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use Fail; /// The `AsFail` trait /// /// This trait is similar to `AsRef<Fail>`, but it is specialized to handle /// the dynamic object of `Fail`. Implementors of `Fail` have a blanket /// implementation. It is used in `failure_derive` in order to generate a /// custom cause. pub trait AsFail { /// Converts a reference to `Self` into a dynamic trait object of `Fail`. fn as_fail(&self) -> &dyn Fail; } impl<T> AsFail for T where T: Fail, { fn as_fail(&self) -> &dyn Fail { self } } impl AsFail for dyn Fail { fn as_fail(&self) -> &dyn Fail { self } } with_std! { use error::Error; impl AsFail for Error { fn as_fail(&self) -> &dyn Fail { self.as_fail() } } }