ref: 47faa09b2507bdfb2e3dd983f9aeb1ab54b2f2ef dir: /lib/fileutil/tmpdir.myr/
use std pkg fileutil = const tmpdir : (-> byte[:]) ;; const tmpdir = { match std.getenv("TMPDIR") | `std.Some d: -> d | `std.None: -> "/tmp" ;; }