Merge pull request #2388 from athanclark/master

some extra packages

build-constraints.yaml

@@ -1601,11 +1601,12 @@ packages:
         - markup
         # - nested-routes # via: HList
         - path-extra
-        # - poly-arity # via HList (sent e-mail to HList maintainer)
+        - poly-arity
         - urlpath
         - wai-transformers
         - wai-middleware-content-type
         - wai-middleware-verbs
+        - websockets-rpc
         - webpage
         - composition-extra
         - rose-trees
@@ -1613,9 +1614,12 @@ packages:
         - timemap
         - triesn
         - path-extra
-        # - pred-trie # via poly-arity
+        - pred-trie
         - pred-set
         - HSet
+        - unit-constraint
+        - unfoldable-restricted
+        - quickcheck-combinators
 
     "Fumiaki Kinoshita <fumiexcel@gmail.com> @fumieval":
         - boundingboxes