Uglify compressor runs infinitely on particular code when sequences=false

[alundeen]

When sequences are turned off with --compress sequences=false, I am unable to uglify this code:

define(["require", "exports"], function (require, exports) {
    var Class = (function () {
        Class.onReady = function (name, callback) {
            if (this.isReady(name)) {
                return callback();
            }
            else {
                (this.callbacks[name] = this.callbacks[name] || []).push(callback);
            }
        };
    })();
});

Example command line, where test.js contains the code above:

# This never completes (it runs for 15+ minutes):
> uglifyjs test.js --mangle --compress sequences=false

# This completes almost instantly
> uglifyjs test.js --mangle --compress

> uglifyjs --version
uglify-js 2.6.0

Similarly, pasting the snippet above into the web demo and unchecking sequences in the compressor options causes Chrome to spike CPU until needing to force-kill the tab.

[mishoo]

It works with the latest code from master. OTOH, the current version on npm is 2.6.1. Please try upgrading, and let me know if it still fails with 2.6.1 so I push out a new version.

[alundeen]

Yes, it does work with 2.6.1. uglifyjs was a sub-dependency so I didn't notice the newer version. Sorry for the spam.

Looks like the problem was covered in #866.