rhai 0.15.0

Embedded scripting for Rust
Documentation 
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use rhai::{packages::*, Engine, EvalAltResult, INT};

fn main() -> Result<(), Box<EvalAltResult>> {
    let mut engine = Engine::new_raw();
    engine.load_package(ArithmeticPackage::new().get());

    let result = engine.eval::<INT>("40 + 2")?;

    println!("Answer: {}", result); // prints 42

    Ok(())
}