This crate provides macros for conditional compilation according to rustc compiler version, analogous to #[cfg(...)] and #[cfg_attr(...)].
[dependencies] rustversion = "1.0"
#[rustversion::stable] —
True on any stable compiler.
#[rustversion::stable(1.34)] —
True on exactly the specified stable compiler.
#[rustversion::beta] —
True on any beta compiler.
#[rustversion::nightly] —
True on any nightly compiler or dev build.
#[rustversion::nightly(2019-01-01)] —
True on exactly one nightly.
#[rustversion::since(1.34)] —
True on that stable release and any later compiler, including beta and nightly.
#[rustversion::since(2019-01-01)] —
True on that nightly and all newer ones.
#[rustversion::before(version or date)] —
Negative of #[rustversion::since(...)].
#[rustversion::not(selector)] —
Negative of any selector; for example #[rustversion::not(nightly)].
#[rustversion::any(selectors...)] —
True if any of the comma-separated selectors is true; for example #[rustversion::any(stable, beta)].
#[rustversion::all(selectors...)] —
True if all of the comma-separated selectors are true; for example #[rustversion::all(since(1.31), before(1.34))].
#[rustversion::attr(selector, attribute)] —
For conditional inclusion of attributes; analogous to cfg_attr.
Providing additional trait impls as types are stabilized in the standard library without breaking compatibility with older compilers; in this case Pin<P> stabilized in Rust 1.33:
#[rustversion::since(1.33)] use std::pin::Pin; #[rustversion::since(1.33)] impl<P: MyTrait> MyTrait for Pin<P> { /* ... */ }
Similar but for language features; the ability to control alignment greater than 1 of packed structs was stabilized in Rust 1.33.
#[rustversion::attr(before(1.33), repr(packed))] #[rustversion::attr(since(1.33), repr(packed(2)))] struct Six(i16, i32); fn main() { println!("{}", std::mem::align_of::<Six>()); }
Augmenting code with const as const impls are stabilized in the standard library. This use of const as an attribute is recognized as a special case by the rustversion::attr macro.
use std::time::Duration; #[rustversion::attr(since(1.32), const)] fn duration_as_days(dur: Duration) -> u64 { dur.as_secs() / 60 / 60 / 24 }