Function test_try_borrow_while_borrow_mut

tests/test_sharedref.rs:134–139

()

#[test]
fn test_try_borrow_while_borrow_mut() {
    let (gil, owner) = prepare_env();
    let py = gil.python();
    let _mut_ref = owner.string(py).borrow_mut();
    assert!(owner.string(py).try_borrow().is_err());
}

#[test]
#[should_panic(expected = "already mutably borrowed")]