How to create "Mandatory" spock extension

Question

I am using Spock in combination with Geb for web browser testing.

I have created the "stepThrough" extension by following the instructions found here:

Spock Stepwise - Keep running testsuite after single failure

That works all fine and well, but I would like to make a new annotation. That sets a a geb feature method to "Mandatory" meaning that if this feature method fails I would like to stop execution of the rest of the test.

I like the stepThrough annotation because if one test case fails I can continue with the rest of my testing, but if something like login fails, then I would want to stop the testing because obviously nothing else would work if Login fails.

This is what I have so Far but it does not seem to be working. Where have I gone wrong?

Here is the Annotation class import org.spockframework.runtime.extension.ExtensionAnnotation

import java.lang.annotation.ElementType
import java.lang.annotation.Retention
import java.lang.annotation.RetentionPolicy
import java.lang.annotation.Target



@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@ExtensionAnnotation(ManditoryExtension.class)
@interface Manditory {}

Here is the extension:

class ManditoryExtension extends AbstractAnnotationDrivenExtension<Manditory>{

    void visitFeatureAnnotation(Manditory annotation, FeatureInfo feature) {
        skipFeaturesAfterFirstFailingFeature(feature)
    }

    private void skipFeaturesAfterFirstFailingFeature(final FeatureInfo feature){
        feature.getParent().getBottomSpec().addListener(new AbstractRunListener() {
            void error(ErrorInfo error) {

                if (!error.getMethod().equals(feature)) return


                for (FeatureInfo feat : feature.getSpec().getFeatures())
                    feat.setSkipped(true)
            }
        })
    }


}