Open martin-henz opened 3 weeks ago
https://share.sourceacademy.org/vwwjn
The arrow should point to the first pair of xs, not between the first and the second pair.
const append = (xs, ys) => is_null(xs) ? ys : pair(head(xs), append(tail(xs), ys)); append(list(1,2), list(3));
For reference: it is step number 29 out of 69 (and seems to be only affecting step 29)
https://share.sourceacademy.org/vwwjn
The arrow should point to the first pair of xs, not between the first and the second pair.