re PR c++/71368 ([concepts] ICE on constrained compound requirement)

2017-10-17  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/71368
	* g++.dg/concepts/pr71368.C: New.

From-SVN: r253826

gcc/testsuite/ChangeLog

+2017-10-17  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/71368
+	* g++.dg/concepts/pr71368.C: New.
+
 2017-10-17  Nathan Sidwell  <nathan@acm.org>
 
 	PR c++/82560

gcc/testsuite/g++.dg/concepts/pr71368.C

+// { dg-options "-std=c++17 -fconcepts" }
+
+struct inner;
+
+template<typename X> concept bool CompoundReq = requires {
+    // fine with concrete type in trailing type, i.e. inner& instead of X&
+    { X::inner_member() } -> X&;
+};
+
+template<typename X> concept bool Concept = requires {
+    { X::outer_member() } -> CompoundReq;
+};
+
+struct inner { static inner& inner_member(); };
+struct outer { static inner outer_member(); };
+
+int main()
+{
+    // fine
+    static_assert( CompoundReq<inner> );
+    static_assert( CompoundReq<decltype( outer::outer_member() )> );
+
+    // ICE
+    static_assert( Concept<outer> );
+}