Function index

crates/vm/src/stdlib/_operator.rs:89–91

(a: PyObjectRef, vm: &VirtualMachine)

    // a.__index__ as raised in the issue. Currently, we accept int subclasses.
    #[pyfunction]
    fn index(a: PyObjectRef, vm: &VirtualMachine) -> PyResult<PyIntRef> {
        a.try_index(vm)
    }

    #[pyfunction]
    fn invert(pos: PyObjectRef, vm: &VirtualMachine) -> PyResult {