The exercise recycling-robot on the JavaScript track was recently updated and this included a change to lib.js, which is marked as a read-only editor file.
It did show up in the What’s new dialog, but it was not updated:
The bug is likely because Exercise will exclude “files you previously submitted”. This is absolutely a mistake for editor / read-only files. All current solutions are broken because of this.
The workaround is to copy your solution, revert the exercise and then paste your solution.
