Duplication hints can't be ignored on the function level

$ hlint --version
HLint v2.0.9, (C) Neil Mitchell 2006-2017

fun = do
  do
    g
    h
    i
  do
    g
    h
    i
{-# ANN fun ("HLint: ignore Reduce duplication" :: String) #-}

=>

test.hs:3:5: Suggestion: Reduce duplication
Found:
  g
  h
  i

Why not:
  Combine with test.hs:7:5

1 hint

If i change the annotation to module instead of fun the warning is ignored as I expect. I also tried placing the fun annotation on top of the function without luck.

Is this a bug or am I making a mistake?

Reproduce the report with HLint v2.0.9 using the shown function and annotation, then trace how module-level and function-level ANN annotations are handled for the “Reduce duplication” hint. Done means the function-level annotation suppresses that hint just as the module-level annotation does.