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Message: [QUOTE="Chris Angelico, post: 4223138"] The idea I was toying with was that it would have the source to X, so it knows that it calls Y. Unfortunately duck typing makes that difficult for anything where an object is passed in, but it's at least possible with simpler calls. The tool would be run on a snapshot of code. If you update the code, you rerun it. Again, not an issue if you don't expect it to be stable. You just look at how the code functions _now_. Yep. And because of duck typing, the information isn't really there. I think you're right that it's impossible. Right, but this tool would simply be useless then. Again, that would be a limitation of the tool. I'd prefer that it listed more exceptions than less. Yep. Agreed (except for the out-of-date qualifier), and that probably means this won't be of much use. But hey, it was an interesting thought experiment. ChrisA [/QUOTE]