Whoops! The TreeTypeAdapter shouldn't be public API.
diff --git a/gson/src/main/java/com/google/gson/TreeTypeAdapter.java b/gson/src/main/java/com/google/gson/TreeTypeAdapter.java
index ea93603..60fdee8 100644
--- a/gson/src/main/java/com/google/gson/TreeTypeAdapter.java
+++ b/gson/src/main/java/com/google/gson/TreeTypeAdapter.java
@@ -30,7 +30,7 @@
* tree adapter may be serialization-only or deserialization-only, this class
* has a facility to lookup a delegate type adapter on demand.
*/
-public final class TreeTypeAdapter<T> extends TypeAdapter<T> {
+final class TreeTypeAdapter<T> extends TypeAdapter<T> {
private final JsonSerializer<T> serializer;
private final JsonDeserializer<T> deserializer;
private final Gson gson;
