re PR c++/51402 (ICE with invalid template parameter)

/cp
2012-01-20  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/51402
	* pt.c (lookup_template_class_1): Check context returned by
	tsubst for error_mark_node.

/testsuite
2012-01-20  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/51402
	* g++.dg/template/crash110.C: New.

From-SVN: r183345

gcc/cp/ChangeLog

+2012-01-20  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/51402
+	* pt.c (lookup_template_class_1): Check context returned by
+	tsubst for error_mark_node.
+
 2012-01-19  Kai Tietz  <ktietz@redhat.com>
 
 	PR c++/51344

gcc/cp/pt.c

 /* Handle parameterized types (templates) for GNU C++.
    Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
-   2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011
+   2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011, 2012
    Free Software Foundation, Inc.
    Written by Ken Raeburn (raeburn@cygnus.com) while at Watchmaker Computing.
    Rewritten by Jason Merrill (jason@cygnus.com).
@@ -7466,6 +7466,9 @@ lookup_template_class_1 (tree d1, tree arglist, tree in_decl, tree context,
 
       context = tsubst (DECL_CONTEXT (gen_tmpl), arglist,
 			complain, in_decl);
+      if (context == error_mark_node)
+	return error_mark_node;
+
       if (!context)
 	context = global_namespace;
 

gcc/testsuite/ChangeLog

+2012-01-20  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/51402
+	* g++.dg/template/crash110.C: New.
+
 2012-01-20  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
 
 	* gcc.misc-tests/gcov-14.c: Skip on alpha*-dec-osf*.

gcc/testsuite/g++.dg/template/crash110.C

+// PR c++/51402
+
+template<void> struct A   // { dg-error "not a valid type" }
+{
+  template<int,int> struct B {};
+  template<int N> struct B<N,N> {};
+};