blob: 2846e5dc31d21e8e455327eb789f9c202eb20053 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
|
// errorcheck
// Copyright 2016 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.
// Test basic restrictions on type aliases.
package p
import (
"reflect"
. "reflect"
)
type T0 struct{}
// Valid type alias declarations.
type _ = T0
type _ = int
type _ = struct{}
type _ = reflect.Value
type _ = Value
type (
A0 = T0
A1 = int
A2 = struct{}
A3 = reflect.Value
A4 = Value
A5 = Value
N0 A0
)
// Methods can be declared on the original named type and the alias.
func (T0) m1() {} // GCCGO_ERROR "previous"
func (*T0) m1() {} // ERROR "method redeclared: T0\.m1|T0\.m1 already declared|redefinition of .m1."
func (A0) m1() {} // ERROR "T0\.m1 already declared|redefinition of .m1."
func (A0) m1() {} // ERROR "T0\.m1 already declared|redefinition of .m1."
func (A0) m2() {}
// Type aliases and the original type name can be used interchangeably.
var _ A0 = T0{}
var _ T0 = A0{}
// But aliases and original types cannot be used with new types based on them.
var _ N0 = T0{} // ERROR "cannot use T0{} \(value of type T0\) as N0 value in variable declaration"
var _ N0 = A0{} // ERROR "cannot use A0{} \(value of type T0\) as N0 value in variable declaration"
var _ A5 = Value{}
var _ interface {
m1()
m2()
} = T0{}
var _ interface {
m1()
m2()
} = A0{}
func _() {
type _ = T0
type _ = int
type _ = struct{}
type _ = reflect.Value
type _ = Value
type (
A0 = T0
A1 = int
A2 = struct{}
A3 = reflect.Value
A4 = Value
A5 Value
N0 A0
)
var _ A0 = T0{}
var _ T0 = A0{}
var _ N0 = T0{} // ERROR "cannot use T0{} \(value of type T0\) as N0 value in variable declaration"
var _ N0 = A0{} // ERROR "cannot use A0{} \(value of type T0\) as N0 value in variable declaration"
var _ A5 = Value{} // ERROR "cannot use Value{} \(value of type reflect\.Value\) as A5 value in variable declaration"
}
// Invalid type alias declarations.
type _ = reflect.ValueOf // ERROR "reflect.ValueOf .*is not a type|expected type"
func (A1) m() {} // ERROR "cannot define new methods on non-local type int|may not define methods on non-local type"
func (A2) m() {} // ERROR "invalid receiver type"
func (A3) m() {} // ERROR "cannot define new methods on non-local type reflect.Value|may not define methods on non-local type"
func (A4) m() {} // ERROR "cannot define new methods on non-local type reflect.Value|may not define methods on non-local type"
type B1 = struct{}
func (B1) m() {} // ERROR "invalid receiver type"
// TODO(gri) expand
|
