Renaming enum type doesn't work with NS_ENUM macro?

I have code formatted as below:

typedef NS_ENUM(NSUInteger, Foo) {
    DefaultFoo = 0,
    FirstFoo,
    SecondFoo
};

When I try to use rename refactoring on "Foo", nothing happens.  I tried with both the rename shortcut (Shift+F6) and the Selecting the Refactor->Rename...  menu item.  If I change the declaration style to:

typedef enum {
    DefaultFoo = 0,
    FirstFoo,
    SecondFoo
} Foo;

Then rename works correctly on Foo.

In both cases, the individual enum constants can be renamed without issue for me.

Does anyone know if this is a bug, or if there is in fact a way to get this working?

Thanks.