/// Create a new exception from any error type.

    /// Create a new error object from any error type.

    /// View this exception as the underlying error.

    /// View this error object as the underlying error.

    /// View this exception as the underlying error, mutably.

    /// View this error object as the underlying error, mutably.

            .expect("exception backtrace capture failed")

            .expect("backtrace capture failed")

    /// This iterator will visit every error in the "cause chain" of this exception, beginning with
    /// the error that this exception was created from.

    /// This iterator will visit every error in the "cause chain" of this error object, beginning with
    /// the error that this error object was created from.

    /// Returns `true` if `E` is the type wrapped by this exception.

    /// Returns `true` if `E` is the type wrapped by this error object.

    /// Attempt to downcast the exception to a concrete type.

    /// Attempt to downcast the error object to a concrete type.

    /// Downcast this exception by reference.

    /// Downcast this error object by reference.

    /// Downcast this exception by mutable reference.

    /// Downcast this error object by mutable reference.

    fn size_of_exception() {

    fn size_of_error() {

    fn assert_exception_autotraits()

    fn assert_error_autotraits()

/// Construct an ad-hoc exception from a string.

/// Construct an ad-hoc error from a string.