re PR c++/55931 ([C++11] Constexpr member function inside a static member is not working)

	PR c++/55931
	* parser.c (cp_parser_template_argument): Don't
	fold_non_dependent_expr.

From-SVN: r196746

gcc/cp/ChangeLog

 2013-03-16  Jason Merrill  <jason@redhat.com>
 
+	PR c++/55931
+	* parser.c (cp_parser_template_argument): Don't
+	fold_non_dependent_expr.
+
 	* parser.c (cp_parser_lambda_declarator_opt): Use
 	cp_parser_trailing_type_id.
 

gcc/cp/parser.c

@@ -13335,7 +13335,6 @@ cp_parser_template_argument (cp_parser* parser)
   argument = cp_parser_constant_expression (parser,
 					    /*allow_non_constant_p=*/false,
 					    /*non_constant_p=*/NULL);
-  argument = fold_non_dependent_expr (argument);
   if (!maybe_type_id)
     return argument;
   if (!cp_parser_next_token_ends_template_argument_p (parser))

gcc/testsuite/g++.dg/cpp0x/constexpr-template4.C

+// PR c++/55931
+// { dg-do compile { target c++11 } }
+
+#include <type_traits>
+
+template<typename Type>
+class Test
+{
+    public:
+        constexpr Test(const Type val) : _value(val) {}
+        constexpr Type get() const {return _value;}
+        static void test()
+        {
+            static constexpr Test<int> x(42);
+            std::integral_constant<int, x.get()> i; // This is not working
+        }
+    protected:
+        Type _value;
+};
+
+int main()
+{
+    static constexpr Test<int> x(42);
+    std::integral_constant<int, x.get()> i; // This is working
+    Test<double>::test();
+}