qalam 0.3.1

Interpreter for the Qalam programming language. Qalam is a dead-simple, Urdu inspired, interpreted programming langauge.
Documentation 
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pub mod class;
pub mod function;
pub mod instance;
use std::hash::Hash;

use crate::error::RuntimeError;
use crate::interpreter::Interpreter;
use crate::literal::Literal;
use crate::token::Token;
use std::any::Any;

pub trait QalamCallable: std::fmt::Debug + Any {
    fn call(
        &mut self,
        interpreter: &mut Interpreter,
        arguments: Vec<Option<Literal>>,
        paren: &Token,
    ) -> Result<Option<Literal>, RuntimeError>;
    fn clone_box(&self) -> Box<dyn QalamCallable>;
    fn to_string(&self) -> String;
    fn arity(&self) -> usize;
    fn as_any(&self) -> &dyn Any;
}

impl Clone for Box<dyn QalamCallable> {
    fn clone(&self) -> Self {
        return self.clone_box();
    }
}

impl Hash for Box<dyn QalamCallable> {
    fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
        self.to_string().hash(state)
    }
}

impl PartialEq for Box<dyn QalamCallable> {
    fn eq(&self, other: &Self) -> bool {
        self.clone().to_string() == other.clone().to_string()
    }

    fn ne(&self, other: &Self) -> bool {
        return !self.eq(other);
    }
}

impl Eq for Box<dyn QalamCallable> {}