golang issue12686 代码
文件路径：/test/fixedbugs/issue12686.go
/ compile
/ Copyright 2015 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.
/ golang.org/issue/12686.
/ interesting because it's a non-constant but ideal value
/ and we used to incorrectly attach a constant Val to the Node.
package p
func f(i uint) uint {
x := []uint{1 << i}
return x[0]
}