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//From Ring Crate #[derive(Clone, Copy, Debug, PartialEq)] pub struct Unspecified; impl Unspecified { fn description_() -> &'static str { "mohan::error::Unspecified" } } // This is required for the implementation of `std::error::Error`. impl core::fmt::Display for Unspecified { fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result { f.write_str(Self::description_()) } }