Function lockstep_range 

pub fn lockstep_range(version: &str) -> String

The autumn-web range a crate released in lockstep with the framework declares support for.

First-party plugins ship at the framework’s own version, so their supported range is their own version’s compatibility key: the MAJOR.MINOR series below 1.0 (where STABILITY.md treats every minor bump as breaking), and the major from 1.0 on.

Pass env!("CARGO_PKG_VERSION") rather than a literal so a version bump cannot leave a stale range behind:

use autumn_web::plugin_contract::{PluginContract, lockstep_range};

let contract = PluginContract::new(env!("CARGO_PKG_NAME"))
    .autumn_web(lockstep_range(env!("CARGO_PKG_VERSION")));

This is for lockstep crates only

A crate that versions independently of autumn-web must not use this: a third-party plugin at its own 1.2.0 would derive "1", which excludes every 0.x framework and makes every consuming app fail at registration. Write the range you actually support as a literal instead.

A version this cannot split into MAJOR.MINOR is returned trimmed but otherwise unchanged, so the malformed value reaches evaluate as written rather than being silently reshaped into a range that means something else. Note that some such strings — "1", or the empty string — are valid Cargo requirements (^1 and *), so a caller passing something other than env!("CARGO_PKG_VERSION") should validate it.