--- /dev/null
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Unsigned integers spanning zero.
+
+package main
+
+import "fmt"
+
+type Unum uint8
+
+const (
+ m_2 Unum = iota + 253
+ m_1
+)
+
+const (
+ m0 Unum = iota
+ m1
+ m2
+)
+
+func main() {
+ ck(^Unum(0)-3, "Unum(252)")
+ ck(m_2, "m_2")
+ ck(m_1, "m_1")
+ ck(m0, "m0")
+ ck(m1, "m1")
+ ck(m2, "m2")
+ ck(3, "Unum(3)")
+}
+
+func ck(unum Unum, str string) {
+ if fmt.Sprint(unum) != str {
+ panic("unum.go: " + str)
+ }
+}