abstract class CustomScriptBodyMethod extends Script {
    abstract def runScript()
    def preRun() {
        println "preRunning"
    }
    def postRun() {
        println "postRunning"
    }
    def run() {
        preRun()
        try {
            3.times { runScript() }
        } finally {
            postRun()
        }
    }
}

@BaseScript CustomScriptBodyMethod baseScript
println "Script body run"

hovering mouse over println does not show pop up hoverhelp
and
postRun is not available as an auto complete in the script