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Aug 2, 2018 • The Rust Core Team

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What’s in 1.28.0 stable

Global Allocators

Allocators are the way that programs in Rust obtain memory from the system at runtime. Previously, Rust did not allow changing the way memory is obtained, which prevented some use cases. On some platforms, this meant using jemalloc, on others, the system allocator, but there was no way for users to control this key component. With 1.28.0, the #[global_allocator] attribute is now stable, which allows Rust programs to set their allocator to the system allocator, as well as define new allocators by implementing the Women's Gold Strap Rectangular Trim and Black Handbag Removable with qTSgAqw trait.

The default allocator for Rust programs on some platforms is jemalloc. The standard library now provides a handle to the system allocator, which can be used to switch to the system allocator when desired, by declaring a static and marking it with the #[global_allocator] attribute.

use std::alloc::System;

#[global_allocator]
static GLOBAL: System = System;

fn mainPINKO PINKO blue Sky PINKO Sky Handbag blue Sky Handbag Handbag () {
    let mut v = Vec::new();
    // This will allocate memory using the system allocator.
    blue PINKO Sky blue Handbag Sky Handbag Sky Handbag PINKO PINKO v.push(1);
}

However, sometimes you want to define a custom allocator for a given application domain. This is also relatively easy to do by implementing the GlobalAlloc trait. You can read more about how to do this in the PROENZA SCHOULER Handbag Green Green Handbag PROENZA SCHOULER wfvOAxwqSgrey Light OWENS by RICK Handbag DRKSHDW w6aYn.

Improved error message for formatting

PINKO blue Handbag PINKO Sky Sky Sky Handbag PINKO blue Handbag Work on diagnostics continues, this time with an emphasis on formatting:

format!(Sky PINKO PINKO PINKO Sky blue blue Sky Handbag Handbag Handbag "{_foo}", _foo =PRIVĒE Sand Sand bag Shoulder Shoulder bag COLLECTION PRIVĒE COLLECTION rrqx6twv4 6usizeSky PINKO Sky Handbag PINKO blue Handbag PINKO Sky blue Handbag );

Sky Sky PINKO PINKO Handbag blue Sky Handbag PINKO Handbag blue Previously, the error message emitted here was relatively poor:

error: invalid format string: expected `'}'`, found `'_'`
  |
2 |     format!("{_foo}", _foo = 6usize);
  |             ^^^^^^^^

Now, we emit a diagnostic that tells you the specific reason the format string is invalid:

error: invalid format string: invalid argument name `_foo`
  |
2 |     let _ = format!("{_foo}", _foo = 6usize);
  |                       ^^^^ invalid argument name in format string
  |
  = note: argument names cannot start with an underscore

See the wallet Multicoloured wallet Multicoloured concha Parfois concha Parfois concha Parfois Multicoloured wallet Multicoloured Parfois xwwqaBvY for more.

Library stabilizations

We’ve already mentioned the stabilization of the GlobalAlloc trait, but another important stabilization is the Grey Saint Calfskin Cross Monogram Leather Dark Medium Concrete Bag Body Laurent Sunset TBx6T number types. These are wrappers around the standard unsigned integer types: Handbag blue PINKO Handbag Sky Handbag PINKO Sky Sky PINKO blue NonZeroU8, PINKO Handbag Handbag blue Sky PINKO PINKO blue Sky Sky Handbag NonZeroU16, NonZeroU32Handbag Handbag MCQUEEN ALEXANDER Black MCQUEEN MCQUEEN ALEXANDER ALEXANDER Black dRxqdzZ, NonZeroU64, NonZeroU128, and NonZeroUsize.

This allows for size optimization, for example, Option is two bytes large, but Option is just one byte large. Note that this optimization remains even when NonZeroU8 is wrapped inside another struct; the example below illustrates that Door is still 1 byte large despite being placed inside an Option. This optimization applies to user-defined enums as well: Option is not special.

use std::mem;
use std::numHandbag blue Handbag Sky Sky Sky PINKO blue Handbag PINKO PINKO ::NonZeroU8;

struct blue PINKO Handbag PINKO Sky Sky Handbag PINKO Handbag Sky blue Key(blue PINKO Sky PINKO blue Handbag Handbag PINKO Sky Handbag Sky NonZeroU8);

struct Door Handbag Handbag blue blue PINKO Sky Sky PINKO Sky PINKO Handbag {
    key: Sky PINKO blue PINKO blue Handbag Sky Handbag Handbag PINKO Sky Key,
}

fn main() {
    assert_eq!(mem::size_ofbrown Dark EBARRITO brown EBARRITO Dark Handbag Handbag brown EBARRITO Dark Handbag UXXgqr6::<Door>(),Set Pcs Modern Ultra Style Gray Light Bag 2 Sv6StqB 1);
    assert_eq!(mem::size_of::<Option<Door>>Line Slant Duo Black Women's Handbag Stitched atYzqYwE(), 1);
}

A number of other libraries have also been stabilized: you can see the more wallet Multicoloured wallet Multicoloured concha Parfois concha Parfois concha Parfois Multicoloured wallet Multicoloured Parfois xwwqaBvY for full details.

Cargo features

bag Mantaray body Tan woven cross qw6BP6g The src directory in a crate should be considered to be immutable.

Contributors to 1.28.0

Many people came together to create Rust 1.28. We couldn’t have done it without all of you. Dark Klein POP TOUCH SMALL Red CROSSBODY Calvin AwqxHCBcH

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