Add post for 1.77 #1271
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Add post for 1.77 #1271
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ehuss
reviewed
Mar 10, 2024
kpreid
reviewed
Mar 10, 2024
Co-authored-by: Kevin Reid <kpreid@switchb.org>
Co-authored-by: Eric Huss <eric@huss.org>
Co-authored-by: Kevin Reid <kpreid@switchb.org>
|
I think one of the biggest changes in 1.77 is rust-lang/rust#117703. We now support recursive async functions (as long as they use indirection), making the before: use async_recursion::async_recursion;
#[async_recursion]
async fn fib(n : u32) -> u32 {
match n {
0 | 1 => 1,
_ => fib(n-1).await + fib(n-2).await
}
}
// which expands to
use std::future::Future;
use std::pin::Pin;
fn fib(n: u32) -> Pin<Box<dyn Future<Output = u32> + Send>> {
Box::pin(async move {
match n {
0 | 1 => 1,
_ => fib(n - 1).await + fib(n - 2).await,
}
})
}after async fn fib(n : u32) -> u32 {
match n {
0 | 1 => 1,
_ => Box::pin(fib(n-1)).await + Box::pin(fib(n-2)).await
}
}By avoiding trait objects this should improve the runtime performance of such functions and avoids the "auto-trait bound" problem of |
nnethercote
reviewed
Mar 12, 2024
epage
reviewed
Mar 13, 2024
This comment was marked as duplicate.
This comment was marked as duplicate.
|
Alright, I think this is now updated per all the feedback here. Thanks! |
kpreid
reviewed
Mar 16, 2024
Co-authored-by: Kevin Reid <kpreid@switchb.org>
kpreid
approved these changes
Mar 16, 2024
cuviper
reviewed
Mar 17, 2024
Co-authored-by: Josh Stone <cuviper@gmail.com>
lcnr
reviewed
Mar 18, 2024
Co-authored-by: lcnr <rust@lcnr.de>
ekanna
reviewed
Mar 21, 2024
ekanna
reviewed
Mar 21, 2024
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cc @rust-lang/release