Section 5.1.1.9 defines operator precedence but doesn't mention the new "has" operator that can be used to determine if an enumeration value contains a particular member.

Enums only support equality and comparison operators, so it probably doesn't make a lot of difference.

If we add it to Primary then::

Not style has Sales.Pattern'Yellow'

would be interpreted the same as::

Not (style has Sales.Pattern'Yellow')