warning: function `FUNCTION` should have a snake case name
  --> $DIR/lint-group-allow-warnings.rs:9:8
   |
LL | pub fn FUNCTION() {}
   |        ^^^^^^^^ help: convert the identifier to snake case: `function`
   |
   = note: `--force-warn non-snake-case` implied by `--force-warn nonstandard-style`

warning: 1 warning emitted