Fortunately, it's not nearly as bad as putting gasoline in a diesel vehicle! Gas ignites at a lower temperature and does not provide the lubrication that a diesel engine needs, it can cause melt-down in a diesel engine. The diesel in a gas engine problem is more of fouling and making sure it is out of ALL systems so that the engine will run properly. Certainly, still no fun! When I was a kid, our boat ran out of gas, and a passing barge gave us gas which had apparently been put into a can that still had some diesel in it. The boat never did run right after that incident!
"If you're not living on the edge --- you're taking up too much space!!"