Two correctness bugs found while migrating:
- nthrest returned nil where Clojure returns () : for n>0 the walk yields
(seq xs) wrapped in (or ... ()), so an exhausted/nil walk is () not nil
(only n<=0 returns coll). Both the prior Janet impl and the first overlay
port got this wrong. nthrest.cljc 13/1/0 -> 14/0/0.
- if-let/when-let/if-some/when-some leaked their binding into the else branch:
they wrapped the whole if in (let* [name val] ...), so (let [x 5] (if-let
[x nil] x x)) returned nil instead of 5. Fixed to bind a fresh temp around the
if and rebind the name only inside the taken branch, matching Clojure.
conformance 218/218 x3, clojure-test-suite 3928 -> 3929.
f22eb660d3