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Fixes #90444
when we relate something like:
fn(fn((), (), u32))withfn(fn((), (), ()))we relate the inner fn ptrs:
fn((), (), u32)withfn((), (), ())yielding a
TypeError::ArgumentSorts(_, 2)which we then use as theTypeErrorfor thefn(fn(..))which later causes the ICE as the2does not correspond to any input or output types infn(_)r? @estebank