Unsafe versions of standard library From<T> and Into<T>.

Install

toml [dependencies] unsafe_from = "1.0.0"

Use

```rust use unsafe_from::UnsafeFrom;

struct MyUnsafeType(i32);

unsafe impl UnsafeFrom for MyUnsafeType { unsafe fn unsafe_from(t: i32) -> MyUnsafeType { MyUnsafeType(t) } } ```