//! Trust Me; I Promise!
//!
//! - **Date:** November 30, 2018
//! - **Subject:** An intro to `unsafe` Rust and Rust's idea of safety.
//! - [**download mp3**][mp3]
//! - [**script**][script]
//!
//! [mp3]: https://www.podtrac.com/pts/redirect.mp3/cdn.newrustacean.com/file/newrustacean/e027.mp3
//! [script]: https://newrustacean.com/show_notes/e027/struct.script
//!
//! <audio style="width: 100%" title="News: Rust 1.29 and 1.30" controls preload=metadata src="https://www.podtrac.com/pts/redirect.mp3/cdn.newrustacean.com/file/newrustacean/e027.mp3">
//!
//! Show Notes
//! ----------
//!
//! ### Errata
//!
//! A quick correction: on the show I said that a trait needed to be unsafe when
//! it had an `unsafe fn` method. This isn't correct: safe traits can have
//! unsafe methods, and unsafe traits can exist without any methods at all (as
//! implied by my reference to `Send` and `Sync`). You can see this in practice
//! in the following example, which compiles just fine!
//!
//! ```
//! trait ASafeTrait {
//!     unsafe fn unsafe_method() {}
//! }
//!
//! unsafe trait AnUnsafeTrait {}
//! ```
//!
//! The idea of an `unsafe` trait is that it has some conditions which you must
//! uphold to safely implement it – again, just as with `Send` and `Sync`. In
//! the case of most traits, this will be because some trait method has
//! invariants it needs to hold else it would cause undefined behavior. For
//! another example of this, see the (unstable as of the time of recording)
//! trait [`std::iter::TrustedLen`].
//!
//! [`std::iter::TrustedLen`]: https://doc.rust-lang.org/nightly/std/iter/trait.TrustedLen.html
//!
//! Thanks to Rust language team member [@centril] for noting this to me after
//! listening when I was recording the show live!
//!
//! [@centril]: https://github.com/centril
//!
//! ### Links
//!
//! - [_The Rust Programming Language_, Chapter 19: Unsafe][book]
//! - [The Nomicon][nomicon]
//! - ["Rust and OpenGL from Scratch", by Nerijus Arlauskas][opengl]
//!
//! [book]: https://doc.rust-lang.org/book/2018-edition/ch19-01-unsafe-rust.html
//! [nomicon]: https://doc.rust-lang.org/nomicon/README.html
//! [opengl]: http://nercury.github.io/rust/opengl/tutorial/2018/02/08/opengl-in-rust-from-scratch-00-setup.html
//!
//!
//! ### Examples
//!
//! #### Borrow-checked code in `unsafe`
//!
//! ```
//! let mut f = String::from("foo");
//!
//! unsafe {
//!     let borrowed = &mut f;
//!
//!     // This would be unsafe and throw an error (before Rust 2018):
//!     // let borrow_again = &f;
//!
//!     println!("{}", borrowed);
//!
//!     // This would be unsafe and throw an error:
//!     // println!("{}", borrow_again);
//! }
//! ```
//!
//! [(See it in a playground)][safe `unsafe`]
//!
//! [safe `unsafe`]: https://play.rust-lang.org/?version=beta&mode=release&edition=2018&gist=38d1089cdc3a4148609e9e3bbbfd002c
//!
//! ##### Safely mutating a raw pointer
//!
//! ```
//! let f = Box::new(12);
//! let mut g = Box::into_raw(f);
//! g = &mut 10;
//! ```
//!
//! [(See it in a playground)][safe mutate]
//!
//! [safe mutate]: https://play.rust-lang.org/?version=stable&mode=debug&edition=2015&gist=3a7a9facd0f67d4a590afc3a3ecef95b
//!
//! Sponsors
//! --------
//!
//! Thanks to Parity for sponsoring the show again. Go check out their [***Rust
//! jobs***][parity]!
//!
//! [parity]: https://paritytech.io/jobs/
//!
//! ### Patreon Sponsors
//!
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//!
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//!
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//!
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//! -------
//!
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#[doc = include_str!("../docs/e027-script.md")]
pub struct Script;