anchor.diff:                astFactory.constructorName(typeName, null, null);
             InstanceCreationExpression instanceCreationExpression =
                 astFactory.instanceCreationExpression(
  -                  _getKeyword(node), constructorName, node.argumentList);
  +                  null, constructorName, node.argumentList);
             NodeReplacer.replace(node, instanceCreationExpression);
           } else if (prefixedElement is ExtensionElement) {
             PrefixedIdentifier extensionName =
  
positive.code:           // TODO(scheglov) I think we should drop "typeArguments" below.
            InstanceCreationExpression instanceCreationExpression =
                astFactory.instanceCreationExpression(
                    _getKeyword(node), constructorName, node.argumentList,
                    typeArguments: typeArguments);
            NodeReplacer.replace(node, instanceCreationExpression);
          }
  
negative.code:                 astFactory.constructorName(typeName, node.operator, methodName);
              InstanceCreationExpression instanceCreationExpression =
                  astFactory.instanceCreationExpression(
                      null, constructorName, node.argumentList);
              NodeReplacer.replace(node, instanceCreationExpression);
            }
          }
        }
      }
    }
  }
  