re PR c++/49156 ([C++0x] Error reporting routines re-entered)

	PR c++/49156
	* error.c (dump_template_bindings): Set processing_template_decl
	for a partial instantiation.

From-SVN: r174256

gcc/cp/ChangeLog

 2011-05-25  Jason Merrill  <jason@redhat.com>
 
+	PR c++/44944
+	PR c++/49156
+	* error.c (dump_template_bindings): Set processing_template_decl
+	for a partial instantiation.
+
 	PR c++/45401
 	* decl.c (grokdeclarator): Don't change type when adding rvalue ref
 	to another reference type.

gcc/cp/error.c

@@ -307,6 +307,7 @@ dump_template_bindings (tree parms, tree args, VEC(tree,gc)* typenames)
 
   FOR_EACH_VEC_ELT (tree, typenames, i, t)
     {
+      bool dependent = uses_template_parms (args);
       if (need_comma)
 	pp_separate_with_comma (cxx_pp);
       dump_type (t, TFF_PLAIN_IDENTIFIER);
@@ -314,7 +315,11 @@ dump_template_bindings (tree parms, tree args, VEC(tree,gc)* typenames)
       pp_equal (cxx_pp);
       pp_cxx_whitespace (cxx_pp);
       push_deferring_access_checks (dk_no_check);
+      if (dependent)
+	++processing_template_decl;
       t = tsubst (t, args, tf_none, NULL_TREE);
+      if (dependent)
+	--processing_template_decl;
       pop_deferring_access_checks ();
       /* Strip typedefs.  We can't just use TFF_CHASE_TYPEDEF because
 	 pp_simple_type_specifier doesn't know about it.  */

gcc/testsuite/ChangeLog

 2011-05-25  Jason Merrill  <jason@redhat.com>
 
+	* g++.dg/cpp0x/error4.C: New.
+
 	* g++.dg/cpp0x/rv-restrict.C: New.
 
 	* g++.dg/cpp0x/enum15.C: New.

gcc/testsuite/g++.dg/cpp0x/error4.C

+// PR c++/49156
+// { dg-options -std=c++0x }
+
+template<typename T> T declval();
+
+template<typename T>
+struct S {
+
+  template<typename U>
+    static U get(const volatile T&);
+
+  template<typename U>
+    static decltype(*declval<U>()) get(...);
+
+  typedef decltype(get<T>(declval<T>())) type; // { dg-error "no match" }
+};
+
+struct X { };
+
+S<X>::type x;
+
+// { dg-prune-output "note" }