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The paragraph described a case where we can't optimize away repetitive
dynamic stack allocation. However, as arielb1 pointed out, it can
actually optimizable by dynamically delaying the stack unwinding.
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`Self` in type definitions (self_in_typedefs)
This implements the [`self_in_typedefs` feature](https://github.com/rust-lang/rfcs/blob/master/text/2300-self-in-typedefs.md) ([tracking issue 49303](https://github.com/rust-lang/rust/issues/49303)).
r? @eddyb
CC @Centril
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Use #[non_exhaustive] on internal enums
This replaces `__Nonexhaustive` variants (and variants thereof) with `#[non_exhaustive]`. These were mostly unstable previously, with the exception of the `cloudabi` enums and `Level` in proc_macro: these were `#[doc(hidden)]`, so clearly intended not to be used directly. It should be safe to replace all of these.
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Update the compiler test documentation to document ignore-gdb-version
and min-system-llvm-version; and expand the min-gdb-version,
min-lldb-version, and min-llvm-version documentation a little.
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remove references to AUTHORS.txt file
Rust does not ship an AUTHORS.txt file anymore.
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update books for new release
r? @Mark-Simulacrum
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Refer instead to thanks page.
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Change ManuallyDrop<T> to a lang item.
This PR implements the approach @RalfJung proposes in https://internals.rust-lang.org/t/pre-rfc-unions-drop-types-and-manuallydrop/8025 (lang item `struct` instead of `union`).
A followup PR can easily solve #47034 as well, by just adding a few `?Sized` to `libcore/mem.rs`.
r? @nikomatsakis
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Due to a change in how mdbook generates section anchors, headers
with non-alphabetic characters now start with "a".
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update miri
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This commit stabilizes some of the `proc_macro` language feature as well as a
number of APIs in the `proc_macro` crate as [previously discussed][1]. This
means that on stable Rust you can now define custom procedural macros which
operate as attributes attached to items or `macro_rules!`-like bang-style
invocations. This extends the suite of currently stable procedural macros,
custom derives, with custom attributes and custom bang macros.
Note though that despite the stabilization in this commit procedural macros are
still not usable on stable Rust. To stabilize that we'll need to stabilize at
least part of the `use_extern_macros` feature. Currently you can define a
procedural macro attribute but you can't import it to call it!
A summary of the changes made in this PR (as well as the various consequences)
is:
* The `proc_macro` language and library features are now stable.
* Other APIs not stabilized in the `proc_macro` crate are now named under a
different feature, such as `proc_macro_diagnostic` or `proc_macro_span`.
* A few checks in resolution for `proc_macro` being enabled have switched over
to `use_extern_macros` being enabled. This means that code using
`#![feature(proc_macro)]` today will likely need to move to
`#![feature(use_extern_macros)]`.
It's intended that this PR, once landed, will be followed up with an attempt to
stabilize a small slice of `use_extern_macros` just for procedural macros to
make this feature 100% usable on stable.
[1]: https://internals.rust-lang.org/t/help-stabilize-a-subset-of-macros-2-0/7252
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Closes #138
Closes #160
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* add the small amount i know about hygiene
* use en-dash
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Implementation of tool lints.
Tracking issue: #44690
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