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//! Error types
use std::error;
use std::fmt;

pub type Result<T> = std::result::Result<T, Box<dyn error::Error>>;

#[derive(Debug, Clone)]
pub struct ParseError();

impl fmt::Display for ParseError {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "parse error")
    }
}

impl error::Error for ParseError {
    fn source(&self) -> Option<&(dyn error::Error + 'static)> {
        // Generic error, underlying cause isn't tracked.
        None
    }
}

#[derive(Debug, Clone)]
pub struct UnimplementedError();

impl fmt::Display for UnimplementedError {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "unimplemented")
    }
}

impl error::Error for UnimplementedError {
    fn source(&self) -> Option<&(dyn error::Error + 'static)> {
        // Generic error, underlying cause isn't tracked.
        None
    }
}