testsuite: Add test for already fixed PR [PR97804]

This testcase got fixed with the PR98463
r11-6895-g94ff4c9dd98f39280fba22d1ad0958fb25a5363b fix.

2021-02-03  Jakub Jelinek  <jakub@redhat.com>

	PR c++/97804
	* g++.dg/cpp2a/no_unique_address11.C: New test.

diff --git a/gcc/testsuite/g++.dg/cpp2a/no_unique_address11.C b/gcc/testsuite/g++.dg/cpp2a/no_unique_address11.C
new file mode 100644 (file)
index 0000000..9ca6184
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp2a/no_unique_address11.C
@@ -0,0 +1,18 @@
+// PR c++/97804
+// { dg-do compile { target c++17 } }
+
+template <typename a> struct b {
+  constexpr b() : c() {}
+  [[no_unique_address]] a c;
+};
+template <unsigned long, typename...> struct d;
+template <unsigned long e, typename a, typename... f>
+struct d<e, a, f...> : d<1, f...>, b<a> {};
+template <unsigned long e, typename a> struct d<e, a> : b<a> {};
+template <typename... g> class h : d<0, g...> {};
+struct i {};
+class j {
+  using k = int;
+  h<k, i> l;
+  float m = 0.025f;
+} n;