anchor.diff:    }
   }
   
  -/**
  - * A floating point literal expression.
  - *
  - *    doubleLiteral ::=
  - *        decimalDigit+ ('.' decimalDigit*)? exponent?
  - *      | '.' decimalDigit+ exponent?
  - *
  - *    exponent ::=
  - *        ('e' | 'E') ('+' | '-')? decimalDigit+
  - */
  +/// A floating point literal expression.
  +///
  +///    doubleLiteral ::=
  +///        decimalDigit+ ('.' decimalDigit*)? exponent?
  +///      | '.' decimalDigit+ exponent?
  +///
  +///    exponent ::=
  +///        ('e' | 'E') ('+' | '-')? decimalDigit+
   class DoubleLiteralImpl extends LiteralImpl implements DoubleLiteral {
  -  /**
  -   * The token representing the literal.
  -   */
  +  /// The token representing the literal.
     @override
     Token literal;
   
  -  /**
  -   * The value of the literal.
  -   */
  +  /// The value of the literal.
     @override
     double value;
   
  -  /**
  -   * Initialize a newly created floating point literal.
  -   */
  +  /// Initialize a newly created floating point literal.
     DoubleLiteralImpl(this.literal, this.value);
   
     @override
  
positive.code:   }
  }
  
  /**
   * The declaration of one or more top-level variables of the same type.
   *
   *    topLevelVariableDeclaration ::=
   *        ('final' | 'const') type? staticFinalDeclarationList ';'
   *      | variableDeclaration ';'
   */
  class TopLevelVariableDeclarationImpl extends CompilationUnitMemberImpl
      implements TopLevelVariableDeclaration {
    /**
     * The top-level variables being declared.
     */
    VariableDeclarationListImpl _variableList;
  
    /**
     * The semicolon terminating the declaration.
     */
    Token semicolon;
  
    /**
     * Initialize a newly created top-level variable declaration. Either or both
     * of the [comment] and [metadata] can be `null` if the variable does not have
     * the corresponding attribute.
     */
    TopLevelVariableDeclarationImpl(
        CommentImpl comment,
        List<Annotation> metadata,
  
negative.code:   @override
    DartType type;
  
    /// Initialize a newly created generic function type.
    GenericFunctionTypeImpl(TypeAnnotationImpl returnType, this.functionKeyword,
        TypeParameterListImpl typeParameters, FormalParameterListImpl parameters,
        {this.question}) {
  