The CHILD HANDLING; PARENT HANDLING tests are haphazard; not
completely covered.  Need to be checked carefully.

Ditto for cause-effect.

(We don't have enough instrumentation types written yet.)


For constant checking, write tests that depend on bytewise equality of
string flavors.  (Currently, we test for (char *) equality only, which
is much weaker.


Null_guard for arrowrefs.
no_deref for arrowrefs.
====================================
