1 // Copyright 2021 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 // This file contains test cases for typeset-only constraint elements.
6 // TODO(gri) gofmt once/if gofmt supports this notation.
7
8 package p
9
10 type (
11 _[_ t] t
12 _[_ ~t] t
13 _[_ t|t] t
14 _[_ ~t|t] t
15 _[_ t|~t] t
16 _[_ ~t|~t] t
17
18 _[_ t, _, _ t|t] t
19 _[_ t, _, _ ~t|t] t
20 _[_ t, _, _ t|~t] t
21 _[_ t, _, _ ~t|~t] t
22
23 _[_ t.t] t
24 _[_ ~t.t] t
25 _[_ t.t|t.t] t
26 _[_ ~t.t|t.t] t
27 _[_ t.t|~t.t] t
28 _[_ ~t.t|~t.t] t
29
30 _[_ t, _, _ t.t|t.t] t
31 _[_ t, _, _ ~t.t|t.t] t
32 _[_ t, _, _ t.t|~t.t] t
33 _[_ t, _, _ ~t.t|~t.t] t
34
35 _[_ struct{}] t
36 _[_ ~struct{}] t
37
38 _[_ struct{}|t] t
39 _[_ ~struct{}|t] t
40 _[_ struct{}|~t] t
41 _[_ ~struct{}|~t] t
42
43 _[_ t|struct{}] t
44 _[_ ~t|struct{}] t
45 _[_ t|~struct{}] t
46 _[_ ~t|~struct{}] t
47 )
48
49 // Single-expression type parameter lists and those that don't start
50 // with a (type parameter) name are considered array sizes.
51 // The term must be a valid expression (it could be a type incl. a
52 // tilde term) but the type-checker will complain.
53 type (
54 _[t] t
55 _[t|t] t
56
57 // These are invalid and the type-checker will complain.
58 _[~t] t
59 _[~t|t] t
60 _[t|~t] t
61 _[~t|~t] t
62 )
63
64 type _[_ t, t] /* ERROR "missing type constraint" */ t
65 type _[_ ~t, t] /* ERROR "missing type constraint" */ t
66 type _[_ t, ~ /* ERROR "missing type parameter name" */ t] t
67 type _[_ ~t, ~ /* ERROR "missing type parameter name" */ t] t
68
69 type _[_ t|t, t /* ERROR "missing type parameter name" */ |t] t
70 type _[_ ~t|t, t /* ERROR "missing type parameter name" */ |t] t
71 type _[_ t|t, ~ /* ERROR "missing type parameter name" */ t|t] t
72 type _[_ ~t|t, ~ /* ERROR "missing type parameter name" */ t|t] t
73
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