A class has a recursive routine `f' which at the depths of its
recursion calls a routine `weasel' which raises an exception.  Routine
`weasel' has a rescue clause which first calls `f' and then retries
and succeeds.  When the system is executed, it dies with a panic
(segmentation fault) if the depth of "exception in rescue clause"
nesting is greater than 256.

Discovered in Release 3.2.4.