It seems like `std.algorithm.each` is not executed in the example below. Could anyone tell why? Thank you. import std.algorithm; void main(string[] args) { int[] arr = [1, 2, 3, 4, 5]; arr.each!((ref e) => { writeln(e); // does not print ++e; })(); writeln(arr); // prints [1, 2, 3, 4, 5] }