[koenigdavidmj]

Done that before...had a variable that was formerly an int:

  int foo = 0;

But got changed into a non-integral type:

  Thing foo = 0;

Turns out Thing had a copy constructor roughly like:

  Thing::Thing(Thing* old)
      : field(old->field)
  {
  }

Needless to say, my program was not very happy.