https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66879
--- Comment #7 from Anders Granlund <anders.granlund.0 at gmail dot com> ---
(In reply to Jonathan Wakely from comment #4)
> So confirming as accepts-invalid with this testcase:
>
> class A;
>
> namespace Y {
> using ::A;
> class A { };
> }
Here are two similar test cases pulled in from my related bug reports (i have
marked them as resolved duplicates).
The following ill-formed programs are also accepted by gcc:
namespace R { struct f; }
namespace S { using R::f; }
struct S::f {};
int main() {}
The above is ill-formed by [dcl.meaning]p1 (
http://eel.is/c++draft/dcl.meaning#1 )
namespace P { struct S; }
namespace R { using namespace P; }
struct R::S {};
int main() {}
The above is also ill-formed by [dcl.meaning]p1
In general redeclarations must be done directly and not indirectly.
