…askrgr

Rollup of 10 pull requests

Successful merges:

 - rust-lang#88642 (Formally implement let chains)
 - rust-lang#89621 (doc: guarantee call order for sort_by_cached_key)
 - rust-lang#91278 (Use iterator instead of recursion in `codegen_place`)
 - rust-lang#92124 (Little improves in CString `new` when creating from slice)
 - rust-lang#92783 (Annotate dead code lint with notes about ignored derived impls)
 - rust-lang#92797 (Remove horizontal lines at top of page)
 - rust-lang#92920 (Move expr- and item-related pretty printing functions to modules)
 - rust-lang#93041 (Remove some unused ordering derivations based on `DefId`)
 - rust-lang#93051 (Add Option::is_some_with and Result::is_{ok,err}_with)
 - rust-lang#93062 (Update books)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

Drop unstable `Option::contains`, `Result::contains`, `Result::contains_err`

This is a proposal to drop the three functions `Option::contains`, `Result::contains` and `Result::contains_err`.

The discovery of `Option::is_some_with`/`Result::is_ok_with`/`Result::is_err_with` in rust-lang#93051 obviates the need for these methods (non-stabilization tracked in rust-lang#62358).

An additional benefit of change is that it avoids spurious error messages in IDEs, when `contains` is supplied by a third-party library:
![option-result-unstable](https://user-images.githubusercontent.com/42493/219127961-13cb559e-6ee8-4449-8dc9-d28d07270ad5.png)

Drop unstable `Option::contains`, `Result::contains`, `Result::contains_err`

This is a proposal to drop the three functions `Option::contains`, `Result::contains` and `Result::contains_err`.

The discovery of `Option::is_some_with`/`Result::is_ok_with`/`Result::is_err_with` in rust-lang/rust#93051 obviates the need for these methods (non-stabilization tracked in rust-lang/rust#62358).

An additional benefit of change is that it avoids spurious error messages in IDEs, when `contains` is supplied by a third-party library:
![option-result-unstable](https://user-images.githubusercontent.com/42493/219127961-13cb559e-6ee8-4449-8dc9-d28d07270ad5.png)

Drop unstable `Option::contains`, `Result::contains`, `Result::contains_err`

This is a proposal to drop the three functions `Option::contains`, `Result::contains` and `Result::contains_err`.

The discovery of `Option::is_some_with`/`Result::is_ok_with`/`Result::is_err_with` in rust-lang/rust#93051 obviates the need for these methods (non-stabilization tracked in rust-lang/rust#62358).

An additional benefit of change is that it avoids spurious error messages in IDEs, when `contains` is supplied by a third-party library:
![option-result-unstable](https://user-images.githubusercontent.com/42493/219127961-13cb559e-6ee8-4449-8dc9-d28d07270ad5.png)

Drop unstable `Option::contains`, `Result::contains`, `Result::contains_err`

This is a proposal to drop the three functions `Option::contains`, `Result::contains` and `Result::contains_err`.

The discovery of `Option::is_some_with`/`Result::is_ok_with`/`Result::is_err_with` in rust-lang/rust#93051 obviates the need for these methods (non-stabilization tracked in rust-lang/rust#62358).

An additional benefit of change is that it avoids spurious error messages in IDEs, when `contains` is supplied by a third-party library:
![option-result-unstable](https://user-images.githubusercontent.com/42493/219127961-13cb559e-6ee8-4449-8dc9-d28d07270ad5.png)

Drop unstable `Option::contains`, `Result::contains`, `Result::contains_err`

This is a proposal to drop the three functions `Option::contains`, `Result::contains` and `Result::contains_err`.

The discovery of `Option::is_some_with`/`Result::is_ok_with`/`Result::is_err_with` in rust-lang/rust#93051 obviates the need for these methods (non-stabilization tracked in rust-lang/rust#62358).

An additional benefit of change is that it avoids spurious error messages in IDEs, when `contains` is supplied by a third-party library:
![option-result-unstable](https://user-images.githubusercontent.com/42493/219127961-13cb559e-6ee8-4449-8dc9-d28d07270ad5.png)