Thanks, I actually think i read this article back when it first came out. I think I will give it a read again. Thanks.

Update: I went back and tried with your Google search params, I noticed it was the first and pretty much only relevant link on there (except for something by chromatic which I have bookmarked for after the kids are in bed). Maybe I should start looking for info about the perl C code, and just transpose it to Perl?

1. Write the Perl code you want to produce.
2. Dump it to opcodes with B::Concise.
3. Write the Perl code you want to transform.
4. Dump it to opcodes.
5. Figure out the difference between #2 and #4.
6. Write the B::Generate code to produce those opcodes.
7. Fiddle with stuff until it stops segfaulting.
8. Fiddle with stuff until it stops running into an infinite loop.

For extra credit, fiddle with stuff until it produces the right answer. If you reach this step, please tell the rest of us how you did it!