Rollup merge of #122358 - compiler-errors:bound-regions-in-generator, r=lcnr

Don't ICE when encountering bound regions in generator interior type

I'm pretty sure this meant to say "`has_free_regions`", probably just a typo in 4a4fc3bb5b. We can have bound regions (because we only convert non-bound regions into existential regions in generator interiors), but we can't have (non-ReErased) free regions.

r? lcnr

compiler/rustc_trait_selection/src/traits/select/confirmation.rs

@@ -14,7 +14,7 @@ use rustc_infer::infer::{DefineOpaqueTypes, InferOk};
 use rustc_middle::traits::{BuiltinImplSource, SignatureMismatchData};
 use rustc_middle::ty::{
     self, GenericArgs, GenericArgsRef, GenericParamDefKind, ToPolyTraitRef, ToPredicate,
-    TraitPredicate, Ty, TyCtxt, TypeVisitableExt,
+    TraitPredicate, Ty, TyCtxt,
 };
 use rustc_span::def_id::DefId;
 
@@ -1438,10 +1438,8 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
                 }
                 ty::CoroutineWitness(def_id, args) => {
                     let tcx = self.tcx();
-                    stack.extend(tcx.coroutine_hidden_types(def_id).map(|bty| {
-                        let ty = bty.instantiate(tcx, args);
-                        debug_assert!(!ty.has_bound_regions());
-                        ty
+                    stack.extend(tcx.bound_coroutine_hidden_types(def_id).map(|bty| {
+                        self.infcx.enter_forall_and_leak_universe(bty.instantiate(tcx, args))
                     }))
                 }