re PR c++/25854 (Bogus diagnostic with '<type error>')

	PR c++/25854
	* pt.c (maybe_process_partial_specialization): Return early on
	error_mark_node.

	* g++.dg/template/spec28.C: New test.

From-SVN: r109975

gcc/cp/ChangeLog

 2006-01-19  Volker Reichelt  <reichelt@igpm.rwth-aachen.de>
 
+	PR c++/25854
+	* pt.c (maybe_process_partial_specialization): Return early on
+	error_mark_node.
+
+2006-01-19  Volker Reichelt  <reichelt@igpm.rwth-aachen.de>
+
 	PR c++/16829
 	* decl.c (start_preparsed_function): Check default arguments
 	unconditionally.

gcc/cp/pt.c

@@ -678,8 +678,12 @@ check_explicit_instantiation_namespace (tree spec)
 void
 maybe_process_partial_specialization (tree type)
 {
-  /* TYPE maybe an ERROR_MARK_NODE.  */
-  tree context = TYPE_P (type) ? TYPE_CONTEXT (type) : NULL_TREE;
+  tree context;
+
+  if (type == error_mark_node)
+    return;
+
+  context = TYPE_CONTEXT (type);
 
   if (CLASS_TYPE_P (type) && CLASSTYPE_USE_TEMPLATE (type))
     {

gcc/testsuite/ChangeLog

+2006-01-19  Volker Reichelt  <reichelt@igpm.rwth-aachen.de>
+
+	PR c++/25854
+	* g++.dg/template/spec28.C: New test.
+
 2006-01-19  Andrew Pinski  <pinskia@physics.uc.edu>
 
 	* objc.dg/gnu-encoding/struct-layout-encoding-1_generate.c (switchfiles):

gcc/testsuite/g++.dg/template/spec28.C

+// PR c++/25854
+// Bad diagnostic
+// { dg-do compile }
+
+template<typename> struct A {};  // { dg-error "provided" }
+template<> struct A<> {};        // { dg-error "wrong number" }