anchor.diff:    static const CONVERT_TO_IF_ELEMENT = const AssistKind(
         'dart.assist.convertToIfElement', 30, "Convert to an 'if' element");
     static const CONVERT_TO_INT_LITERAL = const AssistKind(
  -      'dart.assist.convert.toIntLiteral', 30, "Convert to an int literal");
  +      'dart.assist.convert.toIntLiteral', 30, "Convert to an int literal",
  +      associatedErrorCodes: <String>['prefer_int_literals']);
     static const CONVERT_TO_LIST_LITERAL = const AssistKind(
  -      'dart.assist.convert.toListLiteral', 30, "Convert to list literal");
  +      'dart.assist.convert.toListLiteral', 30, "Convert to list literal",
  +      // todo (brianwilkerson): unify w/ fix
  +      associatedErrorCodes: <String>['prefer_collection_literals']);
     static const CONVERT_TO_MAP_LITERAL = const AssistKind(
  -      'dart.assist.convert.toMapLiteral', 30, "Convert to map literal");
  +      'dart.assist.convert.toMapLiteral', 30, "Convert to map literal",
  +      // todo (brianwilkerson): unify w/ fix
  +      associatedErrorCodes: <String>['prefer_collection_literals']);
     static const CONVERT_TO_MULTILINE_STRING = const AssistKind(
         'dart.assist.convert.toMultilineString',
         30,
  
positive.code:   static const JOIN_VARIABLE_DECLARATION = const AssistKind(
        'dart.assist.joinVariableDeclaration', 30, "Join variable declaration");
    static const REMOVE_TYPE_ANNOTATION = const AssistKind(
        'dart.assist.removeTypeAnnotation', 29, "Remove type annotation");
    static const REPLACE_CONDITIONAL_WITH_IF_ELSE = const AssistKind(
        'dart.assist.convert.conditionalToIfElse',
        30,
  
negative.code:       30,
        "Convert to normal parameter");
    static const CONVERT_TO_SET_LITERAL = const AssistKind(
        'dart.assist.convert.toSetLiteral', 30, "Convert to set literal",
        // todo (brianwilkerson): unify w/ fix
        associatedErrorCodes: <String>['prefer_collection_literals']);
    static const CONVERT_TO_SINGLE_QUOTED_STRING = const AssistKind(
        'dart.assist.convert.toSingleQuotedString',
        30,
  