======= AST Display =========================
Package
  ClassDeclList [1]
  . ClassDecl
  .   "id" classname
  .   FieldDeclList [0]
  .   MethodDeclList [1]
  .   . (public) MethodDecl
  .   .   VOID BaseType
  .   .   "p" methodname
  .   .   ParameterDeclList [0]
  .   .   StmtList [1]
  .   .   . VarDeclStmt
  .   .   .   VarDecl
  .   .   .     INT BaseType
  .   .   .     "x" varname
  .   .   .   BinaryExpr
  .   .   .     "||" Operator
  .   .   .       BinaryExpr
  .   .   .         "&&" Operator
  .   .   .           BinaryExpr
  .   .   .             "!=" Operator
  .   .   .               BinaryExpr
  .   .   .                 "<=" Operator
  .   .   .                   BinaryExpr
  .   .   .                     "<" Operator
  .   .   .                       BinaryExpr
  .   .   .                         ">=" Operator
  .   .   .                           BinaryExpr
  .   .   .                             ">" Operator
  .   .   .                               BinaryExpr
  .   .   .                                 "+" Operator
  .   .   .                                   LiteralExpr
  .   .   .                                     "1" IntLiteral
  .   .   .                                   BinaryExpr
  .   .   .                                     "/" Operator
  .   .   .                                       BinaryExpr
  .   .   .                                         "*" Operator
  .   .   .                                           LiteralExpr
  .   .   .                                             "2" IntLiteral
  .   .   .                                           LiteralExpr
  .   .   .                                             "3" IntLiteral
  .   .   .                                       LiteralExpr
  .   .   .                                         "4" IntLiteral
  .   .   .                               LiteralExpr
  .   .   .                                 "5" IntLiteral
  .   .   .                           LiteralExpr
  .   .   .                             "6" IntLiteral
  .   .   .                       LiteralExpr
  .   .   .                         "7" IntLiteral
  .   .   .                   LiteralExpr
  .   .   .                     "8" IntLiteral
  .   .   .               LiteralExpr
  .   .   .                 "9" IntLiteral
  .   .   .           LiteralExpr
  .   .   .             "0" IntLiteral
  .   .   .       LiteralExpr
  .   .   .         "1" IntLiteral
=============================================