Method update_for_func

crates/rust/src/lib.rs:1688–1693

(&mut self, func: &Function)

impl FnSig {
    fn update_for_func(&mut self, func: &Function) {
        if let FunctionKind::Method(_) | FunctionKind::AsyncMethod(_) = &func.kind {
            self.self_arg = Some("&self".into());
            self.self_is_first_param = true;
        }
    }
}

pub fn to_rust_ident(name: &str) -> String {