adapt code generation

src/allocator.rs

@@ -60,6 +60,9 @@ pub(crate) trait Allocator {
     fn take_bindings(self) -> AllocVarDict;
     fn max_reg_allocated(&self) -> usize;
 
+    // TODO: wha.. why?? grrr. it drains the VarStatus data from vs (which it owns!)
+    // into self.bindings and perm_vs after all is computed (i.e. vs.populate_restricting_sets()
+    // and vs.set_perm_vals(has_deep_cut) have both been called).
     fn drain_var_data<'a>(
         &mut self,
         vs: VariableFixtures<'a>,