I took a week of vacation to work through Programming Rust uninterrupted. I have no immediate professional use for it, but it’s pretty clearly going to be important, and it has at least one new (to me) paradigm, so I wanted to fill that gap in knowledge. But I’m under no illusion that I “know Rust” after doing that! I just inched up to a more comfortable place on the learning curve.

BTW, I know there are plenty of people who wouldn’t consider that a vacation, and that’s fine, but they are different from me.