diff --git a/src/util/list_fn.cpp b/src/util/list_fn.cpp
new file mode 100644
index 000000000..e5ecc9b2a
--- /dev/null
+++ b/src/util/list_fn.cpp
@@ -0,0 +1,19 @@
+/*
+Copyright (c) 2015 Microsoft Corporation. All rights reserved.
+Released under Apache 2.0 license as described in the file LICENSE.
+
+Author: Leonardo de Moura
+*/
+#include "util/list.h"
+
+namespace lean {
+list<unsigned> mk_list_range(unsigned from, unsigned to) {
+    list<unsigned> r;
+    unsigned i = to;
+    while (i > from) {
+        i--;
+        r = cons(i, r);
+    }
+    return r;
+}
+}