D语言TypeTuple

import std.stdio; 
import std.typecons; 
import std.typetuple; 

alias TypeTuple!(int, long) TL;  

void method1(int a, string b, float c, char d) { 
   writeln("method 1 ",a,"/t",b,"/t",c,"/t",d); 
} 

void method2(TL tl) { 
   writeln(tl[0],"/t", tl[1] ); 
} 

void main() { 
   auto arguments = TypeTuple!(5, "my string", 3.3,'r');  
   method1(arguments); 
   method2(5, 6L);  
}