Suyash Srijan f724d1ff85 [SE-0280] Enum cases as protocol witnesses (#28916) ...

* [Typechecker] Allow enum cases without payload to witness a static get-only property with Self type protocol requirement

* [SIL] Add support for payload cases as well

* [SILGen] Clean up comment

* [Typechecker] Re-enable some previously disabled witness matching code

Also properly handle the matching in some cases

* [Test] Update typechecker tests with payload enum test cases

* [Test] Update SILGen test

* [SIL] Add two FIXME's to address soon

* [SIL] Emit the enum case constructor unconditionally when an enum case is used as a witness

Also, tweak SILDeclRef::getLinkage to update the 'limit' to 'OnDemand' if we have an enum declaration

* [SILGen] Properly handle a enum witness in addMethodImplementation

Also remove a FIXME and code added to workaround the original bug

* [TBDGen] Handle enum case witness

* [Typechecker] Fix conflicts

* [Test] Fix tests

* [AST] Fix indentation in diagnostics def file

2020-03-28 10:44:01 +00:00

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