This attempts to be a little clearer (including in terminology) about the lack
of guarantees that any::type_name provides.

… output.

Because there is at most one file.

… r=kennytm

Be slightly more precise about any::type_name()'s guarantees.

The first commit in this PR rephrases the current documentation for `any::type_name()` to be a little more specific about the guarantees (or lack thereof) that this function makes. The second commit explicitly documents that lifetimes are currently not included in the output (since this bit me particularly hard recently).

…d_files, r=alexcrichton

Change `WorkProduct::saved_files` to an `Option`.

Because there is at most one file.

r? @bjorn3

…E0228, r=petrochenkov

add long error explanation for E0228

Add long explanation for the E0228 error code
Part of rust-lang#61137

Let me know if this is wrong at all (or can be written more clearly), I'm still learning Rust.

…an-DPC

Clean up E0581 explanation

r? @Dylan-DPC

…hewjasper

Add doc comment for `rustc_middle::mir::mono::Linkage`

Warn against thread::sleep in async fn

I've seen `thread::sleep` wrecking havoc in async servers. There's already an [issue for clippy](rust-lang/rust-clippy#4377), but the std docs could warn against it too.

…atsakis

Remove UnnormalizedProjection

This was only used for the old chalk integration with chalk-engine

r? @nikomatsakis

Update books

## book

2 commits in e37c0e84e2ef73d3a4ebffda8011db6814a3b02d..6247be15a7f7509559f7981ee2209b9e0cc121df
2020-04-26 09:31:36 -0500 to 2020-05-03 10:55:09 -0500
- Fix guessing game listing explanation (rust-lang/book#2321)
- Update ch01-01-installation.md (rust-lang/book#2325)

## edition-guide

1 commits in 8204c1d123472cd17f0c1c5c77300ae802eb0271..49270740c7a4bff2763e6bc730b191d45b7d5167
2020-04-09 18:55:50 -0700 to 2020-05-11 08:50:29 -0500
- Use rust-lang/rust linkchecker on CI. (rust-lang/edition-guide#197)

## embedded-book

1 commits in 40beccdf1bb8eb9184a2e3b42db8b8c6e394247f..366c50a03bed928589771eba8a6f18e0c0c01d23
2020-04-26 17:44:14 +0000 to 2020-05-07 09:04:42 +0000
- Add HAL patterns/guidelines/recommendations  (rust-embedded/book#235)

## nomicon

3 commits in 4d2d275997746d35eabfc4d992dfbdcce2f626ed..d1517d4e3f29264c5c67bce2658516bb5202c800
2020-04-27 10:24:52 -0400 to 2020-05-12 13:47:00 -0400
- Rename Unique::empty to Unique::dangling
- Use simpler link syntax
- Replace catch_panic by catch_unwind

## reference

3 commits in ed22e6fbfcb6ce436e9ea3b4bb4a55b2fb50a57e..892b928b565e35d25b6f9c47faee03b94bc41489
2020-04-24 12:46:22 -0700 to 2020-05-11 11:13:51 -0700
- clarify that str data must still be initialized
- remove language-level UB for non-UTF-8 str
- Replace incorrect term "parent modules" with "ancestor modules". (rust-lang/reference#806)

## rust-by-example

2 commits in ffc99581689fe2455908aaef5f5cf50dd03bb8f5..ab072b14393cbd9e8a1d1d75879bf51e27217bbb
2020-04-24 15:05:04 -0300 to 2020-05-09 08:46:39 -0300
- Fix link of formatting traits (rust-lang/rust-by-example#1346)
- Remove stale footnote (rust-lang/rust-by-example#1345)