This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 112e. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.
It appears that the current specification of constant expressions in 7.7 [expr.const] pararaph 2 permits examples like
constexpr const char* p = "asdf"; constexpr char ch = p;
This seems unnecessarily complicated for both users and implementers. If subscripting were defined directly, rather than in terms of pointer arithmetic and indirection (see issue 1213), we could still support the obvious cases of things like
constexpr char ch2 = "asdf";
without requiring compilers and users to track the target of address-constant pointers and references.
Rationale (October, 2012):
CWG was comfortable with this implication of the current wording.