Add proposal for `if let` shorthand (#1504)
Add proposal for `if let` shorthand (#1504)

* Add proposal for 'if let' shorthand

* Link to implementation PR and SE pitch thread

* Clean up

* Fix example

* Update motivation, discuss several alternatives considered

* Add more alternatives considered

* Discuss more alternatives considered / future directions, including future ref / inout introducers

* Fix typos, clean up

* Add more through discussion about 'if unwrap x' being shorthand for 'if ref x'

* fix typo
natecook1000/swift-evolution,apple/swift-evolution,natecook1000/swift-evolution,apple/swift-evolution