On Sun, Dec 20, 2020 at 06:57:34PM +0100, Zelphir Kaltstahl wrote: > Hello Tomas! > > I think you are right about it only being down one stack frame down. The > checks are performed on what contains the next thing which is recurred on.
Nice explanation :) > For a moment I thought "But isn't the null? check done twice in the > first cond part?" [...] This is one of the fantastic (and scary) things I often experience in this (scheme-y) context (take SICP, or the Little Schemer). Everything looks so easy, but whenever I try myself, I realise that I've been taken along a path along high mountains, with breathtaking views, and down there it gets messy and there are crocodiles. It takes a long time to massage one's messy, lowly programs into a form which approaches that deep beauty. But it's fun :) Cheers - t
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