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 - and then
52 // a type-checker will complain - but we don't allow ~ in the expr).
53 // TODO(rfindley): Improve error recover here. In these cases go/parser error
54 // recovery is worse than cmd/compile/internal/syntax, and unnecessary type
55 // declarations had to be inserted to force synchronization.
56 type _[t] t
57 type _[~ /* ERROR "expected operand" */ t] t
58 type /* ERROR "expected ']'" */ Sync int // placeholder to synchronize the parser
59 type _[t|t] t
60 type _[~ /* ERROR "expected operand" */ t|t] t
61 type /* ERROR "expected ']'" */ Sync int // placeholder to synchronize the parser
62 type _[t| ~ /* ERROR "expected operand" */ t] t
63 type /* ERROR "expected ']'" */ Sync int // placeholder to synchronize the parser
64 type _[~ /* ERROR "expected operand" */ t|~t] t
65 type /* ERROR "expected ']'" */ Sync int // placeholder to synchronize the parser
66
67 type _[_ t, t /* ERROR "type parameters must be named" */ ] t
68 type _[_ ~t, t /* ERROR "type parameters must be named" */ ] t
69 type _[_ t, ~ /* ERROR "type parameters must be named" */ t] t
70 type _[_ ~t, ~ /* ERROR "type parameters must be named" */ t] t
71
72 type _[_ t|t, t /* ERROR "type parameters must be named" */ |t] t
73 type _[_ ~t|t, t /* ERROR "type parameters must be named" */ |t] t
74 type _[_ t|t, ~ /* ERROR "type parameters must be named" */ t|t] t
75 type _[_ ~t|t, ~ /* ERROR "type parameters must be named" */ t|t] t
76
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