[swift-evolution] [Pitch] Guard/Catch

[Jon Shier]

	I didn’t think I was going to like it but I really do. My only concern, which isn’t really a deal breaker, is what it would look like to chain multiple try and let statement in the same guard. Unless that scenario works well I don’t think you could convince others. i.e. In the case where I have:

guard try something(), let thing = optionalThing catch { }

What happens when the let fails? No implicit error?



Jon


> On Jul 5, 2017, at 1:30 PM, Soroush Khanlou via swift-evolution <swift-evolution at swift.org> wrote:
> 
> I’d like to propose a guard/catch construct to the language. It would allow code to use throwing functions and handle errors fully, without straying from a happy path. do/catch can be a bit heavy-handed sometimes, and it would be nice to be able to handle throwing functions without committing to all the nesting and ceremony of do/catch.
> 
> Full proposal, which discusses all the corner cases and alternatives:
> https://gist.github.com/khanlou/8bd9c6f46e2b3d94f0e9f037c775f5b9 <https://gist.github.com/khanlou/8bd9c6f46e2b3d94f0e9f037c775f5b9>
> 
> Looking forward to feedback!
> 
> Soroush
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