Hi! I think this code should not be compiled without any warning: import std.stdio; void f(int a) { writeln("it's a function! : ", a); } void main() { auto f = function (int a) {writeln("It's a variable! : ", a);}; 5.f(); f(5); } Output: it's a function! : 5 It's a variable! : 5 WBR, Fyodor.