let result = parse("(s) => `hello from ${s}!`");

match result {
    Ok(expr) => {
        println!("{:#?}", expr);
    }
    Err(err) => {
        println!("{:#?}", err);
    }
}

ArrowFunction {
    params: [
        Identifier {
            token: Identifier(
                "s",
            ),
        },
    ],
    body: TemplateLiteral {
        quasis: [
            TemplateString {
                token: String(
                    "hello from ",
                ),
                tail: false,
            },
            TemplateString {
                token: String(
                    "!",
                ),
                tail: true,
            },
        ],
        expressions: [
            Identifier {
                token: Identifier(
                    "s",
                ),
            },
        ],
    },
}