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const fl = require('fantasy-land')

//- Lazy holds a vaue in a thunk, effectively delaying
//- evaluation until required. This is useful when we're
//- in a situation with either very large data set or
//- cyclical data.

//@ make stack-safe.
//> type Lazy a = Unit -> a
function Lazy(run) {

buzzdecafe

// Node.js CheatSheet.
// Download the Node.js source code or a pre-built installer for your platform, and start developing today.
// Download: http://nodejs.org/download/
// More: http://nodejs.org/api/all.html


// 0. Synopsis.
// http://nodejs.org/api/synopsis.html

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(function(global) {

    global.Functor = function(conf) {
        Functor.types[conf.key] = {
            obj: conf.obj,
            fmap: conf.fmap
        };
    };
    
    Functor.types = {};

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function fail(x) { return []; }
function succeed(x) { return [x]; }

function disj(f1, f2) {
  return function(x) {
    return f1(x).concat(f2(x));
  }
}

function conj(f1, f2) {

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function recur(fn) {
    return function () {
        var bounce = fn.apply(this, arguments);
        while (bounce.onTheTrampoline) {
            bounce = bounce();
        }
        return bounce;
    };
}
var sum1 = recur(function sum(x, y) {