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Define a function to close a term.

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Rob Rix 2019-07-18 16:08:32 -04:00
parent 8371475e43
commit a83cdffa73
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1 changed files with 5 additions and 0 deletions
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semantic-core/src/Data/Scope.hs
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@ -2,6 +2,7 @@
module Data.Scope
( Incr(..)
, incr
, closed
, Scope(..)
, fromScope
, toScope
@ -44,6 +45,10 @@ incr :: (a -> c) -> (b -> c) -> Incr a b -> c
incr z s = \case { Z a -> z a ; S b -> s b }
closed :: Traversable f => f a -> Maybe (f b)
closed = traverse (const Nothing)
newtype Scope a f b = Scope { unScope :: f (Incr a (f b)) }
deriving (Foldable, Functor, Traversable)