error: 'bump' is not a ufcs function — a plain function does not dispatch via dot-call
  --> examples/1166-diagnostics-ufcs-not-opted-in.sx:10:19
   |
10 |     print("{}\n", f.bump());
   |                   ^^^^^^

help: call it directly (`bump(receiver, ...)`), pipe it (`receiver |> bump(...)`), or declare it `bump :: ufcs (...) { ... }`
   |
10 |     print("{}\n", f.bump());
   |                   ^^^^^^