/// Compactly stores a set of `R0 member of [R1...Rn]` constraints,
/// indexed by the region `R0`.
+#[derive(Debug)]
pub(crate) struct MemberConstraintSet<'tcx, R>
where
R: Copy + Eq,
}
/// Represents a `R0 member of [R1..Rn]` constraint
+#[derive(Debug)]
pub(crate) struct NllMemberConstraint<'tcx> {
next_constraint: Option<NllMemberConstraintIndex>,