sealed 0.1.0

Macro for sealing traits and structures
Documentation 
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# `#[sealed]`

This crate provide a convinient and simple way to implement the sealed trait pattern,
as described in the Rust API Guidelines [[1](https://rust-lang.github.io/api-guidelines/future-proofing.html#sealed-traits-protect-against-downstream-implementations-c-sealed)].

```toml
[dependencies]
sealed = "0.1"
```

## Example

```rust
use sealed::sealed;

#[sealed]
trait T {}

#[sealed]
pub struct A;

impl T for A {}

#[sealed]
pub struct B{
    field_1: i32
}

impl T for B {}

fn main() {
    return
}
```