Concurrent actions that may fail with a value.

A version of the async package's Control.Concurrent.Async.Concurrently for which the actions may fail with a value.

conceit

A version of the Concurrently Applicative from Simon Marlow's async package, with the difference that the concurrent computation stops if any of the actions returns a Left value, not only in the case of exceptions.

The internals have been copied wholesale from Concurrently, with modifications to support the new behaviour.

Includes a useful Bifunctor instance.