Rust 1.13.0

Language

--------

* [Stabilize the ? operator][36995]. ? is a simple way to propagate

errors, like the try! macro, described in [RFC 0243].

* [Stabilize macros in type position][36014]. Described in [RFC 873].

* [Stabilize attributes on statements][36995]. Described in [RFC 0016].

* [Fix #[derive] for empty tuple structs/variants][35728]

* [Fix lifetime rules for 'if' conditions][36029]

* [Avoid loading and parsing unconfigured non-inline modules][36482]

Compiler

--------

* [Add the -C link-arg argument][36574]

* [Remove the old AST-based backend from rustc_trans][35764]

* [Don't enable NEON by default on armv7 Linux][35814]

* [Fix debug line number info for macro expansions][35238]

* [Do not emit "class method" debuginfo for types that are not

DICompositeType][36008]

* [Warn about multiple conflicting #[repr] hints][34623]

* [When sizing DST, don't double-count nested struct prefixes][36351]

* [Default RUST_MIN_STACK to 16MiB for now][36505]

* [Improve rlib metadata format][36551]. Reduces rlib size significantly.

* [Reject macros with empty repetitions to avoid infinite loop][36721]

* [Expand macros without recursing to avoid stack overflows][36214]

Diagnostics

-----------

* [Replace macro backtraces with labeled local uses][35702]

* [Improve error message for misplaced doc comments][33922]

* [Buffer unix and lock windows to prevent message interleaving][35975]

* [Update lifetime errors to specifically note temporaries][36171]

* [Special case a few colors for Windows][36178]

* [Suggest use self when such an import resolves][36289]

* [Be more specific when type parameter shadows primitive type][36338]

* Many minor improvements

Compile-time Optimizations

--------------------------

* [Compute and cache HIR hashes at beginning][35854]

* [Don't hash types in loan paths][36004]

* [Cache projections in trans][35761]

* [Optimize the parser's last token handling][36527]

* [Only instantiate #[inline] functions in codegen units referencing

them][36524]. This leads to big improvements in cases where crates export

define many inline functions without using them directly.

* [Lazily allocate TypedArena's first chunk][36592]

* [Don't allocate during default HashSet creation][36734]

Stabilized APIs

---------------

* [checked_abs]

* [wrapping_abs]

* [overflowing_abs]

* [RefCell::try_borrow]

* [RefCell::try_borrow_mut]

Libraries

---------

* [Add assert_ne! and debug_assert_ne!][35074]

* [Make vec_deque::Drain, hash_map::Drain, and hash_set::Drain

covariant][35354]

* [Implement AsRef<[T]> for std::slice::Iter][35559]

* [Implement Debug for std::vec::IntoIter][35707]

* [CString: avoid excessive growth just to 0-terminate][35871]

* [Implement CoerceUnsized for {Cell, RefCell, UnsafeCell}][35627]

* [Use arc4rand on FreeBSD][35884]

* [memrchr: Correct aligned offset computation][35969]

* [Improve Demangling of Rust Symbols][36059]

* [Use monotonic time in condition variables][35048]

* [Implement Debug for std::path::{Components,Iter}][36101]

* [Implement conversion traits for char][35755]

* [Fix illegal instruction caused by overflow in channel cloning][36104]

* [Zero first byte of CString on drop][36264]

* [Inherit overflow checks for sum and product][36372]

* [Add missing Eq implementations][36423]

* [Implement Debug for DirEntry][36631]

* [When getaddrinfo returns EAI_SYSTEM retrieve actual error from

errno][36754]

* [SipHasher] is deprecated. Use [DefaultHasher].

* [Implement more traits for std::io::ErrorKind][35911]

* [Optimize BinaryHeap bounds checking][36072]

* [Work around pointer aliasing issue in Vec::extend_from_slice,

extend_with_element][36355]

* [Fix overflow checking in unsigned pow()][34942]

Cargo

-----

* This release includes security fixes to both curl and OpenSSL.

* [Fix transitive doctests when panic=abort][cargo/3021]

* [Add --all-features flag to cargo][cargo/3038]

* [Reject path-based dependencies in cargo package][cargo/3060]

* [Don't parse the home directory more than once][cargo/3078]

* [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]

* [Update OpenSSL to 1.0.2j][cargo/3121]

* [Add license and license_file to cargo metadata output][cargo/3110]

* [Make crates-io registry URL optional in config; ignore all changes to

source.crates-io][cargo/3089]

* [Don't download dependencies from other platforms][cargo/3123]

* [Build transitive dev-dependencies when needed][cargo/3125]

* [Add support for per-target rustflags in .cargo/config][cargo/3157]

* [Avoid updating registry when adding existing deps][cargo/3144]

* [Warn about path overrides that won't work][cargo/3136]

* [Use workspaces during cargo install][cargo/3146]

* [Leak mspdbsrv.exe processes on Windows][cargo/3162]

* [Add --message-format flag][cargo/3000]

* [Pass target environment for rustdoc][cargo/3205]

* [Use CommandExt::exec for cargo run on Unix][cargo/2818]

* [Update curl and curl-sys][cargo/3241]

* [Call rustdoc test with the correct cfg flags of a package][cargo/3242]

Tooling

-------

* [rustdoc: Add the --sysroot argument][36586]

* [rustdoc: Fix a couple of issues with the search results][35655]

* [rustdoc: remove the ! from macro URLs and titles][35234]

* [gdb: Fix pretty-printing special-cased Rust types][35585]

* [rustdoc: Filter more incorrect methods inherited through Deref][36266]

Misc

----

* [Remove unmaintained style guide][35124]

* [Add s390x support][36369]

* [Initial work at Haiku OS support][36727]

* [Add mips-uclibc targets][35734]

* [Crate-ify compiler-rt into compiler-builtins][35021]

* [Add rustc version info (git hash + date) to dist tarball][36213]

* Many documentation improvements

Compatibility Notes

-------------------

* [SipHasher] is deprecated. Use [DefaultHasher].

* [Deny (by default) transmuting from fn item types to pointer-sized

types][34923]. Continuing the long transition to zero-sized fn items,

per [RFC 401].

* [Fix #[derive] for empty tuple structs/variants][35728].

Part of [RFC 1506].

* [Issue deprecation warnings for safe accesses to extern statics][36173]

* [Fix lifetime rules for 'if' conditions][36029].

* [Inherit overflow checks for sum and product][36372].

* [Forbid user-defined macros named "macro_rules"][36730].

[33922]: https://github.com/rust-lang/rust/pull/33922

[34623]: https://github.com/rust-lang/rust/pull/34623

[34923]: https://github.com/rust-lang/rust/pull/34923

[34942]: https://github.com/rust-lang/rust/pull/34942

[35021]: https://github.com/rust-lang/rust/pull/35021

[35048]: https://github.com/rust-lang/rust/pull/35048

[35074]: https://github.com/rust-lang/rust/pull/35074

[35124]: https://github.com/rust-lang/rust/pull/35124

[35234]: https://github.com/rust-lang/rust/pull/35234

[35238]: https://github.com/rust-lang/rust/pull/35238

[35354]: https://github.com/rust-lang/rust/pull/35354

[35559]: https://github.com/rust-lang/rust/pull/35559

[35585]: https://github.com/rust-lang/rust/pull/35585

[35627]: https://github.com/rust-lang/rust/pull/35627

[35655]: https://github.com/rust-lang/rust/pull/35655

[35702]: https://github.com/rust-lang/rust/pull/35702

[35707]: https://github.com/rust-lang/rust/pull/35707

[35728]: https://github.com/rust-lang/rust/pull/35728

[35734]: https://github.com/rust-lang/rust/pull/35734

[35755]: https://github.com/rust-lang/rust/pull/35755

[35761]: https://github.com/rust-lang/rust/pull/35761

[35764]: https://github.com/rust-lang/rust/pull/35764

[35814]: https://github.com/rust-lang/rust/pull/35814

[35854]: https://github.com/rust-lang/rust/pull/35854

[35871]: https://github.com/rust-lang/rust/pull/35871

[35884]: https://github.com/rust-lang/rust/pull/35884

[35911]: https://github.com/rust-lang/rust/pull/35911

[35969]: https://github.com/rust-lang/rust/pull/35969

[35975]: https://github.com/rust-lang/rust/pull/35975

[36004]: https://github.com/rust-lang/rust/pull/36004

[36008]: https://github.com/rust-lang/rust/pull/36008

[36014]: https://github.com/rust-lang/rust/pull/36014

[36029]: https://github.com/rust-lang/rust/pull/36029

[36059]: https://github.com/rust-lang/rust/pull/36059

[36072]: https://github.com/rust-lang/rust/pull/36072

[36101]: https://github.com/rust-lang/rust/pull/36101

[36104]: https://github.com/rust-lang/rust/pull/36104

[36171]: https://github.com/rust-lang/rust/pull/36171

[36173]: https://github.com/rust-lang/rust/pull/36173

[36178]: https://github.com/rust-lang/rust/pull/36178

[36213]: https://github.com/rust-lang/rust/pull/36213

[36214]: https://github.com/rust-lang/rust/pull/36214

[36264]: https://github.com/rust-lang/rust/pull/36264

[36266]: https://github.com/rust-lang/rust/pull/36266

[36289]: https://github.com/rust-lang/rust/pull/36289

[36338]: https://github.com/rust-lang/rust/pull/36338

[36351]: https://github.com/rust-lang/rust/pull/36351

[36355]: https://github.com/rust-lang/rust/pull/36355

[36369]: https://github.com/rust-lang/rust/pull/36369

[36372]: https://github.com/rust-lang/rust/pull/36372

[36423]: https://github.com/rust-lang/rust/pull/36423

[36482]: https://github.com/rust-lang/rust/pull/36482

[36505]: https://github.com/rust-lang/rust/pull/36505

[36524]: https://github.com/rust-lang/rust/pull/36524

[36527]: https://github.com/rust-lang/rust/pull/36527

[36551]: https://github.com/rust-lang/rust/pull/36551

[36574]: https://github.com/rust-lang/rust/pull/36574

[36586]: https://github.com/rust-lang/rust/pull/36586

[36592]: https://github.com/rust-lang/rust/pull/36592

[36631]: https://github.com/rust-lang/rust/pull/36631

[36721]: https://github.com/rust-lang/rust/pull/36721

[36727]: https://github.com/rust-lang/rust/pull/36727

[36730]: https://github.com/rust-lang/rust/pull/36730

[36734]: https://github.com/rust-lang/rust/pull/36734

[36754]: https://github.com/rust-lang/rust/pull/36754

[36995]: https://github.com/rust-lang/rust/pull/36995

[RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md

[RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md

[RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md

[RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md

[RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md

[cargo/2818]: https://github.com/rust-lang/cargo/pull/2818

[cargo/3000]: https://github.com/rust-lang/cargo/pull/3000

[cargo/3021]: https://github.com/rust-lang/cargo/pull/3021

[cargo/3038]: https://github.com/rust-lang/cargo/pull/3038

[cargo/3060]: https://github.com/rust-lang/cargo/pull/3060

[cargo/3078]: https://github.com/rust-lang/cargo/pull/3078

[cargo/3089]: https://github.com/rust-lang/cargo/pull/3089

[cargo/3092]: https://github.com/rust-lang/cargo/pull/3092

[cargo/3110]: https://github.com/rust-lang/cargo/pull/3110

[cargo/3121]: https://github.com/rust-lang/cargo/pull/3121

[cargo/3123]: https://github.com/rust-lang/cargo/pull/3123

[cargo/3125]: https://github.com/rust-lang/cargo/pull/3125

[cargo/3136]: https://github.com/rust-lang/cargo/pull/3136

[cargo/3144]: https://github.com/rust-lang/cargo/pull/3144

[cargo/3146]: https://github.com/rust-lang/cargo/pull/3146

[cargo/3157]: https://github.com/rust-lang/cargo/pull/3157

[cargo/3162]: https://github.com/rust-lang/cargo/pull/3162

[cargo/3205]: https://github.com/rust-lang/cargo/pull/3205

[cargo/3241]: https://github.com/rust-lang/cargo/pull/3241

[cargo/3242]: https://github.com/rust-lang/cargo/pull/3242

[checked_abs]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs

[wrapping_abs]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs

[overflowing_abs]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs

[RefCell::try_borrow]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow

[RefCell::try_borrow_mut]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut

[SipHasher]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html

[DefaultHasher]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html