I'm a fan of this. Not just for debugging either. Giving something a name gets you to think about what a good name would be, which gets you thinking about the

I'm a fan of this. Not just for debugging either. Giving something a name gets you to think about what a good name would be, which gets you thinking about the nature of the thing, which clarifies your thinking about the thing, and leads you to better code. When I've struggled to figure out what the right name for something is, I sometimes realize it's hard because the thing doesn't really make sense. E.g., I might find I want to name two different things the same, which leads me to understand I was confused about the abstractions I was juggling. But it's also always nice to have a place to drop a break point or to automatically see relevant values in debuggers and other tools.