error[E0752]: `#[start]` function is not allowed to be `async`
  --> $DIR/issue-68523-start.rs:6:1
   |
LL | pub async fn start(_: isize, _: *const *const u8) -> isize {
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `#[start]` is not allowed to be `async`

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0752`.