Rename is_object_safe to check_is_object_safe to hint side effects

compiler/rustc_hir_analysis/src/check/wfcheck.rs

@@ -834,7 +834,7 @@ fn check_object_unsafe_self_trait_by_name(tcx: TyCtxt<'_>, item: &hir::TraitItem
         _ => {}
     }
     if !trait_should_be_self.is_empty() {
-        if tcx.is_object_safe(trait_def_id) {
+        if tcx.check_is_object_safe(trait_def_id) {
             return;
         }
         let sugg = trait_should_be_self.iter().map(|span| (*span, "Self".to_string())).collect();

compiler/rustc_hir_analysis/src/coherence/mod.rs

@@ -169,7 +169,7 @@ fn check_object_overlap<'tcx>(
         });
 
         for component_def_id in component_def_ids {
-            if !tcx.is_object_safe(component_def_id) {
+            if !tcx.check_is_object_safe(component_def_id) {
                 // Without the 'object_safe_for_dispatch' feature this is an error
                 // which will be reported by wfcheck. Ignore it here.
                 // This is tested by `coherence-impl-trait-for-trait-object-safe.rs`.

compiler/rustc_hir_typeck/src/coercion.rs

@@ -1823,7 +1823,7 @@ impl<'tcx, 'exprs, E: AsCoercionSite> CoerceMany<'tcx, 'exprs, E> {
                         .trait_ref()
                         .and_then(|t| t.trait_def_id())
                         .map_or(false, |def_id| {
-                            fcx.tcx.is_object_safe(def_id)
+                            fcx.tcx.check_is_object_safe(def_id)
                         })
                 })
             }

compiler/rustc_middle/src/query/mod.rs

@@ -1274,8 +1274,8 @@ rustc_queries! {
     query object_safety_violations(trait_id: DefId) -> &'tcx [traits::ObjectSafetyViolation] {
         desc { |tcx| "determining object safety of trait `{}`", tcx.def_path_str(trait_id) }
     }
-    query is_object_safe(trait_id: DefId) -> bool {
+    query check_is_object_safe(trait_id: DefId) -> bool {
-        desc { |tcx| "determining object safety of trait `{}`", tcx.def_path_str(trait_id) }
+        desc { |tcx| "checking if trait `{}` is object safe", tcx.def_path_str(trait_id) }
     }
 
     /// Gets the ParameterEnvironment for a given item; this environment

compiler/rustc_trait_selection/src/solve/mod.rs

@@ -363,7 +363,7 @@ impl<'a, 'tcx> EvalCtxt<'a, 'tcx> {
     }
 
     fn compute_object_safe_goal(&mut self, trait_def_id: DefId) -> QueryResult<'tcx> {
-        if self.tcx().is_object_safe(trait_def_id) {
+        if self.tcx().check_is_object_safe(trait_def_id) {
             self.make_canonical_response(Certainty::Yes)
         } else {
             Err(NoSolution)

compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs

@@ -1749,7 +1749,9 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
         let is_object_safe = match ty.kind() {
             ty::Dynamic(predicates, _, ty::Dyn) => {
                 // If the `dyn Trait` is not object safe, do not suggest `Box<dyn Trait>`.
-                predicates.principal_def_id().map_or(true, |def_id| self.tcx.is_object_safe(def_id))
+                predicates
+                    .principal_def_id()
+                    .map_or(true, |def_id| self.tcx.check_is_object_safe(def_id))
             }
             // We only want to suggest `impl Trait` to `dyn Trait`s.
             // For example, `fn foo() -> str` needs to be filtered out.

compiler/rustc_trait_selection/src/traits/fulfill.rs

@@ -369,7 +369,7 @@ impl<'a, 'tcx> ObligationProcessor for FulfillProcessor<'a, 'tcx> {
                 }
 
                 ty::PredicateKind::ObjectSafe(trait_def_id) => {
-                    if !self.selcx.tcx().is_object_safe(trait_def_id) {
+                    if !self.selcx.tcx().check_is_object_safe(trait_def_id) {
                         ProcessResult::Error(CodeSelectionError(Unimplemented))
                     } else {
                         ProcessResult::Changed(vec![])

compiler/rustc_trait_selection/src/traits/object_safety.rs

@@ -62,7 +62,7 @@ fn object_safety_violations(tcx: TyCtxt<'_>, trait_def_id: DefId) -> &'_ [Object
     )
 }
 
-fn is_object_safe(tcx: TyCtxt<'_>, trait_def_id: DefId) -> bool {
+fn check_is_object_safe(tcx: TyCtxt<'_>, trait_def_id: DefId) -> bool {
     let violations = tcx.object_safety_violations(trait_def_id);
 
     if violations.is_empty() {
@@ -884,5 +884,6 @@ pub fn contains_illegal_impl_trait_in_trait<'tcx>(
 }
 
 pub fn provide(providers: &mut ty::query::Providers) {
-    *providers = ty::query::Providers { object_safety_violations, is_object_safe, ..*providers };
+    *providers =
+        ty::query::Providers { object_safety_violations, check_is_object_safe, ..*providers };
 }

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

@@ -466,7 +466,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
                     if let Some(principal) = data.principal() {
                         if !self.infcx.tcx.features().object_safe_for_dispatch {
                             principal.with_self_ty(self.tcx(), self_ty)
-                        } else if self.tcx().is_object_safe(principal.def_id()) {
+                        } else if self.tcx().check_is_object_safe(principal.def_id()) {
                             principal.with_self_ty(self.tcx(), self_ty)
                         } else {
                             return;

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

@@ -1009,7 +1009,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
             // `T` -> `Trait`
             (_, &ty::Dynamic(ref data, r, ty::Dyn)) => {
                 let mut object_dids = data.auto_traits().chain(data.principal_def_id());
-                if let Some(did) = object_dids.find(|did| !tcx.is_object_safe(*did)) {
+                if let Some(did) = object_dids.find(|did| !tcx.check_is_object_safe(*did)) {
                     return Err(TraitNotObjectSafe(did));
                 }
 

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

@@ -797,7 +797,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
                 }
 
                 ty::PredicateKind::ObjectSafe(trait_def_id) => {
-                    if self.tcx().is_object_safe(trait_def_id) {
+                    if self.tcx().check_is_object_safe(trait_def_id) {
                         Ok(EvaluatedToOk)
                     } else {
                         Ok(EvaluatedToErr)

compiler/rustc_traits/src/chalk/db.rs

@@ -580,7 +580,7 @@ impl<'tcx> chalk_solve::RustIrDatabase<RustInterner<'tcx>> for RustIrDatabase<'t
     }
 
     fn is_object_safe(&self, trait_id: chalk_ir::TraitId<RustInterner<'tcx>>) -> bool {
-        self.interner.tcx.is_object_safe(trait_id.0)
+        self.interner.tcx.check_is_object_safe(trait_id.0)
     }
 
     fn hidden_opaque_type(