How an Engineering Company Chose to Migrate to D(dlang.org)

  fn main() {
      let a = 10;
  
      fn function() {
          println!("Hi!");
          // println!("a is {}", a)
          // fails with:
          //   can't capture dynamic environment in a fn item
          //   use the `|| { ... }` closure form instead
      }
    
      let borrow_closure = || println!("a is: {}", a);
      let move_closure = move || println!("a is still: {}", a);
    
      function();
      borrow_closure();
      move_closure();
  }

  void main()
  {
      static int nested(int x)
      {
          return x * 2;
      }

      struct Test
      {
          unittest
          {
              assert(nested(2) == 4);
          }
      }
  }