Check for overlap-flag differences in hi files

[ghc-hetmet.git] / compiler / types / InstEnv.lhs

diff --git a/compiler/types/InstEnv.lhs b/compiler/types/InstEnv.lhs
index d4a7b77..70e6166 100644 (file)
--- a/compiler/types/InstEnv.lhs
+++ b/compiler/types/InstEnv.lhs
@@ -108,7 +108,7 @@ data Instance
 --             This is used for versioning; the instance decl is
 --             considered part of the defn of n when computing versions
 --
---    Nothing  The head mentions nothing defined in this modle
+--    Nothing  The head mentions nothing defined in this module
 --
 -- If a module contains any orphans, then its interface file is read 
 -- regardless, so that its instances are not missed. 
@@ -240,6 +240,7 @@ data OverlapFlag
                -- Without the Incoherent flag, we'd complain that
                -- instantiating 'b' would change which instance 
                -- was chosen
+  deriving( Eq )
 
 instance Outputable OverlapFlag where
    ppr NoOverlap  = empty