New Code!
When I fixed up discount to properly block emphasis, I also did some cleanup to prevent memory leaks. Unfortunately, when I fixed up the memory leaks I dropped proper footnote handling on the floor, so code like =[look][]= was not resolving properly. Discount 1.2.2 is a quick cleanup release to fix this defect, with a bugfix and a new testcase, but with (hopefully) nothing else to break anew.