warning: variable `_InappropriateCamelCasing` should have a snake case name
  --> $DIR/command-line-lint-group-warn.rs:5:9
   |
LL |     let _InappropriateCamelCasing = true;
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `_inappropriate_camel_casing`
   |
   = note: `-W non-snake-case` implied by `-W bad-style`