anchor.diff:  }
   
   /// Exception thrown when looking up the build for a commit failed.
  -class CommitNotBuiltException implements Exception {
  +class NoResultsForCommitException implements Exception {
     final String reason;
   
  -  CommitNotBuiltException(this.reason);
  +  NoResultsForCommitException(this.reason);
   
     String toString() => reason;
   }
  
positive.code:   client.close();
    var builds = object["builds"] as List<dynamic>;
    if (builds == null || builds.isEmpty) {
      throw CommitNotBuiltException(
          "Builder $builder hasn't built commit $commit");
    }
    var build = builds.last;
  
negative.code:             "Warning: Searching for inexact baseline build: $e, continuing...");
        }
      }
      throw NoResultsForCommitException(
          "Failed to locate approximate baseline results for "
          "$commit in past $limit commits");
    }
  