[Haskell-cafe] Extensible Exceptions

[David F. Place]

Hi, All.

I am trying to understand the new exceptions package in base-4
Control.Exceptions.  The documentation for catchJust is the same as in
Control.OldException including this example:

result <- catchJust errorCalls thing_to_try handler

Control.OldException provides the predicate errorCalls, but the new one
does not.  I don't see how to write it.

Thanks for reading.

Cheers,
David