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Logs: liberachat/#haskell

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2026-04-22 09:29:42 × davl quits (~davl@207.154.228.18) (Ping timeout: 255 seconds)
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2026-04-22 10:22:25 → nmeum_ joins (~nmeum@barium.8pit.net)
2026-04-22 10:24:47 <nmeum_> I have a question regarding Control.Monad.Catch: I do exception handling via `catch` in the context of a stateful monad `m`, in the exception handler `(e -> m a)` I want to access information about the state of my monad in which the exception occured. however, the exception handler action is executed in the state of the `catch` caller. how do access the error `m` state?
2026-04-22 10:24:50 nmeum_ is now known as nmeum
2026-04-22 10:43:11 <mauke> ski: and don't forget YAML
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2026-04-22 10:57:43 <merijn> nmeum: You do not
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2026-04-22 10:58:24 <merijn> nmeum: Or rather, in that scenario you probably just want a Reader of an IORef/MVar to access the state
2026-04-22 11:00:03 <nmeum> hm, that would presuppose changing the entire internal state representation of my monad. I think I would rather throw a custom exception which also includes the state or something along those lines then
2026-04-22 11:02:14 <merijn> nmeum: The problem is that catch is effectively unwrapping/rewrapping the stack, and there's no general way to make e.g. `StateT` handler that
2026-04-22 11:04:00 <merijn> nmeum: i.e. imagine `StateT s (EitherT e IO) a`, it ends up doing `runStateT` + `runEitherT` to turn it into `IO (Either e (s, a))` and then rewrapping that. But if the EitherT (or MaybeT) early aborts you don't get a state to return.
2026-04-22 11:04:21 <nmeum> yea, makes sense
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2026-04-22 11:24:36 <ski> mm, YAML is unrelated
2026-04-22 11:24:53 <ski> @unmtl StateT s (EitherT e IO) a
2026-04-22 11:24:53 <lambdabot> s -> EitherT e IO (a, s)
2026-04-22 11:25:07 <ski> @unmtl StateT s (ExceptT e IO) a
2026-04-22 11:25:07 <lambdabot> s -> IO (Either e (a, s))
2026-04-22 11:25:38 <ski> @unmtl ExceptT e (StateT s IO) a
2026-04-22 11:25:38 <lambdabot> s -> IO (Either e a, s)
2026-04-22 11:26:28 <ski> @unmtl StateT s (MaybeT IO) a
2026-04-22 11:26:28 <lambdabot> s -> IO (Maybe (a, s))
2026-04-22 11:26:35 <ski> @unmtl MaybeT (StateT s IO) a
2026-04-22 11:26:36 <lambdabot> s -> IO (Maybe a, s)
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2026-04-22 16:25:22 <gentauro> .cabal files are YAML right?
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2026-04-22 16:26:00 <c_wraith> no
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