halacha theory - Eating outside of a Sukkah - Negative or Positive commandment?

On Sukkoth we are required to dwell in a Sukkah, which is generally minimally defined as at least eating our meals (which in turn is generally minimally defined as grain-based products) inside the Sukkah. If one was outside of a Sukkah (whether outside unsheltered entirely or inside a building) and ate something that meets the minimum definition of a food that is required to be eaten inside a Sukkah, would that be an activity that falls under the category of a Lo Tha'aseh (prohibition), a Bittul 'Aseh (not actively fulfilling a positive commandment), or an Isur 'Aseh (prohibition due to falling outside the requirements of a positive commandment)?

Answer

There is no lav in the Torah against eating outside the Sukkah, so it would just be a bitul aseh. It says "Basukkos teshvu", but does not say anythink like "lo tochal chutz me'suka".