Macroify: nth

[lilactown]

nth should emit code the same as unchecked-get:

(nth [1 2 3] 2)

([1, 2, 3][2])

[lilactown]

This is actually a little trickier than I originally thought. The issue is that nth in Clojure supports nil, which we need for safe destructuring:

(let [[foo bar] nil]
  foo)

Is a perfectly valid bit of code, but would fail if we translated it to

(function () {
  let foo = null[0];
  let bar = null[1];
  return foo;
})()

[borkdude]

Yeah, maybe this isn't worth the risk of breakage. I'll close this for now.