--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/concepts/lambda1.C	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,32 @@
+// PR c++/82565
+// { dg-do compile { target c++14 } }
+// { dg-additional-options -fconcepts }
+
+struct string
+{
+  string();
+  string(const char *);
+  bool empty() const;
+};
+
+template<typename T, typename ReturnType>
+concept bool Concept() {
+  return requires(T t, const string& s) {
+    { t(s) } -> ReturnType;
+  };
+}
+
+struct test {
+  string _str;
+
+  template<typename Visitor>
+    requires Concept<Visitor, bool>()
+  decltype(auto) visit(Visitor&& visitor) const {
+    return visitor(_str);
+  }
+
+};
+
+int main() {
+  test().visit([] (auto& x) { return x.empty(); });
+}