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
105
106
107
108
109
110
111
112
113
114
115
116
117
118
|
use hir::InFile;
use crate::{Diagnostic, DiagnosticCode, DiagnosticsContext};
// Diagnostic: trait-impl-orphan
//
// Only traits defined in the current crate can be implemented for arbitrary types
pub(crate) fn trait_impl_orphan(
ctx: &DiagnosticsContext<'_>,
d: &hir::TraitImplOrphan,
) -> Diagnostic {
Diagnostic::new_with_syntax_node_ptr(
ctx,
DiagnosticCode::RustcHardError("E0117"),
"only traits defined in the current crate can be implemented for arbitrary types"
.to_owned(),
InFile::new(d.file_id, d.impl_.into()),
)
}
#[cfg(test)]
mod tests {
use crate::tests::check_diagnostics;
#[test]
fn simple() {
check_diagnostics(
r#"
//- /foo.rs crate:foo
pub trait Foo {}
//- /bar.rs crate:bar
pub struct Bar;
//- /main.rs crate:main deps:foo,bar
struct LocalType;
trait LocalTrait {}
impl foo::Foo for bar::Bar {}
//^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ error: only traits defined in the current crate can be implemented for arbitrary types
impl foo::Foo for LocalType {}
impl LocalTrait for bar::Bar {}
"#,
);
}
#[test]
fn generics() {
check_diagnostics(
r#"
//- /foo.rs crate:foo
pub trait Foo<T> {}
//- /bar.rs crate:bar
pub struct Bar<T>(T);
//- /main.rs crate:main deps:foo,bar
struct LocalType<T>;
trait LocalTrait<T> {}
impl<T> foo::Foo<T> for bar::Bar<T> {}
//^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ error: only traits defined in the current crate can be implemented for arbitrary types
impl<T> foo::Foo<T> for bar::Bar<LocalType<T>> {}
//^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ error: only traits defined in the current crate can be implemented for arbitrary types
impl<T> foo::Foo<LocalType<T>> for bar::Bar<T> {}
impl<T> foo::Foo<bar::Bar<LocalType<T>>> for bar::Bar<LocalType<T>> {}
//^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ error: only traits defined in the current crate can be implemented for arbitrary types
"#,
);
}
#[test]
fn fundamental() {
check_diagnostics(
r#"
//- /foo.rs crate:foo
pub trait Foo<T> {}
//- /bar.rs crate:bar
pub struct Bar<T>(T);
#[lang = "owned_box"]
#[fundamental]
pub struct Box<T>(T);
//- /main.rs crate:main deps:foo,bar
struct LocalType;
impl<T> foo::Foo<T> for bar::Box<T> {}
//^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ error: only traits defined in the current crate can be implemented for arbitrary types
impl<T> foo::Foo<T> for &LocalType {}
impl<T> foo::Foo<T> for bar::Box<LocalType> {}
"#,
);
}
#[test]
fn dyn_object() {
check_diagnostics(
r#"
//- /foo.rs crate:foo
pub trait Foo<T> {}
//- /bar.rs crate:bar
pub struct Bar;
//- /main.rs crate:main deps:foo,bar
trait LocalTrait {}
impl<T> foo::Foo<T> for dyn LocalTrait {}
impl<T> foo::Foo<dyn LocalTrait> for Bar {}
"#,
);
}
#[test]
fn twice_fundamental() {
check_diagnostics(
r#"
//- /foo.rs crate:foo
pub trait Trait {}
//- /bar.rs crate:bar deps:foo
struct Foo;
impl foo::Trait for &&Foo {}
"#,
);
}
}
|