message: add a test for excluding tests on miri
diff: @@ -9,3 +9,11 @@ fn bar() {
  fn baz() {
  assert_eq!(5, 5);
  }
  +
  +// A test that won't work on miri
  +#[cfg(not(feature = "cargo-miri"))]
  +#[test]
  +fn does_not_work_on_miri() {
  + let x = 0u8;
  + assert!(&x as *const _ as usize % 4 < 4);
  +}
  