rlua 0.14.2

High level bindings to Lua 5.3
Documentation 
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use std::borrow::Cow;

use {Lua, String};

fn with_str<F>(s: &str, f: F)
where
    F: FnOnce(String),
{
    let lua = Lua::new();
    let string = lua.create_string(s).unwrap();
    f(string);
}

#[test]
fn compare() {
    // Tests that all comparisons we want to have are usable
    with_str("teststring", |t| assert_eq!(t, "teststring")); // &str
    with_str("teststring", |t| assert_eq!(t, b"teststring")); // &[u8]
    with_str("teststring", |t| assert_eq!(t, b"teststring".to_vec())); // Vec<u8>
    with_str("teststring", |t| assert_eq!(t, "teststring".to_string())); // String
    with_str("teststring", |t| assert_eq!(t, t)); // rlua::String
    with_str("teststring", |t| {
        assert_eq!(t, Cow::from(b"teststring".as_ref()))
    }); // Cow (borrowed)
    with_str("bla", |t| assert_eq!(t, Cow::from(b"bla".to_vec()))); // Cow (owned)
}

#[test]
fn string_views() {
    let lua = Lua::new();
    lua.eval::<()>(
        r#"
            ok = "null bytes are valid utf-8, wh\0 knew?"
            err = "but \xff isn't :("
            empty = ""
        "#,
        None,
    ).unwrap();

    let globals = lua.globals();
    let ok: String = globals.get("ok").unwrap();
    let err: String = globals.get("err").unwrap();
    let empty: String = globals.get("empty").unwrap();

    assert_eq!(
        ok.to_str().unwrap(),
        "null bytes are valid utf-8, wh\0 knew?"
    );
    assert_eq!(
        ok.as_bytes(),
        &b"null bytes are valid utf-8, wh\0 knew?"[..]
    );

    assert!(err.to_str().is_err());
    assert_eq!(err.as_bytes(), &b"but \xff isn't :("[..]);

    assert_eq!(empty.to_str().unwrap(), "");
    assert_eq!(empty.as_bytes_with_nul(), &[0]);
    assert_eq!(empty.as_bytes(), &[]);
}