re PR c++/49229 ([C++0x][SFINAE] ICE with variadics and depending non-type default parameter)

	PR c++/49229
	* pt.c (tsubst_decl) [FUNCTION_DECL]: Handle substitution failure.

From-SVN: r175120

gcc/cp/ChangeLog

 2011-06-16  Jason Merrill  <jason@redhat.com>
 
+	PR c++/49229
+	* pt.c (tsubst_decl) [FUNCTION_DECL]: Handle substitution failure.
+
 	PR c++/49251
 	* semantics.c (finish_id_expression): Mark even dependent
 	variables as used.

gcc/cp/pt.c

@@ -9548,6 +9548,8 @@ tsubst_decl (tree t, tree args, tsubst_flags_t complain)
                                           (DECL_TEMPLATE_RESULT
                                                  (DECL_TI_TEMPLATE (t))),
 					   args, complain, in_decl);
+	    if (argvec == error_mark_node)
+	      RETURN (error_mark_node);
 
 	    /* Check to see if we already have this specialization.  */
 	    hash = hash_tmpl_and_args (gen_tmpl, argvec);

gcc/testsuite/ChangeLog

 2011-06-16  Jason Merrill  <jason@redhat.com>
 
+	PR c++/49229
+	* g++.dg/cpp0x/sfinae26.C: New.
+
 	PR c++/49251
 	* g++.dg/cpp0x/variadic113.C: New.
 

gcc/testsuite/g++.dg/cpp0x/sfinae26.C

+// PR c++/49229
+// { dg-options -std=c++0x }
+
+extern void* enabler;
+
+template<bool, class = void>
+struct enable_if {};
+
+template<class T>
+struct enable_if<true, T> {
+  typedef T type;
+};
+
+template<class... Bn>
+struct and_;
+
+template<class B1>
+struct and_<B1> : B1 {};
+
+template<class, class>
+struct is_same {
+  static constexpr bool value = false;
+};
+
+template<class T>
+struct is_same<T, T> {
+  static constexpr bool value = true;
+};
+
+template<class... T>
+struct S {
+  template<class... U,
+    typename enable_if<and_<is_same<T, U>...>::value>::type*& = enabler
+  >
+  S(U...){} // #
+};
+
+S<bool> s(0);			// { dg-error "no match" }