From ac10a4ccbe416e8612c6ca49b9f19c3a6f4cf25f Mon Sep 17 00:00:00 2001
From: Łukasz Hanuszczak <lukasz.hanuszczak@gmail.com>
Date: Mon, 10 Aug 2015 16:14:18 +0200
Subject: Fix weird-looking Hoogle output for familyless classes.

---
 haddock-api/src/Haddock/Backends/Hoogle.hs | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

(limited to 'haddock-api/src/Haddock/Backends/Hoogle.hs')

diff --git a/haddock-api/src/Haddock/Backends/Hoogle.hs b/haddock-api/src/Haddock/Backends/Hoogle.hs
index f4f5be90..f6ad9808 100644
--- a/haddock-api/src/Haddock/Backends/Hoogle.hs
+++ b/haddock-api/src/Haddock/Backends/Hoogle.hs
@@ -160,7 +160,7 @@ ppSig dflags x  = ppSigWithDoc dflags x []
 
 -- note: does not yet output documentation for class methods
 ppClass :: DynFlags -> TyClDecl Name -> [(Name, DocForDecl Name)] -> [String]
-ppClass dflags decl subdocs = (out dflags decl' ++ " " ++ ppTyFams) : ppMethods
+ppClass dflags decl subdocs = (out dflags decl' ++ ppTyFams) : ppMethods
     where
         decl' = decl
             { tcdSigs = [], tcdMeths = emptyBag
@@ -170,10 +170,12 @@ ppClass dflags decl subdocs = (out dflags decl' ++ " " ++ ppTyFams) : ppMethods
         ppMethods = concat . map (ppSig' . unLoc) $ tcdSigs decl
         ppSig' = flip (ppSigWithDoc dflags) subdocs . addContext
 
-        ppTyFams = showSDocUnqual dflags . whereWrapper $ concat
-            [ map ppr (tcdATs decl)
-            , map (ppr . tyFamEqnToSyn . unLoc) (tcdATDefs decl)
-            ]
+        ppTyFams
+            | null $ tcdATs decl = ""
+            | otherwise = (" " ++) . showSDocUnqual dflags . whereWrapper $ concat
+                [ map ppr (tcdATs decl)
+                , map (ppr . tyFamEqnToSyn . unLoc) (tcdATDefs decl)
+                ]
 
         whereWrapper elems = vcat'
             [ text "where" <+> lbrace
-- 
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