https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64335

            Bug ID: 64335
           Summary: decltype and access of a private member type
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Keywords: accepts-invalid
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ville.voutilainen at gmail dot com

This compiles fine:

#include <chrono>

class foo { std::chrono::high_resolution_clock clock;};

static_assert(!decltype(foo::clock)::is_steady, "xxx");

This doesn't:

class foo {
    class bar {typedef int foo;};
};

int main()
{
    decltype (foo::bar) y;
}

Clang rejects both.

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