[Haskell-cafe] ANN: asynchronous-exceptions

It is often useful to distinguish between synchronous and asynchronous exceptions. The common idiom is to run a user-supplied computation catching any synchronous exceptions but allowing asynchronous exceptions (such as user interrupt) pass through. base 4.7 (shipped with GHC 7.8) will have SomeAsyncException type that solves this problem. asynchronous-exceptions is a new package that serves two purposes: * provide compatibility with older `base` versions that lack the `SomeAsyncException` type * define convenient functions for catching only synchronous exceptions Roman