3 // Copyright 2020 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.
25 func f1() int { return 1 }
26 func f2() (int, int) { return 1, 1 }
28 type T struct{ X int }
30 func (T) M1() int { return 1 }
37 type I interface{ M() }
44 // Note: if the next line changes to x, the error silences the x+x etc below!
45 x1 // ERROR "x1 .* not used"
47 nil // ERROR "nil .* not used"
48 C // ERROR "C .* not used"
49 1 // ERROR "1 .* not used"
50 x + x // ERROR "x \+ x .* not used"
51 x - x // ERROR "x - x .* not used"
52 x | x // ERROR "x \| x .* not used"
53 "a" + s // ERROR ".a. \+ s .* not used"
54 &x // ERROR "&x .* not used"
55 b && b // ERROR "b && b .* not used"
56 append(slice, 1) // ERROR "append\(slice, 1\) .* not used"
57 string(bytes) // ERROR "string\(bytes\) .* not used"
58 string(runes) // ERROR "string\(runes\) .* not used"
62 _ = f0() // ERROR "f0\(\) .*used as value"
65 _ = f2() // ERROR "assignment mismatch: 1 variable but f2 returns 2 values|cannot assign"
66 _ = f1(), 0 // ERROR "assignment mismatch: 1 variable but 2 values|cannot assign"
67 T.M0 // ERROR "T.M0 .* not used"
68 t.M0 // ERROR "t.M0 .* not used"
69 cap // ERROR "use of builtin cap not in function call|must be called"
70 cap(slice) // ERROR "cap\(slice\) .* not used"
72 _ = close(c) // ERROR "close\(c\) .*used as value"
73 func() {} // ERROR "func literal .* not used|is not used"
74 X{} // ERROR "undefined: X"
75 map[string]int{} // ERROR "map\[string\]int{} .* not used"
76 struct{}{} // ERROR "struct ?{}{} .* not used"
77 [1]int{} // ERROR "\[1\]int{} .* not used"
78 []int{} // ERROR "\[\]int{} .* not used"
79 &struct{}{} // ERROR "&struct ?{}{} .* not used"
80 float32(x) // ERROR "float32\(x\) .* not used"
81 I(t) // ERROR "I\(t\) .* not used"
82 int(x) // ERROR "int\(x\) .* not used"
83 copy(slice, slice) // ok
84 _ = copy(slice, slice) // ok
86 _ = delete(m, 1) // ERROR "delete\(m, 1\) .*used as value"
87 t.X // ERROR "t.X .* not used"
88 tp.X // ERROR "tp.X .* not used"
89 t.M // ERROR "t.M .* not used"
90 I.M // ERROR "I.M .* not used"
91 i.(T) // ERROR "i.\(T\) .* not used"
92 x == x // ERROR "x == x .* not used"
93 x != x // ERROR "x != x .* not used"
94 x != x // ERROR "x != x .* not used"
95 x < x // ERROR "x < x .* not used"
96 x >= x // ERROR "x >= x .* not used"
97 x > x // ERROR "x > x .* not used"
98 *tp // ERROR "\*tp .* not used"
99 slice[0] // ERROR "slice\[0\] .* not used"
100 m[1] // ERROR "m\[1\] .* not used"
101 len(slice) // ERROR "len\(slice\) .* not used"
102 make(chan int) // ERROR "make\(chan int\) .* not used"
103 make(map[int]int) // ERROR "make\(map\[int\]int\) .* not used"
104 make([]int, 1) // ERROR "make\(\[\]int, 1\) .* not used"
105 x * x // ERROR "x \* x .* not used"
106 x / x // ERROR "x / x .* not used"
107 x % x // ERROR "x % x .* not used"
108 x << x // ERROR "x << x .* not used"
109 x >> x // ERROR "x >> x .* not used"
110 x & x // ERROR "x & x .* not used"
111 x &^ x // ERROR "x &\^ x .* not used"
112 new(int) // ERROR "new\(int\) .* not used"
113 !b // ERROR "!b .* not used"
114 ^x // ERROR "\^x .* not used"
115 +x // ERROR "\+x .* not used"
116 -x // ERROR "-x .* not used"
117 b || b // ERROR "b \|\| b .* not used"
119 _ = panic(1) // ERROR "panic\(1\) .*used as value"
121 _ = print(1) // ERROR "print\(1\) .*used as value"
123 _ = println(1) // ERROR "println\(1\) .*used as value"
125 slice[1:1] // ERROR "slice\[1:1\] .* not used"
126 array[1:1] // ERROR "array\[1:1\] .* not used"
127 s[1:1] // ERROR "s\[1:1\] .* not used"
128 slice[1:1:1] // ERROR "slice\[1:1:1\] .* not used"
129 array[1:1:1] // ERROR "array\[1:1:1\] .* not used"
132 string(r) // ERROR "string\(r\) .* not used"
133 iota // ERROR "undefined: iota|cannot use iota"
134 real(cp) // ERROR "real\(cp\) .* not used"
135 imag(cp) // ERROR "imag\(cp\) .* not used"
136 complex(1, 2) // ERROR "complex\(1, 2\) .* not used"
137 unsafe.Alignof(t.X) // ERROR "unsafe.Alignof\(t.X\) .* not used"
138 unsafe.Offsetof(t.X) // ERROR "unsafe.Offsetof\(t.X\) .* not used"
139 unsafe.Sizeof(t) // ERROR "unsafe.Sizeof\(t\) .* not used"
140 _ = int // ERROR "type int is not an expression|not an expression"
141 (x) // ERROR "x .* not used|not used"
142 _ = new(x2) // ERROR "x2 is not a type|not a type"
143 // Disabled due to issue #43125.
144 // _ = new(1 + 1) // DISABLED "1 \+ 1 is not a type"