…info_upvar_ops_sequence.

…R borrowck.

…tsakis

Future-proof MIR for dedicated debuginfo.

This is rust-lang#56231 without the last commit (the one that actually moves to `VarDebuginfo`).
Nothing should be broken, but it should no longer depend on debuginfo for anything else.

r? @nikomatsakis

Stabilize futures_api

cc rust-lang#59725.
Based on rust-lang#59733 and rust-lang#59119 -- only the last two commits here are relevant.

r? @withoutboats , @oli-obk for the introduction of `rustc_allow_const_fn_ptr`.

…r=Manishearth

Fix dark css rule

Fixes rust-lang#59817.

r? @rust-lang/rustdoc

…chton

Update cargo, books

## cargo

5 commits in b6581d383ed596b133e330011658c6f83cf85c2f..6be12653dcefb46ee7b605f063ee75b5e6cba513
2019-04-16 16:02:11 +0000 to 2019-04-19 15:05:03 +0000
- Improved docs for `maintenance` options (rust-lang/cargo#6863)
- publish-lockfile: Various updates (rust-lang/cargo#6840)
- Treat HTTP/2 stream errors as spurious network errors. (rust-lang/cargo#6861)
- Validate registry token before operations that require it. (rust-lang/cargo#6854)
- Cleanups wrt DYLD_FALLBACK_LIBRARY_PATH handling (rust-lang/cargo#6856)

## reference

2 commits in 98f90ff..2a2de9c
2019-04-06 09:29:08 -0700 to 2019-04-22 10:25:52 -0700
- Remove unused link references. (rust-lang/reference#560)
- Fix attribute redirects. (rust-lang/reference#562)

## book

22 commits in b93ec30bbc7b1b5c2f44223249ab359bed2ed5a6..db919bc6bb9071566e9c4f05053672133eaac33e
2019-03-26 16:54:10 -0400 to 2019-04-15 20:11:03 -0400
- Link to chapters mentioned in chapter 12
- Split up a long sentence
- Unclear wording 4.3 (rust-lang/book#1907)
- Corrected error for array out of bounds (rust-lang/book#1900)
- Make lifetime explanation clearer (rust-lang/book#1901)
- Replace `T: 'a + Messenger` with `T: Messenger` (rust-lang/book#1831)
- Update range so matches rust-fmt . (rust-lang/book#1890)
- Adding trailing comma (rust-lang/book#1891)
- point 2018 book redirects to existing pages instead of index (rust-lang/book#1919)
- Update ch04-03-slices.md (rust-lang/book#1921)
- Update link for Russian translation. (rust-lang/book#1915)
- Ch7 layout (rust-lang/book#1917)
- Update the version of mdbook we use in-tree to match rust-lang/rust (rust-lang/book#1912)
- Fix spellingz
- Update listings in ch 19-6 for nostarch
- Add a high-level overview of the changes in this version of the book
- Fix Travis CI badge url (rust-lang/book#1893)
- Redo listing numbers in chapter 19 after removals
- Remove Advanced Lifetimes section completely
- Merge branch 'gh1780'
- Merge remote-tracking branch 'origin/master' into gh1567
- remove lifetime subtyping

## rust-by-example

4 commits in f68ef3d0f4959f6a7d92a08d9994b117f0f4d32d..1ff0f8e018838a710ebc0cc1a7bf74ebe73ad9f1
2019-03-12 15:32:12 -0300 to 2019-04-15 08:15:32 -0300
- Fix borrow so it fails in 2018 edition Fixes rust-lang/rust-by-example#1141 (rust-lang/rust-by-example#1152)
- Replace lvalue and rvalue with place and value (rust-lang/rust-by-example#1160)
- Mutate array in iter_mut() example (rust-lang/rust-by-example#1165)
- Fix a typo ("half" -> "halve") (rust-lang/rust-by-example#1172)

## rustc-guide

8 commits in 464cb5b166378dff64619081dd4c42533a1eb989..99e1b1d53656be08654df399fc200584aebb50e4
2019-03-23 18:39:14 -0500 to 2019-04-20 09:57:54 -0500
- Update BodyId description
- Update test-implementation chapter to current code
- update chalk with new organization
- move to subsection
- fix MovePathIndex link
- Update query chapter for the query macro rewrite
- subchapter with information about `--error-format json`
- Update query-evaluation-model-in-detail.md

## edition-guide

1 commits in b56ddb11548450a6df4edd1ed571b2bc304eb9e6..c413d42a207bd082f801ec0137c31b71e4bfed4c
2019-03-10 10:23:16 +0100 to 2019-04-22 01:14:56 +0200
- fix command (rust-lang/edition-guide#155)

## embedded-book

1 commits in 7989c723607ef5b13b57208022259e6c771e11d0..de3d55f521e657863df45260ebbca1b10527f662
2019-04-04 12:14:37 +0000 to 2019-04-22 12:58:28 +0000
- Minor fixes  (rust-embedded/book#185)

## nomicon

6 commits in c02e0e7754a76886e55b976a3a4fac20100cd35d..fb29b147be4d9a1f8e24aba753a7e1de537abf61
2019-03-25 16:52:56 -0400 to 2019-04-22 19:10:29 -0400
- Fix link to copy_nonoverlapping (rust-lang/nomicon#134)
- Various unchecked-uninit improvements (rust-lang/nomicon#130)
- OOM behaviour in `vec-alloc.md` (rust-lang/nomicon#133)
- Added missing "things". (rust-lang/nomicon#131)
- Fix number agreement in subtyping chapter (rust-lang/nomicon#128)
- Minor improvements (rust-lang/nomicon#129)

Temporarily accept [i|u][32|size] suffixes on a tuple index and warn

Fix rust-lang#60138.

rust-lang#59553 will need to be kept open to track the change back to rejecting this code a few versions down thee line.

…excrichton

Don't generate unnecessary rmeta files.

As per rust-lang#60006 (comment).

r? @alexcrichton