Derive Macro TryFromList 

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

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

• Named structs: extract by field name
• Tuple structs: extract by position (0, 1, 2, …)
• Fields annotated #[into_list(ignore)] are not read and are initialized with Default::default()