error: usage of `process::exit`
  --> $DIR/exit2.rs:4:5
   |
LL |     std::process::exit(3);
   |     ^^^^^^^^^^^^^^^^^^^^^
   |
   = note: `-D clippy::exit` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(clippy::exit)]`

error: aborting due to 1 previous error