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r? @lcnr
I can't make sense of the new solver tracing logs yet, so I just added the test without explanation.
The old solver does not yet figure out that
Foo == ()
from the where bounds. Unfortunately, even if we make it understand that, it will later try to prove<X as Trait<'static>>::Out<Foo>: Sized
via theis_sized_raw
query, which does not take a list of defineable opaque types, causing that check to fail with an ICE.Thus I'm submitting this test case on its own just to ensure we handle it correctly in the future with any new solver or old solver changes.