Make -dppr-debug print locations in HsSyn

[ghc-hetmet.git] / compiler / utils / Outputable.lhs

diff --git a/compiler/utils/Outputable.lhs b/compiler/utils/Outputable.lhs
index 34ee673..622138c 100644 (file)
--- 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}