Class DebugError

crates/core/src/error/error.rs:1832–1832

            OomOrDynErrorRef::Oom(oom) => f.debug_tuple("Oom").field(oom).finish(),
            OomOrDynErrorRef::DynError(error) => {
                struct DebugError<'a>(SharedPtr<'a, DynError>);
                impl fmt::Debug for DebugError<'_> {
                    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
                        // Safety: invariant of `OomOrDynError` that the pointer