How to return a function in scala

Question

How can I return a function side-effecting lexical closure¹ in Scala?

For instance, I was looking at this code sample in Go:

Answer 1

Got it!! after some trial and error:

def fib() : () => Int = {
    var a = 0
    var b = 1
    return (()=>{ 
        val t = a;
        a = b
        b = t + b
        b
    })
}

Testing:

val f = fib()
println(f(),f(),f(),f())

1 2 3 5 8