[nomenclature] What is a bug?

[Iain Buclaw]

== Quote from Nick Sabalausky (a at a.a)'s article
> "Lutger" <lutger.blijdestijn at gmail.com> wrote in message
> news:i92j0v$cov$1 at digitalmars.com...
> >
> > Note that bugs may actually be wanted behavior. One such case is uniform
> > function call syntax on arrays, which started life as a compiler bug.
> > Afterwards, the spec was changed and thus the bug was solved.
> >
> Wanted behavior that you didn't know you wanted :) Funny how bugs will
> occasionally inspire features.
> Legend has it that combos in fighting games started out as a bug in the
> original Street Fighter 2 (it would let you perform a new move while you
> were already in the middle of certain other moves.) The "coin boxes with
> multiple coins" in the original Super Mario Bros were added because an early
> bug did that and it turned out to be fun. Happened to me once to: a
> game-like demo I made for a hobbyist embedded system (Hydra) has a faked 3D
> effect which I only thought to put in because an early bug in my rendering
> code resulted in a similar (but less polished) 3D-like effect.

In case somebody hasn't already realised the distinction.
http://faux-rebonds.net/wp-content/uploads/2008/10/bug_vs_feature.gif