[swift-evolution] [Proposal Idea] catching functions for composable and cps error handling

[Brent Royal-Gordon]

> The basic idea is to allow catching functions that would be a complement to throwing functions.

I have an enormous proposal on the subject of formalizing completion handlers which includes catching functions. I haven’t posted it because I figured it’d be out of scope for Swift 3, but I can if there’s interest.

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Brent Royal-Gordon
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