1 // errorcheck 2 3 // Copyright 2013 The Go Authors. All rights reserved. 4 // Use of this source code is governed by a BSD-style 5 // license that can be found in the LICENSE file. 6 7 // Issue 4654. 8 // Check error for conversion and 'not used' in defer/go. 9 10 package p 11 12 import "unsafe" 13 14 func f() { 15 defer int(0) // ERROR "defer requires function call, not conversion|is not used" 16 go string([]byte("abc")) // ERROR "go requires function call, not conversion|is not used" 17 18 var c complex128 19 var f float64 20 var t struct {X int} 21 22 var x []int 23 defer append(x, 1) // ERROR "defer discards result of append|is not used" 24 defer cap(x) // ERROR "defer discards result of cap|is not used" 25 defer complex(1, 2) // ERROR "defer discards result of complex|is not used" 26 defer complex(f, 1) // ERROR "defer discards result of complex|is not used" 27 defer imag(1i) // ERROR "defer discards result of imag|is not used" 28 defer imag(c) // ERROR "defer discards result of imag|is not used" 29 defer len(x) // ERROR "defer discards result of len|is not used" 30 defer make([]int, 1) // ERROR "defer discards result of make|is not used" 31 defer make(chan bool) // ERROR "defer discards result of make|is not used" 32 defer make(map[string]int) // ERROR "defer discards result of make|is not used" 33 defer new(int) // ERROR "defer discards result of new|is not used" 34 defer real(1i) // ERROR "defer discards result of real|is not used" 35 defer real(c) // ERROR "defer discards result of real|is not used" 36 defer append(x, 1) // ERROR "defer discards result of append|is not used" 37 defer append(x, 1) // ERROR "defer discards result of append|is not used" 38 defer unsafe.Alignof(t.X) // ERROR "defer discards result of unsafe.Alignof|is not used" 39 defer unsafe.Offsetof(t.X) // ERROR "defer discards result of unsafe.Offsetof|is not used" 40 defer unsafe.Sizeof(t) // ERROR "defer discards result of unsafe.Sizeof|is not used" 41 42 defer copy(x, x) // ok 43 m := make(map[int]int) 44 defer delete(m, 1) // ok 45 defer panic(1) // ok 46 defer print(1) // ok 47 defer println(1) // ok 48 defer recover() // ok 49 50 int(0) // ERROR "int\(0\) evaluated but not used|is not used" 51 string([]byte("abc")) // ERROR "string\(.*\) evaluated but not used|is not used" 52 53 append(x, 1) // ERROR "not used" 54 cap(x) // ERROR "not used" 55 complex(1, 2) // ERROR "not used" 56 complex(f, 1) // ERROR "not used" 57 imag(1i) // ERROR "not used" 58 imag(c) // ERROR "not used" 59 len(x) // ERROR "not used" 60 make([]int, 1) // ERROR "not used" 61 make(chan bool) // ERROR "not used" 62 make(map[string]int) // ERROR "not used" 63 new(int) // ERROR "not used" 64 real(1i) // ERROR "not used" 65 real(c) // ERROR "not used" 66 append(x, 1) // ERROR "not used" 67 append(x, 1) // ERROR "not used" 68 unsafe.Alignof(t.X) // ERROR "not used" 69 unsafe.Offsetof(t.X) // ERROR "not used" 70 unsafe.Sizeof(t) // ERROR "not used" 71 } 72
