======= AST Display =========================
Package
  ClassDeclList [1]
  . ClassDecl
  .   "Test" classname
  .   FieldDeclList [0]
  .   MethodDeclList [1]
  .   . (public) MethodDecl
  .   .   VOID BaseType
  .   .   "p" methodname
  .   .   ParameterDeclList [0]
  .   .   StmtList [5]
  .   .   . AssignStmt
  .   .   .   IdRef
  .   .   .     "a" Identifier
  .   .   .   LiteralExpr
  .   .   .     "true" BooleanLiteral
  .   .   . AssignStmt
  .   .   .   IndexedRef
  .   .   .     RefExpr
  .   .   .       IdRef
  .   .   .         "b" Identifier
  .   .   .     IdRef
  .   .   .       "a" Identifier
  .   .   .   RefExpr
  .   .   .     IdRef
  .   .   .       "c" Identifier
  .   .   . CallStmt
  .   .   .   IdRef
  .   .   .     "p" Identifier
  .   .   .   ExprList [0]
  .   .   . AssignStmt
  .   .   .   IndexedRef
  .   .   .     LiteralExpr
  .   .   .       "3" IntLiteral
  .   .   .     QualifiedRef
  .   .   .       "b" Identifier
  .   .   .       IdRef
  .   .   .         "a" Identifier
  .   .   .   RefExpr
  .   .   .     IdRef
  .   .   .       "d" Identifier
  .   .   . CallStmt
  .   .   .   QualifiedRef
  .   .   .     "p" Identifier
  .   .   .     IdRef
  .   .   .       "c" Identifier
  .   .   .   ExprList [1]
  .   .   .   . RefExpr
  .   .   .   .   IdRef
  .   .   .   .     "e" Identifier
=============================================