return the other functions of the void main()

[Rikki Cattermole via Digitalmars-d-learn]

On 9/04/2015 11:03 p.m., Dennis Ritchie wrote:
> Hi,
> Is it allowed in D similar designs?
>
> void main() {
>      import std.stdio;
>      return writeln("Hello, world!");
> }

Sure when:

import std.traits : ReturnType;
import std.stdio : writeln;

static assert(is(ReturnType!writeln == int));