--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/cpp1y/lambda-generic-const10.C	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,24 @@
+// PR c++/82643
+// { dg-do compile { target c++14 } }
+
+int main()
+{
+  struct A {
+    constexpr int operator()() const { return 42; }
+  };
+
+  auto f = A();
+  constexpr auto x = f(); //ok, call constexpr const non-static method
+
+  [](auto const &f) {
+    constexpr auto x = f();	// { dg-error "" }
+  }(f);
+
+  [&]() {
+    constexpr auto x = f(); //ko, __closure is not a constant expression
+  };
+
+  [=]() {
+    constexpr auto x = f(); //same ko, __closure is not a constant expression
+  };
+}