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Define block using a newtype helper.

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We can’t rely on having a Semigroup instance for the term type.
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Rob Rix 2019-07-17 11:42:16 -04:00
parent 1e3e8dd425
commit 3e53644a36
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1 changed files with 8 additions and 4 deletions
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12
semantic-core/src/Data/Core.hs
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@ -1,5 +1,5 @@
{-# LANGUAGE DeriveGeneric, DeriveTraversable, FlexibleContexts, LambdaCase, MultiParamTypeClasses, OverloadedStrings, QuantifiedConstraints, RankNTypes,
ScopedTypeVariables, StandaloneDeriving, TypeFamilies, TypeOperators #-}
ScopedTypeVariables, StandaloneDeriving, TypeFamilies, TypeOperators, UndecidableInstances #-}
module Data.Core
( Core(..)
, CoreF(..)
@ -41,7 +41,6 @@ import Data.Coerce
import Data.Foldable (foldl')
import Data.List.NonEmpty
import Data.Loc
import Data.Maybe
import Data.Name
import Data.Scope
import Data.Stack
@ -127,8 +126,13 @@ infixl 4 :.
let' :: (Carrier sig m, Member CoreF sig) => User -> m a
let' = send . Let
block :: (Foldable t, Carrier sig m, Member CoreF sig, Semigroup (m a)) => t (m a) -> m a
block = fromMaybe unit . foldMap Just
block :: (Foldable t, Carrier sig m, Member CoreF sig) => t (m a) -> m a
block = maybe unit getBlock . foldMap (Just . Block)
newtype Block m a = Block { getBlock :: m a }
instance (Carrier sig m, Member CoreF sig) => Semigroup (Block m a) where
Block a <> Block b = Block (send (a :>> b))
lam :: (Eq a, Carrier sig m, Member CoreF sig) => Named a -> m a -> m a
lam (Named u n) b = send (Lam u (bind1 n b))