Proposed resolution (August, 2017):

Change 9.7 [dcl.struct.bind] paragraph 3 as follows:

Otherwise, if the qualified-id std::tuple_size<E> names a complete type, the expression std::tuple_size<E>::value shall be a well-formed integral constant expression and the number of elements in the identifier-list shall be equal to the value of that expression. The unqualified-id get is looked up in the scope of E by class member access lookup (_N4868_.6.5.6 [basic.lookup.classref]), and if that finds at least one declaration, the initializer is e.get<i>(). Otherwise, the initializer is get<i>(e) where get is looked up in the associated namespaces (6.5.4 [basic.lookup.argdep]). In either case, get<i> is interpreted as a template-id. [Note: Ordinary unqualified lookup (6.5.3 [basic.lookup.unqual]) is not performed. —end note] In either case, e is an lvalue if the type of the entity e is an lvalue reference and an xvalue otherwise. Given the type T_i designated by std::tuple_element<i, E>::type , each v_i is a variable variables are introduced with unique names r_i of type “reference to T_i ” initialized with the initializer (9.5.4 [dcl.init.ref]), where the reference is an lvalue reference if the initializer is an lvalue and an rvalue reference otherwise. Each v_i is the name of an lvalue of type T_i that refers to the object bound to r_i; the referenced type is T_i.