use crate::obj::prelude::*;
use snafu::Snafu;

#[derive(Debug, Snafu)]
pub enum Error {
    #[snafu(display("missing attribute: {}", global_sym_lookup(*attr).unwrap()))]
    MissingAttr {
        attr: Sym,
    },

    #[snafu(display("{}", error))]
    ValueError {
        error: String,
        value: ObjRef,
    },

    #[snafu(display("incorrect function arity; expected {} but got {} instead", expected, got))]
    ArityError {
        expected: usize,
        got: usize,
    },
}

pub type Result<T, E = Error> = std::result::Result<T, E>;