anchor.diff:          identical(value3, stringValue);
     }
   
  -  /// Returns true if the stringValue of the [token] is either [value1],
  +  /// Returns `true` if the stringValue of the [token] is either [value1],
     /// [value2], [value3], or [value4].
     bool isOneOf4(
         Token token, String value1, String value2, String value3, String value4) {
  
positive.code:     return tryParseMethodTypeArguments(token) != null;
    }
  
    Token parseQualified(Token token, IdentifierContext context,
        IdentifierContext continuationContext) {
      token = parseIdentifier(token, context);
  
negative.code:     return semicolon.next;
    }
  
    /// combinators:
    ///   (hideCombinator | showCombinator)*
    /// ;
    Token parseCombinators(Token token) {
      listener.beginCombinators(token);
      int count = 0;
  