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NoMatchErr.hs:19:7:
Could not deduce (Memo d0 ~ Memo d)
from the context (Fun d)
bound by the type signature for f :: Fun d => Memo d a -> Memo d a
at NoMatchErr.hs:19:7-37
NB: `Memo' is a type function, and may not be injective
The type variable `d0' is ambiguous
Expected type: Memo d a -> Memo d a
Actual type: Memo d0 a -> Memo d0 a
In the ambiguity check for:
forall d a. Fun d => Memo d a -> Memo d a
In the type signature for `f': f :: Fun d => Memo d a -> Memo d a
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