ref: f9f93d1e447873ca3e5fa6c542eb34e8dd8d4b71 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" ;; }