Add a test for subscript assignment
Add a test for subscript assignment

paultag/hy,farhaven/hy,tianon/hy,ALSchwalm/hy,kirbyfan64/hy,algernon/hy,Foxboron/hy,mtmiller/hy,tuturto/hy,farhaven/hy,jakirkham/hy,timmartin/hy,farhaven/hy,adamfeuer/hy,larme/hy,larme/hy,hcarvalhoalves/hy,tianon/hy,michel-slm/hy,Foxboron/hy,Tritlo/hy,aisk/hy,aisk/hy,zackmdavis/hy,gilch/hy,hcarvalhoalves/hy,freezas/hy,larme/hy,aisk/hy,kartikm/hy,kirbyfan64/hy,tianon/hy