[Bug c++/51878] ICE or OOM with decltype + variadic templates + "indirect" function call

["paolo.carlini at oracle dot com" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51878

Paolo Carlini <paolo.carlini at oracle dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jason at gcc dot gnu.org

--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> 2012-01-17 11:28:43 UTC ---
If I apply the below patchlet (parts of it are probably sane changes anyway) I
see a clean ICE with template instantiation depth exceeded. Then I wonder if
modulo the small tweaks we have just a duplicate of, eg, PR51304.

Maybe Jason can help triaging... (thanks in advance)

//////////////////

Index: error.c
===================================================================
--- error.c    (revision 183238)
+++ error.c    (working copy)
@@ -2471,6 +2471,10 @@ dump_expr (tree t, int flags)
       dump_expr (resolve_virtual_fun_from_obj_type_ref (t), flags);
       break;

+    case NONTYPE_ARGUMENT_PACK:
+      dump_template_argument (t, flags);
+      break;
+
       /*  This list is incomplete, but should suffice for now.
       It is very important that `sorry' does not call
       `report_error_function'.  That could cause an infinite loop.  */
Index: mangle.c
===================================================================
--- mangle.c    (revision 183238)
+++ mangle.c    (working copy)
@@ -2319,6 +2319,9 @@ write_bare_function_type (const tree type, const i
 {
   int java_method_p;

+  if (type == error_mark_node)
+    return;
+
   MANGLE_TRACE_TREE ("bare-function-type", type);

   /* Detect Java methods and emit special encoding.  */