No warning for invalid inherited slot

[cgay]

This should produce a warning like "Invalid inherited slot specification: the foo slot is not inherited from any superclass", but it doesn't.

define class <base> (<object>) end;
define class <sub> (<base>)
  inherited slot foo = bar;
end;

Note that if you're lucky enough, foo will not be otherwise defined and you'll get an undefined binding warning, but if foo is bound you'll get no warning at all.

I noticed this because I accidentally put two inherited slot definitions in the wrong class and got no warning.

[waywardmonkeys]

This should probably be checked in ^check-slot-inheritance in sources/dfmc/conversion/define-class-mop.dylan.