>Add a 'depth' operation that returns the depth of the user stack. If >the name bothers anyone, feel free to rename it. (Some might call it >the 'height' of the stack, for instance.)
Since you mentioned it... How about a set of ops that does complete environment save/restore. I suppose this would be similar to C-s setjmp/longjmp or some variation of non-local goto. I can see several uses for this atomic operation or variations thereof, including threading implemented in Parrot, exceptions, and possibly continuations. -Melvin
