During an unwind operation, an exception may be raised, causing the invocation of handlers. This may occur, for example, if a handler that is invoked for the original unwind causes an exception to be raised in this context.
Unwinding may be implemented in several fashions, including removing each stack frame after its procedure is processed, and removing all of the procedures' frames only when the target invocation is reached. For this reason, if an exception is raised during unwinding, it is undefined whether handlers for unwound procedures are invoked for this exception.