Was moving (set!) into the (%bind) form, and thus setting the wrong variable.
Now, if set! var is bound, will create a temporary for result of %bind first,
and set! original variable to temporary in the proper scope.
Also, normalize rules for nested (%bind)s:
* The (%bind) inside a (%lambda) is always flat.
- This is a responsiblity of simplify-lambda, and any function which
may change structure after simplification (e.g. promote-to-box).
* Any other (%bind) may be nested, unless otherwise noted.
Jesse D. McDonald
67ea700ac2