Rollup of 9 pull requests

compiler/rustc_ast_lowering/src/item.rs

@@ -1366,7 +1366,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
         generics: &Generics,
         itctx: ImplTraitContext<'_, 'hir>,
     ) -> GenericsCtor<'hir> {
-        // Error if `?Trait` bounds in where clauses don't refer directly to type paramters.
+        // Error if `?Trait` bounds in where clauses don't refer directly to type parameters.
         // Note: we used to clone these bounds directly onto the type parameter (and avoid lowering
         // these into hir when we lower thee where clauses), but this makes it quite difficult to
         // keep track of the Span info. Now, `add_implicitly_sized` in `AstConv` checks both param bounds and

compiler/rustc_borrowck/src/region_infer/mod.rs

@@ -1992,7 +1992,7 @@ impl<'tcx> RegionInferenceContext<'tcx> {
             .find_map(|constraint| {
                 if let ConstraintCategory::Predicate(predicate_span) = constraint.category {
                     // We currentl'y doesn't store the `DefId` in the `ConstraintCategory`
-                    // for perforamnce reasons. The error reporting code used by NLL only
+                    // for performances reasons. The error reporting code used by NLL only
                     // uses the span, so this doesn't cause any problems at the moment.
                     Some(ObligationCauseCode::BindingObligation(
                         CRATE_DEF_ID.to_def_id(),

compiler/rustc_builtin_macros/src/cfg_eval.rs

@@ -201,7 +201,7 @@ impl CfgEval<'_, '_> {
 
         // Re-parse the tokens, setting the `capture_cfg` flag to save extra information
         // to the captured `AttrAnnotatedTokenStream` (specifically, we capture
-        // `AttrAnnotatedTokenTree::AttributesData` for all occurences of `#[cfg]` and `#[cfg_attr]`)
+        // `AttrAnnotatedTokenTree::AttributesData` for all occurrences of `#[cfg]` and `#[cfg_attr]`)
         let mut parser =
             rustc_parse::stream_to_parser(&self.cfg.sess.parse_sess, orig_tokens, None);
         parser.capture_cfg = true;

compiler/rustc_codegen_ssa/src/back/link.rs

@@ -989,7 +989,7 @@ fn link_natively<'a, B: ArchiveBuilder<'a>>(
 
         // ... and otherwise we're processing a `*.dwp` packed dwarf file.
         //
-        // We cannot rely on the .o paths in the exectuable because they may have been
+        // We cannot rely on the .o paths in the executable because they may have been
         // remapped by --remap-path-prefix and therefore invalid, so we need to provide
         // the .o/.dwo paths explicitly.
         SplitDebuginfo::Packed => link_dwarf_object(sess, codegen_results, out_filename),

compiler/rustc_codegen_ssa/src/back/linker.rs

@@ -1338,7 +1338,7 @@ impl<'a> Linker for WasmLd<'a> {
         }
 
         // LLD will hide these otherwise-internal symbols since it only exports
-        // symbols explicity passed via the `--export` flags above and hides all
+        // symbols explicitly passed via the `--export` flags above and hides all
         // others. Various bits and pieces of tooling use this, so be sure these
         // symbols make their way out of the linker as well.
         self.cmd.arg("--export=__heap_base");

compiler/rustc_data_structures/src/sso/either_iter.rs

@@ -7,7 +7,7 @@ use std::iter::Iterator;
 /// one of two specific implementations.
 ///
 /// Note: For most methods providing custom
-///       implementation may margianlly
+///       implementation may marginally
 ///       improve performance by avoiding
 ///       doing Left/Right match on every step
 ///       and doing it only once instead.

compiler/rustc_hir/src/definitions.rs

@@ -50,7 +50,7 @@ impl DefPathTable {
             // Continuing with colliding DefPathHashes can lead to correctness
             // issues. We must abort compilation.
             //
-            // The likelyhood of such a collision is very small, so actually
+            // The likelihood of such a collision is very small, so actually
             // running into one could be indicative of a poor hash function
             // being used.
             //

compiler/rustc_infer/src/infer/error_reporting/nice_region_error/different_lifetimes.rs

@@ -166,59 +166,61 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> {
             if lifetime_sub.name.is_elided() && lifetime_sup.name.is_elided() {
                 if let Some(anon_reg) = self.tcx().is_suitable_region(sub) {
                     let hir_id = self.tcx().hir().local_def_id_to_hir_id(anon_reg.def_id);
-                    if let hir::Node::Item(&hir::Item {
-                        kind: hir::ItemKind::Fn(_, ref generics, ..),
-                        ..
-                    }) = self.tcx().hir().get(hir_id)
-                    {
-                        let (suggestion_param_name, introduce_new) = generics
-                            .params
-                            .iter()
-                            .find(|p| matches!(p.kind, GenericParamKind::Lifetime { .. }))
-                            .and_then(|p| self.tcx().sess.source_map().span_to_snippet(p.span).ok())
-                            .map(|name| (name, false))
-                            .unwrap_or_else(|| ("'a".to_string(), true));
-
-                        let mut suggestions = vec![
-                            if let hir::LifetimeName::Underscore = lifetime_sub.name {
-                                (lifetime_sub.span, suggestion_param_name.clone())
-                            } else {
-                                (
-                                    lifetime_sub.span.shrink_to_hi(),
-                                    suggestion_param_name.clone() + " ",
-                                )
-                            },
-                            if let hir::LifetimeName::Underscore = lifetime_sup.name {
-                                (lifetime_sup.span, suggestion_param_name.clone())
-                            } else {
-                                (
-                                    lifetime_sup.span.shrink_to_hi(),
-                                    suggestion_param_name.clone() + " ",
-                                )
-                            },
-                        ];
-
-                        if introduce_new {
-                            let new_param_suggestion = match &generics.params {
-                                [] => (generics.span, format!("<{}>", suggestion_param_name)),
-                                [first, ..] => (
-                                    first.span.shrink_to_lo(),
-                                    format!("{}, ", suggestion_param_name),
-                                ),
-                            };
-
-                            suggestions.push(new_param_suggestion);
-                        }
-
-                        err.multipart_suggestion(
-                            "consider introducing a named lifetime parameter",
-                            suggestions,
-                            Applicability::MaybeIncorrect,
-                        );
-                        err.note(
-                            "each elided lifetime in input position becomes a distinct lifetime",
-                        );
+
+                    let node = self.tcx().hir().get(hir_id);
+                    let is_impl = matches!(&node, hir::Node::ImplItem(_));
+                    let generics = match node {
+                        hir::Node::Item(&hir::Item {
+                            kind: hir::ItemKind::Fn(_, ref generics, ..),
+                            ..
+                        })
+                        | hir::Node::TraitItem(&hir::TraitItem { ref generics, .. })
+                        | hir::Node::ImplItem(&hir::ImplItem { ref generics, .. }) => generics,
+                        _ => return,
+                    };
+
+                    let (suggestion_param_name, introduce_new) = generics
+                        .params
+                        .iter()
+                        .find(|p| matches!(p.kind, GenericParamKind::Lifetime { .. }))
+                        .and_then(|p| self.tcx().sess.source_map().span_to_snippet(p.span).ok())
+                        .map(|name| (name, false))
+                        .unwrap_or_else(|| ("'a".to_string(), true));
+
+                    let mut suggestions = vec![
+                        if let hir::LifetimeName::Underscore = lifetime_sub.name {
+                            (lifetime_sub.span, suggestion_param_name.clone())
+                        } else {
+                            (lifetime_sub.span.shrink_to_hi(), suggestion_param_name.clone() + " ")
+                        },
+                        if let hir::LifetimeName::Underscore = lifetime_sup.name {
+                            (lifetime_sup.span, suggestion_param_name.clone())
+                        } else {
+                            (lifetime_sup.span.shrink_to_hi(), suggestion_param_name.clone() + " ")
+                        },
+                    ];
+
+                    if introduce_new {
+                        let new_param_suggestion = match &generics.params {
+                            [] => (generics.span, format!("<{}>", suggestion_param_name)),
+                            [first, ..] => {
+                                (first.span.shrink_to_lo(), format!("{}, ", suggestion_param_name))
+                            }
+                        };
+
+                        suggestions.push(new_param_suggestion);
+                    }
+
+                    let mut sugg = String::from("consider introducing a named lifetime parameter");
+                    if is_impl {
+                        sugg.push_str(" and update trait if needed");
                     }
+                    err.multipart_suggestion(
+                        sugg.as_str(),
+                        suggestions,
+                        Applicability::MaybeIncorrect,
+                    );
+                    err.note("each elided lifetime in input position becomes a distinct lifetime");
                 }
             }
         }

compiler/rustc_mir_transform/src/const_debuginfo.rs

@@ -55,10 +55,8 @@ fn find_optimization_oportunities<'tcx>(body: &Body<'tcx>) -> Vec<(Local, Consta
 
     let mut locals_to_debuginfo = BitSet::new_empty(body.local_decls.len());
     for debuginfo in &body.var_debug_info {
-        if let VarDebugInfoContents::Place(p) = debuginfo.value {
-            if let Some(l) = p.as_local() {
-                locals_to_debuginfo.insert(l);
-            }
+        if let VarDebugInfoContents::Place(p) = debuginfo.value && let Some(l) = p.as_local() {
+            locals_to_debuginfo.insert(l);
         }
     }
 

compiler/rustc_mir_transform/src/const_prop.rs

@@ -633,24 +633,22 @@ impl<'mir, 'tcx> ConstPropagator<'mir, 'tcx> {
     fn propagate_operand(&mut self, operand: &mut Operand<'tcx>) {
         match *operand {
             Operand::Copy(l) | Operand::Move(l) => {
-                if let Some(value) = self.get_const(l) {
-                    if self.should_const_prop(&value) {
-                        // FIXME(felix91gr): this code only handles `Scalar` cases.
-                        // For now, we're not handling `ScalarPair` cases because
-                        // doing so here would require a lot of code duplication.
-                        // We should hopefully generalize `Operand` handling into a fn,
-                        // and use it to do const-prop here and everywhere else
-                        // where it makes sense.
-                        if let interpret::Operand::Immediate(interpret::Immediate::Scalar(
-                            ScalarMaybeUninit::Scalar(scalar),
-                        )) = *value
-                        {
-                            *operand = self.operand_from_scalar(
-                                scalar,
-                                value.layout.ty,
-                                self.source_info.unwrap().span,
-                            );
-                        }
+                if let Some(value) = self.get_const(l) && self.should_const_prop(&value) {
+                    // FIXME(felix91gr): this code only handles `Scalar` cases.
+                    // For now, we're not handling `ScalarPair` cases because
+                    // doing so here would require a lot of code duplication.
+                    // We should hopefully generalize `Operand` handling into a fn,
+                    // and use it to do const-prop here and everywhere else
+                    // where it makes sense.
+                    if let interpret::Operand::Immediate(interpret::Immediate::Scalar(
+                        ScalarMaybeUninit::Scalar(scalar),
+                    )) = *value
+                    {
+                        *operand = self.operand_from_scalar(
+                            scalar,
+                            value.layout.ty,
+                            self.source_info.unwrap().span,
+                        );
                     }
                 }
             }
@@ -1086,15 +1084,13 @@ impl<'tcx> MutVisitor<'tcx> for ConstPropagator<'_, 'tcx> {
                 // This will return None if the above `const_prop` invocation only "wrote" a
                 // type whose creation requires no write. E.g. a generator whose initial state
                 // consists solely of uninitialized memory (so it doesn't capture any locals).
-                if let Some(ref value) = self.get_const(place) {
-                    if self.should_const_prop(value) {
-                        trace!("replacing {:?} with {:?}", rval, value);
-                        self.replace_with_const(rval, value, source_info);
-                        if can_const_prop == ConstPropMode::FullConstProp
-                            || can_const_prop == ConstPropMode::OnlyInsideOwnBlock
-                        {
-                            trace!("propagated into {:?}", place);
-                        }
+                if let Some(ref value) = self.get_const(place) && self.should_const_prop(value) {
+                    trace!("replacing {:?} with {:?}", rval, value);
+                    self.replace_with_const(rval, value, source_info);
+                    if can_const_prop == ConstPropMode::FullConstProp
+                        || can_const_prop == ConstPropMode::OnlyInsideOwnBlock
+                    {
+                        trace!("propagated into {:?}", place);
                     }
                 }
                 match can_const_prop {

compiler/rustc_mir_transform/src/coverage/debug.rs

@@ -357,14 +357,12 @@ impl DebugCounters {
         if let Some(counters) = &self.some_counters {
             if let Some(DebugCounter { counter_kind, some_block_label }) = counters.get(&operand) {
                 if let CoverageKind::Expression { .. } = counter_kind {
-                    if let Some(block_label) = some_block_label {
-                        if debug_options().counter_format.block {
-                            return format!(
-                                "{}:({})",
-                                block_label,
-                                self.format_counter_kind(counter_kind)
-                            );
-                        }
+                    if let Some(label) = some_block_label && debug_options().counter_format.block {
+                        return format!(
+                            "{}:({})",
+                            label,
+                            self.format_counter_kind(counter_kind)
+                        );
                     }
                     return format!("({})", self.format_counter_kind(counter_kind));
                 }

compiler/rustc_mir_transform/src/coverage/spans.rs

@@ -191,16 +191,13 @@ impl CoverageSpan {
     /// If the span is part of a macro, and the macro is visible (expands directly to the given
     /// body_span), returns the macro name symbol.
     pub fn visible_macro(&self, body_span: Span) -> Option<Symbol> {
-        if let Some(current_macro) = self.current_macro() {
-            if self
-                .expn_span
-                .parent_callsite()
-                .unwrap_or_else(|| bug!("macro must have a parent"))
-                .ctxt()
-                == body_span.ctxt()
-            {
-                return Some(current_macro);
-            }
+        if let Some(current_macro) = self.current_macro() && self
+            .expn_span
+            .parent_callsite()
+            .unwrap_or_else(|| bug!("macro must have a parent"))
+            .ctxt() == body_span.ctxt()
+        {
+            return Some(current_macro);
         }
         None
     }
@@ -584,21 +581,19 @@ impl<'a, 'tcx> CoverageSpans<'a, 'tcx> {
     /// In either case, no more spans will match the span of `pending_dups`, so
     /// add the `pending_dups` if they don't overlap `curr`, and clear the list.
     fn check_pending_dups(&mut self) {
-        if let Some(dup) = self.pending_dups.last() {
-            if dup.span != self.prev().span {
-                debug!(
-                    "    SAME spans, but pending_dups are NOT THE SAME, so BCBs matched on \
-                    previous iteration, or prev started a new disjoint span"
-                );
-                if dup.span.hi() <= self.curr().span.lo() {
-                    let pending_dups = self.pending_dups.split_off(0);
-                    for dup in pending_dups.into_iter() {
-                        debug!("    ...adding at least one pending={:?}", dup);
-                        self.push_refined_span(dup);
-                    }
-                } else {
-                    self.pending_dups.clear();
+        if let Some(dup) = self.pending_dups.last() && dup.span != self.prev().span {
+            debug!(
+                "    SAME spans, but pending_dups are NOT THE SAME, so BCBs matched on \
+                previous iteration, or prev started a new disjoint span"
+            );
+            if dup.span.hi() <= self.curr().span.lo() {
+                let pending_dups = self.pending_dups.split_off(0);
+                for dup in pending_dups.into_iter() {
+                    debug!("    ...adding at least one pending={:?}", dup);
+                    self.push_refined_span(dup);
                 }
+            } else {
+                self.pending_dups.clear();
             }
         }
     }