Type after enum identifier not parsed in C++

[mantielero]

The following produces an error when parsed:

enum PositionCentering : uint8 {
   CenterX = 1,
   CenterY = 2,
   CenterZ = 4,
   CenterL = 8
};

where:

// unscoped enum:
enum [identifier] [: type]
{enum-list};

If : uint8is removed, it parses correctly.