Be aware that "passing through" of asynchronous exceptions is not really
possible. There simply is no way to selectively catch an exception -- one
must always catch and rethrow, thus turning asynchronous exceptions into
synchronous exceptions. See http://www.edsko.net/2013/06/11/throwto/ for
details.
Edsko
On Wed, Feb 5, 2014 at 11:23 AM, Roman Cheplyaka
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
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