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* Parse optional witness syntax
* Allow failing optional constraint
* Make `is` work with optional constraint
* Allow using optional constraint in checked if statements
* Fix tests
* Make it work with structs
* Fix MSVC build error
* Disallow using `as` with optional constraints
* Update test to match split is/as errors
* Add tests
* Fix uninitialized variables in tests
* Add tests of incorrect uses & fix related bugs
* Mention optional constraints in docs
* format code
* Fix type unification with NoneWitness
* Fix formatting
---------
Co-authored-by: slangbot <186143334+slangbot@users.noreply.github.com>
Co-authored-by: Nathan V. Morrical <natemorrical@gmail.com>
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