re PR c++/81299 (Spurious "set but not used" warning with constexpr variable)

2017-10-11  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/81299
	* g++.dg/cpp1y/lambda-generic-ice7.C: New.

From-SVN: r253630

gcc/testsuite/ChangeLog

+2017-10-11  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/81299
+	* g++.dg/cpp1y/lambda-generic-ice7.C: New.
+
 2017-10-10  Nathan Sidwell  <nathan@acm.org>
 
 	* g++.dg/lookup/extern-c-redecl6.C: New.

gcc/testsuite/g++.dg/cpp1y/lambda-generic-ice7.C

+// PR c++/81299
+// { dg-do compile { target c++14 } }
+// { dg-options "-Wall" }
+
+struct function_t {
+  template <typename ...Xs>
+  void operator()(Xs&& ...) const { }
+};
+constexpr function_t function{};
+
+int main() {
+  constexpr auto fun = ::function;
+  auto call = [=](auto ...x) { fun(x...); };
+  call();
+}