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Remove mem::transmute used in Box<str> conversions
Given that https://github.com/rust-lang/rust/pull/44877 is failing, I decided to make a separate PR. This is done with the same motivation: to avoid `mem::transmute`-ing non `#[repr(C)]` types.
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Update docs for process::abort
Remove a typo and explain the relationship to `panic!`.
Part of #29370
r? @steveklabnik
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make `backtrace = false` compile for windows targets.
when building for windows with `backtrace = false`, `libstd` fails to compile because some modules that use items from `sys_common::backtrace::*` are still included, even though those modules aren't used or referenced by anything.
`sys_common::backtrace` doesn't exist when the backtrace feature is turned off.
--
i've also added `#[cfg(feature = "backtrace")]` to various items that exist exclusively to support `mod backtrace` since the compilation would fail since they would be unused in a configuration with backtraces turned off.
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Made `fs::copy` return the length of the main stream
On Windows with the NTFS filesystem, `fs::copy` would return the sum of the
lengths of all streams, which can be different from the length reported by
`metadata` and thus confusing for users unaware of this NTFS peculiarity.
This makes `fs::copy` return the same length `metadata` reports which is the
value it used to return before PR #26751. Note that alternate streams are still
copied; their length is just not included in the returned value.
This change relies on the assumption that the stream with index 1 is always the
main stream in the `CopyFileEx` callback. I could not find any official
document confirming this but empirical testing has shown this to be true,
regardless of whether the alternate stream is created before or after the main
stream.
Resolves #44532
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The innermost type is not [u8] on all platforms but is assumed to have
the same memory layout as [u8] since this conversion was done via
mem::transmute before.
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Rollup of 15 pull requests
- Successful merges: #44124, #44287, #44320, #44694, #44708, #44794, #44797, #44824, #44836, #44840, #44845, #44854, #44889, #44900, #44903
- Failed merges:
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Backport libs stabilizations to 1.21 beta
Includes the following stabilizations:
- tcpstream_connect_timeout https://github.com/rust-lang/rust/pull/44563
- iterator_for_each https://github.com/rust-lang/rust/pull/44567
- ord_max_min https://github.com/rust-lang/rust/pull/44593
- compiler_fences https://github.com/rust-lang/rust/pull/44595
- needs_drop https://github.com/rust-lang/rust/pull/44639
- vec_splice https://github.com/rust-lang/rust/pull/44640
These have been backported in https://github.com/rust-lang/rust/pull/44823.
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docs improvement std::sync::{PoisonError, TryLockError}
Addresses the `PoisonError` and `TryLockError` parts of #29377.
Adds examples and links.
r? @steveklabnik
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Add doc example to HashMap::hasher
None
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Add blanket TryFrom impl when From is implemented.
Adds `impl<T, U> TryFrom<T> for U where U: From<T>`.
Removes `impl<'a, T> TryFrom<&'a str> for T where T: FromStr` (originally added in #40281) due to overlapping impls caused by the new blanket impl. This removal is to be discussed further on the tracking issue for TryFrom.
Refs #33417.
/cc @sfackler, @scottmcm (thank you for the help!), and @aturon
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Allow replacing HashMap entries
This is an obvious API hole. At the moment the only way to retrieve an entry from a `HashMap` is to get an entry to it, remove it, and then insert a new entry. This PR allows entries to be replaced.
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This is the name the `gcc` crate has moved to
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On Windows with the NTFS filesystem, `fs::copy` would return the sum of the
lengths of all streams, which can be different from the length reported by
`metadata` and thus confusing for users unaware of this NTFS peculiarity.
This makes `fs::copy` return the same length `metadata` reports which is the
value it used to return before PR #26751. Note that alternate streams are still
copied; their length is just not included in the returned value.
This change relies on the assumption that the stream with index 1 is always the
main stream in the `CopyFileEx` callback. I could not find any official
document confirming this but empirical testing has shown this to be true,
regardless of whether the alternate stream is created before or after the main
stream.
Resolves #44532
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As per #29370
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As per #29370
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This includes the following stabilizations:
- tcpstream_connect_timeout https://github.com/rust-lang/rust/pull/44563
- iterator_for_each https://github.com/rust-lang/rust/pull/44567
- ord_max_min https://github.com/rust-lang/rust/pull/44593
- compiler_fences https://github.com/rust-lang/rust/pull/44595
- needs_drop https://github.com/rust-lang/rust/pull/44639
- vec_splice https://github.com/rust-lang/rust/pull/44640
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Indicate how ChildStd{in,out,err} FDs are closed.
Fixes https://github.com/rust-lang/rust/issues/41452.
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Add Duration::from_micros
This fixes #44400 that explains why it could be useful for embedded designs timing.
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std::sync::RwLock docs improvement
Addresses the `RwLock` part of #29377.
r? @steveklabnik
Added examples, links to types, and a small comparison between RwLock and Mutex.
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improve english in create_dir_all docs
Just minor nitpicking.
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fix an incorrect assertion in the doc example for `std::io::copy`
I think this wasn't caught by CI because the `foo` wrapper function was only defined and not called. This seems to be the norm for doc examples that define a `foo` function. Is that on purpose?
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Expand size_of docs
This PR does 3 things.
1. Adds a description of what pointer size means to the primitive pages for usize and isize.
2. Says the general size of things is not stable from compiler to compiler.
3. Adds a table of sizes of things that we do guarantee. As this is the first table in the libstd docs, I've included a picture of how that looks.

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Retain suid/sgid/sticky bits in Metadata.permissions
Most users would expect set_permissions(Metadata.permissions()) to be
non-destructive. While we can't guarantee this, we can at least pass
the needed info to chmod.
Also update the PermissionsExt documentation to disambiguate what it
contains, and to refer to the underlying value as `st_mode` rather than
its type `mode_t`.
Closes #44147
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Correctly bubble up errors from libbacktrace
Previously the first part of this code didn't check for a null pointer and blindly passed it back down, causing a segfault if libbacktrace failed to initialise. I've changed this to check and bubble up the error if relevant.
Suggested diff view: https://github.com/rust-lang/rust/pull/44525/files?w=1
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Add some missing links in io docs
r? @rust-lang/docs
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[Redox] Sync with upstream syscall library
This syncs the vendored syscalls with their upstream versions.
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hide internal types/traits from std docs via new #[doc(masked)] attribute
Fixes #43701 (hopefully for good this time)
This PR introduces a new parameter to the `#[doc]` attribute that rustdoc looks for on `extern crate` statements. When it sees `#[doc(masked)]` on such a statement, it hides traits and types from that crate from appearing in either the "Trait Implementations" section of many type pages, or the "Implementors" section of trait pages. This is then applied to the `libc`/`rand`/`compiler_builtins` imports in libstd to prevent those crates from creating broken links in the std docs.
Like in #43348, this also introduces a feature gate, `doc_masked`, that controls the use of this parameter.
To view the std docs generated with this change, head to https://tonberry.quietmisdreavus.net/std-43701/std/index.html.
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