Rollup of 8 pull requests

compiler/rustc_borrowck/src/nll.rs

@@ -1,7 +1,7 @@
 //! The entry point of the NLL borrow checker.
 
 use rustc_data_structures::vec_map::VecMap;
-use rustc_hir::def_id::DefId;
+use rustc_hir::def_id::LocalDefId;
 use rustc_index::vec::IndexVec;
 use rustc_infer::infer::InferCtxt;
 use rustc_middle::mir::{create_dump_file, dump_enabled, dump_mir, PassWhere};
@@ -44,7 +44,7 @@ pub type PoloniusOutput = Output<RustcFacts>;
 /// closure requirements to propagate, and any generated errors.
 pub(crate) struct NllOutput<'tcx> {
     pub regioncx: RegionInferenceContext<'tcx>,
-    pub opaque_type_values: VecMap<DefId, OpaqueHiddenType<'tcx>>,
+    pub opaque_type_values: VecMap<LocalDefId, OpaqueHiddenType<'tcx>>,
     pub polonius_input: Option<Box<AllFacts>>,
     pub polonius_output: Option<Rc<PoloniusOutput>>,
     pub opt_closure_req: Option<ClosureRegionRequirements<'tcx>>,
@@ -373,7 +373,7 @@ pub(super) fn dump_annotation<'a, 'tcx>(
     body: &Body<'tcx>,
     regioncx: &RegionInferenceContext<'tcx>,
     closure_region_requirements: &Option<ClosureRegionRequirements<'_>>,
-    opaque_type_values: &VecMap<DefId, OpaqueHiddenType<'tcx>>,
+    opaque_type_values: &VecMap<LocalDefId, OpaqueHiddenType<'tcx>>,
     errors: &mut crate::error::BorrowckErrors<'tcx>,
 ) {
     let tcx = infcx.tcx;

compiler/rustc_borrowck/src/region_infer/opaque_types.rs

@@ -1,6 +1,6 @@
 use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::vec_map::VecMap;
-use rustc_hir::def_id::DefId;
+use rustc_hir::def_id::LocalDefId;
 use rustc_hir::OpaqueTyOrigin;
 use rustc_infer::infer::error_reporting::unexpected_hidden_region_diagnostic;
 use rustc_infer::infer::InferCtxt;
@@ -63,8 +63,8 @@ impl<'tcx> RegionInferenceContext<'tcx> {
         &self,
         infcx: &InferCtxt<'_, 'tcx>,
         opaque_ty_decls: VecMap<OpaqueTypeKey<'tcx>, (OpaqueHiddenType<'tcx>, OpaqueTyOrigin)>,
-    ) -> VecMap<DefId, OpaqueHiddenType<'tcx>> {
-        let mut result: VecMap<DefId, OpaqueHiddenType<'tcx>> = VecMap::new();
+    ) -> VecMap<LocalDefId, OpaqueHiddenType<'tcx>> {
+        let mut result: VecMap<LocalDefId, OpaqueHiddenType<'tcx>> = VecMap::new();
         for (opaque_type_key, (concrete_type, origin)) in opaque_ty_decls {
             let substs = opaque_type_key.substs;
             debug!(?concrete_type, ?substs);
@@ -235,7 +235,7 @@ impl<'a, 'tcx> InferCtxtExt<'tcx> for InferCtxt<'a, 'tcx> {
         // lifetimes with 'static and remapping only those used in the
         // `impl Trait` return type, resulting in the parameters
         // shifting.
-        let id_substs = InternalSubsts::identity_for_item(self.tcx, def_id);
+        let id_substs = InternalSubsts::identity_for_item(self.tcx, def_id.to_def_id());
         debug!(?id_substs);
         let map: FxHashMap<GenericArg<'tcx>, GenericArg<'tcx>> =
             substs.iter().enumerate().map(|(index, subst)| (subst, id_substs[index])).collect();
@@ -268,7 +268,7 @@ impl<'a, 'tcx> InferCtxtExt<'tcx> for InferCtxt<'a, 'tcx> {
             // This logic duplicates most of `check_opaque_meets_bounds`.
             // FIXME(oli-obk): Also do region checks here and then consider removing `check_opaque_meets_bounds` entirely.
             let param_env = self.tcx.param_env(def_id);
-            let body_id = self.tcx.local_def_id_to_hir_id(def_id.as_local().unwrap());
+            let body_id = self.tcx.local_def_id_to_hir_id(def_id);
             self.tcx.infer_ctxt().enter(move |infcx| {
                 // Require the hidden type to be well-formed with only the generics of the opaque type.
                 // Defining use functions may have more bounds than the opaque type, which is ok, as long as the
@@ -296,7 +296,7 @@ impl<'a, 'tcx> InferCtxtExt<'tcx> for InferCtxt<'a, 'tcx> {
                         infcx
                             .report_mismatched_types(
                                 &ObligationCause::misc(instantiated_ty.span, body_id),
-                                self.tcx.mk_opaque(def_id, id_substs),
+                                self.tcx.mk_opaque(def_id.to_def_id(), id_substs),
                                 definition_ty,
                                 err,
                             )
@@ -423,7 +423,7 @@ fn check_opaque_type_parameter_valid(
 struct ReverseMapper<'tcx> {
     tcx: TyCtxt<'tcx>,
 
-    opaque_type_def_id: DefId,
+    opaque_type_def_id: LocalDefId,
     map: FxHashMap<GenericArg<'tcx>, GenericArg<'tcx>>,
     map_missing_regions_to_empty: bool,
 
@@ -437,7 +437,7 @@ struct ReverseMapper<'tcx> {
 impl<'tcx> ReverseMapper<'tcx> {
     fn new(
         tcx: TyCtxt<'tcx>,
-        opaque_type_def_id: DefId,
+        opaque_type_def_id: LocalDefId,
         map: FxHashMap<GenericArg<'tcx>, GenericArg<'tcx>>,
         hidden_ty: Ty<'tcx>,
         span: Span,

compiler/rustc_error_codes/src/error_codes.rs

@@ -492,6 +492,7 @@ E0785: include_str!("./error_codes/E0785.md"),
 E0786: include_str!("./error_codes/E0786.md"),
 E0787: include_str!("./error_codes/E0787.md"),
 E0788: include_str!("./error_codes/E0788.md"),
+E0789: include_str!("./error_codes/E0789.md"),
 ;
 //  E0006, // merged with E0005
 //  E0008, // cannot bind by-move into a pattern guard

compiler/rustc_error_codes/src/error_codes/E0283.md

@@ -3,48 +3,27 @@ An implementation cannot be chosen unambiguously because of lack of information.
 Erroneous code example:
 
 ```compile_fail,E0283
-trait Generator {
-    fn create() -> u32;
-}
-
-struct Impl;
-
-impl Generator for Impl {
-    fn create() -> u32 { 1 }
-}
-
-struct AnotherImpl;
+struct Foo;
 
-impl Generator for AnotherImpl {
-    fn create() -> u32 { 2 }
+impl Into<u32> for Foo {
+    fn into(self) -> u32 { 1 }
 }
 
-fn main() {
-    let cont: u32 = Generator::create();
-    // error, impossible to choose one of Generator trait implementation
-    // Should it be Impl or AnotherImpl, maybe something else?
-}
+let foo = Foo;
+let bar: u32 = foo.into() * 1u32;
 ```
 
 This error can be solved by adding type annotations that provide the missing
-information to the compiler. In this case, the solution is to use a concrete
-type:
+information to the compiler. In this case, the solution is to specify the
+trait's type parameter:
 
 ```
-trait Generator {
-    fn create() -> u32;
-}
-
-struct AnotherImpl;
+struct Foo;
 
-impl Generator for AnotherImpl {
-    fn create() -> u32 { 2 }
+impl Into<u32> for Foo {
+    fn into(self) -> u32 { 1 }
 }
 
-fn main() {
-    let gen1 = AnotherImpl::create();
-
-    // if there are multiple methods with same name (different traits)
-    let gen2 = <AnotherImpl as Generator>::create();
-}
+let foo = Foo;
+let bar: u32 = Into::<u32>::into(foo) * 1u32;
 ```

compiler/rustc_error_codes/src/error_codes/E0789.md

@@ -0,0 +1,47 @@
+You need to specify a specific implementation of the trait in order to call the
+method.
+
+Erroneous code example:
+
+```compile_fail,E0789
+trait Generator {
+    fn create() -> u32;
+}
+
+struct Impl;
+
+impl Generator for Impl {
+    fn create() -> u32 { 1 }
+}
+
+struct AnotherImpl;
+
+impl Generator for AnotherImpl {
+    fn create() -> u32 { 2 }
+}
+
+let cont: u32 = Generator::create();
+// error, impossible to choose one of Generator trait implementation
+// Should it be Impl or AnotherImpl, maybe something else?
+```
+
+This error can be solved by adding type annotations that provide the missing
+information to the compiler. In this case, the solution is to use a concrete
+type:
+
+```
+trait Generator {
+    fn create() -> u32;
+}
+
+struct AnotherImpl;
+
+impl Generator for AnotherImpl {
+    fn create() -> u32 { 2 }
+}
+
+let gen1 = AnotherImpl::create();
+
+// if there are multiple methods with same name (different traits)
+let gen2 = <AnotherImpl as Generator>::create();
+```

compiler/rustc_error_messages/locales/en-US/lint.ftl

@@ -247,11 +247,6 @@ lint-atomic-ordering-invalid = `{$method}`'s failure ordering may not be `Releas
     .label = invalid failure ordering
     .help = consider using `Acquire` or `Relaxed` failure ordering instead
 
-lint-atomic-ordering-invalid-fail-success = `{$method}`'s success ordering must be at least as strong as its failure ordering
-    .fail-label = `{$fail_ordering}` failure ordering
-    .success-label = `{$success_ordering}` success ordering
-    .suggestion = consider using `{$success_suggestion}` success ordering instead
-
 lint-unused-op = unused {$op} that must be used
     .label = the {$op} produces a value
     .suggestion = use `let _ = ...` to ignore the resulting value

compiler/rustc_errors/src/emitter.rs

@@ -399,11 +399,11 @@ pub trait Emitter {
     ) {
         // Check for spans in macros, before `fix_multispans_in_extern_macros`
         // has a chance to replace them.
-        let has_macro_spans = iter::once(&*span)
+        let has_macro_spans: Vec<_> = iter::once(&*span)
             .chain(children.iter().map(|child| &child.span))
             .flat_map(|span| span.primary_spans())
             .flat_map(|sp| sp.macro_backtrace())
-            .find_map(|expn_data| {
+            .filter_map(|expn_data| {
                 match expn_data.kind {
                     ExpnKind::Root => None,
 
@@ -413,7 +413,8 @@ pub trait Emitter {
 
                     ExpnKind::Macro(macro_kind, name) => Some((macro_kind, name)),
                 }
-            });
+            })
+            .collect();
 
         if !backtrace {
             self.fix_multispans_in_extern_macros(source_map, span, children);
@@ -422,11 +423,22 @@ pub trait Emitter {
         self.render_multispans_macro_backtrace(span, children, backtrace);
 
         if !backtrace {
-            if let Some((macro_kind, name)) = has_macro_spans {
-                let descr = macro_kind.descr();
+            if let Some((macro_kind, name)) = has_macro_spans.first() {
+                // Mark the actual macro this originates from
+                let and_then = if let Some((macro_kind, last_name)) = has_macro_spans.last()
+                    && last_name != name
+                {
+                    let descr = macro_kind.descr();
+                    format!(
+                        " which comes from the expansion of the {descr} `{last_name}`",
+                    )
+                } else {
+                    "".to_string()
+                };
 
+                let descr = macro_kind.descr();
                 let msg = format!(
-                    "this {level} originates in the {descr} `{name}` \
+                    "this {level} originates in the {descr} `{name}`{and_then} \
                     (in Nightly builds, run with -Z macro-backtrace for more info)",
                 );
 

compiler/rustc_errors/src/lib.rs

@@ -6,6 +6,7 @@
 #![feature(drain_filter)]
 #![feature(backtrace)]
 #![feature(if_let_guard)]
+#![cfg_attr(bootstrap, feature(let_chains))]
 #![feature(let_else)]
 #![feature(never_type)]
 #![feature(adt_const_params)]

compiler/rustc_infer/src/infer/canonical/query_response.rs

@@ -153,7 +153,7 @@ impl<'cx, 'tcx> InferCtxt<'cx, 'tcx> {
             .opaque_type_storage
             .take_opaque_types()
             .into_iter()
-            .map(|(k, v)| (self.tcx.mk_opaque(k.def_id, k.substs), v.hidden_type.ty))
+            .map(|(k, v)| (self.tcx.mk_opaque(k.def_id.to_def_id(), k.substs), v.hidden_type.ty))
             .collect()
     }
 

compiler/rustc_infer/src/infer/mod.rs

@@ -938,7 +938,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
     #[instrument(skip(self), level = "debug")]
     pub fn member_constraint(
         &self,
-        opaque_type_def_id: DefId,
+        opaque_type_def_id: LocalDefId,
         definition_span: Span,
         hidden_ty: Ty<'tcx>,
         region: ty::Region<'tcx>,

compiler/rustc_infer/src/infer/opaque_types.rs

@@ -51,7 +51,11 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
             return InferOk { value: ty, obligations: vec![] };
         }
         let mut obligations = vec![];
-        let replace_opaque_type = |def_id| self.opaque_type_origin(def_id, span).is_some();
+        let replace_opaque_type = |def_id: DefId| {
+            def_id
+                .as_local()
+                .map_or(false, |def_id| self.opaque_type_origin(def_id, span).is_some())
+        };
         let value = ty.fold_with(&mut ty::fold::BottomUpFolder {
             tcx: self.tcx,
             lt_op: |lt| lt,
@@ -96,6 +100,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
         let (a, b) = if a_is_expected { (a, b) } else { (b, a) };
         let process = |a: Ty<'tcx>, b: Ty<'tcx>| match *a.kind() {
             ty::Opaque(def_id, substs) if def_id.is_local() => {
+                let def_id = def_id.expect_local();
                 let origin = if self.defining_use_anchor.is_some() {
                     // Check that this is `impl Trait` type is
                     // declared by `parent_def_id` -- i.e., one whose
@@ -141,7 +146,8 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
                     // no one encounters it in practice.
                     // It does occur however in `fn fut() -> impl Future<Output = i32> { async { 42 } }`,
                     // where it is of no concern, so we only check for TAITs.
-                    if let Some(OpaqueTyOrigin::TyAlias) = self.opaque_type_origin(did2, cause.span)
+                    if let Some(OpaqueTyOrigin::TyAlias) =
+                        did2.as_local().and_then(|did2| self.opaque_type_origin(did2, cause.span))
                     {
                         self.tcx
                                 .sess
@@ -399,8 +405,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
     }
 
     #[instrument(skip(self), level = "trace")]
-    pub fn opaque_type_origin(&self, opaque_def_id: DefId, span: Span) -> Option<OpaqueTyOrigin> {
-        let def_id = opaque_def_id.as_local()?;
+    pub fn opaque_type_origin(&self, def_id: LocalDefId, span: Span) -> Option<OpaqueTyOrigin> {
         let opaque_hir_id = self.tcx.hir().local_def_id_to_hir_id(def_id);
         let parent_def_id = self.defining_use_anchor?;
         let item_kind = &self.tcx.hir().expect_item(def_id).kind;
@@ -409,7 +414,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
             span_bug!(
                 span,
                 "weird opaque type: {:#?}, {:#?}",
-                opaque_def_id,
+                def_id,
                 item_kind
             )
         };
@@ -428,12 +433,11 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
     }
 
     #[instrument(skip(self), level = "trace")]
-    fn opaque_ty_origin_unchecked(&self, opaque_def_id: DefId, span: Span) -> OpaqueTyOrigin {
-        let def_id = opaque_def_id.as_local().unwrap();
+    fn opaque_ty_origin_unchecked(&self, def_id: LocalDefId, span: Span) -> OpaqueTyOrigin {
         let origin = match self.tcx.hir().expect_item(def_id).kind {
             hir::ItemKind::OpaqueTy(hir::OpaqueTy { origin, .. }) => origin,
             ref itemkind => {
-                span_bug!(span, "weird opaque type: {:?}, {:#?}", opaque_def_id, itemkind)
+                span_bug!(span, "weird opaque type: {:?}, {:#?}", def_id, itemkind)
             }
         };
         trace!(?origin);
@@ -557,7 +561,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
             obligations = self.at(&cause, param_env).eq(prev, hidden_ty)?.obligations;
         }
 
-        let item_bounds = tcx.bound_explicit_item_bounds(def_id);
+        let item_bounds = tcx.bound_explicit_item_bounds(def_id.to_def_id());
 
         for predicate in item_bounds.transpose_iter().map(|e| e.map_bound(|(p, _)| *p)) {
             debug!(?predicate);
@@ -579,7 +583,9 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
                     }
                     // Replace all other mentions of the same opaque type with the hidden type,
                     // as the bounds must hold on the hidden type after all.
-                    ty::Opaque(def_id2, substs2) if def_id == def_id2 && substs == substs2 => {
+                    ty::Opaque(def_id2, substs2)
+                        if def_id.to_def_id() == def_id2 && substs == substs2 =>
+                    {
                         hidden_ty
                     }
                     _ => ty,

compiler/rustc_infer/src/infer/region_constraints/mod.rs

@@ -12,7 +12,7 @@ use rustc_data_structures::intern::Interned;
 use rustc_data_structures::sync::Lrc;
 use rustc_data_structures::undo_log::UndoLogs;
 use rustc_data_structures::unify as ut;
-use rustc_hir::def_id::DefId;
+use rustc_hir::def_id::LocalDefId;
 use rustc_index::vec::IndexVec;
 use rustc_middle::infer::unify_key::{RegionVidKey, UnifiedRegion};
 use rustc_middle::ty::ReStatic;
@@ -533,7 +533,7 @@ impl<'tcx> RegionConstraintCollector<'_, 'tcx> {
 
     pub fn member_constraint(
         &mut self,
-        opaque_type_def_id: DefId,
+        opaque_type_def_id: LocalDefId,
         definition_span: Span,
         hidden_ty: Ty<'tcx>,
         member_region: ty::Region<'tcx>,