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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