Test failures should show the block the failure was in

I've been looking through the various extension methods, and it doesn't appear that any of them expose which block contained the failure. For instance, given this test:

def "Test that failure occurs"() {
  given: "i equals zero"
  def i = 0

  when: "i is incremented by 1"
  i++

  then: "i should be equal to 1"
  i == 0
}

There is no way to report that the then block labeled i is equal to 1 was what failed. Since Spock makes the behavior of these blocks somewhat self-explanatory, it would be nice to be able to generate an easy to read report of test failures containing the block names that caused the failure.

There should be a way to retrieve this information. Ideally, this would baked into the ErrorInfo object so IRunListener implementations can get access to it.

Start by tracing the ErrorInfo object and IRunListener extension points to see how test failures are represented and reported. Done means listeners can retrieve the failing Spock block's label, such as the then block in the example, through the failure information.