I had deleted the binding and created a new one. I naively thought that
the analysis will automatically run again. But now discovered the method
I actually want to use: `scope.moveBindingTo` which moves the binding
and all the correct analysis. The only thing that was left to do is to
update `binding.kind` which I did manually.
When convert a const, let or any other block-bound binding to a var we
forget to update the scope info. This confuses other transforms that may
come after this as to which scope does the binding belongs to.
This also uncovered an issue where duplicate block-scoped bindings were allowed
to co-exist.
