message: fix tests broken by
diff: @@ -540,13 +540,16 @@ mod tests {
  }
  #[test]
  fn longest_key_length_works() {
  - let input = vec![("name", Raw("zaphod")), ("age", Raw(format!("{}", 42)))];
  + let input = vec![
  + ("name", Raw("zaphod".to_string())),
  + ("age", Raw(format!("{}", 42))),
  + ];
  assert_eq!(longest_key_length(&input), 4);
  }
  #[test]
  fn test_display_flat_pairs() {
  let input = Tree(vec![
  - ("name", Raw("zaphod")),
  + ("name", Raw("zaphod".to_string())),
  ("age", Raw(format!("{}", 42))),
  ]);
  assert_eq!(
  @@ -563,11 +566,11 @@ mod tests {
  (
  "character",
  Tree(vec![
  - ("name", Raw("zaphod")),
  + ("name", Raw("zaphod".to_string())),
  ("age", Raw(format!("{}", 42))),
  ]),
  ),
  - ("crook", Raw("yes")),
  + ("crook", Raw("yes".to_string())),
  ]);
  assert_eq!(
  format!("{}", input),
  @@ -585,21 +588,24 @@ mod tests {
  (
  "character",
  Tree(vec![
  - ("name", Raw("zaphod")),
  + ("name", Raw("zaphod".to_string())),
  ("age", Raw(format!("{}", 42))),
  ]),
  ),
  - ("crook", Raw("yes")),
  + ("crook", Raw("yes".to_string())),
  (
  "facts",
  List(vec![
  - Raw("invented pan-galactic gargle blaster"),
  - Raw("elected president"),
  + Raw("invented pan-galactic gargle blaster".to_string()),
  + Raw("elected president".to_string()),
  Tree(vec![
  ("heads", Raw(format!("{}", 2))),
  ("arms", Raw(format!("{}", 3))),
  ]),
  - List(vec![Raw("stole the heart of gold"), Raw("one hoopy frood")]),
  + List(vec![
  + Raw("stole the heart of gold".to_string()),
  + Raw("one hoopy frood".to_string()),
  + ]),
  ]),
  ),
  ]);
  