are now implemented as closures (because
they're structure slot accessors) won't be so
nasty in the debugger
+ ** %SLOT-ACCESSOR/%SLOT-ACCESSOR stuff can probably go away,
+ since we inline expand all slot accessors into
+ %INSTANCE-REF and the optimizer knows all it needs
+ to know about that.
* rewrote long-standing confusing error restarts for redefining
DEFSTRUCTs
* outstanding embarrassments