Libraries cannot source themselves anymore.

client/fling/src/java/core/com/google/dart/LibraryFromSources.java

Index: client/fling/src/java/core/com/google/dart/LibraryFromSources.java
diff --git a/client/fling/src/java/core/com/google/dart/LibraryFromSources.java b/client/fling/src/java/core/com/google/dart/LibraryFromSources.java
index 5d029c8f1dcd5a9cf87beaac4224d3da049e66e7..6ff41142f281415af68e9113f8a61708dbdbb7ad 100644
--- a/client/fling/src/java/core/com/google/dart/LibraryFromSources.java
+++ b/client/fling/src/java/core/com/google/dart/LibraryFromSources.java
@@ -28,7 +28,6 @@ public class LibraryFromSources implements LibrarySource, DartSource {
     for (LibrarySource lib : libs) {
       this.libs.put(lib.getName(), lib);
     }
-    sources.put(name, this);
   }
 
   public void addNative(DartSource source) {
@@ -61,6 +60,10 @@ public class LibraryFromSources implements LibrarySource, DartSource {
 
   @Override
   public DartSource getSourceFor(String path) {
+    if (name.equals(path)) {
+      return this;
+    }
+
     final DartSource source = sources.get(path);
     if (source != null) {
       return source;