Reflection

[Joshua Niehus]

Hello,

I dont understand the following snippet's output:
import std.stdio, std.traits;
void main() {
    writeln(isSomeFunction!(writeln));
    writeln(isCallable!(writeln));
    writeln("Yes I am...");
}

/* OUTPUT */
false
false
Yes I am...

If 'writeln' isn't a method/function and it's not callable, then 
what is it?

Thanks,
Josh