Annotate Module explicitly as @FunctionalInterface.

[copybara-service]

Annotate Module explicitly as @FunctionalInterface.

Module is implicitly a @FunctionalInterface already. That is very convenient, as it allows to express

methodThatTakesAModule(
    new AbstractModule(){
      @Override
      protected void configure() {
        bind(Foo.class).annotatedWith(Bar.class).toInstance(barredFoo);
      }
    }
);

as

methodThatTakesAModule(binder -> binder.bind(Foo.class).annotatedWith(Bar.class).toInstance(barredFoo));

[sameb]

(sorry didn't mean to close this manually)