diff --git a/src-literatetests/15-regressions.blt b/src-literatetests/15-regressions.blt
index 52306c1..e7bf199 100644
--- a/src-literatetests/15-regressions.blt
+++ b/src-literatetests/15-regressions.blt
@@ -653,11 +653,12 @@ jaicyhHumzo btrKpeyiFej mava = do
 
 #test unboxed-tuple and vanilla names
 {-# LANGUAGE UnboxedTuples #-}
+spanKey :: (# Int, Int #) -> (# Int, Int #)
 spanKey = case foo of
   (# bar, baz #) -> (# baz, bar #)
 
 #test unboxed-tuple and hashed name
 {-# LANGUAGE MagicHash, UnboxedTuples #-}
-spanKey :: _ -> (# Int#, Int# #)
+spanKey :: (# Int#, Int# #) -> (# Int#, Int# #)
 spanKey = case foo of
   (# bar#, baz# #) -> (# baz# +# bar#, bar# #)
diff --git a/src/Language/Haskell/Brittany/Internal/LayouterBasics.hs b/src/Language/Haskell/Brittany/Internal/LayouterBasics.hs
index d5aac63..c6cd9ae 100644
--- a/src/Language/Haskell/Brittany/Internal/LayouterBasics.hs
+++ b/src/Language/Haskell/Brittany/Internal/LayouterBasics.hs
@@ -50,7 +50,12 @@ module Language.Haskell.Brittany.Internal.LayouterBasics
   , appSep
   , docCommaSep
   , docParenLSep
+  , docParenL
   , docParenR
+  , docParenHashL
+  , docParenHashR
+  , docBracketL
+  , docBracketR
   , docTick
   , spacifyDocs
   , briDocMToPPM
@@ -530,11 +535,27 @@ docCommaSep :: ToBriDocM BriDocNumbered
 docCommaSep = appSep $ docLit $ Text.pack ","
 
 docParenLSep :: ToBriDocM BriDocNumbered
-docParenLSep = appSep $ docLit $ Text.pack "("
+docParenLSep = appSep docParenL
+
+docParenL :: ToBriDocM BriDocNumbered
+docParenL = docLit $ Text.pack "("
 
 docParenR :: ToBriDocM BriDocNumbered
 docParenR = docLit $ Text.pack ")"
 
+docParenHashL :: ToBriDocM BriDocNumbered
+docParenHashL =  docSeq [docLit $ Text.pack "(#", docSeparator]
+
+docParenHashR :: ToBriDocM BriDocNumbered
+docParenHashR = docSeq [docSeparator, docLit $ Text.pack "#)"]
+
+docBracketL :: ToBriDocM BriDocNumbered
+docBracketL = docLit $ Text.pack "["
+
+docBracketR :: ToBriDocM BriDocNumbered
+docBracketR = docLit $ Text.pack "]"
+
+
 docTick :: ToBriDocM BriDocNumbered
 docTick = docLit $ Text.pack "'"
 
diff --git a/src/Language/Haskell/Brittany/Internal/Layouters/Expr.hs b/src/Language/Haskell/Brittany/Internal/Layouters/Expr.hs
index 96b739c..a486d3b 100644
--- a/src/Language/Haskell/Brittany/Internal/Layouters/Expr.hs
+++ b/src/Language/Haskell/Brittany/Internal/Layouters/Expr.hs
@@ -372,10 +372,7 @@ layoutExpr lexpr@(L _ expr) = do
       hasComments <- hasAnyCommentsBelow lexpr
       let (openLit, closeLit) = case boxity of
             Boxed   -> (docLit $ Text.pack "(", docLit $ Text.pack ")")
-            Unboxed ->
-              ( docSeq [docLit $ Text.pack "(#", docSeparator]
-              , docSeq [docSeparator, docLit $ Text.pack "#)"]
-              )
+            Unboxed -> (docParenHashL, docParenHashR)
       case splitFirstLast argDocs of
         FirstLastEmpty -> docSeq
           [ openLit
diff --git a/src/Language/Haskell/Brittany/Internal/Layouters/Pattern.hs b/src/Language/Haskell/Brittany/Internal/Layouters/Pattern.hs
index 6c95e0b..6b8e750 100644
--- a/src/Language/Haskell/Brittany/Internal/Layouters/Pattern.hs
+++ b/src/Language/Haskell/Brittany/Internal/Layouters/Pattern.hs
@@ -140,8 +140,8 @@ layoutPat lpat@(L _ pat) = docWrapNode lpat $ case pat of
     -- (nestedpat1, nestedpat2, nestedpat3) -> expr
     -- (#nestedpat1, nestedpat2, nestedpat3#) -> expr
     case boxity of
-      Boxed   -> wrapPatListy args "(" ")" False
-      Unboxed -> wrapPatListy args "(#" "#)" True
+      Boxed   -> wrapPatListy args "()" docParenL docParenR
+      Unboxed -> wrapPatListy args "(##)" docParenHashL docParenHashR
   AsPat asName asPat -> do
     -- bind@nestedpat -> expr
     wrapPatPrepend asPat (docLit $ lrdrNameToText asName <> Text.pack "@")
@@ -172,7 +172,7 @@ layoutPat lpat@(L _ pat) = docWrapNode lpat $ case pat of
   ListPat elems _ _ ->
     -- [] -> expr1
     -- [nestedpat1, nestedpat2, nestedpat3] -> expr2
-    wrapPatListy elems "[" "]" False
+    wrapPatListy elems "[]" docBracketL docBracketR
   BangPat pat1 -> do
     -- !nestedpat -> expr
     wrapPatPrepend pat1 (docLit $ Text.pack "!")
@@ -212,24 +212,18 @@ wrapPatPrepend pat prepElem = do
 wrapPatListy
   :: [Located (Pat GhcPs)]
   -> String
-  -> String
-  -> Bool
+  -> ToBriDocM BriDocNumbered
+  -> ToBriDocM BriDocNumbered
   -> ToBriDocM (Seq BriDocNumbered)
-wrapPatListy elems start end padSeparators = do
+wrapPatListy elems both start end = do
   elemDocs <- Seq.fromList elems `forM` (layoutPat >=> colsWrapPat)
   case Seq.viewl elemDocs of
-    Seq.EmptyL -> fmap Seq.singleton $ docLit $ Text.pack $ start ++ end
+    Seq.EmptyL -> fmap Seq.singleton $ docLit $ Text.pack both
     x1 Seq.:< rest -> do
-      sDoc <- docLit $ Text.pack start
-      eDoc <- docLit $ Text.pack end
-      let sDoc' | padSeparators = docSeq [return sDoc, docSeparator]
-                | otherwise     = return sDoc
-          eDoc' | padSeparators = docSeq [docSeparator, return eDoc]
-                | otherwise     = return eDoc
-      sDoc'' <- sDoc'
-      eDoc'' <- eDoc'
+      sDoc <- start
+      eDoc <- end
       rest' <- rest `forM` \bd -> docSeq
         [ docCommaSep
         , return bd
         ]
-      return $ (sDoc'' Seq.<| x1 Seq.<| rest') Seq.|> eDoc''
+      return $ (sDoc Seq.<| x1 Seq.<| rest') Seq.|> eDoc
diff --git a/src/Language/Haskell/Brittany/Internal/Layouters/Type.hs b/src/Language/Haskell/Brittany/Internal/Layouters/Type.hs
index 2a8f0dd..d50a10c 100644
--- a/src/Language/Haskell/Brittany/Internal/Layouters/Type.hs
+++ b/src/Language/Haskell/Brittany/Internal/Layouters/Type.hs
@@ -407,8 +407,8 @@ layoutType ltype@(L _ typ) = docWrapNode ltype $ case typ of
         ]
     unboxedL = do
       docs <- docSharedWrapper layoutType `mapM` typs
-      let start = docSeq [docLit $ Text.pack "(#", docSeparator]
-          end   = docSeq [docSeparator, docLit $ Text.pack "#)"]
+      let start = docParenHashL
+          end   = docParenHashR
       docAlt
         [ docSeq $ [start]
                ++ List.intersperse docCommaSep docs