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use std::error;
use std::fmt;
#[derive(Debug)]
pub enum Error {
TooManyStates(usize),
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
use self::Error::*;
match *self {
TooManyStates(size_limit) => write!(
f,
"Levenshtein automaton exceeds size limit of \
{} states",
size_limit
),
}
}
}
impl error::Error for Error {
fn description(&self) -> &str {
use self::Error::*;
match *self {
TooManyStates(_) => "levenshtein automaton has too many states",
}
}
fn cause(&self) -> Option<&dyn error::Error> {
None
}
}