message: Add Hash/Eq to BindingId
  Summary: Used in a subsequent diff, not harmful.
diff: @@ -682,7 +682,7 @@ impl Binding {
  }
  /// If of a binding within current module.
  -#[derive(Copy, Clone, Dupe, Debug)]
  +#[derive(Copy, Clone, Dupe, Debug, Hash, PartialEq, Eq)]
  pub(crate) struct BindingId(usize);
  /// Id of a scope within current module.
  