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Rollup of 7 pull requests #90428

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@rustbot modify labels: rollup

Create a similar rollup

chrismit3s and others added 17 commits October 1, 2021 21:55
Co-authored-by: r00ster <r00ster91@protonmail.com>
Co-authored-by: Jane Lusby <jlusby42@gmail.com>
The unifying theme for this commit is weak, admittedly. I put together a
list of "expensive" functions when I originally proposed this whole
effort, but nobody's cared about that criterion. Still, it's a decent
way to bite off a not-too-big chunk of work.

Given the grab bag nature of this commit, the messages I used vary quite
a bit.
Closes rust-lang#81383.

Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
…riplett

Add paragraph to ControlFlow docs to menion it works with the ? operator (rust-lang#88715)

fixes rust-lang#88715

r? ``@steveklabnik``
…=joshtriplett

Stabilize `is_symlink()` for `Metadata` and `Path`

I'm not fully sure about `since` version, correct me if I'm wrong

Needs update after stabilization: [cargo-test-support](https://github.com/rust-lang/cargo/blob/8063672238a5b6c3a901c0fc17f3164692d0be85/crates/cargo-test-support/src/paths.rs#L202)

Linked issue: rust-lang#85748
…joshtriplett

Add #[must_use] to Rc::downgrade

Missed this in previous PR rust-lang#89796 (comment)

Parent issue: rust-lang#89692

r? ``@joshtriplett``
…ations, r=joshtriplett

Add #[must_use] to expensive computations

The unifying theme for this commit is weak, admittedly. I put together a list of "expensive" functions when I originally proposed this whole effort, but nobody's cared about that criterion. Still, it's a decent way to bite off a not-too-big chunk of work.

Given the grab bag nature of this commit, the messages I used vary quite a bit. I'm open to wording changes.

For some reason clippy flagged four `BTreeSet` methods but didn't say boo about equivalent ones on `HashSet`. I stared at them for a while but I can't figure out the difference so I added the `HashSet` ones in.

```rust
// Flagged by clippy.
alloc::collections::btree_set::BTreeSet<T>   fn difference<'a>(&'a self, other: &'a BTreeSet<T>) -> Difference<'a, T>;
alloc::collections::btree_set::BTreeSet<T>   fn symmetric_difference<'a>(&'a self, other: &'a BTreeSet<T>) -> SymmetricDifference<'a, T>
alloc::collections::btree_set::BTreeSet<T>   fn intersection<'a>(&'a self, other: &'a BTreeSet<T>) -> Intersection<'a, T>;
alloc::collections::btree_set::BTreeSet<T>   fn union<'a>(&'a self, other: &'a BTreeSet<T>) -> Union<'a, T>;

// Ignored by clippy, but not by me.
std::collections::HashSet<T, S>              fn difference<'a>(&'a self, other: &'a HashSet<T, S>) -> Difference<'a, T, S>;
std::collections::HashSet<T, S>              fn symmetric_difference<'a>(&'a self, other: &'a HashSet<T, S>) -> SymmetricDifference<'a, T, S>
std::collections::HashSet<T, S>              fn intersection<'a>(&'a self, other: &'a HashSet<T, S>) -> Intersection<'a, T, S>;
std::collections::HashSet<T, S>              fn union<'a>(&'a self, other: &'a HashSet<T, S>) -> Union<'a, T, S>;
```

Parent issue: rust-lang#89692

r? ``@joshtriplett``
…s, r=joshtriplett

Add #[must_use] to mem/ptr functions

There's a lot of low-level / unsafe stuff here. Are there legit use cases for ignoring any of these return values?

* No regressions in `./x.py test --stage 1 library/std src/tools/clippy`.
* One regression in `./x.py test --stage 1 src/test/ui`. Fixed.
* I am unable to run `./x.py doc` on my machine so I'll need to wait for the CI to verify doctests pass. I eyeballed all the adjacent tests and they all look okay.

Parent issue: rust-lang#89692

r? ``@joshtriplett``
…lett

Add #[must_use] to remaining core functions

I've run out of compelling reasons to group functions together across crates so I'm just going to go module-by-module. This is everything remaining from the `core` crate.

Ignored by clippy for reasons unknown:

```rust
core::alloc::Layout   unsafe fn for_value_raw<T: ?Sized>(t: *const T) -> Self;
core::any             const fn type_name_of_val<T: ?Sized>(_val: &T) -> &'static str;
```

Ignored by clippy because of `mut`:

```rust
str   fn split_at_mut(&mut self, mid: usize) -> (&mut str, &mut str);
```

<del>
Ignored by clippy presumably because a caller might want `f` called for side effects. That seems like a bad usage of `map` to me.

```rust
core::cell::Ref<'b, T>   fn map<U: ?Sized, F>(orig: Ref<'b, T>, f: F) -> Ref<'b, T>;
core::cell::Ref<'b, T>   fn map_split<U: ?Sized, V: ?Sized, F>(orig: Ref<'b, T>, f: F) -> (Ref<'b, U>, Ref<'b, V>);
```
</del>

Parent issue: rust-lang#89692

r? ``@joshtriplett``
…olnay

Stabilize `option_result_unwrap_unchecked`

Closes rust-lang#81383.

Stabilization report: rust-lang#81383 (comment).

``@rustbot`` label +A-option-result +T-libs-api
@rustbot rustbot added the rollup A PR which is a rollup label Oct 31, 2021
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@bors r+ p=7 rollup=never

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bors commented Oct 31, 2021

📌 Commit ca6d37b has been approved by matthiaskrgr

@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 Oct 31, 2021
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bors commented Oct 31, 2021

⌛ Testing commit ca6d37b with merge edf8598155471bef2b1df00cc3fc0e46e49b3503...

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The job x86_64-gnu-tools failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)
.......... (40/50)
.......... (50/50)


An exception occured: Failed to launch the browser process!
Inconsistency detected by ld.so: dl-tls.c: 493: _dl_allocate_tls_init: Assertion `listp->slotinfo[cnt].gen <= GL(dl_tls_generation)' failed!


TROUBLESHOOTING: https://github.com/puppeteer/puppeteer/blob/master/docs/troubleshooting.md
== STACKTRACE ==
Error
Error
    at innerRunTestCode (/node-v14.4.0-linux-x64/lib/node_modules/browser-ui-test/src/index.js:442:16)
    at processTicksAndRejections (internal/process/task_queues.js:97:5)
    at async main (/checkout/src/tools/rustdoc-gui/tester.js:223:13)


command did not execute successfully: "/node-v14.4.0-linux-x64/bin/node" "/checkout/src/tools/rustdoc-gui/tester.js" "--jobs" "16" "--doc-folder" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/rustdoc-gui/doc" "--tests-folder" "/checkout/src/test/rustdoc-gui"


Build completed unsuccessfully in 0:00:17

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bors commented Oct 31, 2021

💔 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 Oct 31, 2021
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Mhh, might be a spurious error...

@matthiaskrgr matthiaskrgr deleted the rollup-hvgz1od branch November 20, 2021 15:04
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