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used.go
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// errorcheck // Copyright 2020 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. package p import "unsafe" const C = 1 var x, x1, x2 int var b bool var s string var c chan int var cp complex128 var slice []int var array [2]int var bytes []byte var runes []rune var r rune func f0() {} func f1() int { return 1 } func f2() (int, int) { return 1, 1 } type T struct{ X int } func (T) M1() int { return 1 } func (T) M0() {} func (T) M() {} var t T var tp *T type I interface{ M() } var i I var m map[int]int func _() { // Note: if the next line changes to x, the error silences the x+x etc below! x1 // ERROR "x1 .* not used" nil // ERROR "nil .* not used" C // ERROR "C .* not used" 1 // ERROR "1 .* not used" x + x // ERROR "x \+ x .* not used" x - x // ERROR "x - x .* not used" x | x // ERROR "x \| x .* not used" "a" + s // ERROR ".a. \+ s .* not used" &x // ERROR "&x .* not used" b && b // ERROR "b && b .* not used" append(slice, 1) // ERROR "append\(slice, 1\) .* not used" string(bytes) // ERROR "string\(bytes\) .* not used" string(runes) // ERROR "string\(runes\) .* not used" f0() // ok f1() // ok f2() // ok _ = f0() // ERROR "f0\(\) .*used as value" _ = f1() // ok _, _ = f2() // ok _ = f2() // ERROR "assignment mismatch: 1 variable but f2 returns 2 values|cannot assign" _ = f1(), 0 // ERROR "assignment mismatch: 1 variable but 2 values|cannot assign" T.M0 // ERROR "T.M0 .* not used" t.M0 // ERROR "t.M0 .* not used" cap // ERROR "use of builtin cap not in function call|must be called" cap(slice) // ERROR "cap\(slice\) .* not used" close(c) // ok _ = close(c) // ERROR "close\(c\) .*used as value" func() {} // ERROR "func literal .* not used|is not used" X{} // ERROR "undefined: X" map[string]int{} // ERROR "map\[string\]int{} .* not used" struct{}{} // ERROR "struct ?{}{} .* not used" [1]int{} // ERROR "\[1\]int{} .* not used" []int{} // ERROR "\[\]int{} .* not used" &struct{}{} // ERROR "&struct ?{}{} .* not used" float32(x) // ERROR "float32\(x\) .* not used" I(t) // ERROR "I\(t\) .* not used" int(x) // ERROR "int\(x\) .* not used" copy(slice, slice) // ok _ = copy(slice, slice) // ok delete(m, 1) // ok _ = delete(m, 1) // ERROR "delete\(m, 1\) .*used as value" t.X // ERROR "t.X .* not used" tp.X // ERROR "tp.X .* not used" t.M // ERROR "t.M .* not used" I.M // ERROR "I.M .* not used" i.(T) // ERROR "i.\(T\) .* not used" x == x // ERROR "x == x .* not used" x != x // ERROR "x != x .* not used" x != x // ERROR "x != x .* not used" x < x // ERROR "x < x .* not used" x >= x // ERROR "x >= x .* not used" x > x // ERROR "x > x .* not used" *tp // ERROR "\*tp .* not used" slice[0] // ERROR "slice\[0\] .* not used" m[1] // ERROR "m\[1\] .* not used" len(slice) // ERROR "len\(slice\) .* not used" make(chan int) // ERROR "make\(chan int\) .* not used" make(map[int]int) // ERROR "make\(map\[int\]int\) .* not used" make([]int, 1) // ERROR "make\(\[\]int, 1\) .* not used" x * x // ERROR "x \* x .* not used" x / x // ERROR "x / x .* not used" x % x // ERROR "x % x .* not used" x << x // ERROR "x << x .* not used" x >> x // ERROR "x >> x .* not used" x & x // ERROR "x & x .* not used" x &^ x // ERROR "x &\^ x .* not used" new(int) // ERROR "new\(int\) .* not used" !b // ERROR "!b .* not used" ^x // ERROR "\^x .* not used" +x // ERROR "\+x .* not used" -x // ERROR "-x .* not used" b || b // ERROR "b \|\| b .* not used" panic(1) // ok _ = panic(1) // ERROR "panic\(1\) .*used as value" print(1) // ok _ = print(1) // ERROR "print\(1\) .*used as value" println(1) // ok _ = println(1) // ERROR "println\(1\) .*used as value" c <- 1 // ok slice[1:1] // ERROR "slice\[1:1\] .* not used" array[1:1] // ERROR "array\[1:1\] .* not used" s[1:1] // ERROR "s\[1:1\] .* not used" slice[1:1:1] // ERROR "slice\[1:1:1\] .* not used" array[1:1:1] // ERROR "array\[1:1:1\] .* not used" recover() // ok <-c // ok string(r) // ERROR "string\(r\) .* not used" iota // ERROR "undefined: iota|cannot use iota" real(cp) // ERROR "real\(cp\) .* not used" imag(cp) // ERROR "imag\(cp\) .* not used" complex(1, 2) // ERROR "complex\(1, 2\) .* not used" unsafe.Alignof(t.X) // ERROR "unsafe.Alignof\(t.X\) .* not used" unsafe.Offsetof(t.X) // ERROR "unsafe.Offsetof\(t.X\) .* not used" unsafe.Sizeof(t) // ERROR "unsafe.Sizeof\(t\) .* not used" _ = int // ERROR "type int is not an expression|not an expression" (x) // ERROR "x .* not used|not used" _ = new(x2) // ERROR "x2 is not a type|not a type" // Disabled due to issue #43125. // _ = new(1 + 1) // DISABLED "1 \+ 1 is not a type" }