* Remap all instance variables in one pass, to avoid an insidious bug [1].
* Fix another bug by merging promote-shared-variables and narrow-binds [2].
* Don't assume different variable means different value in propogate-set!.
* Add support for (apply), (value-list) and (call-with-values) forms.
* Add support for including files (as if directly substituted) in reader.
* Use scheme/match library to simplify form pattern-matching.
* Refactor (map-form) and (search-form) using a more basic (traverse-form),
which just recurses over the form and returns void by default, and a
new utility function (curry-keywords) to provide default keyword arguments.
[1] Was renaming e.g. %f0 to %i0, then %i0 to %i1, which eliminates the
distinction between %f0 and %i0. Solution is to construct a map from old
names to new names, then traverse the form and change every old variable
to its new equivalent in the map exactly once.
[2] Some variables were not being promoted to boxes, as promotions only occur
at the top-level, when constructing each lambda, and narrow-binds could push
the unpromoted variables down into a subordinate lambda form first. Solution
was to promote variables immediately after narrowing bindings, including the
recursive calls which exist after pushing variables into nested scopes.
Jesse D. McDonald
cbcea20701