[C++ Patch] PR 50371

[Paolo Carlini]

Hi,

I have this patchlet for a simple C++11 rejects-valid, reported by 
Daniel. Tested x86_64-linux.

Ok for mainline?

Thanks,
Paolo.

////////////////////
/cp
2011-09-22  Paolo Carlini  <paolo.carl...@oracle.com>

        PR c++/50371
        * pt.c (invalid_nontype_parm_type_p): Handle NULLPTR_TYPE.

/testsuite
2011-09-22  Paolo Carlini  <paolo.carl...@oracle.com>

        PR c++/50371
        * g++.dg/cpp0x/nullptr24.C: New.
Index: testsuite/g++.dg/cpp0x/nullptr24.C
===================================================================
--- testsuite/g++.dg/cpp0x/nullptr24.C  (revision 0)
+++ testsuite/g++.dg/cpp0x/nullptr24.C  (revision 0)
@@ -0,0 +1,5 @@
+// PR c++/50371
+// { dg-options -std=c++0x }
+
+template<decltype(nullptr)>
+struct nt;
Index: cp/pt.c
===================================================================
--- cp/pt.c     (revision 179088)
+++ cp/pt.c     (working copy)
@@ -18717,6 +18717,8 @@ invalid_nontype_parm_type_p (tree type, tsubst_fla
     return 0;
   else if (TREE_CODE (type) == DECLTYPE_TYPE)
     return 0;
+  else if (TREE_CODE (type) == NULLPTR_TYPE)
+    return 0;
 
   if (complain & tf_error)
     error ("%q#T is not a valid type for a template constant parameter", type);