* valops.c (value_cast_structs): Return NULL for failure.

(value_cast): Handle NULL from value_cast_structs.
	(value_fetch_lazy): Call check_typedef.  Remove unused variable.

	testsuite/
	* gdb.base/structs3.c, gdb.base/structs3.exp: New files.

gdb/testsuite/gdb.base/structs3.c

@@ -0,0 +1,42 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2008
+   Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+struct One
+{
+  int x;
+};
+
+struct Two
+{
+  struct One one;
+  int x, y;
+};
+
+struct Two two = { { 1 }, 2, 3 };
+
+typedef struct One tOne;
+typedef struct Two tTwo;
+
+tOne *onep = &two.one;
+tTwo *twop = &two;
+
+int main()
+{
+  onep->x = twop->y;
+  return 0;
+}