PollingConditions.eventually should work also if defined with def

Hi, in the below's example I've provided two tests:
first is going to pass, second is going to fail

The only difference is the way of creating PollingConditions object

class Playground extends Specification {

    def "not boom"() {
        given:
        def conditions = new PollingConditions()

        when:
        def x = 10

        then:
        conditions.eventually {
            1 == 2
        }
    }

    def "boom 2"() {
        given:
        PollingConditions conditions = new PollingConditions()

        when:
        def x = 10

        then:
        conditions.eventually {
            1 == 2
        }
    }
}

Is it expected behavior? There is nothing about it in the documentation of @ConditionBlock, which I strongly believe is related to that (we don't need to write assert keyword in the clojure).

If it's related to groovy itself it might be a good idea to fail when such usage is detected.

Start by reproducing the two examples using PollingConditions and compare how @ConditionBlock handles the def-created and explicitly typed variables. Read the PollingConditions and @ConditionBlock entry points, then determine the expected behavior and capture it with a regression test; the issue is done when the behavior is corrected or clearly documented, including any invalid usage.