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+T3169.hs:13:13:
+ Couldn't match type `elt' with `Map b elt'
+ `elt' is a rigid type variable bound by
+ the type signature for
+ lookup :: (a, b) -> Map (a, b) elt -> Maybe elt
+ at T3169.hs:12:3
+ Expected type: Maybe (Map b elt)
+ Actual type: Maybe elt
+ In the return type of a call of `lookup'
+ In the expression: lookup a m :: Maybe (Map b elt)