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rhai 0.19.10

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

#[test]
fn test_increment() -> Result<(), Box<EvalAltResult>> {
    let engine = Engine::new();

    assert_eq!(engine.eval::<INT>("let x = 1; x += 2; x")?, 3);

    assert_eq!(
        engine.eval::<String>("let s = \"test\"; s += \"ing\"; s")?,
        "testing"
    );

    Ok(())
}