pub fn derive_prefer_data_frame(input: DeriveInput) -> Result<TokenStream>Expand description
Derive PreferDataFrame: adds the PrefersDataFrame marker trait and an
IntoR impl that converts to R via IntoDataFrame::into_data_frame, then into_sexp.
The type must implement IntoDataFrame (typically the companion struct generated
by #[derive(DataFrameRow)]). The generated IntoR::Error is Infallible.