A couple of tiny variadic generic fixes [5.9] #66443
Merged
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Description: Implements a missing case in conformance path evaluation; we didn't handle pack conformances there at all, so the compiler would crash while substituting a type parameter pack whose conformance path had more than one step.
Risk: Low, this only impacts variadic generics.
Reviewed by: @hborla
Radar: rdar://110363503