1 files changed, 17 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/cpp0x/pr57981.C b/gcc/testsuite/g++.dg/cpp0x/pr57981.C
new file mode 100644
index 00000000000..5ee1f0ed6ff
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/pr57981.C
@@ -0,0 +1,17 @@
+// { dg-options "-std=c++11 -Wall -Wextra" }
+
+template<class T>
+void f(T t, void* = 0)  // { dg-warning "unused parameter" }
+{
+}
+
+template<class T>
+auto g(T t) -> decltype(f(t))
+{
+  f(t);
+}
+
+int main()
+{
+  g(0);
+}