1 Exception Handling
2 ------------------
3
4 An exception handler stack is defined such that when a try...except or
5 try...finally block is entered, a new handler is defined.
6
7 When an exception is raised, the program jumps to the most recently defined
8 handler. Inside the handler, the stack entry for the handler will be removed.
9
10 Depending on the nature of the handler and whether the exception is handled,
11 the program may jump to the next most recent handler, and so on.
12
13 If no handler is defined when an exception is raised or re-raised, the program
14 should terminate. This might be done by having a "handler #0" which explicitly
15 terminates the program.
