egglog 0.4.0

egglog is a language that combines the benefits of equality saturation and datalog. It can be used for analysis, optimization, and synthesis of programs. It is the successor to the popular rust library egg.
Documentation 
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#[cfg(feature = "bin")]
#[allow(clippy::disallowed_macros)] // for println!
fn main() {
    use std::{env, process::Command};

    let git_hash = Command::new("git")
        .args(["rev-parse", "--short", "HEAD"])
        .output()
        .map(|output| {
            String::from_utf8(output.stdout)
                .map(|s| "_".to_owned() + &s)
                .unwrap_or_default()
        })
        .unwrap_or_default();
    let build_date = chrono::Utc::now().format("%Y-%m-%d");
    let version = env::var("CARGO_PKG_VERSION").unwrap();
    let full_version = format!("{}_{}{}", version, build_date, git_hash);
    println!("cargo:rustc-env=FULL_VERSION={}", full_version);
}

#[cfg(not(feature = "bin"))]
fn main() {}