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...pointer is directly expected, but also when different function item types with the same signature meet in different arms of the same if or match:
# let want_i32 = false;
# fn foo<T>() { }
// `foo_ptr_1` has function pointer type `fn()` here
let foo_ptr_1: fn() = foo::<i32>;
// ... and so...
...snip ..
}
}
Again, the matching code from dav1d doesn’t initialize this buffer.
Here, switching to MaybeUninit is more difficult, but we can still offer a modest improvement: we’ll only need to do the initialization once if we hoist lr_bak to the top level!pub(crate) fn rav1d_cdef...
...Using Result for Error Handling
use std::fs::File;
use std::io::ErrorKind;
fn main() {
let greeting_file_result = File::open("hello.txt");
let greeting_file = match greeting_file_result {
Ok(file) => file,
Err(error) => match error.kind() {
ErrorKind::NotFound => match File::create("hello.txt") {
Ok(fc) => fc,
Err(e...
...Pair<'_, Rule>) -> Block {
rule.into_inner()
.map(|statement| match statement.as_rule() {
Rule::letStatement => parse_statement_let(statement),
Rule::assignmentStatement => parse_statement_assignment(statement),
Rule::returnStatement => parse_statement_return(statement),
Rule::block => BlockElement::NestedBlock(parse_block(statement)),
_ => unreachable!(),
})
.collect()
}
As you can see, it maps pretty closely the grammar’s...
...changelog
Atom IDE v0.11 - tag
RFCs
2285 - Update the disambiguation handling in RFC 1946 (intra-rustdoc-links) to match impl concerns - FCP merge
2287 - Benchmarking / cargo bench - FCP close - superseded by 2318
2318 - Post Build Contexts (custom test frameworks)
Meetings
Find all meeting notes here, some highlights:
Cargo build...
...macro_rules macros in Rust and syntax-rules macros in Scheme allow for pattern matching of arguments in the macro definition, so different code is substituted for the macro use depending on the arguments.
Depending on how macros are defined will affect how and when macros are lexed and parsed...
...When I benchmark my change against SpiderMonkey, I don’t see any
significant performance improvement from matching the arity.
Next, mraleph noticed that the generic sorting routine was not being
monomorphized, and the comparator functions passed to it were not being inlined.
To mold the JavaScript code into something that...
...At Nymi, everyone has a passion for making the future better than today and the courage to blaze that path. Our Culture is Recognized for Enabling Employees to Do Their Best WorkHybrid work options to match your styleWe've got a dynamic, open-concept office in the heart of Toronto...
...In this event we will finish Rust’s Patterns and Matching!
Rust is a language empowering everyone to build reliable and efficient software.
Let’s meet for open hacking and (co)-learning in our bi-weekly learning group!
Everyone is welcome. Rusties of all skill levels meet and hack on...
...i32 = 3.pow(3);
match x {
CUBE => println!("three cubed"),
_ => {}
}
}
```
If that `const` is only used inside a single pattern, writing the code using an
inline `const` block makes it easier to scan.
```rust
fn foo(x: i32) {
match x {
const { 3.pow(3) } => println!("three cubed"),
_ => {}
}
}
```
## Reference-level explanation...
...We believe we can justify this regression though, because with the unsafe-performance-experimental feature flag enabled we match C performance. This feature flag disables 4 bounds checks where data from the input is used to index into a data structure. For most users a ~3% performance regression is likely...
...We can then configure pin P0_12 as a pullup with sense input like so:let p0_register_block = nrf52840_hal::pac::P0::ptr();
unsafe { &(*p0_register_block).pin_cnf[12] }.write(|w| {
w.dir().input();
w.input().connect();
w.pull().pullup();
w.drive().s0s1();
match sense_when_goes_to...
...A better way to convert the enum variants to the correct values is an explicit match:
impl From<PacketType> for u8 {
fn from(original: PacketType) -> u8 {
match original {
PacketType::Data => 0,
PacketType::Fin => 1,
PacketType::State => 2,
PacketType::Reset => 3,
PacketType::Syn => 4,
}
}
}
Pretty straightforward, right? Since the mapping from...
...Some pattern include dots to indicate that the
pattern should only match at the start or end of the word.
Now, to find out how to hyphenate a word, we first need a
zero-initialized array of levels with length one less than that of the
word (one entry for...
...fasterthanlime's "A Rust match made in hell" explores a similar problem related to how match expression scrutinees can extend temporary lifetimes, and how that conflicts with locks.
The section discussing current rules in Niko Matsaki's similarly titled "Temporary Lifetimes"
I'm looking for Summer 2025 internships. Feel free...
...The polling code can then match the returned enum and perform the branching.
Shared mutable borrows#
We also let async blocks share mutable borrows as long as they don't cross any await yieldpoint. This is done by parsing through all the blocks to find shared borrows, and putting all...
...At Nymi, everyone has a passion for making the future better than today and the courage to blaze that path. Our Culture is Recognized for Enabling Employees to Do Their Best WorkHybrid work options to match your styleWe've got a dynamic, open-concept office in the heart of Toronto...
...This also matches the best default for what we believe will be the primary use
case for alternative registries: internal registries for private organizations.
Rather than requiring each new project to redeclare its dependency on that
registry, each machine can be preconfigured to be able to locate the registry.
Pulling...
...range accumulation and triangulation tasks.GStreamer image payloads can now replay from recorded bytes without a live GStreamer pipeline.ROS2 bridge payload encoding now matches ROS2 CDR little-endian expectations and has end-to-end coverage.As usual, we cannot wait to see what you will create with copper-rs!
...We fly somewhere new once a quarter so that everyone can meet up in person.Excellent healthcare, vision, and dental with all premiums covered.Our 401(k) plan matches your contributions (without any vesting period) up to the employee federal maximum of $19,500.We're stable, well-funded, and...
"It's a great example of the different attitudes of C/C++ and Rust: In C/C++ something is correct when someone can use it correctly, but in Rust someth..."