X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Futils%2FFastString.lhs;h=8fcd419a2a8fa883065503f9a6aac253e16aa06d;hb=fd8a24fdce1ff65c4d8f89955b8dd0dc4511ccc8;hp=055f921213faef0428df5f2732e0b126bb5f9425;hpb=789690fc23a49aa3bcbc946992fd6340c90d8c10;p=ghc-hetmet.git

diff --git a/compiler/utils/FastString.lhs b/compiler/utils/FastString.lhs
index 055f921..8fcd419 100644
--- a/compiler/utils/FastString.lhs
+++ b/compiler/utils/FastString.lhs
@@ -93,12 +93,14 @@ import Encoding
 import FastTypes
 import FastFunctions
 import Panic
+import Util
 
 import Foreign
 import Foreign.C
 import GHC.Exts
 import System.IO
 import System.IO.Unsafe ( unsafePerformIO )
+import Data.Data
 import Data.IORef       ( IORef, newIORef, readIORef, writeIORef )
 import Data.Maybe       ( isJust )
 import Data.Char        ( ord )
@@ -133,7 +135,7 @@ data FastString = FastString {
       n_chars :: {-# UNPACK #-} !Int, -- number of chars
       buf     :: {-# UNPACK #-} !(ForeignPtr Word8),
       enc     :: FSEncoding
-  }
+  } deriving Typeable
 
 data FSEncoding
     -- including strings that don't need any encoding
@@ -159,6 +161,12 @@ instance Ord FastString where
 instance Show FastString where
    show fs = show (unpackFS fs)
 
+instance Data FastString where
+  -- don't traverse?
+  toConstr _   = abstractConstr "FastString"
+  gunfold _ _  = error "gunfold"
+  dataTypeOf _ = mkNoRepType "FastString"
+
 cmpFS :: FastString -> FastString -> Ordering
 cmpFS (FastString u1 l1 _ buf1 _) (FastString u2 l2 _ buf2 _) =
   if u1 == u2 then EQ else