anchor.diff:   : DecimalLiteral
    | HexIntegerLiteral
    | OctalIntegerLiteral
  - ;
  -
  -identifierName
  - : Identifier
  - | reservedWord
    ;
   
   reservedWord
  
positive.code: /// VariableStatement :
  ///     var VariableDeclarationList ;
  variableStatement
   : Var variableDeclarationList eos
   ;
  
  /// VariableDeclarationList :
  
negative.code: ///     RelationalExpression > ShiftExpression
  ///     RelationalExpression <= ShiftExpression
  ///     RelationalExpression >= ShiftExpression
  ///     RelationalExpression instanceof ShiftExpression
  ///     RelationalExpression in ShiftExpression
  ///
  /// ShiftExpression :
  