anchor.diff:          } else {
             result[file][line] += cnt;
           }
  -      }); 
  +      });
       } else {
         result[file] = v;
       }
  
positive.code: /// env.output.
  ///
  /// Returns a [Future] that completes as soon as all map entries have been
  /// emitted. 
  Future lcov(Map hitmap) {
    var emitOne = (key) {
      var v = hitmap[key];
  
negative.code: 
    JSON.decode(rawJson).forEach((Map e) {
      String source = resolver.resolve(e["source"]);
      if (source == null) {
        // Couldnt resolve import, so skip this entry.
        return;
      }
  