re PR c++/21383 (Crash when finding &a_templated_func<>)

cp:
	PR c++/21383
	* name-lookup.c (arg_assoc): Template args can be null in a
	template-id-expr.
testsuite:
	PR c++/21383
	* g++.dg/overload/koenig2.C: New.

From-SVN: r105553

gcc/cp/ChangeLog

 2005-10-18  Nathan Sidwell  <nathan@codesourcery.com>
 
+	PR c++/21383
+	* name-lookup.c (arg_assoc): Template args can be null in a
+	template-id-expr.
+
 	PR c++/22604
 	* class.c (update_vtable_entry_for_fn): Don't process invalid
 	covariant overriders.

gcc/cp/name-lookup.c

@@ -4594,9 +4594,10 @@ arg_assoc (struct arg_lookup *k, tree n)
 	return true;
 
       /* Now the arguments.  */
-      for (ix = TREE_VEC_LENGTH (args); ix--;)
-	if (arg_assoc_template_arg (k, TREE_VEC_ELT (args, ix)) == 1)
-	  return true;
+      if (args)
+	for (ix = TREE_VEC_LENGTH (args); ix--;)
+	  if (arg_assoc_template_arg (k, TREE_VEC_ELT (args, ix)) == 1)
+	    return true;
     }
   else if (TREE_CODE (n) == OVERLOAD)
     {

gcc/testsuite/ChangeLog

 2005-10-18  Nathan Sidwell  <nathan@codesourcery.com>
 
+	PR c++/21383
+	* g++.dg/overload/koenig2.C: New.
+
 	PR c++/23118
 	* g++.dg/overload/error2.C: New.
 

gcc/testsuite/g++.dg/overload/koenig2.C

+// Copyright (C) 2005 Free Software Foundation, Inc.
+// Contributed by Nathan Sidwell 18 Oct 2005 <nathan@codesourcery.com>
+
+// PR 21383
+// Origin: Matthew Hall <mahall@ncsa.uiuc.edu>
+
+template <class T>
+void dummy(T& t);
+
+void anyfunc(int x);
+
+void Foo ()
+{
+  anyfunc (&dummy<>); // { dg-error "cannot resolve overload" "" }
+}