Method is

libs/error-stack/src/frame/mod.rs:77–79

(&self)

    /// Returns if `T` is the held context or attachment by this frame.
    #[must_use]
    pub fn is<T: Send + Sync + 'static>(&self) -> bool {
        self.frame.as_any().is::<T>()
    }

    /// Downcasts this frame if the held context or attachment is the same as `T`.
    #[must_use]