Auto merge of #87476 - pietroalbini:stable-next, r=Mark-Simulacrum · rust-lang/rust@a178d03 (original) (raw)

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Version 1.54.0 (2021-07-29)

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Language

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• You can now use macros for values in built-in attribute macros.

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While a seemingly minor addition on its own, this enables a lot of

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powerful functionality when combined correctly. Most notably you can

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now include external documentation in your crate by writing the following.

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 ```rust

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#![doc = include_str!("README.md")]

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You can also use this to include auto-generated modules:

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 ```rust

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#[path = concat!(env!("OUT_DIR"), "/generated.rs")]

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mod generated;

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• [You can now cast between unsized slice types (and types which contain

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unsized slices) in const fn.]85078

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• [You can now use multiple generic lifetimes with impl Trait where the

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lifetimes don't explicitly outlive another.]84701 In code this means

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that you can now have impl Trait<'a, 'b> where as before you could

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only have impl Trait<'a, 'b> where 'b: 'a.

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Compiler

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• [Rustc will now search for custom JSON targets in

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/lib/rustlib/<target-triple>/target.json where / is the "sysroot"

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directory.]83800 You can find your sysroot directory by running

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rustc --print sysroot.

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• Added wasm as a target_family for WebAssembly platforms.

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• [You can now use #[target_feature] on safe functions when targeting

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WebAssembly platforms.]84988

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• Improved debugger output for enums on Windows MSVC platforms.

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• [Added tier 3* support for bpfel-unknown-none

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and bpfeb-unknown-none.]79608

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* Refer to Rust's [platform support page][platform-support-doc] for more

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information on Rust's tiered platform support.

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Libraries

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• panic::panic_any will now #[track_caller].

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• Added OutOfMemory as a variant of io::ErrorKind.

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• proc_macro::Literal now implements FromStr.

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• [The implementations of vendor intrinsics in core::arch have been

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significantly refactored.]83278 The main user-visible changes are

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a 50% reduction in the size of libcore.rlib and stricter validation

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of constant operands passed to intrinsics. The latter is technically

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a breaking change, but allows Rust to more closely match the C vendor

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intrinsics API.

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Stabilized APIs

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• BTreeMap::into_keys

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• BTreeMap::into_values

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• HashMap::into_keys

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• HashMap::into_values

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• arch::wasm32

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• VecDeque::binary_search

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• VecDeque::binary_search_by

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• VecDeque::binary_search_by_key

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• VecDeque::partition_point

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Cargo

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• [Added the --prune <spec> option to cargo-tree to remove a package from

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the dependency graph.]cargo/9520

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• [Added the --depth option to cargo-tree to print only to a certain depth

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in the tree ]cargo/9499

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• [Added the no-proc-macro value to cargo-tree --edges to hide procedural

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macro dependencies.]cargo/9488

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• A new environment variable named CARGO_TARGET_TMPDIR is available.

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This variable points to a directory that integration tests and benches

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can use as a "scratchpad" for testing filesystem operations.

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Compatibility Notes

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• Mixing Option and Result via ? is no longer permitted in closures for inferred types.

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• [Previously unsound code is no longer permitted where different constructors in branches

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could require different lifetimes.]85574

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• As previously mentioned the std::arch instrinsics now uses stricter const checking

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than before and may reject some previously accepted code.

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• [i128 multiplication on Cortex M0+ platforms currently unconditionally causes overflow

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when compiled with codegen-units = 1.]86063

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`Version 1.53.0 (2021-06-17)

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`============================

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`@@ -81,13 +205,6 @@ Stabilised APIs

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`` - [Vec::extend_from_within]

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`` - [array::from_mut]

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• char::MAX

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• char::REPLACEMENT_CHARACTER

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• char::UNICODE_VERSION

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• char::decode_utf16

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• char::from_digit

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• char::from_u32_unchecked

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• char::from_u32

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`` - [cmp::max_by_key]

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`` - [cmp::max_by]

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`` - [cmp::min_by_key]

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`` In particular, this was known to be a problem in the lexical-core crate,

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` but they have published fixes for semantic versions 0.4 through 0.7. To

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`` update this dependency alone, use cargo update -p lexical-core.

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• Incremental compilation remains off by default, unless one uses the RUSTC_FORCE_INCREMENTAL=1 environment variable added in 1.52.1.

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`Internal Only

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`-------------

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`@@ -156,13 +274,6 @@ related tools.

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`[cargo/9298]: https://github.com/rust-lang/cargo/pull/9298

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`[cargo/9282]: https://github.com/rust-lang/cargo/pull/9282

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`[cargo/9392]: https://github.com/rust-lang/cargo/pull/9392

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`` [AtomicBool::fetch_update]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update

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`` [AtomicPtr::fetch_update]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update

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`` [BTreeMap::retain]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain

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`` - [Rustc now catches more cases of pub_use_of_private_extern_crate][80763]

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`- [Changes in how proc macros handle whitespace may lead to panics when used

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`` with older proc-macro-hack versions. A cargo update should be sufficient to fix this in all cases.][84136]

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• Turn #[derive] into a regular macro attribute

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`[84136]: https://github.com/rust-lang/rust/issues/84136

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`[80763]: https://github.com/rust-lang/rust/pull/80763

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`[78429]: https://github.com/rust-lang/rust/pull/78429

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`[82733]: https://github.com/rust-lang/rust/pull/82733

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`[82594]: https://github.com/rust-lang/rust/pull/82594

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`[cargo/9181]: https://github.com/rust-lang/cargo/pull/9181

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`` char::MAX: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX

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`` char::REPLACEMENT_CHARACTER: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER

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`` - [You can now use #[repr(transparent)] on univariant enums.][68122] Meaning

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` that you can create an enum that has the exact layout and ABI of the type

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• You can now use outer attribute procedural macros on inline modules.

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`- [There are some syntax-only changes:][67131]

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`` - default is syntactically allowed before items in trait definitions.

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`[67935]: https://github.com/rust-lang/rust/pull/67935/

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`[68339]: https://github.com/rust-lang/rust/pull/68339/

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`[68122]: https://github.com/rust-lang/rust/pull/68122/

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`[67712]: https://github.com/rust-lang/rust/pull/67712/

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`[67887]: https://github.com/rust-lang/rust/pull/67887/

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`[67131]: https://github.com/rust-lang/rust/pull/67131/

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