metrics/recorder/
errors.rs

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use std::{error::Error, fmt};

const SET_RECORDER_ERROR: &str =
    "attempted to set a recorder after the metrics system was already initialized";

/// Error returned when trying to install a global recorder when another has already been installed.
pub struct SetRecorderError<R>(pub R);

impl<R> SetRecorderError<R> {
    /// Returns the recorder that was attempted to be set.
    pub fn into_inner(self) -> R {
        self.0
    }
}

impl<R> fmt::Debug for SetRecorderError<R> {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.debug_struct("SetRecorderError").finish_non_exhaustive()
    }
}

impl<R> fmt::Display for SetRecorderError<R> {
    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
        fmt.write_str(SET_RECORDER_ERROR)
    }
}

impl<R> Error for SetRecorderError<R> {}