golang assign 代码
文件路径：/src/cmd/vet/testdata/assign/assign.go
/ Copyright 2013 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.
/ This file contains tests for the useless-assignment checker.
package assign
import "math/rand"
type ST struct {
x int
l []int
}
func (s *ST) SetX(x int, ch chan int) {
/ Accidental self-assignment; it should be "s.x = x"
x = x / ERROR "self-assignment of x to x"
/ Another mistake
s.x = s.x / ERROR "self-assignment of s.x to s.x"
s.l[0] = s.l[0] / ERROR "self-assignment of s.l.0. to s.l.0."
/ Bail on any potential side effects to avoid false positives
s.l[num()] = s.l[num()]
rng := rand.New(rand.NewSource(0))
s.l[rng.Intn(len(s.l))] = s.l[rng.Intn(len(s.l))]
s.l[<-ch] = s.l[<-ch]
}
func num() int { return 2 }