Object o = null; o.opCmp(new Object); // segmentation fault on my OSX machine
This seems a bit non-D-ish to me, as other bugs like this throw Errors (e.g. RangeError).
It would be nice if it would throw a NullPointerError or something like that, because I spent a long time trying to find a bug that crashed the program before writeln-debugging statements could be flushed.
NMS