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README: Example usage of Map

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Lysxia 2018-12-17 12:08:29 -05:00
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@ -19,6 +19,12 @@ type instance Eval (FromMaybe a 'Nothing) = a
type instance Eval (FromMaybe a ('Just b)) = b
```
That way, the `FromMaybe` constructor can be passed to higher-order fcfs.
```haskell
Eval (Map (FromMaybe 0) '[ 'Just 1, 'Nothing ]) = '[ 1, 0 ] :: [Nat]
```
Essential language extensions:
```haskell