// -*- mode: js2 -*-
// Line numbers in this file are checked in Debugger-findScripts-11.js.

// line 3

var x = "";
function f() {
    x += "the map";                             // line 8
    return function g() {
        return "to me what you have stolen";    // line 10
    };
}

function h(x, y) {
    if (x == 0) return y+1;                     // line 15
    if (y == 0) return h(x-1, 1);
    return h(x-1, h(x, y-1));
}
