__traits with alias

[sigod via Digitalmars-d-learn]

void registerAll(alias module_)()
{
     foreach (m; __traits(derivedMembers, module_)) {
         regInner!(__traits(getMember, module_, m)); // compiles

         alias a = __traits(getMember, module_, m); // fails
         //Error: basic type expected, not __traits
         //Error: semicolon expected to close alias declaration
     }
}

void regInner(alias T)()
{
     // ...
}

Is this a bug or I've missed something?