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https://github.com/polysemy-research/polysemy.git
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77 lines
2.0 KiB
Haskell
77 lines
2.0 KiB
Haskell
{-# LANGUAGE BlockArguments #-}
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{-# LANGUAGE DataKinds #-}
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{-# LANGUAGE TemplateHaskell #-}
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{-# LANGUAGE TypeApplications #-}
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{-# OPTIONS_GHC -O2 #-}
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module FusionSpec where
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import qualified Control.Monad.Trans.Except as E
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import qualified Control.Monad.Trans.State.Strict as S
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import Polysemy.Error
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import Polysemy.Internal
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import Polysemy.Internal.Combinators
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import Polysemy.Internal.Effect
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import Polysemy.Internal.Union
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import Polysemy.State
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import Test.Hspec
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import Test.Inspection
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isSuccess :: Result -> Bool
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isSuccess (Success _) = True
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isSuccess (Failure e) = error e
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shouldSucceed :: Result -> Expectation
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shouldSucceed r = r `shouldSatisfy` isSuccess
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spec :: Spec
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spec = do
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describe "fusion" $ do
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it "Union proofs should simplify" $ do
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shouldSucceed $(inspectTest $ 'countDown `hasNoType` ''SNat)
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it "internal uses of StateT should simplify" $ do
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shouldSucceed $(inspectTest $ 'countDown `doesNotUse` ''S.StateT)
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shouldSucceed $(inspectTest $ 'jank `doesNotUse` ''S.StateT)
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it "internal uses of ExceptT should simplify" $ do
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shouldSucceed $(inspectTest $ 'tryIt `doesNotUse` ''E.ExceptT)
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it "`runState . reinterpret` should fuse" $ do
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shouldSucceed $(inspectTest $ 'jank `doesNotUse` 'reinterpret)
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shouldSucceed $(inspectTest $ 'jank `doesNotUse` 'hoist)
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it "who needs Sematic even?" $ do
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shouldSucceed $(inspectTest $ 'countDown `doesNotUse` 'Semantic)
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shouldSucceed $(inspectTest $ 'jank `doesNotUse` 'Semantic)
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shouldSucceed $(inspectTest $ 'tryIt `doesNotUse` 'Semantic)
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go :: Semantic '[State Int] Int
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go = do
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n <- get
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if n <= 0
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then pure n
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else do
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put (n-1)
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go
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tryIt :: Either Bool String
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tryIt = run . runError @Bool $ do
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catch @Bool
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do
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throw False
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\_ -> pure "hello"
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countDown :: Int -> Int
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countDown start = fst $ run $ runState start go
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jank :: Int -> Int
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jank start = fst $ run $ runState start $ go
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