Add `rustc_middle::ty::suggest_constraining_type_params` that suggests
adding multiple constraints.

`suggest_constraining_type_param` now just forwards params to this new
function.

Continuation of rust-lang#94376.

cc rust-lang#53667

…ted from a macro

Previously we've only suggested adding `Copy` bounds when the type being
moved/copied is a type parameter (generic). With this commit we also
suggest adding bounds when a type
- Can be copy
- All predicates that need to be satisfied for that are based on type
  params

i.e. we will suggest `T: Copy` for `Option<T>`, but won't suggest
anything for `Option<String>`.

Future work: it would be nice to also suggest adding `.clone()` calls

…olnay

Add a `process_group` method to UNIX `CommandExt`

- Tracking issue: rust-lang#93857
- RFC: rust-lang/rfcs#3228

Add a `process_group` method to `std::os::unix::process::CommandExt` that
allows setting the process group id (i.e. calling `setpgid`) in the child, thus
enabling users to set process groups while leveraging the `posix_spawn` fast
path.

…ebank

Adt copy suggestions

Previously we've only suggested adding `Copy` bounds when the type being moved/copied is a type parameter (generic). With this PR we also suggest adding bounds when a type
- Can be copy
- All predicates that need to be satisfied for that are based on type params

i.e. we will suggest `T: Copy` for `Option<T>`, but won't suggest anything for `Option<String>`.

An example:
```rust
fn duplicate<T>(t: Option<T>) -> (Option<T>, Option<T>) {
    (t, t)
}
```
New error (current compiler doesn't provide `help`:):
```text
error[E0382]: use of moved value: `t`
 --> t.rs:2:9
  |
1 | fn duplicate<T>(t: Option<T>) -> (Option<T>, Option<T>) {
  |                 - move occurs because `t` has type `Option<T>`, which does not implement the `Copy` trait
2 |     (t, t)
  |      -  ^ value used here after move
  |      |
  |      value moved here
  |
help: consider restricting type parameter `T`
  |
1 | fn duplicate<T: Copy>(t: Option<T>) -> (Option<T>, Option<T>) {
  |               ++++++
```

Fixes rust-lang#93623
r? `@estebank`
`@rustbot` label +A-diagnostics +A-suggestion-diagnostics +C-enhancement

----

I'm not at all sure if this is the right implementation for this kind of suggestion, but it seems to work :')

…henkov

Improve allowness of the unexpected_cfgs lint

This pull-request improve the allowness (`#[allow(...)]`) of the `unexpected_cfgs` lint.

Before this PR only crate level `#![allow(unexpected_cfgs)]` worked, now with this PR it also work when put around `cfg!` or if it is in a upper level. Making it work ~for the attributes `cfg`, `cfg_attr`, ...~ for the same level is awkward as the current code is design to give "Some parent node that is close to this macro call" (cf. https://doc.rust-lang.org/nightly/nightly-rustc/rustc_expand/base/struct.ExpansionData.html) meaning that allow on the same line as an attribute won't work. I'm note even sure if this would be possible.

Found while working on rust-lang#94298.
r? ``@petrochenkov``

…an-DPC

7 - Make more use of `let_chains`

Continuation of rust-lang#94376.

cc rust-lang#53667

…a-doc-link, r=notriddle

Fix panic when handling intra doc links generated from macro

Fixes rust-lang#78591.
Fixes rust-lang#92789.

r? `@notriddle`

compiler: fix some typos

Update books

## nomicon

1 commits in 90993eeac93dbf9388992de92965f99cf6f29a03..f6d6126fc96ecf4a7f7d22da330df9506293b0d0
2022-02-13 12:44:12 +0900 to 2022-02-26 02:21:21 +0900
- ffi: explicitly declare hello_from_rust for C99 (rust-lang/nomicon#343)

## reference

20 commits in 70fc73a6b908e08e66aa0306856c5211312f6c05..9d289c05fce7254b99c6a0d354d84abb7fd7a032
2022-02-14 19:33:01 -0800 to 2022-02-23 08:58:20 -0800
- Fix typo in `functions.md` (rust-lang/reference#1173)
- Fix CI
- Unify global_asm/asm directive list
- Update src/inline-assembly.md
- Update src/inline-assembly.md
- Fix changes unintentional reverted in d5d3d80
- Add note about operand interpolations
- Sort lists, add syntax control directives
- Add another missed batch suggestion
- Add missed batch suggestion
- Apply suggestions from code review
- Add .type, .size, and .p2align
- Reformat directive lists
- Add `.inst` directive
- Add missing directives
- Add additional directives in use
- Add `.fill` directive
- Style fixes
- Fix code block
- Add supported Directives list

## book

13 commits in 67b768c0b660a069a45f0e5d8ae2f679df1022ab..3f255ed40b8c82a0434088568fbed270dc31bf00
2022-02-09 21:52:41 -0500 to 2022-02-27 21:26:12 -0500
- Add a back reference about enum variant initializer fns. Fixes rust-lang/book#800.
- Update ch01-03-hello-cargo.md
- ch03-05: Add definite article for the block of code
- Change variable names from "slice" to "values"
- Remove reference to advanced lifetime section that no longer exists
- Fix link to go to the right newtype section
- Remove confusing and redundant part of a sentence about newtypes
- Make transition less repetitive
- Correct wording about associated functions.
- Remove unnecessary extern crate proc_macro
- Clarify that this code is defining, not using a procedural macro
- Add manual regeneration steps for cargo new test
- Update Listing 11-1 to reflect current contents

## rust-by-example

11 commits in 18c0055b8aea49391e8f758a4400097999c9cf1e..2a928483a20bb306a7399c0468234db90d89afb5
2022-01-19 08:51:55 -0300 to 2022-02-28 11:36:59 -0300
- Update destructure_slice.md (rust-lang/rust-by-example#1513)
- Update iter_find.md (rust-lang/rust-by-example#1512)
- Add an example of collecting errors while iterating successes (rust-lang/rust-by-example#1509)
- Fix broken link on asm (rust-lang/rust-by-example#1508)
- Update abort_unwind.md (rust-lang/rust-by-example#1505)
- Remove duplicate text in asm.md (rust-lang/rust-by-example#1506)
- Improve asm clobber example (rust-lang/rust-by-example#1504)
- Add +1 to next_age (rust-lang/rust-by-example#1503)
- fix comment on into_iter() for arrays (rust-lang/rust-by-example#1502)
- Added new Rust 1.58 direct format args (rust-lang/rust-by-example#1501)
- documentation for cfg_panic (rust-lang/rust-by-example#1500)

## rustc-dev-guide

13 commits in 62f58394ba7b203f55ac35ddcc4c0b79578f5706..32f2a5b4e7545318846185198542230170dd8a42
2022-02-11 08:42:50 -0500 to 2022-03-01 10:45:24 -0600
- Add architecture suggestion for Apple silicon (rust-lang/rustc-dev-guide#1320)
- cargo timings has been stabilized (rust-lang/rustc-dev-guide#1319)
- Add known-bug header. (rust-lang/rustc-dev-guide#1311)
- Fix typo (rust-lang/rustc-dev-guide#1315)
- Typo (rust-lang/rustc-dev-guide#1313)
- instrument-coverage has been stabilized.
- symbol-mangling-version has been stabilized
- Fix `Ty` link (rust-lang/rustc-dev-guide#1308)
- Edit glossary (rust-lang/rustc-dev-guide#1302)
- Fix heading levels in the query chapter (rust-lang/rustc-dev-guide#1305)
- Fix link
- Edit "Queries" chapter (rust-lang/rustc-dev-guide#1301)
- Link to The Rust Performance Book (rust-lang/rustc-dev-guide#1300)

## edition-guide

1 commits in beea0a3cdc3885375342fd010f9ad658e6a5e09a..c55611dd6c58bdeb52423b5c52fd0f3c93615ba8
2021-12-05 07:06:45 -0800 to 2022-02-21 14:21:39 +0100
- Remove `+nightly` for `cargo new` (rust-lang/edition-guide#276)