rush_expr_engine 0.1.2

The rules engine is based on the rete algorithm
Documentation 
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use std::error::Error;
use std::fmt;

#[derive(Default, Debug)]
pub struct NotFoundFieldError(pub String);

impl fmt::Display for NotFoundFieldError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "not found field[{}]", self.0.as_str())
    }
}

impl Error for NotFoundFieldError {}