From 730d8b0e76c5e637f2cdd7d980865f6208729366 Mon Sep 17 00:00:00 2001
From: Łukasz Hanuszczak <lukasz.hanuszczak@gmail.com>
Date: Wed, 29 Jul 2015 18:43:39 +0200
Subject: Create helper method for specializing type signatures.

---
 haddock-api/src/Haddock/Backends/Xhtml/Decl.hs       |  9 ++-------
 haddock-api/src/Haddock/Backends/Xhtml/Specialize.hs | 18 +++++++++++++-----
 2 files changed, 15 insertions(+), 12 deletions(-)

diff --git a/haddock-api/src/Haddock/Backends/Xhtml/Decl.hs b/haddock-api/src/Haddock/Backends/Xhtml/Decl.hs
index 294af864..7255bf42 100644
--- a/haddock-api/src/Haddock/Backends/Xhtml/Decl.hs
+++ b/haddock-api/src/Haddock/Backends/Xhtml/Decl.hs
@@ -31,7 +31,6 @@ import Haddock.Doc (combineDocumentation)
 
 import           Data.List             ( intersperse, sort )
 import qualified Data.Map as Map
-import qualified Data.Set as Set
 import           Data.Maybe
 import           Text.XHtml hiding     ( name, title, p, quote )
 
@@ -601,13 +600,9 @@ ppInstanceSigs :: LinksInfo -> Splice -> Unicode -> Qualification
               -> LHsTyVarBndrs DocName -> [HsType DocName] -> [Sig DocName]
               -> [Html]
 ppInstanceSigs links splice unicode qual bndrs tys sigs = do
-    TypeSig lnames (L loc typ) _ <- sigs
+    TypeSig lnames (L loc typ) _ <- map (specializeSig bndrs tys) sigs
     let names = map unLoc lnames
-    let typ' = rename' . sugar $ specializeTyVarBndrs bndrs tys typ
-    return $ ppSimpleSig links splice unicode qual loc names typ'
-  where
-    fv = foldr Set.union Set.empty . map freeVariables $ tys
-    rename' = rename fv
+    return $ ppSimpleSig links splice unicode qual loc names typ
 
 
 lookupAnySubdoc :: Eq id1 => id1 -> [(id1, DocForDecl id2)] -> DocForDecl id2
diff --git a/haddock-api/src/Haddock/Backends/Xhtml/Specialize.hs b/haddock-api/src/Haddock/Backends/Xhtml/Specialize.hs
index 109788fd..2295605b 100644
--- a/haddock-api/src/Haddock/Backends/Xhtml/Specialize.hs
+++ b/haddock-api/src/Haddock/Backends/Xhtml/Specialize.hs
@@ -5,11 +5,7 @@
 
 
 module Haddock.Backends.Xhtml.Specialize
-    ( specialize, specialize'
-    , specializeTyVarBndrs
-    , specializePseudoFamilyDecl
-    , sugar, rename
-    , freeVariables
+    ( specializePseudoFamilyDecl, specializeSig
     ) where
 
 
@@ -80,6 +76,18 @@ specializePseudoFamilyDecl bndrs typs decl =
     specializeTyVars = specializeTyVarBndrs bndrs typs
 
 
+specializeSig :: (Eq name, Typeable name, DataId name, SetName name)
+              => LHsTyVarBndrs name -> [HsType name]
+              -> Sig name
+              -> Sig name
+specializeSig bndrs typs (TypeSig lnames (L loc typ) prn) =
+    TypeSig lnames (L loc typ') prn
+  where
+    typ' = rename fv . sugar $ specializeTyVarBndrs bndrs typs typ
+    fv = foldr Set.union Set.empty . map freeVariables $ typs
+specializeSig _ _ sig = sig
+
+
 -- | Make given type use tuple and list literals where appropriate.
 --
 -- After applying 'specialize' function some terms may not use idiomatic list
-- 
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