Define a show instance for Bit.

diff --git a/src/Bit.hs b/src/Bit.hs
index 7c1840823b041774774f7d49519ff190f6f52033..d7fb679cfcaf079ebcf349b955d09a5b22da1f30 100644 (file)
--- a/src/Bit.hs
+++ b/src/Bit.hs
@@ -1,8 +1,14 @@
 module Bit where
 
 data Bit = None | Zero | One
-         deriving (Eq, Show)
+         deriving (Eq)
 
+instance Show Bit where
+    show None = "None"
+    show Zero = "0"
+    show One  = "1"
+
+                
 bit_to_int :: Bit -> Int
 bit_to_int None = -1
 bit_to_int Zero =  0