I want to fix a compiler bug: <https://javap.yawk....

# kontributors

[yawkat]

I want to fix a compiler bug: https://javap.yawk.at/#iSFdOU/procyon - it looks fairly simple to do, is there anything I need to do before submitting a PR?

[ilya.gorbunov]

You should ensure there's a unit test that fails before the change and passes after