remove an unused DefId

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,