[Bug c++/101239] "Internal compiler error: Error reporting routines re-entered." in size_in_bytes_loc

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101239

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2021-06-28

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This slight variation using noexcept in the trailing-return-type was
rejects-valid in 4.7 but is ice-on-valid-code from 4.8 onwards (with the same
ICE):

template<typename T>
struct Blerk
{
  template<typename Ptr>
    static constexpr auto
    type(Ptr p = Ptr(), int n = 0)
    -> decltype(noexcept(p[n]))
    { return false; }

  template<typename Ptr>
    static constexpr int
    type(...)
    { return 1; }

  decltype(type<T*>()) f() const;
};

struct S;
extern Blerk<S[]> p;
auto s = p.f();
struct S { };