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7ae95b266e
fix generalizer unsoundness I ended up getting confused while trying to flip the variances when flipping the order. Should be all right now. This is only exploitable when generalizing if the `ambient_variance` of the relation is `Contravariant`. This can currently only be the case in the NLL generalizer which only rarely generalizes, causing us to miss this regression. Very much an issue with #121462 however.