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

Chris Lattner clattner at apple.com
Wed Dec 28 00:13:16 CST 2016

On Dec 26, 2016, at 2:55 PM, Dave Abrahams via swift-evolution <swift-evolution at swift.org> wrote:
>> // Move `throws` to the end
>> func baz() -> String throws
> I agree that reads much better.

This doesn’t work unless you’re willing to break consistency with function type syntax, or if you’re willing to make function [type/decl] syntax ambiguous.

How would you express this, for example?

	let x : (_ a : Int) throws -> (_ b: Float) throws -> Double

it would be ambiguous to move the ‘throws’ keyword to the end of the function type, because you'd get:

	let x : (_ a : Int) -> (_ b: Float) -> Double throws throws


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