warning: variable `_InappropriateCamelCasing` should have a snake case name such as `_inappropriate_camel_casing`
  --> $DIR/command-line-lint-group-warn.rs:14:9
   |
14 |     let _InappropriateCamelCasing = true;
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: `-W bad-style` implies `-W non-snake-case`