src/tools/clippy/src/docs/just_underscores_and_digits.txt


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### What it does
Checks if you have variables whose name consists of just
underscores and digits.

### Why is this bad?
It's hard to memorize what a variable means without a
descriptive name.

### Example
```
let _1 = 1;
let ___1 = 1;
let __1___2 = 11;
```