Method next

crates/core/src/error/error.rs:1945–1962

(&mut self)

    #[inline]
    fn next(&mut self) -> Option<Self::Item> {
        match &mut self.state {
            ChainState::Ours(e) => {
                let core = e.inner.as_dyn_core_error();
                self.state = if let Some(e) = e.inner.source() {
                    ChainState::Ours(e)
                } else {
                    ChainState::Core(core.source())
                };
                Some(core)
            }
            ChainState::Core(error) => {
                let e = error.take()?;
                self.state = ChainState::Core(e.source());
                Some(e)
            }
        }
    }
}

impl FusedIterator for Chain<'_> {}