A method or accessor with empty body is implicitly abstract.

dart/lib/compiler/implementation/scanner/listener.dart

Index: dart/lib/compiler/implementation/scanner/listener.dart
diff --git a/dart/lib/compiler/implementation/scanner/listener.dart b/dart/lib/compiler/implementation/scanner/listener.dart
index c5297c9ba97ac64735932dc74862ad754b74a3f8..ae3453b7986bf1095902d3ae0a50fcf8c2f1d4ca 100644
--- a/dart/lib/compiler/implementation/scanner/listener.dart
+++ b/dart/lib/compiler/implementation/scanner/listener.dart
@@ -1387,7 +1387,11 @@ class NodeListener extends ElementListener {
   }
 
   void endFunctionBody(int count, Token beginToken, Token endToken) {
-    pushNode(new Block(makeNodeList(count, beginToken, endToken, null)));
+    if (count == 0 && beginToken == null) {
+      pushNode(new EmptyStatement(endToken));
+    } else {
+      pushNode(new Block(makeNodeList(count, beginToken, endToken, null)));
+    }
   }
 
   void handleNoFunctionBody(Token token) {