Derive Macro IntoList 

#[derive(IntoList)]
{
    // Attributes available to this derive:
    #[into_list]
}

Derive IntoList for a struct (Rust → R list).

• Named structs → named R list: list(x = 1L, y = 2L)
• Tuple structs → unnamed R list: list(1L, 2L)
• Fields annotated #[into_list(ignore)] are skipped