Suyash Srijan 0d9f63474a [Sema] Emit a diagnostic when extending a protocol with a redundant requirement (#20503) ...

* Emit a warning diagnostic if an extension contains a redundant requirement

* Updates diagnostic message and checks if the extension type is a protocol

* Updates indentation and extracts self type

* [ast] Updates diagnostic message

* [ast] fix indentation

* [ast] Change ':' to 'to' in 'protocol_extension_redundant_requirement'

* [sema] Adds protocol extension redundant requirement check

Moved from TypeCheckRequests to TypeCheckGeneric

* [ast] fix some crashes related to null ptrs, check self type before emitting a diagnostic, update tests

* [ast] renames 'owner' to 'ext'

* [sema] fix style

* [test] Add another test case for redundant requirement

Co-Authored-By: theblixguy <suyashsrijan@outlook.com>

* [test] fix failing test

The test was failing because A has already been declared as a typealias.

2018-11-15 19:18:51 -08:00

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