Fix a case of comments going missing

data/15-regressions.blt

@@ -1126,3 +1126,14 @@ otherFunc very long patterrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr
  where
   ccccccc = "abc"
   ddddd   = True
+
+#test another comment-case
+getMimeType fp
+  -- ODT
+  | fp == "layout-cache"
+  = Just "application/binary"
+  | "Formula-" `isPrefixOf` fp && "/" `isSuffixOf` fp
+  = Just "application/vnd.oasis.opendocument.formula"
+  -- generic
+  | otherwise
+  = M.lookup (T.toLower $ T.drop 1 $ T.pack $ takeExtension fp) mimeTypes

source/library/Language/Haskell/Brittany/Internal/ToBriDoc/Decl.hs

@@ -154,13 +154,13 @@ layoutBind lbind@(L _ bind) = case bind of
     funcPatDocs <- docHandleComms lbind
       $ matches `forM` layoutPatternBind (Just idStr) binderDoc
     return $ Left $ funcPatDocs
-  PatBind _epAnn pat (GRHSs _ grhss whereBinds) ([], []) -> do -- TODO92 are we ignoring something in whereBinds?
+  PatBind _epAnn pat (GRHSs comms grhss whereBinds) ([], []) -> do -- TODO92 are we ignoring something in whereBinds?
     patDocs <- callLayouter layout_colsWrapPat =<< callLayouter layout_pat pat
     mWhereDocs <- layoutLocalBinds whereBinds
     -- let mWhereArg = mWhereDocs <&> (,) (mkAnnKey lbind) -- TODO: is this the right AnnKey?
     binderDoc <- docLit $ Text.pack "="
     let hasComments = hasAnyCommentsBelow lbind
-    fmap Right $ docHandleComms lbind $ layoutPatternBindFinal
+    fmap Right $ docHandleComms lbind $ docHandleComms comms $ layoutPatternBindFinal
       Nothing
       binderDoc
       (Just patDocs)
@@ -250,7 +250,7 @@ layoutPatternBind
   -> LMatch GhcPs (LHsExpr GhcPs)
   -> ToBriDocM BriDocNumbered
 layoutPatternBind funId binderDoc lmatch@(L _ match) = do
-  let Match epAnn matchCtx pats (GRHSs _ grhss whereBinds) = match
+  let Match epAnn matchCtx pats (GRHSs comms grhss whereBinds) = match
   patDocs <- pats `forM` \p ->
     fmap return $ callLayouter layout_colsWrapPat =<< callLayouter layout_pat p
   let isInfix = isInfixMatch match
@@ -296,7 +296,7 @@ layoutPatternBind funId binderDoc lmatch@(L _ match) = do
   -- let mWhereArg = mWhereDocs <&> (,) (mkAnnKey lmatch)
   let alignmentToken = if null pats then Nothing else funId
   let hasComments = hasAnyCommentsBelow lmatch
-  docHandleComms lmatch $ docHandleComms epAnn $ docFlushCommsPost True matchEndLoc
+  docHandleComms lmatch $ docHandleComms epAnn $ docHandleComms comms $ docFlushCommsPost True matchEndLoc
     $ layoutPatternBindFinal
       alignmentToken
       binderDoc

source/library/Language/Haskell/Brittany/Internal/ToBriDocTools.hs

@@ -518,6 +518,21 @@ instance DocHandleComms [LEpaComment] (ToBriDocM BriDocNumbered) where
     i1 <- allocNodeIndex
     pure (i1, BDQueueComments comms bd)
 
+instance DocHandleComms EpAnnComments (ToBriDocM BriDocNumbered) where
+  docHandleComms (EpaComments comms) bdm = do
+    bd <- bdm
+    i1 <- allocNodeIndex
+    pure (i1, BDQueueComments comms bd)
+  docHandleComms (EpaCommentsBalanced commsB commsA) bdm = do
+    bd <- bdm
+    i1 <- allocNodeIndex
+    pure
+      ( i1
+      , BDQueueComments
+          (commsB ++ commsA)
+          bd
+      )
+
 instance DocHandleComms (EpAnn a) (ToBriDocM BriDocNumbered) where
   docHandleComms epAnn bdm = case epAnn of
     EpAnn anch _ (EpaComments []) -> do