tower-limit 0.3.1

Limit maximum request rate to a `Service`.
Documentation 
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use std::fmt;
#[derive(Debug)]
/// An error that can never occur.
pub enum Never {}

impl fmt::Display for Never {
    fn fmt(&self, _: &mut fmt::Formatter) -> fmt::Result {
        match *self {}
    }
}

impl std::error::Error for Never {}