message: Fix bad formating
diff: @@ -82,7 +82,8 @@ fn read_cargo_toml(path: &Path) -> Result<CargoManifest, Error> {
  return Error::crate_config(&format!(
  "Crate directory is missing a `Cargo.toml` file; is `{}` the wrong directory?",
  path.display()
  - )).map(|_| unreachable!());
  + ))
  + .map(|_| unreachable!());
  }
  let mut cargo_file = File::open(manifest_path)?;
  let mut cargo_contents = String::new();
  