regenerator-runtime & ES3

[fan776783]

Mabe replace line 336 delegate.iterator.return to delegate.iterator['return'] in runtime.js for old IE support

[afreidz]

trying to support legacy enterprise applications that use IE8 rendering. this recently started causing errors for us.

[benjamn]

This should be fixed in regenerator-runtime@0.13.1 thanks to #355 by @loganfsmyth, though please note that this version includes the changes from #353, which might require some adjustment if you were previously relying on a global regeneratorRuntime namespace.