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Rollup of 9 pull requests #72681

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r? @ghost

a1phyr and others added 19 commits April 28, 2020 11:22
Co-authored-by: Ralf Jung <post@ralfj.de>
Impl Error for Infallible

This PR only changes the place where `impl Error for Infallible` is documented, as one could think that it is not the case when reading https://doc.rust-lang.org/nightly/std/convert/enum.Infallible.html.

Fixes rust-lang#70842
Tweak and stabilize AtomicN::fetch_update

The fetch_update method implements a compare-and-swap loop to update the value in an atomic to an arbitrary value computed by a closure.

I've applied a few tweaks suggested by @mystor in this comment on the tracking issue: rust-lang#48655 (comment). Specifically, the load and store ordering arguments have been swapped to match with the orderings of `compare_exchange`, and the closure has been moved from the first to last argument.

Moving the closure to the last argument is a change away from other methods on the atomic types which place the ordering(s) last, but matches with the broad convention that closure arguments come last in functions. In particular, rustfmt style lays calls with multi-line closures out more cleanly when the closure comes last.
…tolnay

Stabilization of weak-into-raw

Closes rust-lang#60728.

There are also two removals of `#![feature(weak_into_raw)]` in the `src/tools/miri` submodule. How should I synchronize the changes with there?

* I can ignore it for now and once this gets merged, update the tool, send a pull request to that one and then reference the changes to rustc.
* I could try submitting the changes to miri first, but then the build would fail there, because the attribute would still be needed.

I think the first one is the correct one, extrapolating from the contributing guidelines (even though they speak about breaking the tools and this should not break it, as extra feature should not hurt).
Stabilize AtomicN::fetch_min and AtomicN::fetch_max

Some architectures (ARMv8.1 LSE and RISC-V) have specific instructions for atomic min/max which the compiler can only generate through explicit instrinsics.
Clarified the documentation for Formatter::precision

Added a note that `precision` is interpreted as max-width when formatting strings
Stabilize str_strip feature

This PR stabilizes these APIs:

```rust
impl str {
    /// Returns a string slice with the prefix removed.
    ///
    /// If the string starts with the pattern `prefix`, `Some` is returned with the substring where
    /// the prefix is removed. Unlike `trim_start_matches`, this method removes the prefix exactly
    /// once.
    pub fn strip_prefix<'a, P: Pattern<'a>>(&'a self, prefix: P) -> Option<&'a str>;

    /// Returns a string slice with the suffix removed.
    ///
    /// If the string ends with the pattern `suffix`, `Some` is returned with the substring where
    /// the suffix is removed. Unlike `trim_end_matches`, this method removes the suffix exactly
    /// once.
    pub fn strip_suffix<'a, P>(&'a self, suffix: P) -> Option<&'a str>
    where
        P: Pattern<'a>,
        <P as Pattern<'a>>::Searcher: ReverseSearcher<'a>;
}
```

Closes  rust-lang#67302
Added a codegen test for a recent optimization for overflow-checks=on

Closes rust-lang#58692
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@bors r+ p=9 rollup=never

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bors commented May 28, 2020

📌 Commit 08cc539 has been approved by JohnTitor

@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 May 28, 2020
@JohnTitor JohnTitor added the rollup A PR which is a rollup label May 28, 2020
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bors commented May 28, 2020

⌛ Testing commit 08cc539 with merge a02e0d628e9fc72ec8be0371f7d89d29145484cb...

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bors commented May 28, 2020

💥 Test timed out

@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 May 28, 2020
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@bors retry

@bors bors removed the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label May 28, 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 May 28, 2020
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bors commented May 28, 2020

⌛ Testing commit 08cc539 with merge 2197671ab87fb8dd66dc6e799fb43304ad565967...

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bors commented May 28, 2020

💔 Test failed - checks-azure

@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 May 28, 2020
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Since the previous macOS build was successful, I'd say it's spurious:

failures:

---- [run-make] run-make-fulldeps/long-linker-command-lines stdout ----

error: make failed
status: exit code: 2
command: "make"
stdout:
------------------------------------------
DYLD_LIBRARY_PATH="/Users/runner/runners/2.168.2/work/1/s/build/x86_64-apple-darwin/test/run-make-fulldeps/long-linker-command-lines/long-linker-command-lines:/Users/runner/runners/2.168.2/work/1/s/build/x86_64-apple-darwin/stage2/lib:" '/Users/runner/runners/2.168.2/work/1/s/build/x86_64-apple-darwin/stage2/bin/rustc' --out-dir /Users/runner/runners/2.168.2/work/1/s/build/x86_64-apple-darwin/test/run-make-fulldeps/long-linker-command-lines/long-linker-command-lines -L /Users/runner/runners/2.168.2/work/1/s/build/x86_64-apple-darwin/test/run-make-fulldeps/long-linker-command-lines/long-linker-command-lines  foo.rs -g -O
RUSTC="/Users/runner/runners/2.168.2/work/1/s/build/x86_64-apple-darwin/stage2/bin/rustc" DYLD_LIBRARY_PATH="/Users/runner/runners/2.168.2/work/1/s/build/x86_64-apple-darwin/test/run-make-fulldeps/long-linker-command-lines/long-linker-command-lines:/Users/runner/runners/2.168.2/work/1/s/build/x86_64-apple-darwin/stage2/lib/rustlib/x86_64-apple-darwin/lib:" /Users/runner/runners/2.168.2/work/1/s/build/x86_64-apple-darwin/test/run-make-fulldeps/long-linker-command-lines/long-linker-command-lines/foo
attempt: 100
attempt: 200
attempt: 300

------------------------------------------
stderr:
------------------------------------------
warning: variable does not need to be mutable
  --> foo.rs:93:13
   |
93 |         for mut arg in linker_args.split('S') {
   |             ----^^^
   |             |
   |             help: remove this `mut`
   |
   = note: `#[warn(unused_mut)]` on by default

warning: 1 warning emitted

thread 'main' panicked at 'status: exit code: 1
stdout:

stderr:
error: could not exec the linker `/Users/runner/runners/2.168.2/work/1/s/build/x86_64-apple-darwin/test/run-make-fulldeps/long-linker-command-lines/long-linker-command-lines/foo`
  |

', foo.rs:76:13
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
make: *** [all] Error 101

@bors retry

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels May 28, 2020
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@bors r-

I am closing this since it'll be a while this gets merged and the queue will grow so might as well create a bigger one

@bors bors added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels May 28, 2020
@JohnTitor JohnTitor deleted the rollup-uh2cq5p branch May 28, 2020 19:04
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