macro_rules! impl_tuple_into_r {
($n:literal, $name:literal; $($T:ident $R:ident $idx:tt),+) => { ... };
}Expand description
Convert Rust tuples to unnamed R lists, collecting every failing field.
Field error types may differ; their messages share the existing batched
conversion format with 1-based positions, wrapped in IntoRError::Inner.