Is this parlour trick so different from useful tasks like “implement this feature while following the naming conventions of my project”?
The way most people are coding with AI today is like Baby's First AI™ compared to how we'll all be using LLMs for coding in the future. Soon that "double check everything" step will be built in to the coding agents and you'll have configuration options for how many passes you want it to perform (speed VS accuracy tradeoff).