Having been a longtime coder in a language that doesn't support Todo tasks (tooling doesn't find them) I've seen double commenting a line as a trick to make them easily findable (it's the fastest thing to type).

It's a personal hack for being able to quickly find them. Ctrl+F //// is a reasonable "Todo" And one which on a single person project I can get away with. Because they are also valid comments persisting past release occasionally happens as (in my case) the second reviewer doesn't know this convention.

Working on a project for the past several months I've left many todos in my code to be reviewed. In most cases by myself when I better understand the problem. I am after all the first person to review my own code.