Read about it:
http://unroller.rubyforge.org/
http://github.com/TylerRick/unroller
Look at the photos!
Unfortunately, it is very outdated and not actively supported.
I wonder if there are any other tools like this that can show me which code was just executed, in which file, what was the result, and what was the return value?
It would be much better than manually tracing everything between a terminal and a bunch of Ruby files!
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