This module essentially provides a multi-level return. You can mark a spot with 'setjump()' and then unwind the stack back to that point from any nested stack frame by name using 'longjump()'. You can also provide a list of return values.

This is not quite a match for C's long jump, but it is "close enough". It is safer than C's jump in that it only lets you escape frames by going up the stack, you cannot jump in other ways.