D语言初始化关联数组

import std.stdio;

void main () { 
   int[string] days = 
      [ "Monday" : 0, 
        "Tuesday" : 1, 
        "Wednesday" : 2, 
        "Thursday" : 3, 
        "Friday" : 4, 
        "Saturday" : 5, 
        "Sunday" : 6 ]; 
   writeln(days["Tuesday"]);    
}