(function() {
'use strict';

ElmRuntime.counter = 0;
ElmRuntime.guid = function() { return ElmRuntime.counter++; }

ElmRuntime.use = function(M) {
    if (typeof M === 'function') M = M();
    return M;
};

function isAlive(input) {
    if (!('defaultNumberOfKids' in input)) return true;
    var len = input.kids.length;
    if (len == 0) return false;
    if (len > input.defaultNumberOfKids) return true;
    var alive = false;
    for (var i = len; i--; ) {
	alive = alive || isAlive(input.kids[i]);
    }
    return alive;
}

ElmRuntime.filterDeadInputs = function(inputs) {
    var temp = [];
    for (var i = inputs.length; i--; ) {
	if (isAlive(inputs[i])) temp.push(inputs[i]);
    }
    return temp;
};

}());