Commits on Aug 4, 2021

1. Document lifetime elision for fn types, Fn*, impl …

   Currently, the lifetime elision doc only documents function definitions, but lifetime elision is also allowed in the following other locations:
   
   * `fn` types, such as `fn(&T)`
   * `Fn`/`FnMut`/`FnOnce`, such as `Fn(&T)`
   * `impl` headers
   
   To demo this up, I made some type aliases for `fn`/`Fn` which you can pass `&T` as a parameter to (to follow the lifetime rules of the surrounding context), and compared what you get with that instead of using `fn`/`Fn` directly, where lifetime elision takes on the rules from `fn`/`Fn`/etc.
   
   I also demoed up an `impl` header that used lifetime elision twice, although the error message in that case is broken (filed rust-lang/rust#87763)
   
   The demo was half for this change description, and half just to make sure I understand Rust -- in particular, I really had to reverse engineer it for `impl` because I wasn't sure, and it didn't seem to be documented anywhere (at least not here!)
   
   https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=f82b280de4b992f225bc32121f333e96

   

   ssbr committed Aug 4, 2021
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