Random Integer instance: use Int functions

idontgetoutmuch · Apr 7, 2020 · 274d516 · 274d516
1 parent 49947c3
commit 274d516
Showing 1 changed file with 3 additions and 3 deletions.
diff --git a/System/Random.hs b/System/Random.hs
@@ -706,10 +706,10 @@ buildRandoms cons rand = go
     -- The seq fixes part of #4218 and also makes fused Core simpler.
     go g = x `seq` (x `cons` go g') where (x,g') = rand g
 
-
+-- Generate values in the Int range
 instance Random Integer where
-  random g = randomR (toInteger (minBound::Int), toInteger (maxBound::Int)) g
-  randomM g = uniformR (toInteger (minBound::Int), toInteger (maxBound::Int)) g
+  random = first (toInteger :: Int -> Integer) . random
+  randomM = fmap (toInteger :: Int -> Integer) . randomM
 
 instance UniformRange Integer where
   uniformR = uniformIntegerM