Slava Pestov 57d1600b99 RequirementMachine: Better tests for concrete type requirements with opaque archetypes ...

Also fix a weird latent bug. In lookupConcreteNestedType(), we would
push nullptr onto the concreteDecls vector if the opaque archetype
did not have a nested type with this name. However, this did not
turn out to be a problem, since in this code path we would only
have a single element in this vector, and the later call to
std::min_element() did not end up dereferencing the null pointer.

However this is very dodgy, so tweak the code to prevent this from
happening and add a test case (which already passed anyway).

2022-03-22 23:53:40 -04:00

2.3 KiB

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