anchor.diff:  
   /// Made public for testing.
   String substitute(String source, values) => _substitute(source, values);
  -String formatValue(value, String type) => _formatValue(value, type);+String formatValue(value, String type) => _formatValue(value, type);
  
positive.code: import 'package:crypto/crypto.dart';
  import 'dart:io';
  import 'dart:convert';
  
  part 'buffer.dart';
  part 'connection.dart';
  
negative.code: ///        .single
  ///        .then((row) => print(row.my_field));
  ///
  @proxy
  abstract class Row {
    operator[] (int i);
    void forEach(void f(String columnName, columnValue));
  