Avoid making Either String an instance of Monad in the Haddock parser

[ghc-hetmet.git] / compiler / parser / HaddockUtils.hs

diff --git a/compiler/parser/HaddockUtils.hs b/compiler/parser/HaddockUtils.hs
index 124d542..abc31e1 100644 (file)
--- a/compiler/parser/HaddockUtils.hs
+++ b/compiler/parser/HaddockUtils.hs
@@ -47,8 +47,8 @@ parseModuleHeader str0 =
          Nothing -> Right Nothing                                                               
          Just description -> case parseHaddockString . tokenise $ description of                       
 
-            Left mess -> Left ("Cannot parse Description: " ++ mess)                            
-            Right doc -> Right (Just doc)                                                       
+            MyLeft mess -> Left ("Cannot parse Description: " ++ mess)                            
+            MyRight doc -> Right (Just doc)                                                       
    in                                                                                           
       case description1 of                                                                      
          Left mess -> Left mess