Auto merge of rust-lang#97135 - Dylan-DPC:rollup-06u9pqn, r=Dylan-DPC

Rollup of 6 pull requests

Successful merges:

 - rust-lang#94639 (Suggest dereferencing non-lval mutable reference on assignment)
 - rust-lang#95979 (update coherence docs, fix generator + opaque type ICE)
 - rust-lang#96378 (Mention traits and types involved in unstable trait upcasting)
 - rust-lang#96917 (Make HashMap fall back to RtlGenRandom if BCryptGenRandom fails)
 - rust-lang#97101 (Add tracking issue for ExitCode::exit_process)
 - rust-lang#97123 (Clean fix for rust-lang#96223)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

compiler/rustc_middle/src/traits/mod.rs

@@ -61,6 +61,9 @@ pub enum Reveal {
     ///     let x: <() as Assoc>::Output = true;
     /// }
     /// ```
+    ///
+    /// We also do not reveal the hidden type of opaque types during
+    /// type-checking.
     UserFacing,
 
     /// At codegen time, all monomorphic projections will succeed.

compiler/rustc_trait_selection/src/traits/coherence.rs

@@ -645,7 +645,7 @@ fn orphan_check_trait_ref<'tcx>(
                 .substs
                 .types()
                 .flat_map(|ty| uncover_fundamental_ty(tcx, ty, in_crate))
-                .find(|ty| ty_is_local_constructor(*ty, in_crate));
+                .find(|&ty| ty_is_local_constructor(tcx, ty, in_crate));
 
             debug!("orphan_check_trait_ref: uncovered ty local_type: `{:?}`", local_type);
 
@@ -677,7 +677,7 @@ fn contained_non_local_types<'tcx>(
     ty: Ty<'tcx>,
     in_crate: InCrate,
 ) -> Vec<Ty<'tcx>> {
-    if ty_is_local_constructor(ty, in_crate) {
+    if ty_is_local_constructor(tcx, ty, in_crate) {
         Vec::new()
     } else {
         match fundamental_ty_inner_tys(tcx, ty) {
@@ -730,7 +730,7 @@ fn def_id_is_local(def_id: DefId, in_crate: InCrate) -> bool {
     }
 }
 
-fn ty_is_local_constructor(ty: Ty<'_>, in_crate: InCrate) -> bool {
+fn ty_is_local_constructor(tcx: TyCtxt<'_>, ty: Ty<'_>, in_crate: InCrate) -> bool {
     debug!("ty_is_local_constructor({:?})", ty);
 
     match *ty.kind() {
@@ -789,11 +789,6 @@ fn ty_is_local_constructor(ty: Ty<'_>, in_crate: InCrate) -> bool {
             false
         }
 
-        ty::Closure(..) => {
-            // Similar to the `Opaque` case (#83613).
-            false
-        }
-
         ty::Dynamic(ref tt, ..) => {
             if let Some(principal) = tt.principal() {
                 def_id_is_local(principal.def_id(), in_crate)
@@ -804,8 +799,20 @@ fn ty_is_local_constructor(ty: Ty<'_>, in_crate: InCrate) -> bool {
 
         ty::Error(_) => true,
 
-        ty::Generator(..) | ty::GeneratorWitness(..) => {
-            bug!("ty_is_local invoked on unexpected type: {:?}", ty)
+        // These variants should never appear during coherence checking because they
+        // cannot be named directly.
+        //
+        // They could be indirectly used through an opaque type. While using opaque types
+        // in impls causes an error, this path can still be hit afterwards.
+        //
+        // See `test/ui/coherence/coherence-with-closure.rs` for an example where this
+        // could happens.
+        ty::Closure(..) | ty::Generator(..) | ty::GeneratorWitness(..) => {
+            tcx.sess.delay_span_bug(
+                DUMMY_SP,
+                format!("ty_is_local invoked on closure or generator: {:?}", ty),
+            );
+            true
         }
     }
 }

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

@@ -1384,8 +1384,7 @@ trait InferCtxtPrivExt<'hir, 'tcx> {
     fn mk_trait_obligation_with_new_self_ty(
         &self,
         param_env: ty::ParamEnv<'tcx>,
-        trait_ref: ty::PolyTraitPredicate<'tcx>,
-        new_self_ty: Ty<'tcx>,
+        trait_ref_and_ty: ty::Binder<'tcx, (ty::TraitPredicate<'tcx>, Ty<'tcx>)>,
     ) -> PredicateObligation<'tcx>;
 
     fn maybe_report_ambiguity(
@@ -1923,14 +1922,11 @@ impl<'a, 'tcx> InferCtxtPrivExt<'a, 'tcx> for InferCtxt<'a, 'tcx> {
     fn mk_trait_obligation_with_new_self_ty(
         &self,
         param_env: ty::ParamEnv<'tcx>,
-        trait_ref: ty::PolyTraitPredicate<'tcx>,
-        new_self_ty: Ty<'tcx>,
+        trait_ref_and_ty: ty::Binder<'tcx, (ty::TraitPredicate<'tcx>, Ty<'tcx>)>,
     ) -> PredicateObligation<'tcx> {
-        assert!(!new_self_ty.has_escaping_bound_vars());
-
-        let trait_pred = trait_ref.map_bound_ref(|tr| ty::TraitPredicate {
+        let trait_pred = trait_ref_and_ty.map_bound_ref(|(tr, new_self_ty)| ty::TraitPredicate {
             trait_ref: ty::TraitRef {
-                substs: self.tcx.mk_substs_trait(new_self_ty, &tr.trait_ref.substs[1..]),
+                substs: self.tcx.mk_substs_trait(*new_self_ty, &tr.trait_ref.substs[1..]),
                 ..tr.trait_ref
             },
             ..*tr