Updates:
Status: WontFix
Labels: -Target-2.5.1
Comment #5 on issue 591 by pekka.klarck: Inheriting ExecutionFailed
exception without calling ExecutionFailed.__init__ crashes test execution
with RF 2.5
http://code.google.com/p/robotframework/issues/detail?id=591
The example library isn't actually valid (not calling __init__ is a bug)
even if it did work in RF 2.1.2. I don't actually see any reason a library
should use ExecutionFailed itself. Why isn't a normal exception enough?
Anyway, I really think we shouldn't do anything for this on RF side and
mark this WontFixed. Fixing this on the library is trivial and I don't
believe there are that many libraries out there that are affected.