indent: don't use tab characters
lay (NilAbove p) no_doc = nl_text `txt` lay p cant_fail -- NoDoc always on first line
lay (TextBeside s sl p) no_doc = s `txt` lay p no_doc
-indent n | n >= 8 = '\t' : indent (n - 8)
- | otherwise = spaces n
+-- OLD version: we shouldn't rely on tabs being 8 columns apart in the output.
+-- indent n | n >= 8 = '\t' : indent (n - 8)
+-- | otherwise = spaces n
+indent n = spaces n
multi_ch 0 ch = ""
multi_ch n ch = ch : multi_ch (n - 1) ch