message: Test make_runtime_err
diff: @@ -168,6 +168,15 @@ mod test {
  }
  }
  + #[test]
  + fn make_runtime_err_works() {
  + let err = make_runtime_err("something went wrong");
  + match err {
  + VmError::RuntimeErr { msg, .. } => assert_eq!(msg, "something went wrong"),
  + _ => panic!("Unexpected error"),
  + }
  + }
  +
  #[test]
  fn make_uninitialized_context_data_works() {
  let err = make_uninitialized_context_data("foo");
  