--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/cpp0x/Wunused-variable-1.C	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,37 @@
+// PR c++/71442
+// { dg-do compile { target c++11 } }
+// { dg-options "-Wunused-variable" }
+
+struct C
+{
+  template<typename... Ts>
+  int operator()(Ts &&...)
+  {
+    return sizeof...(Ts);
+  }
+};
+
+int
+foo ()
+{
+  C {} (1, 1L, 1LL, 1.0);
+}
+
+template<int N>
+void
+bar ()
+{
+  char a;		// { dg-warning "unused variable" }
+  short b;		// { dg-warning "unused variable" }
+  int c;		// { dg-warning "unused variable" }
+  long d;		// { dg-warning "unused variable" }
+  long long e;		// { dg-warning "unused variable" }
+  float f;		// { dg-warning "unused variable" }
+  double g;		// { dg-warning "unused variable" }
+}
+
+void
+baz ()
+{
+  bar <0> ();
+}