Forward referencing functions in D

[wilcro]

The web page "Programming in D for C Programmers" 
(https://dlang.org/articles/ctod.html#forwardfunc) states that 
forward declarations are neither required nor permitted, and that 
the following construct is allowable:

void myfunc()
{
     forwardfunc();
}

void forwardfunc()
{
     ... //do stuff
}


However, the following code will cause a compiler error:

import std.stdio: writeln;

void main()
{

     void myfunc() {

         forwardfunc(); // onlineapp.d(8): Error: undefined 
identifier forwardfunc
     }

     void forwardfunc() {

         writeln("foo");
     }

     myfunc();

}


Evidently, I am misunderstanding something very elemental here; 
thanks for any enlightenment regarding this.