Tasks that are using &'static args broke

[Ddystopia]

Error:

cargo  check
    Checking embassy_executor_min v0.1.0 (/home/ddystopia/code/embassy_executor_min)
error: concrete type differs from previous defining opaque type use
 --> src/main.rs:7:1
  |
7 | #[embassy_executor::task]
  | ^^^^^^^^^^^^^^^^^^^^^^^^^ expected `Fut`, got `impl Future<Output = ()>`
  |
note: previous use here
 --> src/main.rs:7:1
  |
7 | #[embassy_executor::task]
  | ^^^^^^^^^^^^^^^^^^^^^^^^^
  = note: this error originates in the attribute macro `embassy_executor::task` (in Nightly builds, run with -Z macro-backtrace for more info)

error: could not compile `embassy_executor_min` (bin "embassy_executor_min") due to 1 previous error

Rust:

rustc 1.79.0-nightly (2f090c30d 2024-03-23)
binary: rustc
commit-hash: 2f090c30ddd6b3bbe5c81c087579a5166e7c7278
commit-date: 2024-03-23
host: x86_64-unknown-linux-gnu
release: 1.79.0-nightly
LLVM version: 18.1.2

#![feature(type_alias_impl_trait)]

fn main() {
    println!("Hello, world!");
}

#[embassy_executor::task]
async fn my_task(_a: &'static i32) {}

Carto.toml

[package]
name = "embassy_executor_min"
version = "0.1.0"
edition = "2021"

[dependencies]
embassy-executor = { version = "0.5.0", features=["nightly"], default-features = false }

Cargo.lock

```toml # This file is automatically @generated by Cargo. # It is not intended for manual editing. version = 3

[[package]]
name = "critical-section"
version = "1.1.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "7059fff8937831a9ae6f0fe4d658ffabf58f2ca96aa9dec1c889f936f705f216"

[[package]]
name = "darling"
version = "0.20.8"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "54e36fcd13ed84ffdfda6f5be89b31287cbb80c439841fe69e04841435464391"
dependencies = [
"darling_core",
"darling_macro",
]

[[package]]
name = "darling_core"
version = "0.20.8"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "9c2cf1c23a687a1feeb728783b993c4e1ad83d99f351801977dd809b48d0a70f"
dependencies = [
"fnv",
"ident_case",
"proc-macro2",
"quote",
"strsim",
"syn",
]

[[package]]
name = "darling_macro"
version = "0.20.8"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "a668eda54683121533a393014d8692171709ff57a7d61f187b6e782719f8933f"
dependencies = [
"darling_core",
"quote",
"syn",
]

[[package]]
name = "document-features"
version = "0.2.8"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ef5282ad69563b5fc40319526ba27e0e7363d552a896f0297d54f767717f9b95"
dependencies = [
"litrs",
]

[[package]]
name = "embassy-executor"
version = "0.5.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ec648daedd2143466eff4b3e8002024f9f6c1de4ab7666bb679688752624c925"
dependencies = [
"critical-section",
"document-features",
"embassy-executor-macros",
]

[[package]]
name = "embassy-executor-macros"
version = "0.4.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ad454accf80050e9cf7a51e994132ba0e56286b31f9317b68703897c328c59b5"
dependencies = [
"darling",
"proc-macro2",
"quote",
"syn",
]

[[package]]
name = "embassy_executor_min"
version = "0.1.0"
dependencies = [
"embassy-executor",
]

[[package]]
name = "fnv"
version = "1.0.7"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"

[[package]]
name = "ident_case"
version = "1.0.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "b9e0384b61958566e926dc50660321d12159025e767c18e043daf26b70104c39"

[[package]]
name = "litrs"
version = "0.4.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "b4ce301924b7887e9d637144fdade93f9dfff9b60981d4ac161db09720d39aa5"

[[package]]
name = "proc-macro2"
version = "1.0.79"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "e835ff2298f5721608eb1a980ecaee1aef2c132bf95ecc026a11b7bf3c01c02e"
dependencies = [
"unicode-ident",
]

[[package]]
name = "quote"
version = "1.0.35"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "291ec9ab5efd934aaf503a6466c5d5251535d108ee747472c3977cc5acc868ef"
dependencies = [
"proc-macro2",
]

[[package]]
name = "strsim"
version = "0.10.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "73473c0e59e6d5812c5dfe2a064a6444949f089e20eec9a2e5506596494e4623"

[[package]]
name = "syn"
version = "2.0.55"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "002a1b3dbf967edfafc32655d0f377ab0bb7b994aa1d32c8cc7e9b8bf3ebb8f0"
dependencies = [
"proc-macro2",
"quote",
"unicode-ident",
]

[[package]]
name = "unicode-ident"
version = "1.0.12"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"

</details>

[Ddystopia]

Maybe related:
rust-lang/rust#122775

[Ddystopia]

That version of code compiles:

#![feature(type_alias_impl_trait)]

fn main() {
    println!("Hello, world!");
}

struct Arg(&'static i32);

#[embassy_executor::task]
async fn my_task(_a: Arg) {}

[Dirbaio]

duplicate of #2709. It's a rust bug: rust-lang/rust#122775

You can either:

• stick to nightly-2024-03-15 or older
• use embassy-executor from git
• disable feature nightly
• wait until this is fixed in Rust in a future nightly.