c++: add fixed test [PR66878]

Fixed by r11-175.

	PR c++/66878

gcc/testsuite/ChangeLog:

	* g++.dg/lookup/using71.C: New test.

diff --git a/gcc/testsuite/g++.dg/lookup/using71.C b/gcc/testsuite/g++.dg/lookup/using71.C
new file mode 100644 (file)
index 0000000..b899e0a
--- /dev/null
+++ b/gcc/testsuite/g++.dg/lookup/using71.C
@@ -0,0 +1,12 @@
+// PR c++/66878
+
+struct S;
+
+namespace H {
+    namespace P {
+        using ::S;
+    }
+    struct P::S {};
+}
+
+int main() {}