only Show instance for Boolean.

sebfisch · Jan 30, 2009 · 7081ac4 · 7081ac4
1 parent 2cbc08b
commit 7081ac4
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/Data/Boolean.hs b/Data/Boolean.hs
@@ -40,6 +40,7 @@ data Boolean
   | Boolean :&&: Boolean
   -- | and disjunction of boolean formulas.
   | Boolean :||: Boolean
+ deriving Show
 
 -- | Literals are variables that occur either positively or negatively.
 --