--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/concepts/pr68434.C	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,21 @@
+// { dg-options "-std=c++17 -fconcepts" }
+
+template <class>
+concept bool C1 () {
+  return true;
+}
+
+template <class>
+concept bool C2 () {
+  return true;
+}
+
+template <class Expr>
+concept bool C3 () {
+  return requires (Expr expr) {
+      {expr}->C1;
+      {expr}->C2;
+  };
+}
+
+auto f (C3);