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Source file src/cmd/vet/testdata/assign.go

Documentation: cmd/vet/testdata

  // 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 testdata
  
  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 }
  

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