1.47.0 #
- Released on: 8 October, 2020
- Branched from master on: 21 August, 2020
Language #
Compiler #
- Stabilized the
-C control-flow-guard
codegen option, which enables Control Flow Guard for Windows platforms, and is ignored on other platforms. - Upgraded to LLVM 11.
- Added tier 3* support for the
thumbv4t-none-eabi
target. - Upgrade the FreeBSD toolchain to version 11.4
RUST_BACKTRACE
’s output is now more compact.
* Refer to Rust’s [platform support page][platform-support-doc] for more information on Rust’s tiered platform support.
Libraries #
CStr
now implementsIndex<RangeFrom<usize>>
.- Traits in
std
/core
are now implemented for arrays of any length, not just those of length less than 33. ops::RangeFull
andops::Range
now implement Default.panic::Location
now implementsCopy
,Clone
,Eq
,Hash
,Ord
,PartialEq
, andPartialOrd
.
Stabilized APIs #
Ident::new_raw
Range::is_empty
RangeInclusive::is_empty
Result::as_deref
Result::as_deref_mut
Vec::leak
pointer::offset_from
f32::TAU
f64::TAU
The following previously stable APIs have now been made const.
- The
new
method for allNonZero
integers. - The
checked_add
,checked_sub
,checked_mul
,checked_neg
,checked_shl
,checked_shr
,saturating_add
,saturating_sub
, andsaturating_mul
methods for all integers. - The
checked_abs
,saturating_abs
,saturating_neg
, andsignum
for all signed integers. - The
is_ascii_alphabetic
,is_ascii_uppercase
,is_ascii_lowercase
,is_ascii_alphanumeric
,is_ascii_digit
,is_ascii_hexdigit
,is_ascii_punctuation
,is_ascii_graphic
,is_ascii_whitespace
, andis_ascii_control
methods forchar
andu8
.
Cargo #
build-dependencies
are now built with opt-level 0 by default. You can override this by setting the following in yourCargo.toml
.[profile.release.build-override] opt-level = 3
cargo-help
will now display man pages for commands rather just the--help
text.cargo-metadata
now emits atest
field indicating if a target has tests enabled.workspace.default-members
now respectsworkspace.exclude
.cargo-publish
will now use an alternative registry by default if it’s the only registry specified inpackage.publish
.
Misc #
- Added a help button beside Rustdoc’s searchbar that explains rustdoc’s type based search.
- Added the Ayu theme to rustdoc.
Compatibility Notes #
- Bumped the minimum supported Emscripten version to 1.39.20.
- Fixed a regression parsing
{} && false
in tail expressions. - Added changes to how proc-macros are expanded in
macro_rules!
that should help to preserve more span information. These changes may cause compilation errors if your macro was unhygenic or didn’t correctly handleDelimiter::None
. - Moved support for the CloudABI target to tier 3.
linux-gnu
targets now require minimum kernel 2.6.32 and glibc 2.11.- Added the
rustc-docs
component. This allows you to install and read the documentation for the compiler internal APIs. (Currently only available forx86_64-unknown-linux-gnu
.)
Internal Only #
- Improved default settings for bootstrapping in
x.py
. You can read details about this change in the “Changes tox.py
defaults” post on the Inside Rust blog.