error[E0647]: `#[start]` function is not allowed to have a `where` clause
  --> $DIR/E0647.rs:7:50
   |
LL | fn start(_: isize, _: *const *const u8) -> isize where (): Copy {
   |                                                  ^^^^^^^^^^^^^^ `#[start]` function cannot have a `where` clause

error: aborting due to previous error

For more information about this error, try `rustc --explain E0647`.