Kavon Farvardin 3ab4c7548c Sema: ban extensions of known marker protocols ...

There's no good reason to permit them. Conformances like Copyable and
Sendable are pervasive, so it's as though we are permitting extensions
of `Any`. Until there's a good argument in favor of such extensions,
remove the capability now.

2024-02-07 14:54:36 -08:00

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