Fix the constraints for any's assignment operator template to properly

reject assignment from a non-copyable lvalue.

From-SVN: r238365

libstdc++-v3/ChangeLog

+2016-07-14  Ville Voutilainen  <ville.voutilainen@gmail.com>
+
+	Fix the constraints for any's assignment operator template to properly
+	reject assignment from a non-copyable lvalue.
+	* include/std/any (operator=(_ValueType&&)): Constrain the decayed
+	type for is_copy_constructible,
+	* testsuite/20_util/any/requirements.cc: Add a test for
+	non-copyable lvalues.
+
 2016-07-14  Jonathan Wakely  <jwakely@redhat.com>
 
 	* include/experimental/functional: Include <parallel/algorithm> in

libstdc++-v3/include/std/any

@@ -238,9 +238,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     }
 
     /// Store a copy of @p __rhs as the contained object.
-    template<typename _ValueType>
-    enable_if_t<__and_<__not_<is_same<any, decay_t<_ValueType>>>,
-		       is_copy_constructible<_ValueType>>::value, any&>
+    template<typename _ValueType,
+	     typename _Tp = _Decay<_ValueType>>
+    enable_if_t<is_copy_constructible<_Tp>::value, any&>
       operator=(_ValueType&& __rhs)
       {
 	*this = any(std::forward<_ValueType>(__rhs));

libstdc++-v3/testsuite/20_util/any/requirements.cc

@@ -30,4 +30,7 @@ static_assert(std::is_assignable<any&, int>::value);
 static_assert(!std::is_assignable<any&, unique_ptr<int>>::value);
 static_assert(std::is_constructible<any, int>::value);
 static_assert(!std::is_constructible<any, unique_ptr<int>>::value);
-
+static_assert(!std::is_assignable<any&, const unique_ptr<int>&>::value);
+static_assert(!std::is_constructible<any&, const unique_ptr<int>&>::value);
+static_assert(!std::is_assignable<any&, unique_ptr<int>&>::value);
+static_assert(!std::is_constructible<any&, unique_ptr<int>&>::value);