remove an unused DefId

compiler/rustc_infer/src/infer/free_regions.rs

@@ -4,7 +4,6 @@
 //! and use that to decide when one free region outlives another, and so forth.
 
 use rustc_data_structures::transitive_relation::TransitiveRelation;
-use rustc_hir::def_id::DefId;
 use rustc_middle::ty::{self, Lift, Region, TyCtxt};
 
 /// Combines a `FreeRegionMap` and a `TyCtxt`.
@@ -14,16 +13,13 @@ use rustc_middle::ty::{self, Lift, Region, TyCtxt};
 pub(crate) struct RegionRelations<'a, 'tcx> {
     pub tcx: TyCtxt<'tcx>,
 
-    /// The context used for debug messages
-    pub context: DefId,
-
     /// Free-region relationships.
     pub free_regions: &'a FreeRegionMap<'tcx>,
 }
 
 impl<'a, 'tcx> RegionRelations<'a, 'tcx> {
-    pub fn new(tcx: TyCtxt<'tcx>, context: DefId, free_regions: &'a FreeRegionMap<'tcx>) -> Self {
+    pub fn new(tcx: TyCtxt<'tcx>, free_regions: &'a FreeRegionMap<'tcx>) -> Self {
-        Self { tcx, context, free_regions }
+        Self { tcx, free_regions }
     }
 
     pub fn lub_free_regions(&self, r_a: Region<'tcx>, r_b: Region<'tcx>) -> Region<'tcx> {

compiler/rustc_infer/src/infer/lexical_region_resolve/mod.rs

@@ -120,13 +120,9 @@ impl<'cx, 'tcx> LexicalResolver<'cx, 'tcx> {
     ) -> LexicalRegionResolutions<'tcx> {
         let mut var_data = self.construct_var_data(self.tcx());
 
-        // Dorky hack to cause `dump_constraints` to only get called
+        if cfg!(debug_assertions) {
-        // if debug mode is enabled:
+            self.dump_constraints();
-        debug!(
+        }
-            "----() End constraint listing (context={:?}) {:?}---",
-            self.region_rels.context,
-            self.dump_constraints(self.region_rels)
-        );
 
         let graph = self.construct_graph();
         self.expand_givens(&graph);
@@ -156,8 +152,8 @@ impl<'cx, 'tcx> LexicalResolver<'cx, 'tcx> {
         }
     }
 
-    fn dump_constraints(&self, free_regions: &RegionRelations<'_, 'tcx>) {
+    #[instrument(level = "debug", skip(self))]
-        debug!("----() Start constraint listing (context={:?}) ()----", free_regions.context);
+    fn dump_constraints(&self) {
         for (idx, (constraint, _)) in self.data.constraints.iter().enumerate() {
             debug!("Constraint {} => {:?}", idx, constraint);
         }

compiler/rustc_infer/src/infer/mod.rs

@@ -1267,7 +1267,6 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
     /// `resolve_vars_if_possible` as well as `fully_resolve`.
     pub fn resolve_regions(
         &self,
-        region_context: DefId,
         outlives_env: &OutlivesEnvironment<'tcx>,
     ) -> Vec<RegionResolutionError<'tcx>> {
         let (var_infos, data) = {
@@ -1286,8 +1285,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
                 .into_infos_and_data()
         };
 
-        let region_rels =
+        let region_rels = &RegionRelations::new(self.tcx, outlives_env.free_region_map());
-            &RegionRelations::new(self.tcx, region_context, outlives_env.free_region_map());
 
         let (lexical_region_resolutions, errors) =
             lexical_region_resolve::resolve(outlives_env.param_env, region_rels, var_infos, data);
@@ -1302,12 +1300,8 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
     /// result. After this, no more unification operations should be
     /// done -- or the compiler will panic -- but it is legal to use
     /// `resolve_vars_if_possible` as well as `fully_resolve`.
-    pub fn resolve_regions_and_report_errors(
+    pub fn resolve_regions_and_report_errors(&self, outlives_env: &OutlivesEnvironment<'tcx>) {
-        &self,
+        let errors = self.resolve_regions(outlives_env);
-        region_context: DefId,
-        outlives_env: &OutlivesEnvironment<'tcx>,
-    ) {
-        let errors = self.resolve_regions(region_context, outlives_env);
 
         if !self.is_tainted_by_errors() {
             // As a heuristic, just skip reporting region errors

compiler/rustc_trait_selection/src/traits/coherence.rs

@@ -317,14 +317,13 @@ fn negative_impl<'cx, 'tcx>(
         let (subject2, obligations) =
             impl_subject_and_oblig(selcx, impl_env, impl2_def_id, impl2_substs);
 
-        !equate(&infcx, impl_env, impl1_def_id, subject1, subject2, obligations)
+        !equate(&infcx, impl_env, subject1, subject2, obligations)
     })
 }
 
 fn equate<'cx, 'tcx>(
     infcx: &InferCtxt<'cx, 'tcx>,
     impl_env: ty::ParamEnv<'tcx>,
-    impl1_def_id: DefId,
     subject1: ImplSubject<'tcx>,
     subject2: ImplSubject<'tcx>,
     obligations: impl Iterator<Item = PredicateObligation<'tcx>>,
@@ -341,7 +340,7 @@ fn equate<'cx, 'tcx>(
     let opt_failing_obligation = obligations
         .into_iter()
         .chain(more_obligations)
-        .find(|o| negative_impl_exists(selcx, impl_env, impl1_def_id, o));
+        .find(|o| negative_impl_exists(selcx, impl_env, o));
 
     if let Some(failing_obligation) = opt_failing_obligation {
         debug!("overlap: obligation unsatisfiable {:?}", failing_obligation);
@@ -356,18 +355,17 @@ fn equate<'cx, 'tcx>(
 fn negative_impl_exists<'cx, 'tcx>(
     selcx: &SelectionContext<'cx, 'tcx>,
     param_env: ty::ParamEnv<'tcx>,
-    region_context: DefId,
     o: &PredicateObligation<'tcx>,
 ) -> bool {
     let infcx = &selcx.infcx().fork();
 
-    if resolve_negative_obligation(infcx, param_env, region_context, o) {
+    if resolve_negative_obligation(infcx, param_env, o) {
         return true;
     }
 
     // Try to prove a negative obligation exists for super predicates
     for o in util::elaborate_predicates(infcx.tcx, iter::once(o.predicate)) {
-        if resolve_negative_obligation(infcx, param_env, region_context, &o) {
+        if resolve_negative_obligation(infcx, param_env, &o) {
             return true;
         }
     }
@@ -379,7 +377,6 @@ fn negative_impl_exists<'cx, 'tcx>(
 fn resolve_negative_obligation<'cx, 'tcx>(
     infcx: &InferCtxt<'cx, 'tcx>,
     param_env: ty::ParamEnv<'tcx>,
-    region_context: DefId,
     o: &PredicateObligation<'tcx>,
 ) -> bool {
     let tcx = infcx.tcx;
@@ -409,7 +406,7 @@ fn resolve_negative_obligation<'cx, 'tcx>(
 
     infcx.process_registered_region_obligations(outlives_env.region_bound_pairs_map(), param_env);
 
-    let errors = infcx.resolve_regions(region_context, &outlives_env);
+    let errors = infcx.resolve_regions(&outlives_env);
 
     if !errors.is_empty() {
         return false;

compiler/rustc_trait_selection/src/traits/mod.rs

@@ -198,17 +198,13 @@ pub fn type_known_to_meet_bound_modulo_regions<'a, 'tcx>(
     }
 }
 
+#[instrument(level = "debug", skip(tcx, elaborated_env))]
 fn do_normalize_predicates<'tcx>(
     tcx: TyCtxt<'tcx>,
-    region_context: DefId,
     cause: ObligationCause<'tcx>,
     elaborated_env: ty::ParamEnv<'tcx>,
     predicates: Vec<ty::Predicate<'tcx>>,
 ) -> Result<Vec<ty::Predicate<'tcx>>, ErrorGuaranteed> {
-    debug!(
-        "do_normalize_predicates(predicates={:?}, region_context={:?}, cause={:?})",
-        predicates, region_context, cause,
-    );
     let span = cause.span;
     tcx.infer_ctxt().enter(|infcx| {
         // FIXME. We should really... do something with these region
@@ -240,7 +236,7 @@ fn do_normalize_predicates<'tcx>(
         // cares about declarations like `'a: 'b`.
         let outlives_env = OutlivesEnvironment::new(elaborated_env);
 
-        infcx.resolve_regions_and_report_errors(region_context, &outlives_env);
+        infcx.resolve_regions_and_report_errors(&outlives_env);
 
         let predicates = match infcx.fully_resolve(predicates) {
             Ok(predicates) => predicates,
@@ -269,9 +265,9 @@ fn do_normalize_predicates<'tcx>(
 
 // FIXME: this is gonna need to be removed ...
 /// Normalizes the parameter environment, reporting errors if they occur.
+#[instrument(level = "debug", skip(tcx))]
 pub fn normalize_param_env_or_error<'tcx>(
     tcx: TyCtxt<'tcx>,
-    region_context: DefId,
     unnormalized_env: ty::ParamEnv<'tcx>,
     cause: ObligationCause<'tcx>,
 ) -> ty::ParamEnv<'tcx> {
@@ -289,12 +285,6 @@ pub fn normalize_param_env_or_error<'tcx>(
     // parameter environments once for every fn as it goes,
     // and errors will get reported then; so outside of type inference we
     // can be sure that no errors should occur.
-
-    debug!(
-        "normalize_param_env_or_error(region_context={:?}, unnormalized_env={:?}, cause={:?})",
-        region_context, unnormalized_env, cause
-    );
-
     let mut predicates: Vec<_> =
         util::elaborate_predicates(tcx, unnormalized_env.caller_bounds().into_iter())
             .map(|obligation| obligation.predicate)
@@ -338,7 +328,6 @@ pub fn normalize_param_env_or_error<'tcx>(
     );
     let Ok(non_outlives_predicates) = do_normalize_predicates(
         tcx,
-        region_context,
         cause.clone(),
         elaborated_env,
         predicates,
@@ -362,7 +351,6 @@ pub fn normalize_param_env_or_error<'tcx>(
     );
     let Ok(outlives_predicates) = do_normalize_predicates(
         tcx,
-        region_context,
         cause,
         outlives_env,
         outlives_predicates,

compiler/rustc_ty_utils/src/ty.rs

@@ -211,7 +211,7 @@ fn param_env(tcx: TyCtxt<'_>, def_id: DefId) -> ty::ParamEnv<'_> {
         tcx.hir().maybe_body_owned_by(id).map_or(id, |body| body.hir_id)
     });
     let cause = traits::ObligationCause::misc(tcx.def_span(def_id), body_id);
-    traits::normalize_param_env_or_error(tcx, def_id, unnormalized_env, cause)
+    traits::normalize_param_env_or_error(tcx, unnormalized_env, cause)
 }
 
 /// Elaborate the environment.

compiler/rustc_typeck/src/check/compare_method.rs

@@ -208,8 +208,7 @@ fn compare_predicate_entailment<'tcx>(
         Reveal::UserFacing,
         hir::Constness::NotConst,
     );
-    let param_env =
+    let param_env = traits::normalize_param_env_or_error(tcx, param_env, normalize_cause);
-        traits::normalize_param_env_or_error(tcx, impl_m.def_id, param_env, normalize_cause);
 
     tcx.infer_ctxt().enter(|infcx| {
         let inh = Inherited::new(infcx, impl_m.def_id.expect_local());
@@ -1247,12 +1246,7 @@ fn compare_type_predicate_entailment<'tcx>(
         Reveal::UserFacing,
         hir::Constness::NotConst,
     );
-    let param_env = traits::normalize_param_env_or_error(
+    let param_env = traits::normalize_param_env_or_error(tcx, param_env, normalize_cause.clone());
-        tcx,
-        impl_ty.def_id,
-        param_env,
-        normalize_cause.clone(),
-    );
     tcx.infer_ctxt().enter(|infcx| {
         let inh = Inherited::new(infcx, impl_ty.def_id.expect_local());
         let infcx = &inh.infcx;

compiler/rustc_typeck/src/check/regionck.rs

@@ -222,10 +222,8 @@ pub struct RegionCtxt<'a, 'tcx> {
 
     // id of innermost fn body id
     body_id: hir::HirId,
+    // TODO: is this always equal to `body_id`?
     body_owner: LocalDefId,
-
-    // id of AST node being analyzed (the subject of the analysis).
-    subject_def_id: LocalDefId,
 }
 
 impl<'a, 'tcx> Deref for RegionCtxt<'a, 'tcx> {
@@ -245,13 +243,7 @@ impl<'a, 'tcx> RegionCtxt<'a, 'tcx> {
         param_env: ty::ParamEnv<'tcx>,
     ) -> RegionCtxt<'a, 'tcx> {
         let outlives_environment = OutlivesEnvironment::new(param_env);
-        RegionCtxt {
+        RegionCtxt { fcx, body_id: initial_body_id, body_owner: subject, outlives_environment }
-            fcx,
-            body_id: initial_body_id,
-            body_owner: subject,
-            subject_def_id: subject,
-            outlives_environment,
-        }
     }
 
     /// Try to resolve the type for the given node, returning `t_err` if an error results. Note that
@@ -369,10 +361,7 @@ impl<'a, 'tcx> RegionCtxt<'a, 'tcx> {
             self.param_env,
         );
 
-        self.fcx.resolve_regions_and_report_errors(
+        self.fcx.resolve_regions_and_report_errors(&self.outlives_environment);
-            self.subject_def_id.to_def_id(),
-            &self.outlives_environment,
-        );
     }
 
     fn constrain_bindings_in_pat(&mut self, pat: &hir::Pat<'_>) {

compiler/rustc_typeck/src/check/wfcheck.rs

@@ -661,7 +661,7 @@ fn resolve_regions_with_wf_tys<'tcx>(
 
         add_constraints(&infcx, region_bound_pairs);
 
-        let errors = infcx.resolve_regions(id.expect_owner().to_def_id(), &outlives_environment);
+        let errors = infcx.resolve_regions(&outlives_environment);
 
         debug!(?errors, "errors");
 

compiler/rustc_typeck/src/coherence/builtin.rs

@@ -349,7 +349,7 @@ fn visit_implementation_of_dispatch_from_dyn<'tcx>(tcx: TyCtxt<'tcx>, impl_did:
 
                     // Finally, resolve all regions.
                     let outlives_env = OutlivesEnvironment::new(param_env);
-                    infcx.resolve_regions_and_report_errors(impl_did.to_def_id(), &outlives_env);
+                    infcx.resolve_regions_and_report_errors(&outlives_env);
                 }
             }
             _ => {
@@ -606,7 +606,7 @@ pub fn coerce_unsized_info<'tcx>(tcx: TyCtxt<'tcx>, impl_did: DefId) -> CoerceUn
 
         // Finally, resolve all regions.
         let outlives_env = OutlivesEnvironment::new(param_env);
-        infcx.resolve_regions_and_report_errors(impl_did.to_def_id(), &outlives_env);
+        infcx.resolve_regions_and_report_errors(&outlives_env);
 
         CoerceUnsizedInfo { custom_kind: kind }
     })

compiler/rustc_typeck/src/impl_wf_check/min_specialization.rs

@@ -150,7 +150,7 @@ fn get_impl_substs<'tcx>(
 
     // Conservatively use an empty `ParamEnv`.
     let outlives_env = OutlivesEnvironment::new(ty::ParamEnv::empty());
-    infcx.resolve_regions_and_report_errors(impl1_def_id.to_def_id(), &outlives_env);
+    infcx.resolve_regions_and_report_errors(&outlives_env);
     let Ok(impl2_substs) = infcx.fully_resolve(impl2_substs) else {
         let span = tcx.def_span(impl1_def_id);
         tcx.sess.emit_err(SubstsOnOverriddenImpl { span });