[Moved to DR at 10/01 meeting.]

Proposed resolution:

Change text in 6.6 [basic.link] paragraph 5 from:

In addition, a member function, static data member, class or enumeration of class scope has external linkage if the name of the class has external linkage.

In addition, a member function, a static data member, a named class or enumeration of class scope, or an unnamed class or enumeration defined in a class-scope typedef declaration such that the class or enumeration has the typedef name for linkage purposes (9.2.4 [dcl.typedef]), has external linkage if the name of the class has external linkage.

A name having namespace scope has external linkage if it is the name of

• [...]
• a named enumeration (9.7.1 [dcl.enum]), or an unnamed enumeration defined in a typedef declaration in which the enumeration has the typedef name for linkage purposes (9.2.4 [dcl.typedef])

    typedef enum { e1 } *PE;
    void f(PE) {}  // Cannot declare a function (with linkage) using a
		   // type with no linkage.

However, the same prohibition was not made for class scope types. Indeed, 6.6 [basic.link] paragraph 5 says:

In addition, a member function, static data member, class or enumeration of class scope has external linkage if the name of the class has external linkage.

That allows for:

    struct S {
       typedef enum { e1 } *MPE;
       void mf(MPE) {}
    };

My guess is that this is an unintentional consequence of 6.6 [basic.link] paragraph 5, but I would like confirmation on that.