message: Avoid Result::map_or for now
diff: @@ -8,7 +8,8 @@ fn main() {
  let ptr_width = env::var("CARGO_CFG_TARGET_POINTER_WIDTH");
  let u64_digit = ptr_width
  .as_ref()
  - .map_or(false, |x| x == "64" || x == "128");
  + .map(|x| x == "64" || x == "128")
  + .unwrap_or(false);
  if u64_digit {
  autocfg::emit("u64_digit");
  