diff --git a/.gitignore b/.gitignore
index b1283a7..9ae5a45 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,5 @@
 target/
 .mooncakes/
+_build/
+target
+_build
diff --git a/combinator_test.mbt b/combinator_test.mbt
index cc82932..3c1558e 100644
--- a/combinator_test.mbt
+++ b/combinator_test.mbt
@@ -60,7 +60,7 @@ test "json" {
       "obj3": { "a": true, "b": true },
       "obj4": { "a": true, "b": true },
     },
-    "key3": [true, false, Null],
+    "key3": [true, false, Json::null()],
   }
   inspect(
     @prettyprinter.render(json),
diff --git a/pkg.generated.mbti b/pkg.generated.mbti
index 5d32ec8..6ba53e0 100644
--- a/pkg.generated.mbti
+++ b/pkg.generated.mbti
@@ -122,8 +122,8 @@ pub impl Pretty for Bytes
 pub impl Pretty for @bigint.BigInt
 pub impl Pretty for @buffer.Buffer
 pub impl[A : Pretty] Pretty for Array[A]
-pub impl[A : Pretty] Pretty for Iter[A]
-pub impl[A : Pretty, B : Pretty] Pretty for Iter2[A, B]
+pub impl[A : Pretty] Pretty for Iterator[A]
+pub impl[A : Pretty, B : Pretty] Pretty for Iterator2[A, B]
 pub impl Pretty for Json
 pub impl[A : Pretty, B : Pretty] Pretty for Map[A, B]
 pub impl[A : Pretty] Pretty for @deque.Deque[A]
diff --git a/pretty.mbt b/pretty.mbt
index 8f54b82..65fb8d8 100644
--- a/pretty.mbt
+++ b/pretty.mbt
@@ -483,13 +483,13 @@ pub impl[A : Pretty] Pretty for @immut/array.T[A] with pretty(array) {
 }
 
 ///|
-pub impl[A : Pretty] Pretty for Iter[A] with pretty(self) {
+pub impl[A : Pretty] Pretty for Iterator[A] with pretty(self) {
   self.to_array() |> pretty()
 }
 
 ///|
-pub impl[A : Pretty, B : Pretty] Pretty for Iter2[A, B] with pretty(self) {
-  self.to_array() |> pretty()
+pub impl[A : Pretty, B : Pretty] Pretty for Iterator2[A, B] with pretty(self) {
+  self.iterator().to_array() |> pretty()
 }
 
 ///|