| x undefined? true | |
| TypeError: Cannot read property "foo" from undefined | |
| TypeError: Cannot set property "bar" of undefined | |
| TypeError: Cannot read property "1" from undefined | |
| TypeError: Cannot set property "0" of undefined | |
| TypeError: Cannot read property "func" from undefined | |
| TypeError: Cannot delete property "0" of undefined | |
| TypeError: Cannot delete property "foo" of undefined | |
| TypeError: undefined is not an Object | |
| TypeError: Cannot apply "with" to undefined |