negative 0.1.2

Negative impls in stable Rust
Documentation 
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

# The following snippets fail to compile

#### Missing `!`

```rust ,compile_fail
use ::negative::*;

enum Foo {}

#[negative_impl]
impl Unpin for Foo {}
```

#### Missing `!Trait for`

```rust ,compile_fail
use ::negative::*;

enum Foo {}

#[negative_impl]
impl Foo {}
```

#### Non-empty impl body

```rust ,compile_fail
use ::negative::*;

enum Foo {}

#[negative_impl]
impl !Unpin for Foo {
    fn foo() {}
}
```

#### Properly removes trait impl

```rust ,compile_fail
struct Foo;

#[::negative::negative_impl]
impl !Unpin for Foo {}

const _: &dyn Unpin = &Foo;
```

#### Alas, `unsafe` is required for `unsafe trait`s

```rust ,compile_fail
struct Foo;

#[::negative::negative_impl]
impl !Send for Foo {}
```

<!-- Templated by `cargo-generate` using https://github.com/danielhenrymantilla/proc-macro-template -->