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Interpose with an upcast.

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This commit is contained in:
Rob Rix 2018-10-23 11:30:58 -04:00
parent 92ac53252e
commit c53a6aa511
1 changed files with 4 additions and 4 deletions
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8
src/Data/Abstract/Value/Concrete.hs
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@ -163,10 +163,10 @@ instance ( Member (Reader ModuleInfo) sig
interpose :: (Member eff sig, HFunctor eff, Carrier sig m)
=> (forall v. eff m (m v) -> m v)
-> Eff (InterposeC eff m) a
-> m a
interpose handler = runInterposeC handler . interpret
=> (forall v. eff (Eff m) (Eff m v) -> Eff m v)
-> Eff m a
-> Eff m a
interpose handler = runInterposeC handler . interpret . upcast
upcast :: Eff m a -> Eff (InterposeC eff (Eff m)) a
upcast m = Eff (\ k -> InterposeC (\ f -> m >>= runInterposeC f . k))