re PR c++/53305 (internal crash with variadic templates and decltype)

/cp
2012-05-11  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/53305
	* pt.c (tsubst_copy: case PARM_DECL): Return error_mark_node if
	tsubst_decl returns NULL_TREE.
	* cxx-pretty-print.c (pp_cxx_simple_type_specifier): Handle
	BOUND_TEMPLATE_TEMPLATE_PARM.

/testsuite
2012-05-11  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/53305
	* g++.dg/cpp0x/variadic132.C: New.

From-SVN: r187396

gcc/cp/ChangeLog

+2012-05-11  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/53305
+	* pt.c (tsubst_copy: case PARM_DECL): Return error_mark_node if
+	tsubst_decl returns NULL_TREE.
+	* cxx-pretty-print.c (pp_cxx_simple_type_specifier): Handle
+	BOUND_TEMPLATE_TEMPLATE_PARM.
+
 2012-05-10  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/53158

gcc/cp/cxx-pretty-print.c

@@ -1261,6 +1261,7 @@ pp_cxx_simple_type_specifier (cxx_pretty_printer *pp, tree t)
     case TEMPLATE_TYPE_PARM:
     case TEMPLATE_TEMPLATE_PARM:
     case TEMPLATE_PARM_INDEX:
+    case BOUND_TEMPLATE_TEMPLATE_PARM:
       pp_cxx_unqualified_id (pp, t);
       break;
 

gcc/cp/pt.c

@@ -12066,7 +12066,7 @@ tsubst_copy (tree t, tree args, tsubst_flags_t complain, tree in_decl)
     case PARM_DECL:
       r = retrieve_local_specialization (t);
 
-      if (r == NULL)
+      if (r == NULL_TREE)
 	{
 	  tree c;
 
@@ -12084,6 +12084,8 @@ tsubst_copy (tree t, tree args, tsubst_flags_t complain, tree in_decl)
 	     not the following PARM_DECLs that are chained to T.  */
 	  c = copy_node (t);
 	  r = tsubst_decl (c, args, complain);
+	  if (r == NULL_TREE)
+	    return error_mark_node;
 	  /* Give it the template pattern as its context; its true context
 	     hasn't been instantiated yet and this is good enough for
 	     mangling.  */

gcc/testsuite/ChangeLog

+2012-05-11  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/53305
+	* g++.dg/cpp0x/variadic132.C: New.
+
 2012-05-10  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/53158

gcc/testsuite/g++.dg/cpp0x/variadic132.C

+// PR c++/53305
+// { dg-do compile { target c++11 } }
+
+template<class... Ts> struct tuple { };
+
+struct funct
+{
+  template<class... argTs>
+  int operator()(argTs...);
+};
+
+template<class...> class test;
+
+template<template <class...> class tp,
+	 class... arg1Ts, class... arg2Ts>
+class test<tp<arg1Ts...>, tp<arg2Ts...>>
+{
+  template<class func, class...arg3Ts>
+    auto test2(func fun, arg1Ts... arg1s, arg3Ts... arg3s)
+    -> decltype(fun(arg1s..., arg3s...));
+};
+
+int main()
+{
+  test<tuple<>, tuple<char,int>> t2;
+  t2.test2(funct(), 'a', 2);  // { dg-error "no matching function" }
+}