Rollup of 8 pull requests

.github/workflows/ci.yml

@@ -110,11 +110,7 @@ jobs:
       # less disk space.
       - name: free up disk space
         uses: jlumbroso/free-disk-space@54081f138730dfa15788a46383842cd2f914a1be
-        if: contains(matrix.os, 'ubuntu')
-        with:
-          # Removing packages with APT saves ~5 GiB, but takes several
-          # minutes (and potentially removes important packages).
-          large-packages: false
+        if: matrix.free_disk
 
       # Rust Log Analyzer can't currently detect the PR number of a GitHub
       # Actions build on its own, so a hint in the log message is needed to

compiler/rustc_ast/src/attr/mod.rs

@@ -136,13 +136,35 @@ impl Attribute {
         }
     }
 
+    /// Returns a list of meta items if the attribute is delimited with parenthesis:
+    ///
+    /// ```text
+    /// #[attr(a, b = "c")] // Returns `Some()`.
+    /// #[attr = ""] // Returns `None`.
+    /// #[attr] // Returns `None`.
+    /// ```
     pub fn meta_item_list(&self) -> Option<ThinVec<MetaItemInner>> {
         match &self.kind {
             AttrKind::Normal(normal) => normal.item.meta_item_list(),
             AttrKind::DocComment(..) => None,
         }
     }
 
+    /// Returns the string value in:
+    ///
+    /// ```text
+    /// #[attribute = "value"]
+    ///               ^^^^^^^
+    /// ```
+    ///
+    /// It returns `None` in any other cases, including doc comments if they
+    /// are not under the form `#[doc = "..."]`.
+    ///
+    /// It also returns `None` for:
+    ///
+    /// ```text
+    /// #[attr("value")]
+    /// ```
     pub fn value_str(&self) -> Option<Symbol> {
         match &self.kind {
             AttrKind::Normal(normal) => normal.item.value_str(),
@@ -232,6 +254,18 @@ impl AttrItem {
         }
     }
 
+    /// Returns the string value in:
+    ///
+    /// ```text
+    /// #[attribute = "value"]
+    ///               ^^^^^^^
+    /// ```
+    ///
+    /// It returns `None` in any other cases like:
+    ///
+    /// ```text
+    /// #[attr("value")]
+    /// ```
     fn value_str(&self) -> Option<Symbol> {
         match &self.args {
             AttrArgs::Eq(_, args) => args.value_str(),
@@ -315,6 +349,18 @@ impl MetaItem {
         Some(self.name_value_literal()?.span)
     }
 
+    /// Returns the string value in:
+    ///
+    /// ```text
+    /// #[attribute = "value"]
+    ///               ^^^^^^^
+    /// ```
+    ///
+    /// It returns `None` in any other cases like:
+    ///
+    /// ```text
+    /// #[attr("value")]
+    /// ```
     pub fn value_str(&self) -> Option<Symbol> {
         match &self.kind {
             MetaItemKind::NameValue(v) => v.kind.str(),

compiler/rustc_codegen_llvm/src/attributes.rs

@@ -419,7 +419,10 @@ pub(crate) fn llfn_attrs_from_instance<'ll, 'tcx>(
                 if bti {
                     to_add.push(llvm::CreateAttrString(cx.llcx, "branch-target-enforcement"));
                 }
-                if let Some(PacRet { leaf, key }) = pac_ret {
+                if let Some(PacRet { leaf, pc, key }) = pac_ret {
+                    if pc {
+                        to_add.push(llvm::CreateAttrString(cx.llcx, "branch-protection-pauth-lr"));
+                    }
                     to_add.push(llvm::CreateAttrStringValue(
                         cx.llcx,
                         "sign-return-address",

compiler/rustc_codegen_llvm/src/context.rs

@@ -308,7 +308,13 @@ pub(crate) unsafe fn create_module<'ll>(
                 "sign-return-address",
                 pac_ret.is_some().into(),
             );
-            let pac_opts = pac_ret.unwrap_or(PacRet { leaf: false, key: PAuthKey::A });
+            let pac_opts = pac_ret.unwrap_or(PacRet { leaf: false, pc: false, key: PAuthKey::A });
+            llvm::add_module_flag_u32(
+                llmod,
+                llvm::ModuleFlagMergeBehavior::Min,
+                "branch-protection-pauth-lr",
+                pac_opts.pc.into(),
+            );
             llvm::add_module_flag_u32(
                 llmod,
                 llvm::ModuleFlagMergeBehavior::Min,

compiler/rustc_interface/src/tests.rs

@@ -764,7 +764,7 @@ fn test_unstable_options_tracking_hash() {
         branch_protection,
         Some(BranchProtection {
             bti: true,
-            pac_ret: Some(PacRet { leaf: true, key: PAuthKey::B })
+            pac_ret: Some(PacRet { leaf: true, pc: true, key: PAuthKey::B })
         })
     );
     tracked!(codegen_backend, Some("abc".to_string()));

compiler/rustc_lint/src/late.rs

@@ -422,6 +422,9 @@ fn late_lint_crate<'tcx>(tcx: TyCtxt<'tcx>) {
         .into_iter()
         .filter(|pass| {
             let lints = (**pass).get_lints();
+            // Lintless passes are always in
+            lints.is_empty() ||
+            // If the pass doesn't have a single needed lint, omit it
             !lints.iter().all(|lint| lints_that_dont_need_to_run.contains(&LintId::of(lint)))
         })
         .collect();

compiler/rustc_resolve/src/late/diagnostics.rs

@@ -459,7 +459,7 @@ impl<'ast, 'ra: 'ast, 'tcx> LateResolutionVisitor<'_, 'ast, 'ra, 'tcx> {
             return (err, Vec::new());
         }
 
-        let (found, mut candidates) = self.try_lookup_name_relaxed(
+        let (found, suggested_candidates, mut candidates) = self.try_lookup_name_relaxed(
             &mut err,
             source,
             path,
@@ -478,7 +478,15 @@ impl<'ast, 'ra: 'ast, 'tcx> LateResolutionVisitor<'_, 'ast, 'ra, 'tcx> {
         }
 
         let mut fallback = self.suggest_trait_and_bounds(&mut err, source, res, span, &base_error);
-        fallback |= self.suggest_typo(&mut err, source, path, following_seg, span, &base_error);
+        fallback |= self.suggest_typo(
+            &mut err,
+            source,
+            path,
+            following_seg,
+            span,
+            &base_error,
+            suggested_candidates,
+        );
 
         if fallback {
             // Fallback label.
@@ -589,7 +597,16 @@ impl<'ast, 'ra: 'ast, 'tcx> LateResolutionVisitor<'_, 'ast, 'ra, 'tcx> {
         span: Span,
         res: Option<Res>,
         base_error: &BaseError,
-    ) -> (bool, Vec<ImportSuggestion>) {
+    ) -> (bool, FxHashSet<String>, Vec<ImportSuggestion>) {
+        let span = match following_seg {
+            Some(_) if path[0].ident.span.eq_ctxt(path[path.len() - 1].ident.span) => {
+                // The path `span` that comes in includes any following segments, which we don't
+                // want to replace in the suggestions.
+                path[0].ident.span.to(path[path.len() - 1].ident.span)
+            }
+            _ => span,
+        };
+        let mut suggested_candidates = FxHashSet::default();
         // Try to lookup name in more relaxed fashion for better error reporting.
         let ident = path.last().unwrap().ident;
         let is_expected = &|res| source.is_expected(res);
@@ -646,6 +663,11 @@ impl<'ast, 'ra: 'ast, 'tcx> LateResolutionVisitor<'_, 'ast, 'ra, 'tcx> {
                 };
                 let msg = format!("{preamble}try using the variant's enum");
 
+                suggested_candidates.extend(
+                    enum_candidates
+                        .iter()
+                        .map(|(_variant_path, enum_ty_path)| enum_ty_path.clone()),
+                );
                 err.span_suggestions(
                     span,
                     msg,
@@ -658,7 +680,8 @@ impl<'ast, 'ra: 'ast, 'tcx> LateResolutionVisitor<'_, 'ast, 'ra, 'tcx> {
         // Try finding a suitable replacement.
         let typo_sugg = self
             .lookup_typo_candidate(path, following_seg, source.namespace(), is_expected)
-            .to_opt_suggestion();
+            .to_opt_suggestion()
+            .filter(|sugg| !suggested_candidates.contains(sugg.candidate.as_str()));
         if let [segment] = path
             && !matches!(source, PathSource::Delegation)
             && self.self_type_is_available()
@@ -719,7 +742,7 @@ impl<'ast, 'ra: 'ast, 'tcx> LateResolutionVisitor<'_, 'ast, 'ra, 'tcx> {
                     }
                 }
                 self.r.add_typo_suggestion(err, typo_sugg, ident_span);
-                return (true, candidates);
+                return (true, suggested_candidates, candidates);
             }
 
             // If the first argument in call is `self` suggest calling a method.
@@ -737,7 +760,7 @@ impl<'ast, 'ra: 'ast, 'tcx> LateResolutionVisitor<'_, 'ast, 'ra, 'tcx> {
                     format!("self.{path_str}({args_snippet})"),
                     Applicability::MachineApplicable,
                 );
-                return (true, candidates);
+                return (true, suggested_candidates, candidates);
             }
         }
 
@@ -754,7 +777,7 @@ impl<'ast, 'ra: 'ast, 'tcx> LateResolutionVisitor<'_, 'ast, 'ra, 'tcx> {
             ) {
                 // We do this to avoid losing a secondary span when we override the main error span.
                 self.r.add_typo_suggestion(err, typo_sugg, ident_span);
-                return (true, candidates);
+                return (true, suggested_candidates, candidates);
             }
         }
 
@@ -772,7 +795,7 @@ impl<'ast, 'ra: 'ast, 'tcx> LateResolutionVisitor<'_, 'ast, 'ra, 'tcx> {
                         ident.span,
                         format!("the binding `{path_str}` is available in a different scope in the same function"),
                     );
-                    return (true, candidates);
+                    return (true, suggested_candidates, candidates);
                 }
             }
         }
@@ -781,7 +804,7 @@ impl<'ast, 'ra: 'ast, 'tcx> LateResolutionVisitor<'_, 'ast, 'ra, 'tcx> {
             candidates = self.smart_resolve_partial_mod_path_errors(path, following_seg);
         }
 
-        (false, candidates)
+        (false, suggested_candidates, candidates)
     }
 
     fn suggest_trait_and_bounds(
@@ -869,13 +892,16 @@ impl<'ast, 'ra: 'ast, 'tcx> LateResolutionVisitor<'_, 'ast, 'ra, 'tcx> {
         following_seg: Option<&Segment>,
         span: Span,
         base_error: &BaseError,
+        suggested_candidates: FxHashSet<String>,
     ) -> bool {
         let is_expected = &|res| source.is_expected(res);
         let ident_span = path.last().map_or(span, |ident| ident.ident.span);
         let typo_sugg =
             self.lookup_typo_candidate(path, following_seg, source.namespace(), is_expected);
         let mut fallback = false;
-        let typo_sugg = typo_sugg.to_opt_suggestion();
+        let typo_sugg = typo_sugg
+            .to_opt_suggestion()
+            .filter(|sugg| !suggested_candidates.contains(sugg.candidate.as_str()));
         if !self.r.add_typo_suggestion(err, typo_sugg, ident_span) {
             fallback = true;
             match self.diag_metadata.current_let_binding {
@@ -894,10 +920,13 @@ impl<'ast, 'ra: 'ast, 'tcx> LateResolutionVisitor<'_, 'ast, 'ra, 'tcx> {
 
             // If the trait has a single item (which wasn't matched by the algorithm), suggest it
             let suggestion = self.get_single_associated_item(path, &source, is_expected);
-            if !self.r.add_typo_suggestion(err, suggestion, ident_span) {
-                fallback = !self.let_binding_suggestion(err, ident_span);
-            }
+            self.r.add_typo_suggestion(err, suggestion, ident_span);
         }
+
+        if self.let_binding_suggestion(err, ident_span) {
+            fallback = false;
+        }
+
         fallback
     }
 

compiler/rustc_session/src/config.rs

@@ -1320,6 +1320,7 @@ pub enum PAuthKey {
 #[derive(Clone, Copy, Hash, Debug, PartialEq)]
 pub struct PacRet {
     pub leaf: bool,
+    pub pc: bool,
     pub key: PAuthKey,
 }
 

compiler/rustc_session/src/options.rs

@@ -442,8 +442,7 @@ mod desc {
     pub(crate) const parse_polonius: &str = "either no value or `legacy` (the default), or `next`";
     pub(crate) const parse_stack_protector: &str =
         "one of (`none` (default), `basic`, `strong`, or `all`)";
-    pub(crate) const parse_branch_protection: &str =
-        "a `,` separated combination of `bti`, `b-key`, `pac-ret`, or `leaf`";
+    pub(crate) const parse_branch_protection: &str = "a `,` separated combination of `bti`, `pac-ret`, followed by a combination of `pc`, `b-key`, or `leaf`";
     pub(crate) const parse_proc_macro_execution_strategy: &str =
         "one of supported execution strategies (`same-thread`, or `cross-thread`)";
     pub(crate) const parse_remap_path_scope: &str =
@@ -1401,7 +1400,7 @@ pub mod parse {
                     match opt {
                         "bti" => slot.bti = true,
                         "pac-ret" if slot.pac_ret.is_none() => {
-                            slot.pac_ret = Some(PacRet { leaf: false, key: PAuthKey::A })
+                            slot.pac_ret = Some(PacRet { leaf: false, pc: false, key: PAuthKey::A })
                         }
                         "leaf" => match slot.pac_ret.as_mut() {
                             Some(pac) => pac.leaf = true,
@@ -1411,6 +1410,10 @@ pub mod parse {
                             Some(pac) => pac.key = PAuthKey::B,
                             _ => return false,
                         },
+                        "pc" => match slot.pac_ret.as_mut() {
+                            Some(pac) => pac.pc = true,
+                            _ => return false,
+                        },
                         _ => return false,
                     };
                 }

library/core/src/char/methods.rs

@@ -1,7 +1,7 @@
 //! impl char {}
 
 use super::*;
-use crate::macros::const_panic;
+use crate::panic::const_panic;
 use crate::slice;
 use crate::str::from_utf8_unchecked_mut;
 use crate::unicode::printable::is_printable;