From 0e1cad7c38ed1a771794d9332233f784a52d2c1a Mon Sep 17 00:00:00 2001
From: Łukasz Hanuszczak <lukasz.hanuszczak@gmail.com>
Date: Mon, 6 Jul 2015 18:07:20 +0200
Subject: Fix bug with module name being hyperlinked to `Prelude`.

---
 haddock-api/src/Haddock/Backends/Hyperlinker/Ast.hs         | 7 ++++---
 haddock-api/test/Haddock/Backends/Hyperlinker/ParserSpec.hs | 1 +
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/haddock-api/src/Haddock/Backends/Hyperlinker/Ast.hs b/haddock-api/src/Haddock/Backends/Hyperlinker/Ast.hs
index 28fdc3f5..71b73663 100644
--- a/haddock-api/src/Haddock/Backends/Hyperlinker/Ast.hs
+++ b/haddock-api/src/Haddock/Backends/Hyperlinker/Ast.hs
@@ -146,7 +146,7 @@ decls (group, _, _, _) = concatMap ($ group)
 -- import lists.
 imports :: GHC.RenamedSource -> DetailsMap
 imports src@(_, imps, _, _) =
-    everything (<|>) ie src ++ map (imp . GHC.unLoc) imps
+    everything (<|>) ie src ++ mapMaybe (imp . GHC.unLoc) imps
   where
     ie term = case cast term of
         (Just (GHC.IEVar v)) -> pure $ var v
@@ -156,9 +156,10 @@ imports src@(_, imps, _, _) =
         _ -> empty
     typ (GHC.L sspan name) = (sspan, RtkType name)
     var (GHC.L sspan name) = (sspan, RtkVar name)
-    imp idecl =
+    imp idecl | not . GHC.ideclImplicit $ idecl =
         let (GHC.L sspan name) = GHC.ideclName idecl
-        in (sspan, RtkModule name)
+        in Just (sspan, RtkModule name)
+    imp _ = Nothing
 
 -- | Check whether token stream span matches GHC source span.
 --
diff --git a/haddock-api/test/Haddock/Backends/Hyperlinker/ParserSpec.hs b/haddock-api/test/Haddock/Backends/Hyperlinker/ParserSpec.hs
index a76bdcdc..8cd2690e 100644
--- a/haddock-api/test/Haddock/Backends/Hyperlinker/ParserSpec.hs
+++ b/haddock-api/test/Haddock/Backends/Hyperlinker/ParserSpec.hs
@@ -5,6 +5,7 @@ import Test.Hspec
 import Test.QuickCheck
 
 import Haddock.Backends.Hyperlinker.Parser
+import Haddock.Backends.Hyperlinker.Types
 
 
 main :: IO ()
-- 
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