Bug 884201 - Macros should have strict arity rules
(No bug) Update tools/perf/example.lol with a few plurals
Bug 884734 - Missing attributes should fail gracefully
Bug 886082 - Add statistical testing to make perf

Run `make reference` followed by `make perf`.  See tools/perf/README for more
instructions.
Bug 884229 - Detect cyclic references in indexes