No Output with shebang.

[Newbie via Digitalmars-d-learn]

#!/usr/bin/gdc

import std.stdio;
void main()
{
     writeln("Hello, world with automated script running!");
}

When I compile the code above normal to an a.out binary it runs
like expected. But running it with shebang it does nothing. No
output, especially no error message. Nothing.

What do I wrong?