Auto merge of #112987 - compiler-errors:rollup-6anskq1, r=compiler-errors

Rollup of 8 pull requests

Successful merges:

 - #111087 (Implement `Sync` for `mpsc::Sender`)
 - #112763 (Bump compiler_builtins)
 - #112963 (Stop bubbling out hidden types from the eval obligation queries)
 - #112965 (Don't emit same goal as input during `wf::unnormalized_obligations`)
 - #112973 (Make sure to include default en-US ftl resources for `rustc_error` crate)
 - #112981 (Fix return type notation errors with -Zlower-impl-trait-in-trait-to-assoc-ty)
 - #112983 (Fix return type notation associated type suggestion when -Zlower-impl-trait-in-trait-to-assoc-ty)
 - #112986 (Update cargo)

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

Author: bors

Cargo.lock

@@ -697,9 +697,9 @@ dependencies = [
 
 [[package]]
 name = "compiler_builtins"
-version = "0.1.92"
+version = "0.1.93"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "64518f1ae689f74db058bbfb3238dfe6eb53f59f4ae712f1ff4348628522e190"
+checksum = "76630810d973ecea3dbf611e1b7aecfb1012751ef1ff8de3998f89014a166781"
 dependencies = [
  "cc",
  "rustc-std-workspace-core",

compiler/rustc_driver_impl/src/lib.rs

@@ -97,6 +97,7 @@ pub static DEFAULT_LOCALE_RESOURCES: &[&str] = &[
     rustc_codegen_ssa::DEFAULT_LOCALE_RESOURCE,
     rustc_const_eval::DEFAULT_LOCALE_RESOURCE,
     rustc_error_messages::DEFAULT_LOCALE_RESOURCE,
+    rustc_errors::DEFAULT_LOCALE_RESOURCE,
     rustc_expand::DEFAULT_LOCALE_RESOURCE,
     rustc_hir_analysis::DEFAULT_LOCALE_RESOURCE,
     rustc_hir_typeck::DEFAULT_LOCALE_RESOURCE,

compiler/rustc_hir_analysis/src/astconv/bounds.rs

@@ -412,7 +412,7 @@ impl<'tcx> dyn AstConv<'tcx> + '_ {
             // an RPITIT (return-position impl trait in trait) or AFIT (async fn in trait).
             let output = tcx.fn_sig(assoc_item.def_id).skip_binder().output();
             let output = if let ty::Alias(ty::Projection, alias_ty) = *output.skip_binder().kind()
-                && tcx.def_kind(alias_ty.def_id) == DefKind::ImplTraitPlaceholder
+                && tcx.is_impl_trait_in_trait(alias_ty.def_id)
             {
                 alias_ty
             } else {

compiler/rustc_hir_analysis/src/astconv/errors.rs

@@ -122,9 +122,13 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
 
         let all_candidate_names: Vec<_> = all_candidates()
             .flat_map(|r| self.tcx().associated_items(r.def_id()).in_definition_order())
-            .filter_map(
-                |item| if item.kind == ty::AssocKind::Type { Some(item.name) } else { None },
-            )
+            .filter_map(|item| {
+                if item.opt_rpitit_info.is_none() && item.kind == ty::AssocKind::Type {
+                    Some(item.name)
+                } else {
+                    None
+                }
+            })
             .collect();
 
         if let (Some(suggested_name), true) = (
@@ -159,9 +163,13 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
             .flat_map(|trait_def_id| {
                 self.tcx().associated_items(*trait_def_id).in_definition_order()
             })
-            .filter_map(
-                |item| if item.kind == ty::AssocKind::Type { Some(item.name) } else { None },
-            )
+            .filter_map(|item| {
+                if item.opt_rpitit_info.is_none() && item.kind == ty::AssocKind::Type {
+                    Some(item.name)
+                } else {
+                    None
+                }
+            })
             .collect();
 
         if let (Some(suggested_name), true) = (

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

@@ -1049,6 +1049,7 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
                     }
 
                     ty::PredicateKind::Clause(ty::ClauseKind::WellFormed(ty)) => {
+                        let ty = self.resolve_vars_if_possible(ty);
                         match self.tcx.sess.opts.unstable_opts.trait_solver {
                             TraitSolver::Classic => {
                                 // WF predicates cannot themselves make

compiler/rustc_trait_selection/src/traits/wf.rs

@@ -77,12 +77,19 @@ pub fn unnormalized_obligations<'tcx>(
     param_env: ty::ParamEnv<'tcx>,
     arg: GenericArg<'tcx>,
 ) -> Option<Vec<traits::PredicateObligation<'tcx>>> {
+    debug_assert_eq!(arg, infcx.resolve_vars_if_possible(arg));
+
+    // However, if `arg` IS an unresolved inference variable, returns `None`,
+    // because we are not able to make any progress at all. This is to prevent
+    // "livelock" where we say "$0 is WF if $0 is WF".
+    if arg.is_non_region_infer() {
+        return None;
+    }
+
     if let ty::GenericArgKind::Lifetime(..) = arg.unpack() {
         return Some(vec![]);
     }
 
-    debug_assert_eq!(arg, infcx.resolve_vars_if_possible(arg));
-
     let mut wf = WfPredicates {
         infcx,
         param_env,

compiler/rustc_traits/src/evaluate_obligation.rs

@@ -1,6 +1,5 @@
 use rustc_infer::infer::TyCtxtInferExt;
 use rustc_middle::query::Providers;
-use rustc_middle::traits::DefiningAnchor;
 use rustc_middle::ty::{ParamEnvAnd, TyCtxt};
 use rustc_span::source_map::DUMMY_SP;
 use rustc_trait_selection::traits::query::CanonicalPredicateGoal;
@@ -18,12 +17,8 @@ fn evaluate_obligation<'tcx>(
 ) -> Result<EvaluationResult, OverflowError> {
     assert!(!tcx.next_trait_solver_globally());
     debug!("evaluate_obligation(canonical_goal={:#?})", canonical_goal);
-    // HACK This bubble is required for this tests to pass:
-    // impl-trait/issue99642.rs
-    let (ref infcx, goal, _canonical_inference_vars) = tcx
-        .infer_ctxt()
-        .with_opaque_type_inference(DefiningAnchor::Bubble)
-        .build_with_canonical(DUMMY_SP, &canonical_goal);
+    let (ref infcx, goal, _canonical_inference_vars) =
+        tcx.infer_ctxt().build_with_canonical(DUMMY_SP, &canonical_goal);
     debug!("evaluate_obligation: goal={:#?}", goal);
     let ParamEnvAnd { param_env, value: predicate } = goal;
 

compiler/rustc_traits/src/type_op.rs

@@ -2,7 +2,6 @@ use rustc_infer::infer::canonical::{Canonical, QueryResponse};
 use rustc_infer::infer::TyCtxtInferExt;
 use rustc_middle::query::Providers;
 use rustc_middle::traits::query::NoSolution;
-use rustc_middle::traits::DefiningAnchor;
 use rustc_middle::ty::{FnSig, Lift, PolyFnSig, Ty, TyCtxt, TypeFoldable};
 use rustc_middle::ty::{ParamEnvAnd, Predicate};
 use rustc_trait_selection::infer::InferCtxtBuilderExt;
@@ -106,15 +105,10 @@ fn type_op_prove_predicate<'tcx>(
     tcx: TyCtxt<'tcx>,
     canonicalized: Canonical<'tcx, ParamEnvAnd<'tcx, ProvePredicate<'tcx>>>,
 ) -> Result<&'tcx Canonical<'tcx, QueryResponse<'tcx, ()>>, NoSolution> {
-    // HACK This bubble is required for this test to pass:
-    // impl-trait/issue-99642.rs
-    tcx.infer_ctxt().with_opaque_type_inference(DefiningAnchor::Bubble).enter_canonical_trait_query(
-        &canonicalized,
-        |ocx, key| {
-            type_op_prove_predicate_with_cause(ocx, key, ObligationCause::dummy());
-            Ok(())
-        },
-    )
+    tcx.infer_ctxt().enter_canonical_trait_query(&canonicalized, |ocx, key| {
+        type_op_prove_predicate_with_cause(ocx, key, ObligationCause::dummy());
+        Ok(())
+    })
 }
 
 /// The core of the `type_op_prove_predicate` query: for diagnostics purposes in NLL HRTB errors,

library/std/Cargo.toml

@@ -18,7 +18,7 @@ panic_unwind = { path = "../panic_unwind", optional = true }
 panic_abort = { path = "../panic_abort" }
 core = { path = "../core", public = true }
 libc = { version = "0.2.146", default-features = false, features = ['rustc-dep-of-std'], public = true }
-compiler_builtins = { version = "0.1.92" }
+compiler_builtins = { version = "0.1.93" }
 profiler_builtins = { path = "../profiler_builtins", optional = true }
 unwind = { path = "../unwind" }
 hashbrown = { version = "0.14", default-features = false, features = ['rustc-dep-of-std'] }

library/std/src/sync/mpsc/mod.rs

@@ -347,8 +347,8 @@ pub struct Sender<T> {
 #[stable(feature = "rust1", since = "1.0.0")]
 unsafe impl<T: Send> Send for Sender<T> {}
 
-#[stable(feature = "rust1", since = "1.0.0")]
-impl<T> !Sync for Sender<T> {}
+#[stable(feature = "mpsc_sender_sync", since = "CURRENT_RUSTC_VERSION")]
+unsafe impl<T: Send> Sync for Sender<T> {}
 
 /// The sending-half of Rust's synchronous [`sync_channel`] type.
 ///