In this case, you would use 'was' because you just finished eating, but the word 'diner' on the other hand, is a bit old fashioned. For Americans, the word 'diner' refers to a restaurant that serves stereotypical American food, such as hamburgers or meat loaf. When the word 'diner' comes to my mind, I usually think of a place that looks like this
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PreciousJonesWe just got done at aIn British English, that would mean that we had just been cheated. We would say something like "We have just eaten at/tried/dined at ..."nJapanese restaurant.
fivejedjon PreciousJonesWe just got done at an Japanese restaurant.In British English, that would mean that we had just been cheated. We would say something like "We have just eaten at/tried/dined at ..."Shouldn't it be: