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Rollup of 11 pull requests #77245

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wants to merge 24 commits into from
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Rollup of 11 pull requests #77245

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jonas-schievink
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Successful merges:

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r? @ghost

GuillaumeGomez and others added 24 commits September 21, 2020 13:32
Delimiters cannot appear as isolated tokens in a token stream
Split out from #76130

This tests our handling of combining derives, derive helper
attributes, attribute macros, and `cfg`/`cfg_attr`
…Dylan-DPC

Add missing code examples on HashMap types

r? @Dylan-DPC
Add accessors to Command.

This adds some accessor methods to `Command` to provide a way to access the values set when building the `Command`. An example where this can be useful is to display the command to be executed. This is roughly based on the [`ProcessBuilder`](https://github.com/rust-lang/cargo/blob/13b73cdaf76b2d9182515c9cf26a8f68342d08ef/src/cargo/util/process_builder.rs#L105-L134) in Cargo.

Possible concerns about the API:
- Values with NULs on Unix will be returned as `"<string-with-nul>"`. I don't think it is practical to avoid this, since otherwise a whole separate copy of all the values would need to be kept in `Command`.
- Does not handle `arg0` on Unix. This can be awkward to support in `get_args` and is rarely used. I figure if someone really wants it, it can be added to `CommandExt` as a separate method.
- Does not offer a way to detect `env_clear`. I'm uncertain if it would be useful for anyone.
- Does not offer a way to get an environment variable by name (`get_env`). I figure this can be added later if anyone really wants it. I think the motivation for this is weak, though. Also, the API could be a little awkward (return a `Option<Option<&OsStr>>`?).
- `get_envs` could skip "cleared" entries and just return `&OsStr` values instead of `Option<&OsStr>`. I'm on the fence here. My use case is to display a shell command, and I only intend it to be roughly equivalent to the actual execution, and I probably won't display `None` entries. I erred on the side of providing extra information, but I suspect many situations will just filter out the `None`s.
- Could implement more iterator stuff (like `DoubleEndedIterator`).

I have not implemented new std items before, so I'm uncertain if the existing issue should be reused, or if a new tracking issue is needed.

cc #44434
Enable const propagation into operands at mir_opt_level=2

Feature was added in #74507 but gated with `mir_opt_level>=3` because of compile time regressions. Let's see whether the LLVM 11 update solves that.

As the [perf results](#77107 (comment)) show, enabling this optimization results in a lot less regression as before.

cc @oli-obk

r? @ghost
Update cargo

7 commits in 8777a6b1e8834899f51b7e09cc9b8d85b2417110..05c611ae3c4255b7a2bcf4fcfa65b20286a07839
2020-09-15 19:11:03 +0000 to 2020-09-23 23:10:38 +0000
- --workspace flag for locate-project to find the workspace root (rust-lang/cargo#8712)
- Remove some badges documentation. (rust-lang/cargo#8727)
- Add plain message format for locate-project (rust-lang/cargo#8707)
- Add a term option to configure the progress bar (rust-lang/cargo#8165)
- Replace d_as_f64 with as_secs_f64 (rust-lang/cargo#8721)
- Add cross check to filters_target test. (rust-lang/cargo#8713)
- Add test for whitespace behavior in env flags. (rust-lang/cargo#8706)
…ign-test, r=nagisa

Fix FIXME in core::num test: Check sign of zero in min/max tests.

r? nagisa

@rustbot modify labels: +C-cleanup
Rust vec bench import specific rand::RngCore

Using `RngCore` import for side effects is clearer than `*` which may bring it unnecessary more stuff than needed, it is also more explicit doing so.

@pickfire change `LEN = 16384` (and pos) and `once` instead of `[0].iter()` after this.

@rustbot modify labels: +C-cleanup +A-testsuite
Late link args order

MSYS2 changed how winpthreads is built and as the result it now depends on more mingw-w64 libraries.

This PR affects only MinGW targets since nobody else is using `late_link_args_{dynamic,static}`. Now the order is similar to how it used to be before #67502.
Move helper function for `missing_const_for_fn` out of rustc to clippy

cc @rust-lang/clippy @ecstatic-morse #76618

r? @Manishearth

I also removed all support for suggesting a function could be `const fn` when that would require feature gates to actually work.

This means we'll now have to maintain this ourselves in clippy, but that's how most lints work anyway, so...
pretty-print-reparse hack: Rename some variables for clarity

This will also make it easier to make the comparisons asymmetric.

Also one impossible case is removed.

r? @Aaron1011
Test more attributes in test issue-75930-derive-cfg.rs

Split out from #76130

This tests our handling of combining derives, derive helper
attributes, attribute macros, and `cfg`/`cfg_attr`
@jonas-schievink
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@bors r+ rollup=never p=11

@rustbot modify labels: rollup

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bors commented Sep 26, 2020

📌 Commit d0b22cf has been approved by jonas-schievink

@rustbot rustbot added the rollup A PR which is a rollup label Sep 26, 2020
@bors bors added the S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. label Sep 26, 2020
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bors commented Sep 26, 2020

⌛ Testing commit d0b22cf with merge a13adf5a90840af075e722ea7a1f107ad3773dad...

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bors commented Sep 26, 2020

💔 Test failed - checks-actions

@bors bors added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Sep 26, 2020
@jonas-schievink jonas-schievink deleted the rollup-in2zbd3 branch September 26, 2020 23:51
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