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This commit is an attempt to force `Instant::now` to be monotonic
through any means possible. We tried relying on OS/hardware/clock
implementations, but those seem buggy enough that we can't rely on them
in practice. This commit implements the same hammer Firefox recently
implemented (noted in #56612) which is to just keep whatever the lastest
`Instant::now()` return value was in memory, returning that instead of
the OS looks like it's moving backwards.
Closes #48514
Closes #49281
cc #51648
cc #56560
Closes #56612
Closes #56940
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Fix repeated word typos
Inspired by #57295 (I skipped 'be be' because of it) and my [PR in another repo
](https://github.com/e-maxx-eng/e-maxx-eng/pull/389)
Not a stupid `sed`, I actually tried to fix case by case.
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Fix backtraces for inlined functions on Windows
Fixes an regression introduced in https://github.com/rust-lang/rust/pull/50526
r? @alexcrichton
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Found with `git grep -P '\b([a-z]+)\s+\1\b'`
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Always run rustc in a thread
cc @ishitatsuyuki @eddyb
r? @pnkfelix
[Previously](https://github.com/rust-lang/rust/pull/48575) we moved to only producing threads when absolutely necessary. Even before we opted to only create threads in some cases, which [is unsound](https://github.com/rust-lang/rust/pull/48575#issuecomment-380635967) due to the way we use thread local storage.
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Remove dependency on shell32.dll
Closes #56510 if it works on MinGW (I've only tested it on MSVC).
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Add checked_add method to Instant time type
Appending functionality to the already opened topic of `checked_add` on time types over at #55940.
Doing checked addition between an `Instant` and a `Duration` is important to reliably determine a future instant. We could use this in the `parking_lot` crate to compute an instant when in the future to wake a thread up without risking a panic.
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* Update bootstrap compiler
* Update version to 1.33.0
* Remove some `#[cfg(stage0)]` annotations
Actually updating the version number is blocked on updating Cargo
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Rewrite it to not use `if let`.
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Add comments explaining how we test this,
and use a slice for debugging instead of a clone of the iterator.
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Switch to vec::IntoIter as our backing double-ended iterator.
Fix incorrect comment.
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Rollup of 7 pull requests
Successful merges:
- #56000 (Add Armv8-M Mainline targets)
- #56250 (Introduce ptr::hash for references)
- #56434 (Improve query cycle errors for parallel queries)
- #56516 (Replace usages of `..i + 1` ranges with `..=i`.)
- #56555 (Send textual profile data to stderr, not stdout)
- #56561 (Fix bug in from_key_hashed_nocheck)
- #56574 (Fix a stutter in the docs for slice::exact_chunks)
Failed merges:
r? @ghost
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Replace usages of `..i + 1` ranges with `..=i`.
Before this change we were using old computer code techniques. After this change we use the new and improved computer code techniques.
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cleanup: remove static lifetimes from consts in libstd
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Utilize `?` instead of `return None`.
None
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Remove some uses of try!
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Implement checked_add_duration for SystemTime
[Original discussion on the rust user forum](https://users.rust-lang.org/t/std-systemtime-misses-a-checked-add-function/21785)
Since `SystemTime` is opaque there is no way to check if the result of an addition will be in bounds. That makes the `Add<Duration>` trait completely unusable with untrusted data. This is a big problem because adding a `Duration` to `UNIX_EPOCH` is the standard way of constructing a `SystemTime` from a unix timestamp.
This PR implements `checked_add_duration(&self, &Duration) -> Option<SystemTime>` for `std::time::SystemTime` and as a prerequisite also for all platform specific time structs. This also led to the refactoring of many `add_duration(&self, &Duration) -> SystemTime` functions to avoid redundancy (they now unwrap the result of `checked_add_duration`).
Some basic unit tests for the newly introduced function were added too.
I wasn't sure which stabilization attribute to add to the newly introduced function, so I just chose `#[stable(feature = "time_checked_add", since = "1.32.0")]` for now to make it compile. Please let me know how I should change it or if I violated any other conventions.
P.S.: I could only test on Linux so far, so I don't necessarily expect it to compile for all platforms.
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Since SystemTime is opaque there is no way to check if the result
of an addition will be in bounds. That makes the Add<Duration>
trait completely unusable with untrusted data. This is a big problem
because adding a Duration to UNIX_EPOCH is the standard way of
constructing a SystemTime from a unix timestamp.
This commit implements checked_add_duration(&self, &Duration) -> Option<SystemTime>
for std::time::SystemTime and as a prerequisite also for all platform
specific time structs. This also led to the refactoring of many
add_duration(&self, &Duration) -> SystemTime functions to avoid
redundancy (they now unwrap the result of checked_add_duration).
Some basic unit tests for the newly introduced function were added
too.
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This commit deletes the `alloc_system` crate from the standard
distribution. This unstable crate is no longer needed in the modern
stable global allocator world, but rather its functionality is folded
directly into the standard library. The standard library was already the
only stable location to access this crate, and as a result this should
not affect any stable code.
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set cfg(rustdoc) when rustdoc is running on a crate
When using `#[doc(cfg)]` to document platform-specific items, it's a little cumbersome to get all the platforms' items to appear all at once. For example, the standard library adds `--cfg dox` to rustdoc's command line whenever it builds docs, and the documentation for `#![feature(doc_cfg)]` suggests using a Cargo feature to approximate the same thing. This is a little awkward, because you always need to remember to set `--features dox` whenever you build documentation.
This PR proposes making rustdoc set `#[cfg(rustdoc)]` whenever it runs on a crate, to provide an officially-sanctioned version of this that is set automatically. This way, there's a standardized way to declare that a certain version of an item is specifically when building docs.
To try to prevent the spread of this feature from happening too quickly, this PR also restricts the use of this flag to whenever `#![feature(doc_cfg)]` is active. I'm sure there are other uses for this, but right now i'm tying it to this feature. (If it makes more sense to give this its own feature, i can easily do that.)
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`bad_style` is being deprecated in favor of `nonstandard_style`:
- https://github.com/rust-lang/rust/issues/41646
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