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[Monads] Add a MonadException finaly function similar to the Haskell one #56

Open viboes opened 10 years ago

viboes commented 10 years ago

finally :: MonadCatch m => m a -> m b -> m a

Perform an action with a finalizer action that is run, even if an exception occurs.

https://hackage.haskell.org/package/base-4.7.0.0/docs/Control-Exception.html#v:finally