---------------------------------------------------------------------
RUN tests/flag-no-summary1.hs --no-summary
FILE tests/flag-no-summary1.hs
main = map f $ map g xs
OUTPUT
tests/flag-no-summary1.hs:1:8-23: Suggestion: Use map once
Found:
  map f $ map g xs
Perhaps:
  map (f . g) xs

EXIT 1
---------------------------------------------------------------------
RUN tests/flag-no-summary2.hs --no-summary
FILE tests/flag-no-summary2.hs
main = return ()
OUTPUT
EXIT 0