Mon Nov 20 20:52:34 UTC 2017

Repository : ssh://git@git.haskell.org/haddock

On branches: 2.17.3.1-spanfix,alexbiehl-patch-1,ghc-8.0,ghc-8.0-facebook,ghc-head,ghc-head1,haddock-quick,headdock-library-1.4.5,ie_avails,issue-303,issue-475,master,pr-filter-maps,pr/cabal-desc,travis,v2.16,v2.17,v2.17.3,v2.18,wip-located-module-as,wip/D2418,wip/T11080-open-data-kinds,wip/T11258,wip/T11430,wip/T12105,wip/T12105-2,wip/T12942,wip/T13163,wip/T3384,wip/embelleshed-rdr,wip/new-tree-one-param,wip/rae,wip/remove-frames,wip/remove-frames1,wip/revert-ttg-2017-11-20,wip/ttg-2017-10-13,wip/ttg-2017-10-31,wip/ttg-2017-11-06,wip/ttg2-2017-11-10,wip/ttg3-2017-11-12,wip/ttg4-constraints-2017-11-13
Link       : http://git.haskell.org/haddock.git/commitdiff/ac10a4ccbe416e8612c6ca49b9f19c3a6f4cf25f

>---------------------------------------------------------------

commit ac10a4ccbe416e8612c6ca49b9f19c3a6f4cf25f
Author: Łukasz Hanuszczak <lukasz.hanuszczak at gmail.com>
Date:   Mon Aug 10 16:14:18 2015 +0200

    Fix weird-looking Hoogle output for familyless classes.


>---------------------------------------------------------------

ac10a4ccbe416e8612c6ca49b9f19c3a6f4cf25f
 haddock-api/src/Haddock/Backends/Hoogle.hs | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/haddock-api/src/Haddock/Backends/Hoogle.hs b/haddock-api/src/Haddock/Backends/Hoogle.hs
index f4f5be9..f6ad980 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

