[6.0] Fix two bugs with opaque return types -vs- parameter packs #72853
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The names of the private witness table accessor thunks we generate for an opaque return type mangle the concrete conformance of the underlying type. If a conformance requirement of the opaque return type was witnessed by a conditional conformance of a variadic generic type, we would crash because of an unimplemented case in the mangler. Fixes rdar://problem/125668798.
…ePackExpansionLevel Fixes rdar://problem/123645784.
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@swift-ci Please test |
hborla
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Apr 5, 2024
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6.0 cherry-pick of key bits of #72847
Description: Fix infinite recursion in opaque type substitution when parameter packs are present, and a crash when opaque return type witnessed by variadic generic type with conditional conformance.
Reviewed by: @hborla
Risk: Low
Radar: rdar://123645784, rdar://125668798