e is evaluated just for its location. This includes
expressions that are used in a reference expression (
expressions that are used on the left side of an assignment,
and some non-expression types such as
For expressions, this is similar to, but different than,
e.(Expr).isLValue(), which holds if
e has an address.
This relation pervasively influences the interpretation of expressions throughout this module. An element evaluated for its lvalue is treated as evaluating to its location, not its value.