Accessing enum member attributes, throwing an "undefined identifier" error (at CT), if the attributes of the member are not first accessed in the scope which the attribute is defined in.

This code exemplifies the error:
```
import std;

template T(E) {
    pragma(msg, __traits(getAttributes, E.a));
    enum T = null;
}

void main() {
    class C {}
    enum E {
        @C a
    }
    ////pragma(msg, __traits(getAttributes, E.a));
    pragma(msg, T!E);
}
```

Uncommenting the commented out line, makes the error not happen.