Slava Pestov 0507b02024 RequirementMachine: Fix crash-on-invalid with concrete type requirements involving packs ...

We would crash in some cases, or produce a slightly misleading
diagnostic about same-element requirements, which are related but
not quite the same.

In the fullness of time, we should figure out this corner of the
language. Until then, add a new diagnostic since this is really
about same-type requirements between concrete types and packs.

Fixes rdar://159790557.

2025-09-10 20:20:31 -04:00

51 KiB

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