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https://github.com/polysemy-research/polysemy.git
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48b6768ad4
* Move Polysemy.Internal.Lift to Polysemy.Lift.Type * Add Polysemy.Lift module and runLift interpreter * Add a Sandy reminder * Add explicit foralls and split type signature * Fix import spacing, for there is no "qualified" * Implement runIO in terms of runLift * Rename Lift -> Embed * Replace sendM with embed * Add a Sandy todo for embed version * Rename runEmbed and related runEmbedded (from IO) * runEmbedded -> runEmbeddedInIO * runEmbed -> runEmbedded * Update cabal
26 lines
606 B
Haskell
26 lines
606 B
Haskell
{-# OPTIONS_GHC -fdefer-type-errors -fno-warn-deferred-type-errors #-}
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module LegitimateTypeErrorSpec where
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import Polysemy
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import Test.Hspec
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import Test.ShouldNotTypecheck
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wrongEmbed :: Member (Embed IO) r => Sem r ()
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wrongEmbed = embed putStrLn
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wrongReturn :: Sem (e ': r) () -> Sem r ()
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wrongReturn = reinterpret undefined
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spec :: Spec
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spec = do
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describe "Legitimate type errors" $ do
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it "should be caused by `embed`ing an unsaturated function" $
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shouldNotTypecheck wrongEmbed
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it "should be caused by giving a bad type to reinterpret" $
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shouldNotTypecheck wrongReturn
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