Metaclasses appear to be completely ignored

[davidchisnall]

In the most recent head (and possibly some earlier ones), even trivial examples fail. It appears that the metaclass definitions are not being applied at all. For example, in the interface example, adding an int to the interface does not generate an error; however, the Circle class that is a subclass of the interface generates the following two errors:

interface.cc:54:22: error: only virtual member functions can be marked 'override'
    int area() const override { return 1; }
                     ^~~~~~~~~
interface.cc:55:34: error: only virtual member functions can be marked 'override'
    void scale_by(double factor) override { }
                                 ^~~~~~~~~
2 errors generated.

It appears as if any metaclass name is treated as equivalent to class. This is compiling with -std=c++1z -Xclang -reflection. It appears that the metaclass definition is being parsed, but is then ignored.