Thanks for the feedback. Certainly there are lots of complicated concepts to learn in the macro system. On 4, if I run this program: https://gist.github.com/8f

Thanks for the feedback. Certainly there are lots of complicated concepts to learn in the macro system. On 4, if I run this program: https://gist.github.com/8fbc12877e2639c5f94c https://gist.github.com/8fbc12877e2639c5f94c I get a backtrace like this: [samth@huor:~] r ~/tmp/x.rkt /: contract violation expected: number? given: '(1 2 3 400 500 600) argument position: 2nd other arguments...: 6 context...: /home/samth/tmp/x.rkt: [running body] There's no other stack frames because `average` is inlined, but if you have more complicated functions you should get more stack frames.