Boa 0.11.0

Boa is a Javascript lexer, parser and Just-in-Time compiler written in Rust. Currently, it has support for some of the language.
Documentation 
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use crate::exec;

#[test]
fn duplicate_function_name() {
    let scenario = r#"
    function f () {}
    function f () {return 12;}
    f()
    "#;

    assert_eq!(&exec(scenario), "12");
}