anchor.diff:  [source, java]
   ----
   package org.acme.rest.client;
  +
  +import io.smallrye.mutiny.Uni;
   
   import org.eclipse.microprofile.rest.client.ext.ClientHeadersFactory;
   
  
positive.code: ----
  package org.acme.rest.client;
  
  import io.smallrye.mutiny.Uni;
  import org.eclipse.microprofile.rest.client.annotation.ClientHeaderParam;
  import org.eclipse.microprofile.rest.client.annotation.RegisterClientHeaders;
  import org.eclipse.microprofile.rest.client.inject.RegisterRestClient;
  
negative.code: ----
  package org.acme.rest.client;
  
  import io.smallrye.mutiny.Uni;
  import org.eclipse.microprofile.rest.client.inject.RestClient;
  
  import javax.ws.rs.GET;
  import javax.ws.rs.Path;
  import java.util.Set;
  
  @Path("/extension")
  public class ExtensionsResource {
  