() -> String throws

// Change it to a prefix modifier (like `mutating`)
throwing func baz() -> String
I think I prefer the first one (throws at the very end).

I wouldn’t mind this source-breaking change.
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