--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/ext/attrib61.C	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,26 @@
+// PR c++/92438
+// { dg-do compile }
+
+typedef struct S { int x; } T;
+T (foo) (T x);
+T __attribute__((unused)) bar (T x);
+struct S (__attribute__((unused)) baz) (T x);
+T (__attribute__((unused)) qux) (T x);
+
+struct U
+{
+  U (__attribute__((unused)) int);
+  U (__attribute__((unused)) corge) (int);
+};
+
+void
+test ()
+{
+  T a, b;
+  a = foo (b);
+  b = bar (a);
+  a = baz (b);
+  b = qux (a);
+  U u (5);
+  U v = u.corge (3);
+}