I've had less success pointing out errors to people 'smarter' than me. One was stuck learning C because they knew just enough about scope to be dangerous. They

I've had less success pointing out errors to people 'smarter' than me. One was stuck learning C because they knew just enough about scope to be dangerous. They'd declared 'i' globally and used it in every subroutine for looping. Which failed confusingly when they called one looping function inside a loop in another. No amount of insisting each function needed it's own 'i' would convince them. I left them to it.