diff --git a/ivl_target_priv.h b/ivl_target_priv.h
index f6949cf07..a5a10d01d 100644
--- a/ivl_target_priv.h
+++ b/ivl_target_priv.h
@@ -59,7 +59,7 @@ struct ivl_design_s {
       std::vector<ivl_scope_t> root_scope_list;
 
 	// Keep an array of constants objects.
-      std::valarray<ivl_net_const_t> consts;
+      std::vector<ivl_net_const_t> consts;
 
 	// Keep a handy array of all of the disciplines in the design.
       std::valarray<ivl_discipline_t> disciplines;
diff --git a/t-dll.cc b/t-dll.cc
index f7151084d..8b96a4636 100644
--- a/t-dll.cc
+++ b/t-dll.cc
@@ -2301,8 +2301,7 @@ bool dll_target::net_const(const NetConst*net)
       obj->pin_ = nex->t_cookie();
       nexus_con_add(obj->pin_, obj, 0, drv0, drv1);
 
-      des_.consts.resize( des_.consts.size() + 1 );
-      des_.consts[des_.consts.size()-1] = obj;
+      des_.consts.push_back(obj);
 
       make_const_delays_(obj, net);
 
@@ -2333,8 +2332,7 @@ bool dll_target::net_literal(const NetLiteral*net)
       obj->pin_ = nex->t_cookie();
       nexus_con_add(obj->pin_, obj, 0, drv0, drv1);
 
-      des_.consts.resize( des_.consts.size() + 1 );
-      des_.consts[des_.consts.size()-1] = obj;
+      des_.consts.push_back(obj);
 
       make_const_delays_(obj, net);
 
diff --git a/tgt-stub/Makefile.in b/tgt-stub/Makefile.in
index bbbb91f1c..b294d3000 100644
--- a/tgt-stub/Makefile.in
+++ b/tgt-stub/Makefile.in
@@ -44,7 +44,7 @@ CPPFLAGS = $(INCLUDE_PATH) @CPPFLAGS@ @DEFS@ @PICFLAG@
 CFLAGS = @WARNING_FLAGS@ @CFLAGS@
 LDFLAGS = @LDFLAGS@
 
-O = stub.o classes.o enumerate.o expression.o statement.o switches.o types.o
+O = stub.o classes.o constant.o enumerate.o expression.o statement.o switches.o types.o
 
 all: dep stub.tgt
 
diff --git a/tgt-stub/constant.c b/tgt-stub/constant.c
new file mode 100644
index 000000000..4074e071a
--- /dev/null
+++ b/tgt-stub/constant.c
@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2013 Stephen Williams (steve@icarus.com)
+ *
+ *    This source code is free software; you can redistribute it
+ *    and/or modify it in source code form under the terms of the GNU
+ *    General Public License as published by the Free Software
+ *    Foundation; either version 2 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, write to the Free Software
+ *    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+# include "config.h"
+# include "priv.h"
+# include <stdlib.h>
+# include <inttypes.h>
+# include <assert.h>
+
+void show_constant(ivl_net_const_t net)
+{
+      unsigned idx;
+      const char*bits = ivl_const_bits(net);
+      assert(net);
+
+      fprintf(out, "constant ");
+      for (idx = 0 ; idx < ivl_const_width(net) ; idx += 1)
+	    fprintf(out, "%c", bits[idx]);
+
+      fprintf(out, " at %s:%u\n", ivl_const_file(net), ivl_const_lineno(net));
+}
diff --git a/tgt-stub/priv.h b/tgt-stub/priv.h
index 60902779d..9a2a48663 100644
--- a/tgt-stub/priv.h
+++ b/tgt-stub/priv.h
@@ -51,6 +51,7 @@ extern void test_expr_is_delay(ivl_expr_t expr);
 
 extern void show_class(ivl_type_t net);
 extern void show_enumerate(ivl_enumtype_t net);
+extern void show_constant(ivl_net_const_t net);
 
 /*
  * Show the details of the expression.
diff --git a/tgt-stub/stub.c b/tgt-stub/stub.c
index c68c885ff..d16b73b2b 100644
--- a/tgt-stub/stub.c
+++ b/tgt-stub/stub.c
@@ -1738,6 +1738,12 @@ int target_design(ivl_design_t des)
 	    free(cur);
       }
 
+      fprintf(out, "# There are %u constants detected\n", ivl_design_consts(des));
+      for (idx = 0 ; idx < ivl_design_consts(des) ; idx += 1) {
+	    ivl_net_const_t con = ivl_design_const(des, idx);
+	    show_constant(con);
+      }
+
       ivl_design_process(des, show_process, 0);
       fclose(out);