use std::fmt;
use std::any::Any;
use std::fmt::Debug;


pub type AssertResult = Result<(), String>;

pub trait Assert<L: Any + Debug> {
    fn compare<R: Any + Debug>(self, target: R) -> AssertResult;
}

pub struct Equal<L> {
    expected: L,
}

impl<L> Equal<L> {
    pub fn new(expected: L) -> Equal<L> {
        Equal { expected: expected }
    }
}

impl<L: 'static + fmt::Debug> Assert<L> for Equal<L> {
    fn compare<R: PartialEq<L> + fmt::Debug>(self, target: R) -> AssertResult {
        if target == self.expected {
            Ok(())
        } else {
            Err(format!(
                "Expected {:?}, recei222ved {:?}",
                self.expected,
                target
            ))
        }
    }
}


fn main() {}