#expect #warnings #clippy #lint #macro

macro flexpect

#[flexpect::e(...)] compiles to #[expect(...)] for newer versions of Rust and to #[allow(...)] when not supported

6 releases

new 0.1.1 Mar 16, 2025
0.1.0 Mar 16, 2025
0.0.4 Sep 28, 2024

#257 in Procedural macros

Download history 460/week @ 2024-11-24 357/week @ 2024-12-01 602/week @ 2024-12-08 698/week @ 2024-12-15 642/week @ 2024-12-22 635/week @ 2024-12-29 707/week @ 2025-01-05 760/week @ 2025-01-12 748/week @ 2025-01-19 1028/week @ 2025-01-26 858/week @ 2025-02-02 461/week @ 2025-02-09 824/week @ 2025-02-16 932/week @ 2025-02-23 867/week @ 2025-03-02 662/week @ 2025-03-09

3,336 downloads per month

MIT/Apache

9KB
51 lines

flexpect

#[flexpect::e(...)] compiles to #[expect(...)] for newer versions of Rust and to #[allow(...)] when not supported.

Purpose

This crate enables getting the benefits of #[expect(...)] while maintaining a minimum supported Rust version that's earlier than 1.81.

Usage

Add flexpect to your Cargo.toml:

[dependencies]
flexpect = "0.1.0"

Then use the #[flexpect::e(...)] or #[flexpect::flexpect(...)] attributes instead of #[expect(...)]:

// instead of #[expect(unused_variables)]
#[flexpect::e(unused_variables)]
fn example() {
    let x = 1;
}
use flexpect::flexpect;

// instead of #[expect(clippy::clone_on_copy)]
#[flexpect(clippy::clone_on_copy)]
fn clippy_example() {
    let _ = 32.clone();
}

How it works

  • On Rust versions before 1.43.0, the attribute is ignored due to compiler bugs.
  • From Rust 1.43.0 to 1.80, it translates to #[allow(...)].
  • From Rust 1.81 onwards, it translates to #[expect(...)].

The minimum supported Rust version is 1.38.

Limitations

flexpect does not work as inner attributes (#![flexpect::e(...)]) nor on statements, expressions or blocks due to compiler limitations.

Dependencies