Allow escaping bound vars during normalize_erasing_regions in new solver

compiler/rustc_trait_selection/src/solve/mod.rs

@@ -37,7 +37,7 @@ pub use eval_ctxt::{
     EvalCtxt, GenerateProofTree, InferCtxtEvalExt, InferCtxtSelectExt, UseGlobalCache,
 };
 pub use fulfill::FulfillmentCtxt;
-pub(crate) use normalize::deeply_normalize;
+pub(crate) use normalize::{deeply_normalize, deeply_normalize_with_skipped_universes};
 
 #[derive(Debug, Clone, Copy)]
 enum SolverMode {

compiler/rustc_trait_selection/src/solve/normalize.rs

@@ -19,9 +19,19 @@ use super::FulfillmentCtxt;
 pub(crate) fn deeply_normalize<'tcx, T: TypeFoldable<TyCtxt<'tcx>>>(
     at: At<'_, 'tcx>,
     value: T,
+) -> Result<T, Vec<FulfillmentError<'tcx>>> {
+    deeply_normalize_with_skipped_universes(at, value, vec![])
+}
+
+/// Deeply normalize all aliases in `value`. This does not handle inference and expects
+/// its input to be already fully resolved.
+pub(crate) fn deeply_normalize_with_skipped_universes<'tcx, T: TypeFoldable<TyCtxt<'tcx>>>(
+    at: At<'_, 'tcx>,
+    value: T,
+    universes: Vec<Option<UniverseIndex>>,
 ) -> Result<T, Vec<FulfillmentError<'tcx>>> {
     let fulfill_cx = FulfillmentCtxt::new(at.infcx);
-    let mut folder = NormalizationFolder { at, fulfill_cx, depth: 0, universes: Vec::new() };
+    let mut folder = NormalizationFolder { at, fulfill_cx, depth: 0, universes };
 
     value.try_fold_with(&mut folder)
 }