static void Main(string[] args)
{
var sw = new Stopwatch();
sw.Start();
var parser = new Parser();
var rootAST = parser.ParseProgramAsync("src/hello.ryu").Result;
var symTableManager = new SymbolTableManager(rootAST);
symTableManager.GenerateSymbolTables();
var typeInferer = new TypeInferer(symTableManager);
var typeChecker = new TypeChecker(symTableManager);
var codeGen = new CodeGenVisitor(symTableManager);
typeInferer.InferTypes();
typeChecker.TypeCheck();
codeGen.CodeGen();
sw.Stop();
Console.WriteLine(sw.ElapsedMilliseconds);
Console.ReadKey();
}