warning: variable `_InappropriateCamelCasing` should have a snake case name such as `_inappropriate_camel_casing`
  --> $DIR/command-line-lint-group-warn.rs:15:9
   |
LL |     let _InappropriateCamelCasing = true;
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: `-W non-snake-case` implied by `-W bad-style`