Passing a module in a template parameter list to __traits(allMembers, module)

[Ben Gertzfield]

Hi folks,

In preparation for my upcoming talk at DConf 2013, I'm working on 
a compile-time dependency injection prototype for D.

I'd like part of public interface for this system to take a 
module at compile time, and return a list of the classes in that 
module. Something like:

string GetMembers(T)() {
  auto members = [__traits(allMembers, T)];
  return join(result, ", ");
}

If I pass a module to __traits(allMembers, foo.bar) outside a 
template parameter list, it works great, but as soon as I pass it 
through a template parameter list, I get an odd error:

Error: template instance GetMembers!(std) GetMembers!(std) does 
not match template declaration GetMembers(T)()

Here's the code I'm working on. Any thoughts on whether this is 
possible, and if so, what I'm doing wrong?

http://pastebin.com/BgZ67h8P

Thanks,

Ben