Cannot dup an associative array but why?

[Jean-Louis Leroy via Digitalmars-d-learn]

On Tuesday, 11 July 2017 at 21:23:28 UTC, Ali Çehreli wrote:
> Default template and function arguments are resolved at 
> instantiation site, which means __MODULE__ would resolve 
> automatically to the caller's module. For example, if you have 
> this module:

__MODULE__ is a string so I cannot pass it to 
__traits(allMembers). I worked around it via a string mixin that 
creates an alias for the module:

template RegisterMethods()
{
   import std.array;
   mixin("alias MODULE = " ~ __MODULE__ ~ ";");
   auto RegisterMethods() {
     string[] s;
     foreach (m; __traits(allMembers, MODULE)) {
       // do stuff
     }
     return join(s, "");
   }
}

mixin(RegisterMethods);

I wonder if there is a better way.

Also, I am using the outer string mixin (as opposed to a plain 
mixin) because I will need to produce a series of aliases:

mixin(RegisterMethods);
// injects:
// alias add = Method!("add", Matrix, virtual!Matrix, 
virtual!Matrix).dispatcher
// alias add = Method!("add", Matrix, virtual!Matrix, 
virtual!Matrix).discriminator;
// alias kick = Method!("kick", Animal).dispatcher
// alias kick = Method!("kick", Animal).discriminator
// etc

The only way I can see is with a string mixin.

I thought about the new syntax since yesterday, and hit some 
problems and some solutions. At this point maybe we should 
continue that discussion elsewhere than the Learn forum...