Revert "Fix trait object reborrow suggestion"

This reverts commit 6c0a591.

Author: compiler-errors

Cargo.lock

@@ -333,7 +333,6 @@ dependencies = [
  "libgit2-sys",
  "log",
  "memchr",
- "num_cpus",
  "opener",
  "openssl",
  "os_info",
@@ -445,7 +444,7 @@ dependencies = [
 
 [[package]]
 name = "cargo-util"
-version = "0.1.4"
+version = "0.1.3"
 dependencies = [
  "anyhow",
  "core-foundation",
@@ -2330,6 +2329,20 @@ dependencies = [
  "topological-sort",
 ]
 
+[[package]]
+name = "measureme"
+version = "9.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "78f7a41bc6f856a2cf0e95094ad5121f82500e2d9a0f3c0171d98f6566d8117d"
+dependencies = [
+ "log",
+ "memmap2",
+ "parking_lot 0.11.2",
+ "perf-event-open-sys",
+ "rustc-hash",
+ "smallvec",
+]
+
 [[package]]
 name = "measureme"
 version = "10.0.0"
@@ -2428,7 +2441,7 @@ dependencies = [
  "lazy_static",
  "libc",
  "log",
- "measureme",
+ "measureme 9.1.2",
  "rand 0.8.5",
  "regex",
  "rustc-workspace-hack",
@@ -3040,6 +3053,7 @@ name = "racer"
 version = "2.2.2"
 dependencies = [
  "bitflags",
+ "clap 2.34.0",
  "derive_more",
  "env_logger 0.7.1",
  "humantime 2.0.1",
@@ -3263,7 +3277,7 @@ dependencies = [
  "difference",
  "env_logger 0.9.0",
  "futures 0.3.19",
- "heck 0.4.0",
+ "heck 0.3.1",
  "home",
  "itertools",
  "jsonrpc-core",
@@ -3639,7 +3653,7 @@ dependencies = [
  "cstr",
  "libc",
  "libloading",
- "measureme",
+ "measureme 10.0.0",
  "rustc-demangle",
  "rustc_ast",
  "rustc_attr",
@@ -3737,7 +3751,7 @@ dependencies = [
  "indexmap",
  "jobserver",
  "libc",
- "measureme",
+ "measureme 10.0.0",
  "memmap2",
  "parking_lot 0.11.2",
  "rustc-hash",
@@ -4294,7 +4308,7 @@ dependencies = [
 name = "rustc_query_impl"
 version = "0.0.0"
 dependencies = [
- "measureme",
+ "measureme 10.0.0",
  "rustc-rayon-core",
  "rustc_ast",
  "rustc_data_structures",

compiler/rustc_middle/src/traits/mod.rs

@@ -253,7 +253,7 @@ pub enum ObligationCauseCode<'tcx> {
     ObjectTypeBound(Ty<'tcx>, ty::Region<'tcx>),
 
     /// Obligation incurred due to an object cast.
-    ObjectCastObligation(/* Concrete type */ Ty<'tcx>, /* Object type */ Ty<'tcx>),
+    ObjectCastObligation(/* Object type */ Ty<'tcx>),
 
     /// Obligation incurred due to a coercion.
     Coercion {

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

@@ -484,9 +484,10 @@ impl<'a, 'tcx> InferCtxtExt<'tcx> for InferCtxt<'a, 'tcx> {
                             err.span_label(span, explanation);
                         }
 
-                        if let ObligationCauseCode::ObjectCastObligation(concrete_ty, obj_ty) = obligation.cause.code().peel_derives() &&
+                        if let ObligationCauseCode::ObjectCastObligation(obj_ty) = obligation.cause.code().peel_derives() &&
+                           let Some(self_ty) = trait_predicate.self_ty().no_bound_vars() &&
                            Some(trait_ref.def_id()) == self.tcx.lang_items().sized_trait() {
-                            self.suggest_borrowing_for_object_cast(&mut err, &root_obligation, *concrete_ty, *obj_ty);
+                            self.suggest_borrowing_for_object_cast(&mut err, &obligation, self_ty, *obj_ty);
                         }
 
                         if trait_predicate.is_const_if_const() && obligation.param_env.is_const() {
@@ -1559,7 +1560,7 @@ impl<'a, 'tcx> InferCtxtPrivExt<'a, 'tcx> for InferCtxt<'a, 'tcx> {
                     obligation.cause.code().peel_derives(),
                     ObligationCauseCode::ItemObligation(_)
                         | ObligationCauseCode::BindingObligation(_, _)
-                        | ObligationCauseCode::ObjectCastObligation(..)
+                        | ObligationCauseCode::ObjectCastObligation(_)
                         | ObligationCauseCode::OpaqueType
                 );
                 if let Err(error) = self.at(&obligation.cause, obligation.param_env).eq_exp(

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

@@ -2216,7 +2216,7 @@ impl<'a, 'tcx> InferCtxtExt<'tcx> for InferCtxt<'a, 'tcx> {
                     err.span_note(tcx.def_span(item_def_id), &descr);
                 }
             }
-            ObligationCauseCode::ObjectCastObligation(_, object_ty) => {
+            ObligationCauseCode::ObjectCastObligation(object_ty) => {
                 err.note(&format!(
                     "required for the cast to the object type `{}`",
                     self.ty_to_string(object_ty)

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

@@ -813,7 +813,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
                 let cause = ObligationCause::new(
                     obligation.cause.span,
                     obligation.cause.body_id,
-                    ObjectCastObligation(source, target),
+                    ObjectCastObligation(target),
                 );
                 let outlives = ty::OutlivesPredicate(r_a, r_b);
                 nested.push(Obligation::with_depth(
@@ -910,7 +910,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
                 let cause = ObligationCause::new(
                     obligation.cause.span,
                     obligation.cause.body_id,
-                    ObjectCastObligation(source, target),
+                    ObjectCastObligation(target),
                 );
                 let outlives = ty::OutlivesPredicate(r_a, r_b);
                 nested.push(Obligation::with_depth(
@@ -931,7 +931,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
                 let cause = ObligationCause::new(
                     obligation.cause.span,
                     obligation.cause.body_id,
-                    ObjectCastObligation(source, target),
+                    ObjectCastObligation(target),
                 );
 
                 let predicate_to_obligation = |predicate| {