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Fix pass in stateT and eitherT MonadWriter instances #154

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Fix pass in stateT and eitherT MonadWriter instances #154

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8 changes: 4 additions & 4 deletions theories/Data/Monads/EitherMonad.v
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Original file line number Diff line number Diff line change
Expand Up @@ -90,12 +90,12 @@ Section except.
| (inl l, _) => ret (inl l)
| (inr a, t) => ret (inr (a, t))
end)
; pass := fun _ c => mkEitherT (
; pass := fun _ c => mkEitherT (pass (
x <- unEitherT c ;;
match x with
| inl s => ret (inl s)
| inr (a,f) => pass (ret (inr a, f))
end)
| inl s => ret (inl s, fun x => x)
| inr (a, f) => ret (inr a, f)
end))
}.

Global Instance MonadFix_eitherT (MF : MonadFix m) : MonadFix eitherT :=
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4 changes: 2 additions & 2 deletions theories/Data/Monads/StateMonad.v
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Original file line number Diff line number Diff line change
Expand Up @@ -79,8 +79,8 @@ Section StateType.
; listen := fun _ c => mkStateT (fun s => bind (listen (runStateT c s))
(fun x => let '(a,s,t) := x in
ret (a,t,s)))
; pass := fun _ c => mkStateT (fun s => bind (runStateT c s) (fun x =>
let '(a,t,s) := x in pass (ret ((a,s),t))))
; pass := fun _ c => mkStateT (fun s => pass (bind (runStateT c s) (fun x =>
let '(a,t,s) := x in ret ((a,s),t))))
}.

Global Instance Exc_stateT T (MR : MonadExc T m) : MonadExc T stateT :=
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