[Voted into the WP at the November, 2010 meeting.]

Proposed resolution (August, 2010):

Change the example in 6.7.4 [basic.life] paragraph 9 as follows:

    ...
    new (const_cast<B *>(&b)) const B;  // undefined behavior
    ...

The example in 6.7.4 [basic.life] paragraph 9 reads,

    struct B {
      B();
      ~B();
    };

    const B b;

    void h() {
      b.~B();
      new (&b) const B;  // undefined behavior
    }

Assuming that the placement new is intended to use the operator defined in the Standard library, the new-expression is ill-formed, because there is no implicit conversion from “pointer to const B” to void*.