code: private void tryReplaceSuper(Node superNode) {
      checkState(!superclasses.isEmpty(), "`super` cannot appear outside a function");
      Optional<Node> currentSuperclass = superclasses.peek();
      if (!currentSuperclass.isPresent() || !currentSuperclass.get().isQualifiedName()) {
        // either if a) we're in a static class fn without an 'extends' clause or b) we're not in
        // a static class function
        return;
      }
  
      Node fullyQualifiedSuperRef = currentSuperclass.get().cloneTree();
      superNode.replaceWith(fullyQualifiedSuperRef);
      compiler.reportChangeToEnclosingScope(fullyQualifiedSuperRef);
    }
docs: Replaces `super` with `Super.Class` if in a static class method with a qname superclass