Put param_env into infcx.

Because they get passed around together a lot.

compiler/rustc_borrowck/src/diagnostics/bound_region_errors.rs

@@ -60,7 +60,7 @@ impl<'tcx> UniverseInfo<'tcx> {
             UniverseInfo::RelateTys { expected, found } => {
                 let err = mbcx.infcx.err_ctxt().report_mismatched_types(
                     &cause,
-                    mbcx.param_env,
+                    mbcx.infcx.param_env,
                     expected,
                     found,
                     TypeError::RegionsPlaceholderMismatch,

compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs

@@ -266,7 +266,7 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
                 }
             }
 
-            if self.param_env.caller_bounds().iter().any(|c| {
+            if self.infcx.param_env.caller_bounds().iter().any(|c| {
                 c.as_trait_clause().is_some_and(|pred| {
                     pred.skip_binder().self_ty() == ty && self.infcx.tcx.is_fn_trait(pred.def_id())
                 })
@@ -682,13 +682,13 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
                 // Normalize before comparing to see through type aliases and projections.
                 let old_ty = ty::EarlyBinder::bind(ty).instantiate(tcx, generic_args);
                 let new_ty = ty::EarlyBinder::bind(ty).instantiate(tcx, new_args);
-                if let Ok(old_ty) =
+                if let Ok(old_ty) = tcx.try_normalize_erasing_regions(
-                    tcx.try_normalize_erasing_regions(self.infcx.typing_env(self.param_env), old_ty)
+                    self.infcx.typing_env(self.infcx.param_env),
-                    && let Ok(new_ty) = tcx.try_normalize_erasing_regions(
+                    old_ty,
-                        self.infcx.typing_env(self.param_env),
+                ) && let Ok(new_ty) = tcx.try_normalize_erasing_regions(
-                        new_ty,
+                    self.infcx.typing_env(self.infcx.param_env),
-                    )
+                    new_ty,
-                {
+                ) {
                     old_ty == new_ty
                 } else {
                     false
@@ -707,15 +707,16 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
             // Test the callee's predicates, substituting in `ref_ty` for the moved argument type.
             clauses.instantiate(tcx, new_args).predicates.iter().all(|&(mut clause)| {
                 // Normalize before testing to see through type aliases and projections.
-                if let Ok(normalized) =
+                if let Ok(normalized) = tcx.try_normalize_erasing_regions(
-                    tcx.try_normalize_erasing_regions(self.infcx.typing_env(self.param_env), clause)
+                    self.infcx.typing_env(self.infcx.param_env),
-                {
+                    clause,
+                ) {
                     clause = normalized;
                 }
                 self.infcx.predicate_must_hold_modulo_regions(&Obligation::new(
                     tcx,
                     ObligationCause::dummy(),
-                    self.param_env,
+                    self.infcx.param_env,
                     clause,
                 ))
             })
@@ -904,7 +905,7 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
         let ty = moved_place.ty(self.body, self.infcx.tcx).ty;
         debug!("ty: {:?}, kind: {:?}", ty, ty.kind());
 
-        let Some(assign_value) = self.infcx.err_ctxt().ty_kind_suggestion(self.param_env, ty)
+        let Some(assign_value) = self.infcx.err_ctxt().ty_kind_suggestion(self.infcx.param_env, ty)
         else {
             return;
         };
@@ -1304,7 +1305,7 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
     pub(crate) fn implements_clone(&self, ty: Ty<'tcx>) -> bool {
         let Some(clone_trait_def) = self.infcx.tcx.lang_items().clone_trait() else { return false };
         self.infcx
-            .type_implements_trait(clone_trait_def, [ty], self.param_env)
+            .type_implements_trait(clone_trait_def, [ty], self.infcx.param_env)
             .must_apply_modulo_regions()
     }
 
@@ -1437,7 +1438,7 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
         let ocx = ObligationCtxt::new_with_diagnostics(self.infcx);
         let cause = ObligationCause::misc(span, self.mir_def_id());
 
-        ocx.register_bound(cause, self.param_env, ty, def_id);
+        ocx.register_bound(cause, self.infcx.param_env, ty, def_id);
         let errors = ocx.select_all_or_error();
 
         // Only emit suggestion if all required predicates are on generic
@@ -1957,7 +1958,8 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
                 && let ty::Ref(_, inner, _) = rcvr_ty.kind()
                 && let inner = inner.peel_refs()
                 && (Holds { ty: inner }).visit_ty(local_ty).is_break()
-                && let None = self.infcx.type_implements_trait_shallow(clone, inner, self.param_env)
+                && let None =
+                    self.infcx.type_implements_trait_shallow(clone, inner, self.infcx.param_env)
             {
                 err.span_label(
                     span,
@@ -1989,7 +1991,7 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
             let obligation = Obligation::new(
                 self.infcx.tcx,
                 ObligationCause::dummy(),
-                self.param_env,
+                self.infcx.param_env,
                 trait_ref,
             );
             self.infcx.err_ctxt().suggest_derive(
@@ -3398,7 +3400,7 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
             if let Some(iter_trait) = tcx.get_diagnostic_item(sym::Iterator)
                 && self
                     .infcx
-                    .type_implements_trait(iter_trait, [return_ty], self.param_env)
+                    .type_implements_trait(iter_trait, [return_ty], self.infcx.param_env)
                     .must_apply_modulo_regions()
             {
                 err.span_suggestion_hidden(
@@ -3839,14 +3841,15 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
                     tcx.get_diagnostic_item(sym::deref_target).and_then(|deref_target| {
                         Instance::try_resolve(
                             tcx,
-                            self.infcx.typing_env(self.param_env),
+                            self.infcx.typing_env(self.infcx.param_env),
                             deref_target,
                             method_args,
                         )
                         .transpose()
                     });
                 if let Some(Ok(instance)) = deref_target {
-                    let deref_target_ty = instance.ty(tcx, self.infcx.typing_env(self.param_env));
+                    let deref_target_ty =
+                        instance.ty(tcx, self.infcx.typing_env(self.infcx.param_env));
                     err.note(format!("borrow occurs due to deref coercion to `{deref_target_ty}`"));
                     err.span_note(tcx.def_span(instance.def_id()), "deref defined here");
                 }

compiler/rustc_borrowck/src/diagnostics/mod.rs

@@ -864,7 +864,7 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
 
             let kind = call_kind(
                 self.infcx.tcx,
-                self.infcx.typing_env(self.param_env),
+                self.infcx.typing_env(self.infcx.param_env),
                 method_did,
                 method_args,
                 *fn_span,
@@ -1160,7 +1160,7 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
                         let suggest = match tcx.get_diagnostic_item(sym::IntoIterator) {
                             Some(def_id) => type_known_to_meet_bound_modulo_regions(
                                 self.infcx,
-                                self.param_env,
+                                self.infcx.param_env,
                                 Ty::new_imm_ref(tcx, tcx.lifetimes.re_erased, ty),
                                 def_id,
                             ),
@@ -1224,7 +1224,7 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
                                 BoundRegionConversionTime::FnCall,
                                 tcx.fn_sig(method_did).instantiate(tcx, method_args).input(0),
                             )
-                            && self.infcx.can_eq(self.param_env, ty, self_ty)
+                            && self.infcx.can_eq(self.infcx.param_env, ty, self_ty)
                         {
                             err.subdiagnostic(CaptureReasonSuggest::FreshReborrow {
                                 span: move_span.shrink_to_hi(),
@@ -1258,7 +1258,7 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
                             if let Some(errors) = self.infcx.type_implements_trait_shallow(
                                 clone_trait,
                                 ty,
-                                self.param_env,
+                                self.infcx.param_env,
                             ) && !has_sugg
                             {
                                 let msg = match &errors[..] {

compiler/rustc_borrowck/src/diagnostics/move_errors.rs

@@ -305,7 +305,7 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
         let Some(copy_trait_def) = self.infcx.tcx.lang_items().copy_trait() else { return false };
         // This is only going to be ambiguous if there are incoherent impls, because otherwise
         // ambiguity should never happen in MIR.
-        self.infcx.type_implements_trait(copy_trait_def, [ty], self.param_env).may_apply()
+        self.infcx.type_implements_trait(copy_trait_def, [ty], self.infcx.param_env).may_apply()
     }
 
     fn report_cannot_move_from_static(&mut self, place: Place<'tcx>, span: Span) -> Diag<'infcx> {

compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs

@@ -1242,7 +1242,7 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
                             .type_implements_trait_shallow(
                                 clone_trait,
                                 ty.peel_refs(),
-                                self.param_env,
+                                self.infcx.param_env,
                             )
                             .as_deref()
                         {
@@ -1279,7 +1279,7 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
                                 let obligation = traits::Obligation::new(
                                     self.infcx.tcx,
                                     traits::ObligationCause::dummy(),
-                                    self.param_env,
+                                    self.infcx.param_env,
                                     trait_ref,
                                 );
                                 self.infcx.err_ctxt().suggest_derive(

compiler/rustc_borrowck/src/diagnostics/region_errors.rs

@@ -952,7 +952,7 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
 
             if let Ok(Some(instance)) = ty::Instance::try_resolve(
                 tcx,
-                self.infcx.typing_env(self.param_env),
+                self.infcx.typing_env(self.infcx.param_env),
                 *fn_did,
                 self.infcx.resolve_vars_if_possible(args),
             ) {
@@ -1091,7 +1091,7 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
             peeled_ty = ref_ty;
             count += 1;
         }
-        if !self.infcx.type_is_copy_modulo_regions(self.param_env, peeled_ty) {
+        if !self.infcx.type_is_copy_modulo_regions(self.infcx.param_env, peeled_ty) {
             return;
         }
 
@@ -1160,7 +1160,7 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
         let ocx = ObligationCtxt::new(&self.infcx);
         ocx.register_obligations(preds.iter().map(|(pred, span)| {
             trace!(?pred);
-            Obligation::misc(tcx, span, self.mir_def_id(), self.param_env, pred)
+            Obligation::misc(tcx, span, self.mir_def_id(), self.infcx.param_env, pred)
         }));
 
         if ocx.select_all_or_error().is_empty() && count > 0 {

compiler/rustc_borrowck/src/lib.rs

@@ -140,7 +140,6 @@ fn do_mir_borrowck<'tcx>(
 ) -> (BorrowCheckResult<'tcx>, Option<Box<BodyWithBorrowckFacts<'tcx>>>) {
     let def = input_body.source.def_id().expect_local();
     let infcx = BorrowckInferCtxt::new(tcx, def);
-    let param_env = tcx.param_env(def);
 
     let mut local_names = IndexVec::from_elem(None, &input_body.local_decls);
     for var_debug_info in &input_body.var_debug_info {
@@ -175,8 +174,7 @@ fn do_mir_borrowck<'tcx>(
     // will have a lifetime tied to the inference context.
     let mut body_owned = input_body.clone();
     let mut promoted = input_promoted.to_owned();
-    let free_regions =
+    let free_regions = nll::replace_regions_in_mir(&infcx, &mut body_owned, &mut promoted);
-        nll::replace_regions_in_mir(&infcx, param_env, &mut body_owned, &mut promoted);
     let body = &body_owned; // no further changes
 
     // FIXME(-Znext-solver): A bit dubious that we're only registering
@@ -213,7 +211,6 @@ fn do_mir_borrowck<'tcx>(
         body,
         &promoted,
         &location_table,
-        param_env,
         &mut flow_inits,
         &move_data,
         &borrow_set,
@@ -250,7 +247,6 @@ fn do_mir_borrowck<'tcx>(
         let promoted_body = &promoted[idx];
         let mut promoted_mbcx = MirBorrowckCtxt {
             infcx: &infcx,
-            param_env,
             body: promoted_body,
             move_data: &move_data,
             location_table: &location_table, // no need to create a real one for the promoted, it is not used
@@ -290,7 +286,6 @@ fn do_mir_borrowck<'tcx>(
 
     let mut mbcx = MirBorrowckCtxt {
         infcx: &infcx,
-        param_env,
         body,
         move_data: &move_data,
         location_table: &location_table,
@@ -447,12 +442,14 @@ fn get_flow_results<'a, 'tcx>(
 pub(crate) struct BorrowckInferCtxt<'tcx> {
     pub(crate) infcx: InferCtxt<'tcx>,
     pub(crate) reg_var_to_origin: RefCell<FxIndexMap<ty::RegionVid, RegionCtxt>>,
+    pub(crate) param_env: ParamEnv<'tcx>,
 }
 
 impl<'tcx> BorrowckInferCtxt<'tcx> {
     pub(crate) fn new(tcx: TyCtxt<'tcx>, def_id: LocalDefId) -> Self {
         let infcx = tcx.infer_ctxt().build(TypingMode::analysis_in_body(tcx, def_id));
-        BorrowckInferCtxt { infcx, reg_var_to_origin: RefCell::new(Default::default()) }
+        let param_env = tcx.param_env(def_id);
+        BorrowckInferCtxt { infcx, reg_var_to_origin: RefCell::new(Default::default()), param_env }
     }
 
     pub(crate) fn next_region_var<F>(
@@ -531,7 +528,6 @@ impl<'tcx> Deref for BorrowckInferCtxt<'tcx> {
 
 struct MirBorrowckCtxt<'a, 'infcx, 'tcx> {
     infcx: &'infcx BorrowckInferCtxt<'tcx>,
-    param_env: ParamEnv<'tcx>,
     body: &'a Body<'tcx>,
     move_data: &'a MoveData<'tcx>,
 

compiler/rustc_borrowck/src/nll.rs

@@ -50,10 +50,9 @@ pub(crate) struct NllOutput<'tcx> {
 /// Rewrites the regions in the MIR to use NLL variables, also scraping out the set of universal
 /// regions (e.g., region parameters) declared on the function. That set will need to be given to
 /// `compute_regions`.
-#[instrument(skip(infcx, param_env, body, promoted), level = "debug")]
+#[instrument(skip(infcx, body, promoted), level = "debug")]
 pub(crate) fn replace_regions_in_mir<'tcx>(
     infcx: &BorrowckInferCtxt<'tcx>,
-    param_env: ty::ParamEnv<'tcx>,
     body: &mut Body<'tcx>,
     promoted: &mut IndexSlice<Promoted, Body<'tcx>>,
 ) -> UniversalRegions<'tcx> {
@@ -62,7 +61,7 @@ pub(crate) fn replace_regions_in_mir<'tcx>(
     debug!(?def);
 
     // Compute named region information. This also renumbers the inputs/outputs.
-    let universal_regions = UniversalRegions::new(infcx, def, param_env);
+    let universal_regions = UniversalRegions::new(infcx, def);
 
     // Replace all remaining regions with fresh inference variables.
     renumber::renumber_mir(infcx, body, promoted);
@@ -81,7 +80,6 @@ pub(crate) fn compute_regions<'a, 'tcx>(
     body: &Body<'tcx>,
     promoted: &IndexSlice<Promoted, Body<'tcx>>,
     location_table: &LocationTable,
-    param_env: ty::ParamEnv<'tcx>,
     flow_inits: &mut ResultsCursor<'a, 'tcx, MaybeInitializedPlaces<'a, 'tcx>>,
     move_data: &MoveData<'tcx>,
     borrow_set: &BorrowSet<'tcx>,
@@ -101,7 +99,6 @@ pub(crate) fn compute_regions<'a, 'tcx>(
     let MirTypeckResults { constraints, universal_region_relations, opaque_type_values } =
         type_check::type_check(
             infcx,
-            param_env,
             body,
             promoted,
             universal_regions,

compiler/rustc_borrowck/src/type_check/canonical.rs

@@ -132,7 +132,7 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
         locations: Locations,
         category: ConstraintCategory<'tcx>,
     ) {
-        let param_env = self.param_env;
+        let param_env = self.infcx.param_env;
         let predicate = predicate.upcast(self.tcx());
         let _: Result<_, ErrorGuaranteed> = self.fully_perform_op(
             locations,
@@ -158,7 +158,7 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
     where
         T: type_op::normalize::Normalizable<'tcx> + fmt::Display + Copy + 'tcx,
     {
-        let param_env = self.param_env;
+        let param_env = self.infcx.param_env;
         let result: Result<_, ErrorGuaranteed> = self.fully_perform_op(
             location.to_locations(),
             category,
@@ -176,7 +176,7 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
         let tcx = self.tcx();
         if self.infcx.next_trait_solver() {
             let body = self.body;
-            let param_env = self.param_env;
+            let param_env = self.infcx.param_env;
             self.fully_perform_op(
                 location.to_locations(),
                 ConstraintCategory::Boring,
@@ -223,7 +223,9 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
         let _: Result<_, ErrorGuaranteed> = self.fully_perform_op(
             Locations::All(span),
             ConstraintCategory::Boring,
-            self.param_env.and(type_op::ascribe_user_type::AscribeUserType { mir_ty, user_ty }),
+            self.infcx
+                .param_env
+                .and(type_op::ascribe_user_type::AscribeUserType { mir_ty, user_ty }),
         );
     }
 
@@ -250,7 +252,7 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
         let mir_ty = self.normalize(mir_ty, Locations::All(span));
 
         let cause = ObligationCause::dummy_with_span(span);
-        let param_env = self.param_env;
+        let param_env = self.infcx.param_env;
         let _: Result<_, ErrorGuaranteed> = self.fully_perform_op(
             Locations::All(span),
             ConstraintCategory::Boring,

compiler/rustc_borrowck/src/type_check/free_region_relations.rs

@@ -234,7 +234,7 @@ impl<'tcx> UniversalRegionRelationsBuilder<'_, 'tcx> {
             // In the new solver, normalize the type-outlives obligation assumptions.
             if self.infcx.next_trait_solver() {
                 match deeply_normalize(
-                    self.infcx.at(&ObligationCause::misc(span, defining_ty_def_id), self.param_env),
+                    self.infcx.at(&ObligationCause::misc(span, defining_ty_def_id), param_env),
                     outlives,
                 ) {
                     Ok(normalized_outlives) => {
@@ -274,15 +274,15 @@ impl<'tcx> UniversalRegionRelationsBuilder<'_, 'tcx> {
             if let Some(c) = constraints_unnorm {
                 constraints.push(c)
             }
-            let TypeOpOutput { output: norm_ty, constraints: constraints_normalize, .. } = self
+            let TypeOpOutput { output: norm_ty, constraints: constraints_normalize, .. } =
-                .param_env
+                param_env
-                .and(type_op::normalize::Normalize { value: ty })
+                    .and(type_op::normalize::Normalize { value: ty })
-                .fully_perform(self.infcx, span)
+                    .fully_perform(self.infcx, span)
-                .unwrap_or_else(|guar| TypeOpOutput {
+                    .unwrap_or_else(|guar| TypeOpOutput {
-                    output: Ty::new_error(self.infcx.tcx, guar),
+                        output: Ty::new_error(self.infcx.tcx, guar),
-                    constraints: None,
+                        constraints: None,
-                    error_info: None,
+                        error_info: None,
-                });
+                    });
             if let Some(c) = constraints_normalize {
                 constraints.push(c)
             }
@@ -312,8 +312,7 @@ impl<'tcx> UniversalRegionRelationsBuilder<'_, 'tcx> {
         // Add implied bounds from impl header.
         if matches!(tcx.def_kind(defining_ty_def_id), DefKind::AssocFn | DefKind::AssocConst) {
             for &(ty, _) in tcx.assumed_wf_types(tcx.local_parent(defining_ty_def_id)) {
-                let result: Result<_, ErrorGuaranteed> = self
+                let result: Result<_, ErrorGuaranteed> = param_env
-                    .param_env
                     .and(type_op::normalize::Normalize { value: ty })
                     .fully_perform(self.infcx, span);
                 let Ok(TypeOpOutput { output: norm_ty, constraints: c, .. }) = result else {

compiler/rustc_borrowck/src/type_check/liveness/trace.rs

@@ -608,7 +608,7 @@ impl<'tcx> LivenessContext<'_, '_, '_, 'tcx> {
 
         value.visit_with(&mut for_liveness::FreeRegionsVisitor {
             tcx: typeck.tcx(),
-            param_env: typeck.param_env,
+            param_env: typeck.infcx.param_env,
             op: |r| {
                 let live_region_vid = typeck.universal_regions.to_region_vid(r);
 
@@ -621,6 +621,7 @@ impl<'tcx> LivenessContext<'_, '_, '_, 'tcx> {
         debug!("compute_drop_data(dropped_ty={:?})", dropped_ty,);
 
         match typeck
+            .infcx
             .param_env
             .and(DropckOutlives { dropped_ty })
             .fully_perform(typeck.infcx, DUMMY_SP)

compiler/rustc_borrowck/src/type_check/mod.rs

@@ -118,7 +118,6 @@ mod relate_tys;
 /// - `elements` -- MIR region map
 pub(crate) fn type_check<'a, 'tcx>(
     infcx: &BorrowckInferCtxt<'tcx>,
-    param_env: ty::ParamEnv<'tcx>,
     body: &Body<'tcx>,
     promoted: &IndexSlice<Promoted, Body<'tcx>>,
     universal_regions: UniversalRegions<'tcx>,
@@ -147,7 +146,7 @@ pub(crate) fn type_check<'a, 'tcx>(
         known_type_outlives_obligations,
     } = free_region_relations::create(
         infcx,
-        param_env,
+        infcx.param_env,
         implicit_region_bound,
         universal_regions,
         &mut constraints,
@@ -157,7 +156,6 @@ pub(crate) fn type_check<'a, 'tcx>(
 
     let mut checker = TypeChecker {
         infcx,
-        param_env,
         last_span: body.span,
         body,
         user_type_annotations: &body.user_type_annotations,
@@ -828,7 +826,6 @@ impl<'a, 'b, 'tcx> TypeVerifier<'a, 'b, 'tcx> {
 /// NLL region checking.
 struct TypeChecker<'a, 'tcx> {
     infcx: &'a BorrowckInferCtxt<'tcx>,
-    param_env: ty::ParamEnv<'tcx>,
     last_span: Span,
     body: &'a Body<'tcx>,
     /// User type annotations are shared between the main MIR and the MIR of
@@ -1017,7 +1014,7 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
             self.universal_regions,
             &self.region_bound_pairs,
             self.implicit_region_bound,
-            self.param_env,
+            self.infcx.param_env,
             &self.known_type_outlives_obligations,
             locations,
             locations.span(self.body),
@@ -1517,9 +1514,10 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
                 // The signature in this call can reference region variables,
                 // so erase them before calling a query.
                 let output_ty = self.tcx().erase_regions(sig.output());
-                if !output_ty
+                if !output_ty.is_privately_uninhabited(
-                    .is_privately_uninhabited(self.tcx(), self.infcx.typing_env(self.param_env))
+                    self.tcx(),
-                {
+                    self.infcx.typing_env(self.infcx.param_env),
+                ) {
                     span_mirbug!(self, term, "call to converging function {:?} w/o dest", sig);
                 }
             }
@@ -1729,7 +1727,7 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
         // `Sized` bound in no way depends on precise regions, so this
         // shouldn't affect `is_sized`.
         let erased_ty = tcx.erase_regions(ty);
-        if !erased_ty.is_sized(tcx, self.param_env) {
+        if !erased_ty.is_sized(tcx, self.infcx.param_env) {
             // in current MIR construction, all non-control-flow rvalue
             // expressions evaluate through `as_temp` or `into` a return
             // slot or local, so to find all unsized rvalues it is enough
@@ -2781,7 +2779,7 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
                 self.universal_regions,
                 &self.region_bound_pairs,
                 self.implicit_region_bound,
-                self.param_env,
+                self.infcx.param_env,
                 &self.known_type_outlives_obligations,
                 locations,
                 self.body.span,             // irrelevant; will be overridden.

compiler/rustc_borrowck/src/type_check/relate_tys.rs

@@ -522,7 +522,7 @@ impl<'b, 'tcx> PredicateEmittingRelation<InferCtxt<'tcx>> for NllTypeRelating<'_
     }
 
     fn param_env(&self) -> ty::ParamEnv<'tcx> {
-        self.type_checker.param_env
+        self.type_checker.infcx.param_env
     }
 
     fn register_predicates(

compiler/rustc_borrowck/src/universal_regions.rs

@@ -248,12 +248,8 @@ impl<'tcx> UniversalRegions<'tcx> {
     /// MIR -- that is, all the regions that appear in the function's
     /// signature. This will also compute the relationships that are
     /// known between those regions.
-    pub(crate) fn new(
+    pub(crate) fn new(infcx: &BorrowckInferCtxt<'tcx>, mir_def: LocalDefId) -> Self {
-        infcx: &BorrowckInferCtxt<'tcx>,
+        UniversalRegionsBuilder { infcx, mir_def }.build()
-        mir_def: LocalDefId,
-        param_env: ty::ParamEnv<'tcx>,
-    ) -> Self {
-        UniversalRegionsBuilder { infcx, mir_def, param_env }.build()
     }
 
     /// Given a reference to a closure type, extracts all the values
@@ -426,7 +422,6 @@ impl<'tcx> UniversalRegions<'tcx> {
 struct UniversalRegionsBuilder<'infcx, 'tcx> {
     infcx: &'infcx BorrowckInferCtxt<'tcx>,
     mir_def: LocalDefId,
-    param_env: ty::ParamEnv<'tcx>,
 }
 
 const FR: NllRegionVariableOrigin = NllRegionVariableOrigin::FreeRegion;
@@ -435,7 +430,7 @@ impl<'cx, 'tcx> UniversalRegionsBuilder<'cx, 'tcx> {
     fn build(self) -> UniversalRegions<'tcx> {
         debug!("build(mir_def={:?})", self.mir_def);
 
-        let param_env = self.param_env;
+        let param_env = self.infcx.param_env;
         debug!("build: param_env={:?}", param_env);
 
         assert_eq!(FIRST_GLOBAL_INDEX, self.infcx.num_region_vars());