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use Fail;
use std::error::Error;
use std::fmt::{self, Debug, Display};
use std::sync::Mutex;

/// Wrapper for `std` errors to make them `Sync`.
///
/// This exists to coerce existing types that are only `Error + Send +
/// 'static` into a `Fail`-compatible representation, most notably for
/// types generated by `error-chain`.
///
/// Unfortunately, this requires wrapping the error in a `Mutex`, which must
/// be locked for every `Debug`/`Display`. Therefore, this should be
/// something of a last resort in making the error work with `failure`.
///
pub struct SyncFailure<T> {
    inner: Mutex<T>,
}

impl<E: Error + Send + 'static> SyncFailure<E> {
    /// Wraps a non-`Sync` `Error` in order to make it implement `Fail`.
    ///
    /// # Example
    ///
    /// ```rust
    /// extern crate failure;
    ///
    /// # use std::error::Error as StdError;
    /// # use std::fmt::{self, Display};
    /// use failure::{Error, SyncFailure};
    /// use std::cell::RefCell;
    ///
    /// #[derive(Debug)]
    /// struct NonSyncError {
    ///     // RefCells are non-Sync, so structs containing them will be
    ///     // non-Sync as well.
    ///     count: RefCell<usize>,
    /// }
    ///
    /// // implement Display/Error for NonSyncError...
    /// #
    /// # impl StdError for NonSyncError {
    /// #     fn description(&self) -> &str {
    /// #         "oops!"
    /// #     }
    /// # }
    /// #
    /// # impl Display for NonSyncError {
    /// #     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
    /// #         write!(f, "oops!")
    /// #     }
    /// # }
    ///
    /// fn returns_error() -> Result<(), NonSyncError> {
    ///     // Do stuff
    ///     # Ok(())
    /// }
    ///
    /// fn my_function() -> Result<(), Error> {
    ///     // without the map_err here, we end up with a compile error
    ///     // complaining that NonSyncError doesn't implement Sync.
    ///     returns_error().map_err(SyncFailure::new)?;
    ///     // Do more stuff
    ///     # Ok(())
    /// }
    /// #
    /// # fn main() {
    /// #    my_function().unwrap();
    /// # }
    /// ```
    ///
    pub fn new(err: E) -> Self {
        SyncFailure {
            inner: Mutex::new(err),
        }
    }
}

impl<T> Display for SyncFailure<T>
where
    T: Display,
{
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        self.inner.lock().unwrap().fmt(f)
    }
}

impl<T> Debug for SyncFailure<T>
where
    T: Debug,
{
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        (*self.inner.lock().unwrap()).fmt(f)
    }
}

impl<E: Error + Send + 'static> Fail for SyncFailure<E> {}

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