message: this oddly worked
diff: @@ -523,12 +523,13 @@ fn activate_deps_loop(
  }
  };
  - // If we're only here for the error messages then we know
  - // one of our candidate deps will fail, meaning we will
  - // fail and that none of the backtrack frames will find a
  + // If we're only here for the error messages
  + // and we did not use backtracking to explore our deps
  + // then we know one of our candidate deps will fail,
  + // meaning we will fail and that none of the backtrack frames will find a
  // candidate that will help. Consequently let's clean up the
  // no longer needed backtrack frames.
  - if activate_for_error_message {
  + if !backtracked && activate_for_error_message {
  backtrack_stack.clear();
  }
  