SysCmd: older base does not export Foldable

(ghc-7.8 and earlier) https://www.haskell.org/platform/contents.html
juhp · Mar 13, 2017 · 7d1c538 · 7d1c538
1 parent f156951
commit 7d1c538
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/src/SysCmd.hs b/src/SysCmd.hs
@@ -162,5 +162,9 @@ s +-+ t | last s == ' ' = s ++ t
         | head t == ' ' = s ++ t
 s +-+ t = s ++ " " ++ t
 
+#if (defined(MIN_VERSION_base) && MIN_VERSION_base(4,8,2))
 notNull :: Foldable t => t a -> Bool
+#else
+notNull :: [a] -> Bool
+#endif
 notNull = not . null