==> alcoholic_drink__define.pro <==
pro alcoholic_drink__define
  struct = {alcoholic_drink, proof : 0, inherits drink}
end

==> beer__define.pro <==
pro beer__define
  struct = {beer, inherits alcoholic_drink}
end

==> drink__define.pro <==
pro drink__define
  struct = {drink, color : 0}
end
% Compiled module: BEER__DEFINE.
% Compiled module: ALCOHOLIC_DRINK__DEFINE.
% Compiled module: DRINK__DEFINE.
bottle is a[n] BEER
beer has 1 direct superclass[es]: ALCOHOLIC_DRINK
