Was just checking the Undeclared dictionary in 3.7beta before going
gamma...

Doing 'Undeclared removeUnreferencedKeys; inspect' shows one undeclared
variable: #cards.  After searching for the reference to this (by brute
force/'method source with it', is there an easier way?), it looks like
it's in SMSqueakMap>>deleteCard:, which refers to the nonexistent
variable #cards.

So, it'd be nice to clean this up.  It might be easiest to fix it the
3.7beta update stream, and then also fix it in the next release of
SqueakMap. (as long as we don't forget to fix it in the SM release)

- Doug