Want to help? Want something that (hopefully) doesn't require deep guts skillz? Take a task from this list. Delete it from here when you commit; maybe announce on #perl6 that you're working on it too.
Note - do not just copy stuff from the master setting! Often things need to be done differently in the "nom" branch, to take advantage of new possible performance.
See S03-smartmatch tests, especially array-array.t, hash-hash.t and so forth. The regex ones are probably also good candidates now.
my Int $b = 3; $b = Nil;