C++ PATCH to tweak variadic126.C test (PR c++/88866)

[Jason Merrill]

On 1/15/19 1:27 PM, Marek Polacek wrote:
> This test was failing in c++2a because the error messages are different
> because we're now trying to parse braced-list in template-argument-list.
> 
> Tested on x86_64-linux, ok for trunk?
> 
> 2019-01-15  Marek Polacek  <polacek@redhat.com>
> 
> 	PR c++/88866
> 	* g++.dg/cpp0x/variadic126.C: Tweak dg-error.
> 
> diff --git gcc/testsuite/g++.dg/cpp0x/variadic126.C gcc/testsuite/g++.dg/cpp0x/variadic126.C
> index 513c7e54a07..a219309f058 100644
> --- gcc/testsuite/g++.dg/cpp0x/variadic126.C
> +++ gcc/testsuite/g++.dg/cpp0x/variadic126.C
> @@ -3,6 +3,6 @@
>   
>   template < typename ... > struct A;
>   
> -struct B : A <			// { dg-error "invalid" }
> +struct B : A <			// { dg-error "invalid" "" { target c++17_down } }
>   {
> -};
> +}; // { dg-error "mismatch|expected" "" { target c++2a } }

OK.

Jason