re PR c++/65133 ([C++11] Result type deduction proceeds even though argument deduction fails)

2015-05-12  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/65133
	* g++.dg/cpp0x/trailing10.C: New.

From-SVN: r223047

gcc/testsuite/ChangeLog

+2015-05-12  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/65133
+	* g++.dg/cpp0x/trailing10.C: New.
+
 2015-05-12  Richard Biener  <rguenther@suse.de>
 
 	* gcc.dg/vect/bb-slp-35.c: New testcase.

gcc/testsuite/g++.dg/cpp0x/trailing10.C

+// PR c++/65133
+// { dg-do compile { target c++11 } }
+
+template<bool, typename Tp = void>
+struct enable_if { };
+
+template<typename Tp>
+struct enable_if<true, Tp> { typedef Tp type; };
+
+template <int I>
+struct count
+{
+  using type = typename count<I-1>::type;
+};
+
+template <>
+struct count<0>
+{
+  using type = void;
+};
+
+template <int I>
+auto foo(typename enable_if<(I>=0)>::type *
+	 = nullptr) -> typename count<I>::type { }
+
+template <int I>
+void foo(typename enable_if<(I<0)>::type * = nullptr) { }
+
+int main()
+{
+  foo<2>();
+  foo<-1>();
+}