5adce9fa20
@kha @dselsam Suppose we are trying to retrieve the global instances for `(Monad (StateM Nat))`. During retrieval, we reducde `StateM Nat` into `fun x => StateT Nat Id x` However, the `DiscrTree` contains an entry for `Monad (StateT * *)`. Thus, we fail to retrieve any instance. I fixed the particular issue by using eta reduction. Not sure we will encounter other definitional-equality related problems . |
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