Plain chars within structs?

[gs]

The commentary for rule 6.1 and 6.2 states

The permissible operators on plain char types are the simple assignment operator (=), equality operators (==, !=) and explicit casts to integral types. Additionally, the second and third operands of the ternary conditional operator may both be of plain char type.

What about the '.' operator? Or the '->' operator? Could not an object of structure type contain a plain char member, making that member the second operand of the operator?

What about bit addressing or sizeof?