1 // Copyright 2013 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
4
5 package errors
6
7 // Testing precise operand formatting in error messages
8 // (matching messages are regular expressions, hence the \'s).
9 func f(x int, m map[string]int) {
10 // no values
11 _ = f /* ERROR "f\(0, m\) \(no value\) used as value" */ (0, m)
12
13 // built-ins
14 _ = println /* ERROR "println \(built-in\) must be called" */
15
16 // types
17 _ = complex128 /* ERROR "complex128 \(type\) is not an expression" */
18
19 // constants
20 const c1 = 991
21 const c2 float32 = 0.5
22 0 /* ERROR "0 \(untyped int constant\) is not used" */
23 c1 /* ERROR "c1 \(untyped int constant 991\) is not used" */
24 c2 /* ERROR "c2 \(constant 0.5 of type float32\) is not used" */
25 c1 /* ERROR "c1 \+ c2 \(constant 991.5 of type float32\) is not used" */ + c2
26
27 // variables
28 x /* ERROR "x \(variable of type int\) is not used" */
29
30 // values
31 x /* ERROR "x != x \(untyped bool value\) is not used" */ != x
32 x /* ERROR "x \+ x \(value of type int\) is not used" */ + x
33
34 // value, ok's
35 const s = "foo"
36 m /* ERROR "m\[s\] \(map index expression of type int\) is not used" */ [s]
37 }
38
39 // Valid ERROR comments can have a variety of forms.
40 func _() {
41 0 /* ERROR "0 .* is not used" */
42 0 /* ERROR 0 .* is not used */
43 0 // ERROR "0 .* is not used"
44 0 // ERROR 0 .* is not used
45 }
46
47 // Don't report spurious errors as a consequence of earlier errors.
48 // Add more tests as needed.
49 func _() {
50 if err := foo /* ERROR undeclared */ (); err != nil /* no error here */ {}
51 }
52
53 // Use unqualified names for package-local objects.
54 type T struct{}
55 var _ int = T /* ERROR value of type T */ {} // use T in error message rather then errors.T
56
57 // Don't report errors containing "invalid type" (issue #24182).
58 func _(x *missing /* ERROR undeclared name: missing */ ) {
59 x.m() // there shouldn't be an error here referring to *invalid type
60 }
61
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