Last time that happened to me, it was a mirror, but also not.

I had moved functions from one file to another without changing the contents. As a result, all those lines referred to me.

And since I started thinking, I found this

I always wondered why I always had a hard time making developers not call “if” a “loop”.
Turns out it was on their tests.

Glad I didn’t read my college material, or I would have lost faith in my college professors.