Introspecting a package for submodules

[Anonymouse]

I have some modules, and then one `package.d` file that publicly 
imports them all. I have reason to access them individually 
however, with hopes of being able to enumerate them and 
introspect with `__traits(allMembers, someModule)`. Concretely, I 
want to express "find all module-level classes in all submodules 
of this package".

As an analogy, I have `std.algorithm` and I want to 
programmatically get `std.algorithm.comparison`, 
`std.algorithm.iteration`, `std.algorithm.mutation`, etc -- 
either as symbols or as strings.

`__traits(allMembers, std.algorithm)` evaluates to nothing, but 
replace it with `std.algorithm.searching` and it does.

How do I do this? (Is there some other way?)