ref: d4f8f2a57a2d1b7adf6d9f45a1d3661cfd3d3d48 dir: /test/overlappingif.myr/
const main = { var v var x v = 0xff if v & 0xff00 != 0 x = 1 elif v & 0xfff0 != 0 x = 2 elif v & 0xffff != 0 x = 3 ;; -> x }