Concurrent actions that may fail with a value.

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Stackage Nightly 2016-05-25:
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BSD-3-Clause licensed by Daniel Díaz Carrete
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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.