Method try_from

crates/derive-impl/src/from_args.rs:21–29

(ident: &Ident)

    type Error = ();

    fn try_from(ident: &Ident) -> core::result::Result<Self, Self::Error> {
        Ok(match ident.to_string().as_str() {
            "positional" => Self::PositionalOnly,
            "any" => Self::PositionalOrKeyword,
            "named" => Self::KeywordOnly,
            "flatten" => Self::Flatten,
            _ => return Err(()),
        })
    }
}

// None == quote!(Default::default())