Function top_encode_from_nested_or_exit 

pub fn top_encode_from_nested_or_exit<T, O, ExitCtx>(
    obj: &T,
    output: O,
    c: ExitCtx,
    exit: fn(ExitCtx, EncodeError) -> !,
)
where
    O: TopEncodeOutput,
    T: NestedEncode,
    ExitCtx: Clone,