Method __enter__

crates/stdlib/src/mmap.rs:1414–1417

(zelf: &Py<Self>, vm: &VirtualMachine)

        #[pymethod]
        fn __enter__(zelf: &Py<Self>, vm: &VirtualMachine) -> PyResult<PyRef<Self>> {
            let _m = zelf.check_valid(vm)?;
            Ok(zelf.to_owned())
        }

        #[pymethod]
        fn __exit__(zelf: &Py<Self>, _args: FuncArgs, vm: &VirtualMachine) -> PyResult<()> {