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

Documentation: cmd/vet/testdata

  // 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.
  
  // This file contains tests for the bool checker.
  
  package testdata
  
  import "io"
  
  func RatherStupidConditions() {
  	var f, g func() int
  	if f() == 0 || f() == 0 { // OK f might have side effects
  	}
  	if v, w := f(), g(); v == w || v == w { // ERROR "redundant or: v == w || v == w"
  	}
  	_ = f == nil || f == nil // ERROR "redundant or: f == nil || f == nil"
  
  	_ = i == byte(1) || i == byte(1) // TODO conversions are treated as if they may have side effects
  
  	var c chan int
  	_ = 0 == <-c || 0 == <-c                                  // OK subsequent receives may yield different values
  	for i, j := <-c, <-c; i == j || i == j; i, j = <-c, <-c { // ERROR "redundant or: i == j || i == j"
  	}
  
  	var i, j, k int
  	_ = i+1 == 1 || i+1 == 1         // ERROR "redundant or: i\+1 == 1 || i\+1 == 1"
  	_ = i == 1 || j+1 == i || i == 1 // ERROR "redundant or: i == 1 || i == 1"
  
  	_ = i == 1 || i == 1 || f() == 1 // ERROR "redundant or: i == 1 || i == 1"
  	_ = i == 1 || f() == 1 || i == 1 // OK f may alter i as a side effect
  	_ = f() == 1 || i == 1 || i == 1 // ERROR "redundant or: i == 1 || i == 1"
  
  	// Test partition edge cases
  	_ = f() == 1 || i == 1 || i == 1 || j == 1 // ERROR "redundant or: i == 1 || i == 1"
  	_ = f() == 1 || j == 1 || i == 1 || i == 1 // ERROR "redundant or: i == 1 || i == 1"
  	_ = i == 1 || f() == 1 || i == 1 || i == 1 // ERROR "redundant or: i == 1 || i == 1"
  	_ = i == 1 || i == 1 || f() == 1 || i == 1 // ERROR "redundant or: i == 1 || i == 1"
  	_ = i == 1 || i == 1 || j == 1 || f() == 1 // ERROR "redundant or: i == 1 || i == 1"
  	_ = j == 1 || i == 1 || i == 1 || f() == 1 // ERROR "redundant or: i == 1 || i == 1"
  	_ = i == 1 || f() == 1 || f() == 1 || i == 1
  
  	_ = i == 1 || (i == 1 || i == 2)             // ERROR "redundant or: i == 1 || i == 1"
  	_ = i == 1 || (f() == 1 || i == 1)           // OK f may alter i as a side effect
  	_ = i == 1 || (i == 1 || f() == 1)           // ERROR "redundant or: i == 1 || i == 1"
  	_ = i == 1 || (i == 2 || (i == 1 || i == 3)) // ERROR "redundant or: i == 1 || i == 1"
  
  	var a, b bool
  	_ = i == 1 || (a || (i == 1 || b)) // ERROR "redundant or: i == 1 || i == 1"
  
  	// Check that all redundant ors are flagged
  	_ = j == 0 ||
  		i == 1 ||
  		f() == 1 ||
  		j == 0 || // ERROR "redundant or: j == 0 || j == 0"
  		i == 1 || // ERROR "redundant or: i == 1 || i == 1"
  		i == 1 || // ERROR "redundant or: i == 1 || i == 1"
  		i == 1 ||
  		j == 0 ||
  		k == 0
  
  	_ = i == 1*2*3 || i == 1*2*3 // ERROR "redundant or: i == 1\*2\*3 || i == 1\*2\*3"
  
  	// These test that redundant, suspect expressions do not trigger multiple errors.
  	_ = i != 0 || i != 0 // ERROR "redundant or: i != 0 || i != 0"
  	_ = i == 0 && i == 0 // ERROR "redundant and: i == 0 && i == 0"
  
  	// and is dual to or; check the basics and
  	// let the or tests pull the rest of the weight.
  	_ = 0 != <-c && 0 != <-c         // OK subsequent receives may yield different values
  	_ = f() != 0 && f() != 0         // OK f might have side effects
  	_ = f != nil && f != nil         // ERROR "redundant and: f != nil && f != nil"
  	_ = i != 1 && i != 1 && f() != 1 // ERROR "redundant and: i != 1 && i != 1"
  	_ = i != 1 && f() != 1 && i != 1 // OK f may alter i as a side effect
  	_ = f() != 1 && i != 1 && i != 1 // ERROR "redundant and: i != 1 && i != 1"
  }
  
  func RoyallySuspectConditions() {
  	var i, j int
  
  	_ = i == 0 || i == 1 // OK
  	_ = i != 0 || i != 1 // ERROR "suspect or: i != 0 || i != 1"
  	_ = i != 0 || 1 != i // ERROR "suspect or: i != 0 || 1 != i"
  	_ = 0 != i || 1 != i // ERROR "suspect or: 0 != i || 1 != i"
  	_ = 0 != i || i != 1 // ERROR "suspect or: 0 != i || i != 1"
  
  	_ = (0 != i) || i != 1 // ERROR "suspect or: 0 != i || i != 1"
  
  	_ = i+3 != 7 || j+5 == 0 || i+3 != 9 // ERROR "suspect or: i\+3 != 7 || i\+3 != 9"
  
  	_ = i != 0 || j == 0 || i != 1 // ERROR "suspect or: i != 0 || i != 1"
  
  	_ = i != 0 || i != 1<<4 // ERROR "suspect or: i != 0 || i != 1<<4"
  
  	_ = i != 0 || j != 0
  	_ = 0 != i || 0 != j
  
  	var s string
  	_ = s != "one" || s != "the other" // ERROR "suspect or: s != .one. || s != .the other."
  
  	_ = "et" != "alii" || "et" != "cetera"         // ERROR "suspect or: .et. != .alii. || .et. != .cetera."
  	_ = "me gustas" != "tu" || "le gustas" != "tu" // OK we could catch this case, but it's not worth the code
  
  	var err error
  	_ = err != nil || err != io.EOF // TODO catch this case?
  
  	// Sanity check and.
  	_ = i != 0 && i != 1 // OK
  	_ = i == 0 && i == 1 // ERROR "suspect and: i == 0 && i == 1"
  	_ = i == 0 && 1 == i // ERROR "suspect and: i == 0 && 1 == i"
  	_ = 0 == i && 1 == i // ERROR "suspect and: 0 == i && 1 == i"
  	_ = 0 == i && i == 1 // ERROR "suspect and: 0 == i && i == 1"
  }
  

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