lambda being compiled to empty method

Thank you for all your awesome work on GWT.

I'm getting a lambda being compiled to an empty method. As the method is empty, it returns null, and the caller gets a null dereference. I'm using the latest HEAD from gwt github. 

The lambda is the following (the whole class is at https://github.com/Peergos/Peergos/blob/google/src/peergos/shared/corenode/HTTPCoreNode.java   -  the getUsername method)

res -> {

                System.out.println("HttpCoreNode.getUsername2");

                DataInputStream din = new DataInputStream(new ByteArrayInputStream(res));

                try {

                    String username = Serialize.deserializeString(din, CoreNode.MAX_USERNAME_SIZE);

                    return username;

                } catch (IOException e) {

                    throw new RuntimeException(e);

                }

            }

This is being compiled to this empty function:

var com_google_gwt_lang_ClassLiteralHolder_Lpeergos_1shared_1corenode_1HTTPCoreNode$lambda$0$Type_12_1classLit = java_lang_Class_createForClass__Ljava_lang_String_2Ljava_lang_String_2Lcom_google_gwt_core_client_JavaScriptObject_2Ljava_lang_Class_2Ljava_lang_Class_2($intern_74, 'HTTPCoreNode/lambda$0$Type', 268);

function peergos_shared_corenode_HTTPCoreNode$lambda$1$Type_HTTPCoreNode$lambda$1$Type__V(){

}

Am I doing something wrong? Any help very much appreciated. 

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