C++ PATCH to fix eb82.C

[Marek Polacek]

I noticed this test fails in c++2a since the implementation of P0846
landed in r265734.  Since it's in g++.old-deja/, I never noticted the
fail (but I don't see any others).  This patch tweaks a dg-error in
order to make it pass in c++2a also.

Tested on x86_64-linux, ok for trunk?

2019-02-16  Marek Polacek  <pola...@redhat.com>

        * g++.old-deja/g++.robertl/eb82.C: Tweak dg-error.

diff --git gcc/testsuite/g++.old-deja/g++.robertl/eb82.C 
gcc/testsuite/g++.old-deja/g++.robertl/eb82.C
index 9bf0398cd0a..fc2bf7866fe 100644
--- gcc/testsuite/g++.old-deja/g++.robertl/eb82.C
+++ gcc/testsuite/g++.old-deja/g++.robertl/eb82.C
@@ -9,5 +9,5 @@ double val <int> () // { dg-error "" } bogus code
 
 int main ()
 {
-   printf ("%d\n", val<(int)3> ()); // { dg-error "" } val undeclared
+   printf ("%d\n", val<(int)3> ()); // { dg-error "" "" { target c++17_down } 
} val undeclared
 }