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rust-lang/rust
ICE with "failed to resolve instance for <... as IntoFuture>::into_future: Ok(None)" (regression between 1.73 and 1.74)

!-- Thank you for finding an Internal Compiler Error! 🧊 If possible, try to provide a minimal verifiable example. You can read Rust Bug Minimization Patterns for how to create smaller examples. http://blog.pnkfx.org/blog/2019/11/18/rust-bug-minimization-patterns/ ...
A-async-await
A-auto-traits
AsyncAwait-Triaged
C-bug
I-ICE
P-medium
regression-from-stable-to-stable
S-bug-has-test
S-has-mcve
T-compiler
WG-async
  • 42triangles
  • 10
  • Opened 
    on Dec 18, 2023
  • #119095

rust-lang/rust
Slow compilation of async fn that creates a vector with many Strings created from string literals, even with no .await

fn main() { make_menagerie(); } async fn make_menagerie() - Vec String { vec![ monster .to_string(), // === repeat this line 1000 to 10000 times. ] } Build with cargo build. I ...
A-async-await
AsyncAwait-Triaged
C-optimization
I-compilemem
I-compiletime
P-medium
T-compiler
WG-async
  • shepmaster
  • 6
  • Opened 
    on Aug 28, 2023
  • #115327

rust-lang/rust
Unclear error when trying to write high-order function accepting an `async` function that itself takes a reference

!-- Thank you for filing a bug report! 🐛 Please provide a short summary of the bug, along with any information you feel relevant to replicating the bug. I tried this code: use std::future::Future; struct ...
A-async-await
A-diagnostics
A-lifetimes
A-type-system
AsyncAwait-Triaged
C-bug
D-confusing
D-terse
P-medium
T-types
  • pvillela
  • 6
  • Opened 
    on Jul 9, 2023
  • #113495

rust-lang/rust
ICE: "forcing query with already existing `DepNode`" with many async calls

!-- Thank you for finding an Internal Compiler Error! 🧊 If possible, try to provide a minimal verifiable example. You can read Rust Bug Minimization Patterns for how to create smaller examples. http://blog.pnkfx.org/blog/2019/11/18/rust-bug-minimization-patterns/ ...
A-async-await
A-query-system
AsyncAwait-Triaged
C-bug
I-ICE
P-medium
S-needs-repro
T-compiler
  • GunnarMorrigan
  • 1
  • Opened 
    on Jun 9, 2023
  • #112456

rust-lang/rust
Spurious "implementation of `FnOnce` is not general enough" error

Hello rustaceans, I ll start with the brief overview and provide repro instructions at the end: Given the following code: pub async fn spawn_execute_process(self: Arc Self ) - JoinHandle () { ...
A-async-await
A-diagnostics
AsyncAwait-Triaged
P-medium
S-bug-has-test
T-compiler
T-types
  • mystenmark
  • 18
  • Opened 
    on Jul 20, 2022
  • #99492

rust-lang/rust
Nested async closures result in exponential compilation time increase

I ve noticed exponential increases in compilation times as I nest async closures within each other. I tried this code: macro_rules! compose_middleware_inner { ( $route:ident, $first:ident, $second:ident, ...
A-async-await
A-closures
AsyncAwait-Triaged
C-bug
I-compiletime
P-medium
T-compiler
  • blazzy
  • 6
  • Opened 
    on Mar 11, 2021
  • #83031

rust-lang/rust
Make Option<T> `#[must_use]` if T is

I was recently refactoring some code that originally looked like this (minimized): fn foo() {} async fn bar() { Some(foo()); } bar() was far away from the definition of foo(). I had need to refactor ...
A-async-await
AsyncAwait-Triaged
P-medium
T-lang
  • ctiller
  • 12
  • Opened 
    on Apr 20, 2020
  • #71368

rust-lang/rust
perf slowdown from #70831 (remove a stack frame from .await calls)

Post-merge [perf results](https://perf.rust-lang.org/compare.html?start=534a41a32952d36ec73656357777ebbea707aeb4 end=4e4d49d60fd696c4036d438292673a2d7fd34519 stat=instructions:u) are 100% restricted to ...
A-async-await
AsyncAwait-Triaged
C-optimization
I-compiletime
P-medium
T-compiler
  • nikomatsakis
  • 6
  • Opened 
    on Apr 17, 2020
  • #71244

rust-lang/rust
no_mangle causes compilation errors with async-await on armv7-linux-androideabi and aarch64-linux-android targets

!-- Thank you for filing a bug report! 🐛 Please provide a short summary of the bug, along with any information you feel relevant to replicating the bug. Adding the no_mangle attribute to a function which ...
A-async-await
A-LLVM
AsyncAwait-Triaged
C-bug
I-crash
O-android
P-medium
regression-from-stable-to-stable
T-compiler
  • jeswin
  • 17
  • Opened 
    on Mar 18, 2020
  • #70098

rust-lang/rust
It is hard to see the return types of async functions

In the documentation it is hard to distinguish async functions from normal functions. Take for example warp::Server. Both run and bind returns futures. But when I was reading the docs I thought only bind ...
A-async-await
AsyncAwait-Triaged
C-enhancement
E-medium
P-medium
T-rustdoc
  • NickeZ
  • 15
  • Opened 
    on Mar 6, 2020
  • #69781
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