re PR c++/64931 (ICE on function with deduced return type and input is instantiated template class)

2017-10-16  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/64931
	* g++.dg/cpp1y/auto-fn43.C: New.

From-SVN: r253788

gcc/testsuite/ChangeLog

+2017-10-16  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/64931
+	* g++.dg/cpp1y/auto-fn43.C: New.
+
 2017-10-16  Wilco Dijkstra  <wdijkstr@arm.com>
 
 	PR target/82442

gcc/testsuite/g++.dg/cpp1y/auto-fn43.C

+// PR c++/64931
+// { dg-do compile { target c++14 } }
+
+template<typename T>
+struct S {
+  T data[32];
+};
+
+auto
+foo (S<int> & x)
+{
+  return x;
+}