Index: generic/gdbtk-varobj.c
===================================================================
RCS file: /cvs/src/src/gdb/gdbtk/generic/gdbtk-varobj.c,v
retrieving revision 1.25
diff -u -p -r1.25 gdbtk-varobj.c
--- generic/gdbtk-varobj.c	17 Sep 2009 07:00:48 -0000	1.25
+++ generic/gdbtk-varobj.c	29 Apr 2010 20:57:25 -0000
@@ -1,5 +1,6 @@
 /* Variable user interface layer for GDB, the GNU debugger.
-   Copyright (C) 1999, 2000, 2001, 2002, 2008 Free Software Foundation, Inc.
+   Copyright (C) 1999, 2000, 2001, 2002, 2008, 2010
+   Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -22,6 +23,7 @@
 #include "value.h"
 #include "gdb_string.h"
 #include "varobj.h"
+#include "exceptions.h"
 
 #include <tcl.h>
 #include "gdbtk.h"
@@ -574,9 +576,16 @@ variable_value (Tcl_Interp *interp, int 
       if (varobj_get_attributes (var) & 0x00000001 /* Editable? */ )
 	{
 	  char *s;
+	  int ok = 0;
+	  struct gdb_exception e;
 
 	  s = Tcl_GetStringFromObj (objv[2], NULL);
-	  if (!varobj_set_value (var, s))
+	  TRY_CATCH (e, RETURN_MASK_ERROR)
+	    {
+	      ok = varobj_set_value (var, s);
+	    }
+
+	  if (e.reason < 0 || !ok)
             {
 	      gdbtk_set_result (interp, "Could not assign expression to variable object");
 	      return TCL_ERROR;
Index: library/vartree.itb
===================================================================
RCS file: /cvs/src/src/gdb/gdbtk/library/vartree.itb,v
retrieving revision 1.8
diff -u -p -r1.8 vartree.itb
--- library/vartree.itb	24 Apr 2009 03:38:49 -0000	1.8
+++ library/vartree.itb	29 Apr 2010 20:57:25 -0000
@@ -1,5 +1,5 @@
 # Variable tree implementation for Insight.
-# Copyright (C) 2002, 2009 Red Hat, Inc.
+# Copyright (C) 2002, 2009, 2010 Red Hat, Inc.
 #
 # This program is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License (GPL) as published by
@@ -286,6 +286,14 @@ itcl::body  VarTree::changeValue {j} {
     unedit $j
     return
   }
+
+  # NOTE: Varobj requires decimal input radix. So either
+  # we must assume that all input is decimal (unless prefixed by
+  # "0x"), or we assume that the input radix is the same as the
+  # variable's display radix.
+  #
+  # I think that consistency wins out over convenience here. We will
+  # require users to prefix non-decimal expressions.
   if {[catch {$entryobj value $new} errTxt]} {
     # gdbtk-varobj doesn't actually return meaningful error messages
     # so use a generic one.