Using 'with'

[Vitaliy Fadeev via Digitalmars-d-learn]

Hi! Did we know you could do this?
To make the `enum` inside the `case` easier to read:

```D
void
func (Event* evt) {
    with (Event.Type)
    switch (evt.type) {
        case SET_E_PROP  : _set_e_prop (evt); break;
        case UPDATE_W    : _update_w   (evt); break;
        case UPDATE_H    : _update_h   (evt); break;
        case UPDATE_XY   : _update_xy  (evt); break;
        default:
    }
}

struct
Event {
union {
    Type type;

    enum
    Type {
        CLICK      =  1,
        UPDATE,
        SET_E_PROP,
        UPDATE_W,
        UPDATE_H,
        UPDATE_XY,
    }
}

```

Check the **with (Event.Type)**.