error: functions using `#[should_panic]` must return `()`
  --> $DIR/termination-trait-in-test-should-panic.rs:11:1
   |
LL | / fn not_a_num() -> Result<(), ParseIntError> {
LL | |
LL | |     let _: u32 = "abc".parse()?;
LL | |     Ok(())
LL | | }
   | |_^

error: aborting due to previous error