Groovy supports true closures

closure.groovy

def makeClos() {
    def x = 0;
    def close = { x += 1; println(x) }
    close
}

def closA = makeClos()
def closB = makeClos()

closA()  // prints 1
closA()  // prints 2
closA()  // prints 3

closB()  // prints 1
closB()  // prints 2

closA()  // prints 4