D语言不可变的变量

import std.stdio; 
import std.random; 

void main() { 
   int min = 1; 
   int max = 10; 

   immutable number = uniform(min, max + 1); 
   // cannot modify immutable expression number 
   // number = 34; 
   typeof(number) value = 100;  

   writeln(typeof(number).stringof, number); 
   writeln(typeof(value).stringof, value); 
}