Default Delegate Parameter

[Jesse Phillips]

For the following code I get the bellow error. I'm wondering if I should be 
reporting a bug, or if creating default delegates is correctly prevented?

.\defltdg.d(10): Error: delegate defltdg.__dgliteral3 is a nested function and 
cannot be accessed from main

import std.stdio;

void main() {
   take(() {writeln("Hello world");});
   take(() {});
   take();
}


void take(void delegate() dg = () {}) {
   dg();
}