[list-ops] Make foldl' call unambiguous.

exercises/practice/list-ops/.meta/examples/success-standard/src/ListOps.hs

@@ -10,7 +10,7 @@ module ListOps
   ) where
 
 import Prelude hiding
-  ( length, reverse, map, filter, foldr, (++), concat )
+  ( length, reverse, map, filter, foldl', foldr, (++), concat )
 
 foldl' :: (b -> a -> b) -> b -> [a] -> b
 foldl' f = go

exercises/practice/list-ops/src/ListOps.hs

@@ -10,7 +10,7 @@ module ListOps
   ) where
 
 import Prelude hiding
-  ( length, reverse, map, filter, foldr, (++), concat )
+  ( length, reverse, map, filter, foldl', foldr, (++), concat )
 
 foldl' :: (b -> a -> b) -> b -> [a] -> b
 foldl' f z xs = error "You need to implement this function."

exercises/practice/list-ops/test/Tests.hs

@@ -8,6 +8,7 @@ import Prelude hiding
     ( (++)
     , concat
     , filter
+    , foldl'
     , foldr
     , length
     , map