refactor(tvix/eval): introduce type to track kind of bindings r/4976

As part of the unification of binding logic between different carriers
of bindings, we need to track which kind of bindings we are dealing
with (attribute set? recursive scope? ...) to correctly emit keys and
declare identifiers in the locals stack.

Right now this changes no functionality as `BindingsKind::Attrs` is
not yet used (only RecAttrs and LetIn, which was previously
represented by the `rec_attrs` boolean).

Change-Id: Id2ac27894079ab584521cb568d75c124f7bf2403
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6771
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI

0 files changed, 0 insertions, 0 deletions