message: Enable some fix tests on stable
diff: @@ -786,9 +786,6 @@ fn fix_all_targets_by_default() {
  #[test]
  fn prepare_for_and_enable() {
  - if !is_nightly() {
  - return;
  - }
  let p = project()
  .file(
  "Cargo.toml",
  @@ -905,9 +902,6 @@ fn idioms_2015_ok() {
  #[test]
  fn both_edition_migrate_flags() {
  - if !is_nightly() {
  - return;
  - }
  let p = project().file("src/lib.rs", "").build();
  let stderr = "\
  