Function vars

crates/vm/src/stdlib/builtins.rs:1155–1162

(obj: OptionalArg, vm: &VirtualMachine)

    #[pyfunction]
    fn vars(obj: OptionalArg, vm: &VirtualMachine) -> PyResult {
        if let OptionalArg::Present(obj) = obj {
            obj.get_attr(identifier!(vm, __dict__), vm)
                .map_err(|_| vm.new_type_error("vars() argument must have __dict__ attribute"))
        } else {
            Ok(vm.current_locals()?.into())
        }
    }

    #[pyfunction]
    pub fn __build_class__(