struct Context<'s>(&'s str);

// 's : 'c tells Rust that the 's lifetime is tied to the 'c lifetime
struct Parser<'c, 's : 'c> {
    context: &'c Context<'s>,
}

impl<'c, 's> Parser<'c, 's> {
    fn parse(&self) -> Result<(), &'s str> {
        Err(&self.context.0[1..])
    }
}

fn parse_context(context: Context) -> Result<(), &str> {
    Parser { context: &context }.parse()
}

struct Ref<'a, T: 'a>(&'a T);

#[cfg(test)]
mod tests {
    #[test]
    fn it_works() {
        assert_eq!(2 + 2, 4);
    }
}