X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;ds=sidebyside;f=compiler%2Futils%2FOutputable.lhs;h=622138c17d1dd71deb6450618cd3c2412f93105e;hb=c74c72f60dcc4cbea519826e98ec90ad8016b49d;hp=34ee673ad1d245c3a2d5836a69471811a47d0234;hpb=b0046dd679244886fdc62e5cc2a73128d2e018bb;p=ghc-hetmet.git

diff --git a/compiler/utils/Outputable.lhs b/compiler/utils/Outputable.lhs
index 34ee673..622138c 100644
--- a/compiler/utils/Outputable.lhs
+++ b/compiler/utils/Outputable.lhs
@@ -29,7 +29,7 @@ module Outputable (
 	($$), ($+$), vcat,
 	sep, cat, 
 	fsep, fcat, 
-	hang, punctuate,
+	hang, punctuate, ppWhen, ppUnless,
 	speakNth, speakNTimes, speakN, speakNOf, plural,
 
         -- * Converting 'SDoc' into strings and outputing it
@@ -472,6 +472,13 @@ punctuate p (d:ds) = go d ds
 		   where
 		     go d [] = [d]
 		     go d (e:es) = (d <> p) : go e es
+
+ppWhen, ppUnless :: Bool -> SDoc -> SDoc
+ppWhen True  doc = doc
+ppWhen False _   = empty
+
+ppUnless True  _   = empty
+ppUnless False doc = doc
 \end{code}