Slava Pestov 2f727d6b47 RequirementMachine: Opaque archetype support (sort of) ...

Complete support is behind a flag, because it can result in a non-convergent
rewrite system if the opaque result type has a recursive conformance of its
own (eg, `some View` for SwiftUI's View protocol).

Without the flag, it's good enough for simple examples; you just can't have
a requirement that mentions a nested type of a type parameter equated to
the concrete type.

Fixes rdar://problem/88135291, https://bugs.swift.org/browse/SR-15983.

2022-03-17 17:45:59 -04:00

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