内容简介:Rust 1.30 已发布,包含大量更新内容: Language Procedural macros are now available. These kinds of macros allow for more powerful code generation. There is a new chapter available in the Rust Progra...
Rust 1.30 已发布,包含大量更新内容:
Language
Procedural macros are now available. These kinds of macros allow for more powerful code generation. There is a new chapter available in the Rust Programming Language book that goes further in depth.
You can now use keywords as identifiers using the raw identifiers syntax (
r#
), e.g.let r#for = true;
You can now use
crate
in paths. This allows you to refer to the crate root in the path, e.g.use crate::foo;
refers tofoo
insrc/lib.rs
.Using a external crate no longer requires being prefixed with
::
. Previously, using a external crate in a module without a use statement requiredlet json = ::serde_json::from_str(foo);
but can now be written aslet json = serde_json::from_str(foo);
.You can now apply the
#[used]
attribute to static items to prevent the compiler from optimising them away, even if they appear to be unused, e.g.#[used] static FOO: u32 = 1;
You can now import and reexport macros from other crates with the
use
syntax. Macros exported with#[macro_export]
are now placed into the root module of the crate. If your macro relies on calling other local macros, it is recommended to export with the#[macro_export(local_inner_macros)]
attribute so users won't have to import those macros.You can now catch visibility keywords (e.g.
pub
,pub(crate)
) in macros using thevis
specifier.Non-macro attributes now allow all forms of literals, not just strings. Previously, you would write
#[attr("true")]
, and you can now write#[attr(true)]
.
Compiler
Libraries
Stabilized APIs
The following methods are replacement methods for
trim_left
,trim_right
,trim_left_matches
, andtrim_right_matches
, which will be deprecated in 1.33.0:
Cargo
cargo run
doesn't require specifying a package in workspaces.cargo doc
now supports--message-format=json
. This is equivalent to callingrustdoc --error-format=json
.
Misc
rustdoc
allows you to specify what edition to treat your code as with the--edition
option.We now distribute a
rust-gdbgui
script that invokesgdbgui
with Rust debug symbols.Attributes from Rust tools such as
rustfmt
orclippy
are now available, e.g.#[rustfmt::skip]
will skip formatting the next item.
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