Auto merge of #92062 - matthiaskrgr:rollup-en3p4sb, r=matthiaskrgr

Rollup of 7 pull requests

Successful merges:

 - #91439 (Mark defaulted `PartialEq`/`PartialOrd` methods as const)
 - #91516 (Improve suggestion to change struct field to &mut)
 - #91896 (Remove `in_band_lifetimes` for `rustc_passes`)
 - #91909 (⬆ rust-analyzer)
 - #91922 (Remove `in_band_lifetimes` from `rustc_mir_dataflow`)
 - #92025 (Revert "socket ancillary data implementation for dragonflybsd.")
 - #92030 (Update stdlib to the 2021 edition)

Failed merges:

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

compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs

@@ -229,15 +229,15 @@ pub(crate) fn report_mutability_error(
             } => {
                 err.span_label(span, format!("cannot {ACT}", ACT = act));
 
-                if let Some((span, message)) = annotate_struct_field(
+                if let Some(span) = get_mut_span_in_struct_field(
                     self.infcx.tcx,
                     Place::ty_from(local, proj_base, self.body, self.infcx.tcx).ty,
                     field,
                 ) {
-                    err.span_suggestion(
+                    err.span_suggestion_verbose(
                         span,
                         "consider changing this to be mutable",
-                        message,
+                        " mut ".into(),
                         Applicability::MaybeIncorrect,
                     );
                 }
@@ -1059,18 +1059,18 @@ fn is_closure_or_generator(ty: Ty<'_>) -> bool {
     ty.is_closure() || ty.is_generator()
 }
 
-/// Adds a suggestion to a struct definition given a field access to a local.
-/// This function expects the local to be a reference to a struct in order to produce a suggestion.
+/// Given a field that needs to be mutable, returns a span where the " mut " could go.
+/// This function expects the local to be a reference to a struct in order to produce a span.
 ///
 /// ```text
-/// LL |     s: &'a String
-///    |        ---------- use `&'a mut String` here to make mutable
+/// LL |     s: &'a   String
+///    |           ^^^ returns a span taking up the space here
 /// ```
-fn annotate_struct_field<'tcx>(
+fn get_mut_span_in_struct_field<'tcx>(
     tcx: TyCtxt<'tcx>,
     ty: Ty<'tcx>,
     field: &mir::Field,
-) -> Option<(Span, String)> {
+) -> Option<Span> {
     // Expect our local to be a reference to a struct of some kind.
     if let ty::Ref(_, ty, _) = ty.kind() {
         if let ty::Adt(def, _) = ty.kind() {
@@ -1081,25 +1081,10 @@ fn annotate_struct_field<'tcx>(
             // Now we're dealing with the actual struct that we're going to suggest a change to,
             // we can expect a field that is an immutable reference to a type.
             if let hir::Node::Field(field) = node {
-                if let hir::TyKind::Rptr(
-                    lifetime,
-                    hir::MutTy { mutbl: hir::Mutability::Not, ref ty },
-                ) = field.ty.kind
+                if let hir::TyKind::Rptr(lifetime, hir::MutTy { mutbl: hir::Mutability::Not, ty }) =
+                    field.ty.kind
                 {
-                    // Get the snippets in two parts - the named lifetime (if there is one) and
-                    // type being referenced, that way we can reconstruct the snippet without loss
-                    // of detail.
-                    let type_snippet = tcx.sess.source_map().span_to_snippet(ty.span).ok()?;
-                    let lifetime_snippet = if !lifetime.is_elided() {
-                        format!("{} ", tcx.sess.source_map().span_to_snippet(lifetime.span).ok()?)
-                    } else {
-                        String::new()
-                    };
-
-                    return Some((
-                        field.ty.span,
-                        format!("&{}mut {}", lifetime_snippet, &*type_snippet,),
-                    ));
+                    return Some(lifetime.span.between(ty.span));
                 }
             }
         }

compiler/rustc_mir_dataflow/src/framework/direction.rs

@@ -18,7 +18,7 @@ fn is_backward() -> bool {
     /// Applies all effects between the given `EffectIndex`s.
     ///
     /// `effects.start()` must precede or equal `effects.end()` in this direction.
-    fn apply_effects_in_range<A>(
+    fn apply_effects_in_range<'tcx, A>(
         analysis: &A,
         state: &mut A::Domain,
         block: BasicBlock,
@@ -27,7 +27,7 @@ fn apply_effects_in_range<A>(
     ) where
         A: Analysis<'tcx>;
 
-    fn apply_effects_in_block<A>(
+    fn apply_effects_in_block<'tcx, A>(
         analysis: &A,
         state: &mut A::Domain,
         block: BasicBlock,
@@ -35,7 +35,7 @@ fn apply_effects_in_block<A>(
     ) where
         A: Analysis<'tcx>;
 
-    fn gen_kill_effects_in_block<A>(
+    fn gen_kill_effects_in_block<'tcx, A>(
         analysis: &A,
         trans: &mut GenKillSet<A::Idx>,
         block: BasicBlock,
@@ -43,7 +43,7 @@ fn gen_kill_effects_in_block<A>(
     ) where
         A: GenKillAnalysis<'tcx>;
 
-    fn visit_results_in_block<F, R>(
+    fn visit_results_in_block<'mir, 'tcx, F, R>(
         state: &mut F,
         block: BasicBlock,
         block_data: &'mir mir::BasicBlockData<'tcx>,
@@ -52,7 +52,7 @@ fn visit_results_in_block<F, R>(
     ) where
         R: ResultsVisitable<'tcx, FlowState = F>;
 
-    fn join_state_into_successors_of<A>(
+    fn join_state_into_successors_of<'tcx, A>(
         analysis: &A,
         tcx: TyCtxt<'tcx>,
         body: &mir::Body<'tcx>,
@@ -72,7 +72,7 @@ fn is_forward() -> bool {
         false
     }
 
-    fn apply_effects_in_block<A>(
+    fn apply_effects_in_block<'tcx, A>(
         analysis: &A,
         state: &mut A::Domain,
         block: BasicBlock,
@@ -92,7 +92,7 @@ fn apply_effects_in_block<A>(
         }
     }
 
-    fn gen_kill_effects_in_block<A>(
+    fn gen_kill_effects_in_block<'tcx, A>(
         analysis: &A,
         trans: &mut GenKillSet<A::Idx>,
         block: BasicBlock,
@@ -112,7 +112,7 @@ fn gen_kill_effects_in_block<A>(
         }
     }
 
-    fn apply_effects_in_range<A>(
+    fn apply_effects_in_range<'tcx, A>(
         analysis: &A,
         state: &mut A::Domain,
         block: BasicBlock,
@@ -189,7 +189,7 @@ fn apply_effects_in_range<A>(
         analysis.apply_statement_effect(state, statement, location);
     }
 
-    fn visit_results_in_block<F, R>(
+    fn visit_results_in_block<'mir, 'tcx, F, R>(
         state: &mut F,
         block: BasicBlock,
         block_data: &'mir mir::BasicBlockData<'tcx>,
@@ -221,7 +221,7 @@ fn visit_results_in_block<F, R>(
         vis.visit_block_start(state, block_data, block);
     }
 
-    fn join_state_into_successors_of<A>(
+    fn join_state_into_successors_of<'tcx, A>(
         analysis: &A,
         _tcx: TyCtxt<'tcx>,
         body: &mir::Body<'tcx>,
@@ -294,7 +294,7 @@ fn is_forward() -> bool {
         true
     }
 
-    fn apply_effects_in_block<A>(
+    fn apply_effects_in_block<'tcx, A>(
         analysis: &A,
         state: &mut A::Domain,
         block: BasicBlock,
@@ -314,7 +314,7 @@ fn apply_effects_in_block<A>(
         analysis.apply_terminator_effect(state, terminator, location);
     }
 
-    fn gen_kill_effects_in_block<A>(
+    fn gen_kill_effects_in_block<'tcx, A>(
         analysis: &A,
         trans: &mut GenKillSet<A::Idx>,
         block: BasicBlock,
@@ -334,7 +334,7 @@ fn gen_kill_effects_in_block<A>(
         analysis.terminator_effect(trans, terminator, location);
     }
 
-    fn apply_effects_in_range<A>(
+    fn apply_effects_in_range<'tcx, A>(
         analysis: &A,
         state: &mut A::Domain,
         block: BasicBlock,
@@ -407,7 +407,7 @@ fn apply_effects_in_range<A>(
         }
     }
 
-    fn visit_results_in_block<F, R>(
+    fn visit_results_in_block<'mir, 'tcx, F, R>(
         state: &mut F,
         block: BasicBlock,
         block_data: &'mir mir::BasicBlockData<'tcx>,
@@ -438,7 +438,7 @@ fn visit_results_in_block<F, R>(
         vis.visit_block_end(state, block_data, block);
     }
 
-    fn join_state_into_successors_of<A>(
+    fn join_state_into_successors_of<'tcx, A>(
         analysis: &A,
         _tcx: TyCtxt<'tcx>,
         _body: &mir::Body<'tcx>,
@@ -591,7 +591,7 @@ fn apply(&mut self, mut apply_edge_effect: impl FnMut(&mut D, SwitchIntTarget))
 //
 // FIXME: Figure out how to express this using `Option::clone_from`, or maybe lift it into the
 // standard library?
-fn opt_clone_from_or_clone<T: Clone>(opt: &'a mut Option<T>, val: &T) -> &'a mut T {
+fn opt_clone_from_or_clone<'a, T: Clone>(opt: &'a mut Option<T>, val: &T) -> &'a mut T {
     if opt.is_some() {
         let ret = opt.as_mut().unwrap();
         ret.clone_from(val);

compiler/rustc_mir_dataflow/src/framework/engine.rs

@@ -31,12 +31,15 @@ pub struct Results<'tcx, A>
     pub(super) entry_sets: IndexVec<BasicBlock, A::Domain>,
 }
 
-impl<A> Results<'tcx, A>
+impl<'tcx, A> Results<'tcx, A>
 where
     A: Analysis<'tcx>,
 {
     /// Creates a `ResultsCursor` that can inspect these `Results`.
-    pub fn into_results_cursor(self, body: &'mir mir::Body<'tcx>) -> ResultsCursor<'mir, 'tcx, A> {
+    pub fn into_results_cursor<'mir>(
+        self,
+        body: &'mir mir::Body<'tcx>,
+    ) -> ResultsCursor<'mir, 'tcx, A> {
         ResultsCursor::new(body, self)
     }
 
@@ -45,7 +48,7 @@ pub fn entry_set_for_block(&self, block: BasicBlock) -> &A::Domain {
         &self.entry_sets[block]
     }
 
-    pub fn visit_with(
+    pub fn visit_with<'mir>(
         &self,
         body: &'mir mir::Body<'tcx>,
         blocks: impl IntoIterator<Item = BasicBlock>,
@@ -54,7 +57,7 @@ pub fn visit_with(
         visit_results(body, blocks, self, vis)
     }
 
-    pub fn visit_reachable_with(
+    pub fn visit_reachable_with<'mir>(
         &self,
         body: &'mir mir::Body<'tcx>,
         vis: &mut impl ResultsVisitor<'mir, 'tcx, FlowState = A::Domain>,
@@ -85,7 +88,7 @@ pub struct Engine<'a, 'tcx, A>
     apply_trans_for_block: Option<Box<dyn Fn(BasicBlock, &mut A::Domain)>>,
 }
 
-impl<A, D, T> Engine<'a, 'tcx, A>
+impl<'a, 'tcx, A, D, T> Engine<'a, 'tcx, A>
 where
     A: GenKillAnalysis<'tcx, Idx = T, Domain = D>,
     D: Clone + JoinSemiLattice + GenKill<T> + BorrowMut<BitSet<T>>,
@@ -119,7 +122,7 @@ pub fn new_gen_kill(tcx: TyCtxt<'tcx>, body: &'a mir::Body<'tcx>, analysis: A) -
     }
 }
 
-impl<A, D> Engine<'a, 'tcx, A>
+impl<'a, 'tcx, A, D> Engine<'a, 'tcx, A>
 where
     A: Analysis<'tcx, Domain = D>,
     D: Clone + JoinSemiLattice,
@@ -257,7 +260,7 @@ pub fn iterate_to_fixpoint(self) -> Results<'tcx, A>
 
 /// Writes a DOT file containing the results of a dataflow analysis if the user requested it via
 /// `rustc_mir` attributes.
-fn write_graphviz_results<A>(
+fn write_graphviz_results<'tcx, A>(
     tcx: TyCtxt<'tcx>,
     body: &mir::Body<'tcx>,
     results: &Results<'tcx, A>,
@@ -330,7 +333,7 @@ struct RustcMirAttrs {
 }
 
 impl RustcMirAttrs {
-    fn parse(tcx: TyCtxt<'tcx>, def_id: DefId) -> Result<Self, ()> {
+    fn parse(tcx: TyCtxt<'_>, def_id: DefId) -> Result<Self, ()> {
         let attrs = tcx.get_attrs(def_id);
 
         let mut result = Ok(());
@@ -373,7 +376,7 @@ fn parse(tcx: TyCtxt<'tcx>, def_id: DefId) -> Result<Self, ()> {
 
     fn set_field<T>(
         field: &mut Option<T>,
-        tcx: TyCtxt<'tcx>,
+        tcx: TyCtxt<'_>,
         attr: &ast::NestedMetaItem,
         mapper: impl FnOnce(Symbol) -> Result<T, ()>,
     ) -> Result<(), ()> {

compiler/rustc_mir_dataflow/src/framework/graphviz.rs

@@ -36,7 +36,7 @@ pub struct Formatter<'a, 'tcx, A>
     style: OutputStyle,
 }
 
-impl<A> Formatter<'a, 'tcx, A>
+impl<'a, 'tcx, A> Formatter<'a, 'tcx, A>
 where
     A: Analysis<'tcx>,
 {
@@ -52,7 +52,7 @@ pub struct CfgEdge {
     index: usize,
 }
 
-fn dataflow_successors(body: &Body<'tcx>, bb: BasicBlock) -> Vec<CfgEdge> {
+fn dataflow_successors(body: &Body<'_>, bb: BasicBlock) -> Vec<CfgEdge> {
     body[bb]
         .terminator()
         .successors()
@@ -61,7 +61,7 @@ fn dataflow_successors(body: &Body<'tcx>, bb: BasicBlock) -> Vec<CfgEdge> {
         .collect()
 }
 
-impl<A> dot::Labeller<'_> for Formatter<'a, 'tcx, A>
+impl<'tcx, A> dot::Labeller<'_> for Formatter<'_, 'tcx, A>
 where
     A: Analysis<'tcx>,
     A::Domain: DebugWithContext<A>,
@@ -100,7 +100,7 @@ fn edge_label(&self, e: &Self::Edge) -> dot::LabelText<'_> {
     }
 }
 
-impl<A> dot::GraphWalk<'a> for Formatter<'a, 'tcx, A>
+impl<'a, 'tcx, A> dot::GraphWalk<'a> for Formatter<'a, 'tcx, A>
 where
     A: Analysis<'tcx>,
 {
@@ -138,7 +138,7 @@ struct BlockFormatter<'a, 'tcx, A>
     style: OutputStyle,
 }
 
-impl<A> BlockFormatter<'a, 'tcx, A>
+impl<'a, 'tcx, A> BlockFormatter<'a, 'tcx, A>
 where
     A: Analysis<'tcx>,
     A::Domain: DebugWithContext<A>,
@@ -491,7 +491,7 @@ struct StateDiffCollector<'a, 'tcx, A>
     after: Vec<String>,
 }
 
-impl<A> StateDiffCollector<'a, 'tcx, A>
+impl<'a, 'tcx, A> StateDiffCollector<'a, 'tcx, A>
 where
     A: Analysis<'tcx>,
     A::Domain: DebugWithContext<A>,
@@ -514,7 +514,7 @@ fn run(
     }
 }
 
-impl<A> ResultsVisitor<'a, 'tcx> for StateDiffCollector<'a, 'tcx, A>
+impl<'a, 'tcx, A> ResultsVisitor<'a, 'tcx> for StateDiffCollector<'a, 'tcx, A>
 where
     A: Analysis<'tcx>,
     A::Domain: DebugWithContext<A>,
@@ -524,7 +524,7 @@ impl<A> ResultsVisitor<'a, 'tcx> for StateDiffCollector<'a, 'tcx, A>
     fn visit_block_start(
         &mut self,
         state: &Self::FlowState,
-        _block_data: &'mir mir::BasicBlockData<'tcx>,
+        _block_data: &mir::BasicBlockData<'tcx>,
         _block: BasicBlock,
     ) {
         if A::Direction::is_forward() {
@@ -535,7 +535,7 @@ fn visit_block_start(
     fn visit_block_end(
         &mut self,
         state: &Self::FlowState,
-        _block_data: &'mir mir::BasicBlockData<'tcx>,
+        _block_data: &mir::BasicBlockData<'tcx>,
         _block: BasicBlock,
     ) {
         if A::Direction::is_backward() {
@@ -546,7 +546,7 @@ fn visit_block_end(
     fn visit_statement_before_primary_effect(
         &mut self,
         state: &Self::FlowState,
-        _statement: &'mir mir::Statement<'tcx>,
+        _statement: &mir::Statement<'tcx>,
         _location: Location,
     ) {
         if let Some(before) = self.before.as_mut() {
@@ -558,7 +558,7 @@ fn visit_statement_before_primary_effect(
     fn visit_statement_after_primary_effect(
         &mut self,
         state: &Self::FlowState,
-        _statement: &'mir mir::Statement<'tcx>,
+        _statement: &mir::Statement<'tcx>,
         _location: Location,
     ) {
         self.after.push(diff_pretty(state, &self.prev_state, self.analysis));
@@ -568,7 +568,7 @@ fn visit_statement_after_primary_effect(
     fn visit_terminator_before_primary_effect(
         &mut self,
         state: &Self::FlowState,
-        _terminator: &'mir mir::Terminator<'tcx>,
+        _terminator: &mir::Terminator<'tcx>,
         _location: Location,
     ) {
         if let Some(before) = self.before.as_mut() {
@@ -580,7 +580,7 @@ fn visit_terminator_before_primary_effect(
     fn visit_terminator_after_primary_effect(
         &mut self,
         state: &Self::FlowState,
-        _terminator: &'mir mir::Terminator<'tcx>,
+        _terminator: &mir::Terminator<'tcx>,
         _location: Location,
     ) {
         self.after.push(diff_pretty(state, &self.prev_state, self.analysis));

compiler/rustc_mir_dataflow/src/framework/mod.rs

@@ -214,7 +214,11 @@ fn apply_switch_int_edge_effects(
     ///     .iterate_to_fixpoint()
     ///     .into_results_cursor(body);
     /// ```
-    fn into_engine(self, tcx: TyCtxt<'tcx>, body: &'mir mir::Body<'tcx>) -> Engine<'mir, 'tcx, Self>
+    fn into_engine<'mir>(
+        self,
+        tcx: TyCtxt<'tcx>,
+        body: &'mir mir::Body<'tcx>,
+    ) -> Engine<'mir, 'tcx, Self>
     where
         Self: Sized,
     {
@@ -296,7 +300,7 @@ fn switch_int_edge_effects<G: GenKill<Self::Idx>>(
     }
 }
 
-impl<A> Analysis<'tcx> for A
+impl<'tcx, A> Analysis<'tcx> for A
 where
     A: GenKillAnalysis<'tcx>,
     A::Domain: GenKill<A::Idx> + BorrowMut<BitSet<A::Idx>>,
@@ -368,7 +372,11 @@ fn apply_switch_int_edge_effects(
 
     /* Extension methods */
 
-    fn into_engine(self, tcx: TyCtxt<'tcx>, body: &'mir mir::Body<'tcx>) -> Engine<'mir, 'tcx, Self>
+    fn into_engine<'mir>(
+        self,
+        tcx: TyCtxt<'tcx>,
+        body: &'mir mir::Body<'tcx>,
+    ) -> Engine<'mir, 'tcx, Self>
     where
         Self: Sized,
     {

compiler/rustc_mir_dataflow/src/framework/tests.rs

@@ -85,7 +85,7 @@ struct MockAnalysis<'tcx, D> {
     dir: PhantomData<D>,
 }
 
-impl<D: Direction> MockAnalysis<'tcx, D> {
+impl<D: Direction> MockAnalysis<'_, D> {
     const BASIC_BLOCK_OFFSET: usize = 100;
 
     /// The entry set for each `BasicBlock` is the ID of that block offset by a fixed amount to
@@ -160,7 +160,7 @@ fn expected_state_at_target(&self, target: SeekTarget) -> BitSet<usize> {
     }
 }
 
-impl<D: Direction> AnalysisDomain<'tcx> for MockAnalysis<'tcx, D> {
+impl<'tcx, D: Direction> AnalysisDomain<'tcx> for MockAnalysis<'tcx, D> {
     type Domain = BitSet<usize>;
     type Direction = D;
 
@@ -175,7 +175,7 @@ fn initialize_start_block(&self, _: &mir::Body<'tcx>, _: &mut Self::Domain) {
     }
 }
 
-impl<D: Direction> Analysis<'tcx> for MockAnalysis<'tcx, D> {
+impl<'tcx, D: Direction> Analysis<'tcx> for MockAnalysis<'tcx, D> {
     fn apply_statement_effect(
         &self,
         state: &mut Self::Domain,
@@ -260,7 +260,7 @@ fn iter_in_block(body: &mir::Body<'_>, block: BasicBlock) -> impl Iterator<Item
     }
 }
 
-fn test_cursor<D: Direction>(analysis: MockAnalysis<'tcx, D>) {
+fn test_cursor<D: Direction>(analysis: MockAnalysis<'_, D>) {
     let body = analysis.body;
 
     let mut cursor =

compiler/rustc_mir_dataflow/src/framework/visitor.rs

@@ -4,7 +4,7 @@
 
 /// Calls the corresponding method in `ResultsVisitor` for every location in a `mir::Body` with the
 /// dataflow state at that location.
-pub fn visit_results<F, V>(
+pub fn visit_results<'mir, 'tcx, F, V>(
     body: &'mir mir::Body<'tcx>,
     blocks: impl IntoIterator<Item = BasicBlock>,
     results: &V,

compiler/rustc_mir_dataflow/src/impls/borrowed_locals.rs

@@ -45,7 +45,7 @@ fn transfer_function<'a, T>(&'a self, trans: &'a mut T) -> TransferFunction<'a,
     }
 }
 
-impl AnalysisDomain<'tcx> for MaybeBorrowedLocals {
+impl<'tcx> AnalysisDomain<'tcx> for MaybeBorrowedLocals {
     type Domain = BitSet<Local>;
     const NAME: &'static str = "maybe_borrowed_locals";
 
@@ -59,7 +59,7 @@ fn initialize_start_block(&self, _: &mir::Body<'tcx>, _: &mut Self::Domain) {
     }
 }
 
-impl GenKillAnalysis<'tcx> for MaybeBorrowedLocals {
+impl<'tcx> GenKillAnalysis<'tcx> for MaybeBorrowedLocals {
     type Idx = Local;
 
     fn statement_effect(
@@ -95,7 +95,7 @@ struct TransferFunction<'a, T> {
     ignore_borrow_on_drop: bool,
 }
 
-impl<T> Visitor<'tcx> for TransferFunction<'a, T>
+impl<'tcx, T> Visitor<'tcx> for TransferFunction<'_, T>
 where
     T: GenKill<Local>,
 {

compiler/rustc_mir_dataflow/src/impls/init_locals.rs

@@ -10,7 +10,7 @@
 
 pub struct MaybeInitializedLocals;
 
-impl crate::AnalysisDomain<'tcx> for MaybeInitializedLocals {
+impl<'tcx> crate::AnalysisDomain<'tcx> for MaybeInitializedLocals {
     type Domain = BitSet<Local>;
 
     const NAME: &'static str = "maybe_init_locals";
@@ -28,7 +28,7 @@ fn initialize_start_block(&self, body: &mir::Body<'tcx>, entry_set: &mut Self::D
     }
 }
 
-impl crate::GenKillAnalysis<'tcx> for MaybeInitializedLocals {
+impl<'tcx> crate::GenKillAnalysis<'tcx> for MaybeInitializedLocals {
     type Idx = Local;
 
     fn statement_effect(
@@ -73,7 +73,7 @@ struct TransferFunction<'a, T> {
     trans: &'a mut T,
 }
 
-impl<T> Visitor<'tcx> for TransferFunction<'a, T>
+impl<T> Visitor<'_> for TransferFunction<'_, T>
 where
     T: GenKill<Local>,
 {

compiler/rustc_mir_dataflow/src/impls/liveness.rs

@@ -48,12 +48,12 @@
 pub struct MaybeLiveLocals;
 
 impl MaybeLiveLocals {
-    fn transfer_function<T>(&self, trans: &'a mut T) -> TransferFunction<'a, T> {
+    fn transfer_function<'a, T>(&self, trans: &'a mut T) -> TransferFunction<'a, T> {
         TransferFunction(trans)
     }
 }
 
-impl AnalysisDomain<'tcx> for MaybeLiveLocals {
+impl<'tcx> AnalysisDomain<'tcx> for MaybeLiveLocals {
     type Domain = BitSet<Local>;
     type Direction = Backward;
 
@@ -69,7 +69,7 @@ fn initialize_start_block(&self, _: &mir::Body<'tcx>, _: &mut Self::Domain) {
     }
 }
 
-impl GenKillAnalysis<'tcx> for MaybeLiveLocals {
+impl<'tcx> GenKillAnalysis<'tcx> for MaybeLiveLocals {
     type Idx = Local;
 
     fn statement_effect(

compiler/rustc_mir_dataflow/src/impls/mod.rs

@@ -704,7 +704,7 @@ fn call_return_effect(
 ///
 /// If the basic block matches this pattern, this function returns the place corresponding to the
 /// enum (`_1` in the example above) as well as the `AdtDef` of that enum.
-fn switch_on_enum_discriminant(
+fn switch_on_enum_discriminant<'mir, 'tcx>(
     tcx: TyCtxt<'tcx>,
     body: &'mir mir::Body<'tcx>,
     block: &'mir mir::BasicBlockData<'tcx>,

compiler/rustc_mir_dataflow/src/impls/storage_liveness.rs

@@ -17,7 +17,7 @@ pub fn new(always_live_locals: AlwaysLiveLocals) -> Self {
     }
 }
 
-impl crate::AnalysisDomain<'tcx> for MaybeStorageLive {
+impl<'tcx> crate::AnalysisDomain<'tcx> for MaybeStorageLive {
     type Domain = BitSet<Local>;
 
     const NAME: &'static str = "maybe_storage_live";
@@ -39,7 +39,7 @@ fn initialize_start_block(&self, body: &mir::Body<'tcx>, on_entry: &mut Self::Do
     }
 }
 
-impl crate::GenKillAnalysis<'tcx> for MaybeStorageLive {
+impl<'tcx> crate::GenKillAnalysis<'tcx> for MaybeStorageLive {
     type Idx = Local;
 
     fn statement_effect(

compiler/rustc_mir_dataflow/src/lib.rs

@@ -3,7 +3,6 @@
 #![feature(box_patterns)]
 #![feature(box_syntax)]
 #![feature(exact_size_is_empty)]
-#![feature(in_band_lifetimes)]
 #![feature(let_else)]
 #![feature(min_specialization)]
 #![feature(once_cell)]

compiler/rustc_mir_dataflow/src/storage.rs

@@ -11,7 +11,7 @@
 pub struct AlwaysLiveLocals(BitSet<Local>);
 
 impl AlwaysLiveLocals {
-    pub fn new(body: &mir::Body<'tcx>) -> Self {
+    pub fn new(body: &mir::Body<'_>) -> Self {
         let mut always_live_locals = AlwaysLiveLocals(BitSet::new_filled(body.local_decls.len()));
 
         for block in body.basic_blocks() {

compiler/rustc_passes/src/check_attr.rs

@@ -58,7 +58,7 @@ struct CheckAttrVisitor<'tcx> {
     tcx: TyCtxt<'tcx>,
 }
 
-impl CheckAttrVisitor<'tcx> {
+impl CheckAttrVisitor<'_> {
     /// Checks any attribute.
     fn check_attributes(
         &self,
@@ -382,7 +382,7 @@ fn check_track_caller(
         &self,
         hir_id: HirId,
         attr_span: &Span,
-        attrs: &'hir [Attribute],
+        attrs: &[Attribute],
         span: &Span,
         target: Target,
     ) -> bool {
@@ -1481,7 +1481,7 @@ fn check_no_mangle(&self, hir_id: HirId, attr: &Attribute, span: &Span, target:
     /// Checks if the `#[repr]` attributes on `item` are valid.
     fn check_repr(
         &self,
-        attrs: &'hir [Attribute],
+        attrs: &[Attribute],
         span: &Span,
         target: Target,
         item: Option<ItemLike<'_>>,
@@ -1663,7 +1663,7 @@ fn check_repr(
         }
     }
 
-    fn check_used(&self, attrs: &'hir [Attribute], target: Target) {
+    fn check_used(&self, attrs: &[Attribute], target: Target) {
         for attr in attrs {
             if attr.has_name(sym::used) && target != Target::Static {
                 self.tcx
@@ -1842,7 +1842,7 @@ fn check_plugin_registrar(&self, hir_id: HirId, attr: &Attribute, target: Target
     }
 }
 
-impl Visitor<'tcx> for CheckAttrVisitor<'tcx> {
+impl<'tcx> Visitor<'tcx> for CheckAttrVisitor<'tcx> {
     type Map = Map<'tcx>;
 
     fn nested_visit_map(&mut self) -> NestedVisitorMap<Self::Map> {

compiler/rustc_passes/src/check_const.rs

@@ -78,7 +78,7 @@ fn new(tcx: TyCtxt<'tcx>) -> Self {
 impl<'tcx> hir::itemlikevisit::ItemLikeVisitor<'tcx> for CheckConstTraitVisitor<'tcx> {
     /// check for const trait impls, and errors if the impl uses provided/default functions
     /// of the trait being implemented; as those provided functions can be non-const.
-    fn visit_item(&mut self, item: &'hir hir::Item<'hir>) {
+    fn visit_item<'hir>(&mut self, item: &'hir hir::Item<'hir>) {
         let _: Option<_> = try {
             if let hir::ItemKind::Impl(ref imp) = item.kind {
                 if let hir::Constness::Const = imp.constness {
@@ -134,11 +134,11 @@ fn visit_item(&mut self, item: &'hir hir::Item<'hir>) {
         };
     }
 
-    fn visit_trait_item(&mut self, _: &'hir hir::TraitItem<'hir>) {}
+    fn visit_trait_item<'hir>(&mut self, _: &'hir hir::TraitItem<'hir>) {}
 
-    fn visit_impl_item(&mut self, _: &'hir hir::ImplItem<'hir>) {}
+    fn visit_impl_item<'hir>(&mut self, _: &'hir hir::ImplItem<'hir>) {}
 
-    fn visit_foreign_item(&mut self, _: &'hir hir::ForeignItem<'hir>) {}
+    fn visit_foreign_item<'hir>(&mut self, _: &'hir hir::ForeignItem<'hir>) {}
 }
 
 #[derive(Copy, Clone)]

compiler/rustc_passes/src/dead.rs

@@ -150,7 +150,7 @@ fn handle_assign(&mut self, expr: &'tcx hir::Expr<'tcx>) {
 
     #[allow(dead_code)] // FIXME(81658): should be used + lint reinstated after #83171 relands.
     fn check_for_self_assign(&mut self, assign: &'tcx hir::Expr<'tcx>) {
-        fn check_for_self_assign_helper(
+        fn check_for_self_assign_helper<'tcx>(
             tcx: TyCtxt<'tcx>,
             typeck_results: &'tcx ty::TypeckResults<'tcx>,
             lhs: &'tcx hir::Expr<'tcx>,
@@ -600,7 +600,7 @@ struct DeadVisitor<'tcx> {
     live_symbols: FxHashSet<LocalDefId>,
 }
 
-impl DeadVisitor<'tcx> {
+impl<'tcx> DeadVisitor<'tcx> {
     fn should_warn_about_item(&mut self, item: &hir::Item<'_>) -> bool {
         let should_warn = matches!(
             item.kind,
@@ -672,7 +672,7 @@ fn warn_dead_code(
     }
 }
 
-impl Visitor<'tcx> for DeadVisitor<'tcx> {
+impl<'tcx> Visitor<'tcx> for DeadVisitor<'tcx> {
     type Map = Map<'tcx>;
 
     /// Walk nested items in place so that we don't report dead-code

compiler/rustc_passes/src/intrinsicck.rs

@@ -62,7 +62,7 @@ fn unpack_option_like<'tcx>(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>) -> Ty<'tcx> {
     ty
 }
 
-impl ExprVisitor<'tcx> {
+impl<'tcx> ExprVisitor<'tcx> {
     fn def_id_is_transmute(&self, def_id: DefId) -> bool {
         self.tcx.fn_sig(def_id).abi() == RustIntrinsic
             && self.tcx.item_name(def_id) == sym::transmute
@@ -487,7 +487,7 @@ fn check_asm(&self, asm: &hir::InlineAsm<'tcx>, hir_id: hir::HirId) {
     }
 }
 
-impl Visitor<'tcx> for ItemVisitor<'tcx> {
+impl<'tcx> Visitor<'tcx> for ItemVisitor<'tcx> {
     type Map = intravisit::ErasedMap<'tcx>;
 
     fn nested_visit_map(&mut self) -> NestedVisitorMap<Self::Map> {
@@ -504,7 +504,7 @@ fn visit_nested_body(&mut self, body_id: hir::BodyId) {
     }
 }
 
-impl Visitor<'tcx> for ExprVisitor<'tcx> {
+impl<'tcx> Visitor<'tcx> for ExprVisitor<'tcx> {
     type Map = intravisit::ErasedMap<'tcx>;
 
     fn nested_visit_map(&mut self) -> NestedVisitorMap<Self::Map> {

compiler/rustc_passes/src/lang_items.rs

@@ -28,7 +28,7 @@ struct LanguageItemCollector<'tcx> {
     tcx: TyCtxt<'tcx>,
 }
 
-impl ItemLikeVisitor<'v> for LanguageItemCollector<'tcx> {
+impl<'v, 'tcx> ItemLikeVisitor<'v> for LanguageItemCollector<'tcx> {
     fn visit_item(&mut self, item: &hir::Item<'_>) {
         self.check_for_lang(Target::from_item(item), item.hir_id());
 
@@ -50,7 +50,7 @@ fn visit_impl_item(&mut self, impl_item: &hir::ImplItem<'_>) {
     fn visit_foreign_item(&mut self, _: &hir::ForeignItem<'_>) {}
 }
 
-impl LanguageItemCollector<'tcx> {
+impl<'tcx> LanguageItemCollector<'tcx> {
     fn new(tcx: TyCtxt<'tcx>) -> LanguageItemCollector<'tcx> {
         LanguageItemCollector { tcx, items: LanguageItems::new() }
     }

compiler/rustc_passes/src/layout_test.rs

@@ -20,7 +20,7 @@ struct LayoutTest<'tcx> {
     tcx: TyCtxt<'tcx>,
 }
 
-impl ItemLikeVisitor<'tcx> for LayoutTest<'tcx> {
+impl<'tcx> ItemLikeVisitor<'tcx> for LayoutTest<'tcx> {
     fn visit_item(&mut self, item: &'tcx hir::Item<'tcx>) {
         match item.kind {
             ItemKind::TyAlias(..)
@@ -42,7 +42,7 @@ fn visit_impl_item(&mut self, _: &'tcx hir::ImplItem<'tcx>) {}
     fn visit_foreign_item(&mut self, _: &'tcx hir::ForeignItem<'tcx>) {}
 }
 
-impl LayoutTest<'tcx> {
+impl<'tcx> LayoutTest<'tcx> {
     fn dump_layout_of(&self, item_def_id: LocalDefId, item: &hir::Item<'tcx>, attr: &Attribute) {
         let tcx = self.tcx;
         let param_env = self.tcx.param_env(item_def_id);
@@ -114,7 +114,7 @@ struct UnwrapLayoutCx<'tcx> {
     param_env: ParamEnv<'tcx>,
 }
 
-impl LayoutOfHelpers<'tcx> for UnwrapLayoutCx<'tcx> {
+impl<'tcx> LayoutOfHelpers<'tcx> for UnwrapLayoutCx<'tcx> {
     type LayoutOfResult = TyAndLayout<'tcx>;
 
     fn handle_layout_err(&self, err: LayoutError<'tcx>, span: Span, ty: Ty<'tcx>) -> ! {
@@ -127,19 +127,19 @@ fn handle_layout_err(&self, err: LayoutError<'tcx>, span: Span, ty: Ty<'tcx>) ->
     }
 }
 
-impl HasTyCtxt<'tcx> for UnwrapLayoutCx<'tcx> {
+impl<'tcx> HasTyCtxt<'tcx> for UnwrapLayoutCx<'tcx> {
     fn tcx(&self) -> TyCtxt<'tcx> {
         self.tcx
     }
 }
 
-impl HasParamEnv<'tcx> for UnwrapLayoutCx<'tcx> {
+impl<'tcx> HasParamEnv<'tcx> for UnwrapLayoutCx<'tcx> {
     fn param_env(&self) -> ParamEnv<'tcx> {
         self.param_env
     }
 }
 
-impl HasDataLayout for UnwrapLayoutCx<'tcx> {
+impl<'tcx> HasDataLayout for UnwrapLayoutCx<'tcx> {
     fn data_layout(&self) -> &TargetDataLayout {
         self.tcx.data_layout()
     }

compiler/rustc_passes/src/lib.rs

@@ -6,7 +6,6 @@
 
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![feature(crate_visibility_modifier)]
-#![feature(in_band_lifetimes)]
 #![feature(map_try_insert)]
 #![feature(min_specialization)]
 #![feature(nll)]

compiler/rustc_passes/src/lib_features.rs

@@ -23,7 +23,7 @@ pub struct LibFeatureCollector<'tcx> {
     lib_features: LibFeatures,
 }
 
-impl LibFeatureCollector<'tcx> {
+impl<'tcx> LibFeatureCollector<'tcx> {
     fn new(tcx: TyCtxt<'tcx>) -> LibFeatureCollector<'tcx> {
         LibFeatureCollector { tcx, lib_features: new_lib_features() }
     }
@@ -110,7 +110,7 @@ fn span_feature_error(&self, span: Span, msg: &str) {
     }
 }
 
-impl Visitor<'tcx> for LibFeatureCollector<'tcx> {
+impl<'tcx> Visitor<'tcx> for LibFeatureCollector<'tcx> {
     type Map = Map<'tcx>;
 
     fn nested_visit_map(&mut self) -> NestedVisitorMap<Self::Map> {

compiler/rustc_passes/src/liveness.rs

@@ -198,7 +198,7 @@ struct IrMaps<'tcx> {
     lnks: IndexVec<LiveNode, LiveNodeKind>,
 }
 
-impl IrMaps<'tcx> {
+impl<'tcx> IrMaps<'tcx> {
     fn new(tcx: TyCtxt<'tcx>) -> IrMaps<'tcx> {
         IrMaps {
             tcx,

compiler/rustc_passes/src/naked_functions.rs

@@ -37,7 +37,7 @@ fn nested_visit_map(&mut self) -> NestedVisitorMap<Self::Map> {
 
     fn visit_fn(
         &mut self,
-        fk: FnKind<'v>,
+        fk: FnKind<'_>,
         _fd: &'tcx hir::FnDecl<'tcx>,
         body_id: hir::BodyId,
         span: Span,

compiler/rustc_passes/src/reachable.rs

@@ -22,7 +22,7 @@
 // Returns true if the given item must be inlined because it may be
 // monomorphized or it was marked with `#[inline]`. This will only return
 // true for functions.
-fn item_might_be_inlined(tcx: TyCtxt<'tcx>, item: &hir::Item<'_>, attrs: &CodegenFnAttrs) -> bool {
+fn item_might_be_inlined(tcx: TyCtxt<'_>, item: &hir::Item<'_>, attrs: &CodegenFnAttrs) -> bool {
     if attrs.requests_inline() {
         return true;
     }

compiler/rustc_passes/src/stability.rs

@@ -655,7 +655,7 @@ fn visit_foreign_item(&mut self, i: &'tcx hir::ForeignItem<'tcx>) {
     // stable (assuming they have not inherited instability from their parent).
 }
 
-fn stability_index(tcx: TyCtxt<'tcx>, (): ()) -> Index<'tcx> {
+fn stability_index<'tcx>(tcx: TyCtxt<'tcx>, (): ()) -> Index<'tcx> {
     let is_staged_api =
         tcx.sess.opts.debugging_opts.force_unstable_if_unmarked || tcx.features().staged_api;
     let mut staged_api = FxHashMap::default();
@@ -737,7 +737,7 @@ struct Checker<'tcx> {
     tcx: TyCtxt<'tcx>,
 }
 
-impl Visitor<'tcx> for Checker<'tcx> {
+impl<'tcx> Visitor<'tcx> for Checker<'tcx> {
     type Map = Map<'tcx>;
 
     /// Because stability levels are scoped lexically, we want to walk
@@ -866,7 +866,7 @@ struct CheckTraitImplStable<'tcx> {
     fully_stable: bool,
 }
 
-impl Visitor<'tcx> for CheckTraitImplStable<'tcx> {
+impl<'tcx> Visitor<'tcx> for CheckTraitImplStable<'tcx> {
     type Map = Map<'tcx>;
 
     fn nested_visit_map(&mut self) -> NestedVisitorMap<Self::Map> {

compiler/rustc_passes/src/upvars.rs

@@ -42,7 +42,7 @@ struct LocalCollector {
     locals: FxHashSet<HirId>,
 }
 
-impl Visitor<'tcx> for LocalCollector {
+impl<'tcx> Visitor<'tcx> for LocalCollector {
     type Map = intravisit::ErasedMap<'tcx>;
 
     fn nested_visit_map(&mut self) -> NestedVisitorMap<Self::Map> {
@@ -71,7 +71,7 @@ fn visit_local_use(&mut self, var_id: HirId, span: Span) {
     }
 }
 
-impl Visitor<'tcx> for CaptureCollector<'a, 'tcx> {
+impl<'tcx> Visitor<'tcx> for CaptureCollector<'_, 'tcx> {
     type Map = intravisit::ErasedMap<'tcx>;
 
     fn nested_visit_map(&mut self) -> NestedVisitorMap<Self::Map> {

library/core/src/cmp.rs

@@ -215,6 +215,7 @@ pub trait PartialEq<Rhs: ?Sized = Self> {
     #[inline]
     #[must_use]
     #[stable(feature = "rust1", since = "1.0.0")]
+    #[default_method_body_is_const]
     fn ne(&self, other: &Rhs) -> bool {
         !self.eq(other)
     }
@@ -1031,6 +1032,7 @@ pub trait PartialOrd<Rhs: ?Sized = Self>: PartialEq<Rhs> {
     #[inline]
     #[must_use]
     #[stable(feature = "rust1", since = "1.0.0")]
+    #[default_method_body_is_const]
     fn lt(&self, other: &Rhs) -> bool {
         matches!(self.partial_cmp(other), Some(Less))
     }
@@ -1050,6 +1052,7 @@ fn lt(&self, other: &Rhs) -> bool {
     #[inline]
     #[must_use]
     #[stable(feature = "rust1", since = "1.0.0")]
+    #[default_method_body_is_const]
     fn le(&self, other: &Rhs) -> bool {
         // Pattern `Some(Less | Eq)` optimizes worse than negating `None | Some(Greater)`.
         // FIXME: The root cause was fixed upstream in LLVM with:
@@ -1072,6 +1075,7 @@ fn le(&self, other: &Rhs) -> bool {
     #[inline]
     #[must_use]
     #[stable(feature = "rust1", since = "1.0.0")]
+    #[default_method_body_is_const]
     fn gt(&self, other: &Rhs) -> bool {
         matches!(self.partial_cmp(other), Some(Greater))
     }
@@ -1091,6 +1095,7 @@ fn gt(&self, other: &Rhs) -> bool {
     #[inline]
     #[must_use]
     #[stable(feature = "rust1", since = "1.0.0")]
+    #[default_method_body_is_const]
     fn ge(&self, other: &Rhs) -> bool {
         matches!(self.partial_cmp(other), Some(Greater | Equal))
     }

library/core/tests/cmp.rs

@@ -203,3 +203,36 @@ fn partial_cmp(&self, other: &RevInt) -> Option<Ordering> {
     assert!(Fool(false) != Fool(false));
     assert_eq!(Fool(false), Fool(true));
 }
+
+#[cfg(not(bootstrap))]
+mod const_cmp {
+    use super::*;
+
+    struct S(i32);
+
+    impl const PartialEq for S {
+        fn eq(&self, other: &Self) -> bool {
+            self.0 == other.0
+        }
+    }
+
+    impl const PartialOrd for S {
+        fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+            let ret = match (self.0, other.0) {
+                (a, b) if a > b => Ordering::Greater,
+                (a, b) if a < b => Ordering::Less,
+                _ => Ordering::Equal,
+            };
+
+            Some(ret)
+        }
+    }
+
+    const _: () = assert!(S(1) == S(1));
+    const _: () = assert!(S(0) != S(1));
+
+    const _: () = assert!(S(1) <= S(1));
+    const _: () = assert!(S(1) >= S(1));
+    const _: () = assert!(S(0) < S(1));
+    const _: () = assert!(S(1) > S(0));
+}

library/std/Cargo.toml

@@ -4,7 +4,7 @@ version = "0.0.0"
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/rust-lang/rust.git"
 description = "The Rust Standard Library"
-edition = "2018"
+edition = "2021"
 
 [lib]
 crate-type = ["dylib", "rlib"]

library/std/src/fs/tests.rs

@@ -38,10 +38,9 @@
     ($e:expr, $s:expr) => {
         match $e {
             Ok(_) => panic!("Unexpected success. Should've been: {:?}", $s),
-            Err(ref err) => assert!(
-                err.raw_os_error() == Some($s),
-                format!("`{}` did not have a code of `{}`", err, $s)
-            ),
+            Err(ref err) => {
+                assert!(err.raw_os_error() == Some($s), "`{}` did not have a code of `{}`", err, $s)
+            }
         }
     };
 }
@@ -58,7 +57,7 @@
         match $e {
             Ok(_) => panic!("Unexpected success. Should've been: {:?}", $s),
             Err(ref err) => {
-                assert!(err.to_string().contains($s), format!("`{}` did not contain `{}`", err, $s))
+                assert!(err.to_string().contains($s), "`{}` did not contain `{}`", err, $s)
             }
         }
     };

library/std/src/os/unix/net/ancillary.rs

@@ -16,8 +16,6 @@ mod libc {
     pub use libc::c_int;
     pub struct ucred;
     pub struct cmsghdr;
-    #[cfg(target_os = "dragonfly")]
-    pub struct cmsgcred;
     pub type pid_t = i32;
     pub type gid_t = u32;
     pub type uid_t = u32;
@@ -185,11 +183,6 @@ fn next(&mut self) -> Option<T> {
 #[derive(Clone)]
 pub struct SocketCred(libc::ucred);
 
-#[cfg(target_os = "dragonfly")]
-#[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
-#[derive(Clone)]
-pub struct SocketCred(libc::cmsgcred);
-
 #[cfg(any(doc, target_os = "android", target_os = "linux",))]
 impl SocketCred {
     /// Create a Unix credential struct.
@@ -241,57 +234,6 @@ pub fn get_gid(&self) -> libc::gid_t {
     }
 }
 
-#[cfg(target_os = "dragonfly")]
-impl SocketCred {
-    /// Create a Unix credential struct.
-    ///
-    /// PID, UID and GID is set to 0.
-    #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
-    #[must_use]
-    pub fn new() -> SocketCred {
-        SocketCred(libc::cmsgcred { cmsgcred_pid: 0, cmsgcred_uid: 0, cmsgcred_gid: 0 })
-    }
-
-    /// Set the PID.
-    #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
-    pub fn set_pid(&mut self, pid: libc::pid_t) {
-        self.0.cmsgcred_pid = pid;
-    }
-
-    /// Get the current PID.
-    #[must_use]
-    #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
-    pub fn get_pid(&self) -> libc::pid_t {
-        self.0.cmsgcred_pid
-    }
-
-    /// Set the UID.
-    #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
-    pub fn set_uid(&mut self, uid: libc::uid_t) {
-        self.0.cmsgcred_uid = uid;
-    }
-
-    /// Get the current UID.
-    #[must_use]
-    #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
-    pub fn get_uid(&self) -> libc::uid_t {
-        self.0.cmsgcred_uid
-    }
-
-    /// Set the GID.
-    #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
-    pub fn set_gid(&mut self, gid: libc::gid_t) {
-        self.0.cmsgcred_gid = gid;
-    }
-
-    /// Get the current GID.
-    #[must_use]
-    #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
-    pub fn get_gid(&self) -> libc::gid_t {
-        self.0.cmsgcred_gid
-    }
-}
-
 /// This control message contains file descriptors.
 ///
 /// The level is equal to `SOL_SOCKET` and the type is equal to `SCM_RIGHTS`.
@@ -314,11 +256,7 @@ fn next(&mut self) -> Option<RawFd> {
 #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
 pub struct ScmCredentials<'a>(AncillaryDataIter<'a, libc::ucred>);
 
-#[cfg(target_os = "dragonfly")]
-#[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
-pub struct ScmCredentials<'a>(AncillaryDataIter<'a, libc::cmsgcred>);
-
-#[cfg(any(doc, target_os = "android", target_os = "linux", target_os = "dragonfly",))]
+#[cfg(any(doc, target_os = "android", target_os = "linux",))]
 #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
 impl<'a> Iterator for ScmCredentials<'a> {
     type Item = SocketCred;
@@ -362,7 +300,7 @@ unsafe fn as_rights(data: &'a [u8]) -> Self {
     /// # Safety
     ///
     /// `data` must contain a valid control message and the control message must be type of
-    /// `SOL_SOCKET` and level of `SCM_CREDENTIALS` or `SCM_CREDS`.
+    /// `SOL_SOCKET` and level of `SCM_CREDENTIALS` or `SCM_CREDENTIALS`.
     #[cfg(any(doc, target_os = "android", target_os = "linux",))]
     unsafe fn as_credentials(data: &'a [u8]) -> Self {
         let ancillary_data_iter = AncillaryDataIter::new(data);
@@ -382,9 +320,6 @@ fn try_from_cmsghdr(cmsg: &'a libc::cmsghdr) -> Result<Self, AncillaryError> {
                     libc::SCM_RIGHTS => Ok(AncillaryData::as_rights(data)),
                     #[cfg(any(target_os = "android", target_os = "linux",))]
                     libc::SCM_CREDENTIALS => Ok(AncillaryData::as_credentials(data)),
-                    #[cfg(target_os = "dragonfly")]
-                    libc::SCM_CREDS => Ok(AncillaryData::as_credentials(data)),
-
                     cmsg_type => {
                         Err(AncillaryError::Unknown { cmsg_level: libc::SOL_SOCKET, cmsg_type })
                     }
@@ -609,19 +544,6 @@ pub fn add_creds(&mut self, creds: &[SocketCred]) -> bool {
         )
     }
 
-    #[cfg(target_os = "dragonfly")]
-    #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
-    pub fn add_creds(&mut self, creds: &[SocketCred]) -> bool {
-        self.truncated = false;
-        add_to_ancillary_data(
-            &mut self.buffer,
-            &mut self.length,
-            creds,
-            libc::SOL_SOCKET,
-            libc::SCM_CREDS,
-        )
-    }
-
     /// Clears the ancillary data, removing all values.
     ///
     /// # Example

library/std/src/os/unix/net/datagram.rs

@@ -854,14 +854,8 @@ pub fn set_nonblocking(&self, nonblocking: bool) -> io::Result<()> {
     ///
     /// # Examples
     ///
-    #[cfg_attr(
-        any(target_os = "android", target_os = "linux", target_os = "dragonfly"),
-        doc = "```no_run"
-    )]
-    #[cfg_attr(
-        not(any(target_os = "android", target_os = "linux", target_os = "dragonfly")),
-        doc = "```ignore"
-    )]
+    #[cfg_attr(any(target_os = "android", target_os = "linux"), doc = "```no_run")]
+    #[cfg_attr(not(any(target_os = "android", target_os = "linux")), doc = "```ignore")]
     /// #![feature(unix_socket_ancillary_data)]
     /// use std::os::unix::net::UnixDatagram;
     ///
@@ -871,7 +865,7 @@ pub fn set_nonblocking(&self, nonblocking: bool) -> io::Result<()> {
     ///     Ok(())
     /// }
     /// ```
-    #[cfg(any(doc, target_os = "android", target_os = "linux", target_os = "dragonfly",))]
+    #[cfg(any(doc, target_os = "android", target_os = "linux",))]
     #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
     pub fn set_passcred(&self, passcred: bool) -> io::Result<()> {
         self.0.set_passcred(passcred)
@@ -883,7 +877,7 @@ pub fn set_passcred(&self, passcred: bool) -> io::Result<()> {
     /// Get the socket option `SO_PASSCRED`.
     ///
     /// [`set_passcred`]: UnixDatagram::set_passcred
-    #[cfg(any(doc, target_os = "android", target_os = "linux", target_os = "dragonfly",))]
+    #[cfg(any(doc, target_os = "android", target_os = "linux",))]
     #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
     pub fn passcred(&self) -> io::Result<bool> {
         self.0.passcred()

library/std/src/process.rs

@@ -1600,7 +1600,6 @@ pub fn code(&self) -> Option<i32> {
     /// ```
     /// #![feature(exit_status_error)]
     /// # if cfg!(unix) {
-    /// use std::convert::TryFrom;
     /// use std::num::NonZeroI32;
     /// use std::process::Command;
     ///

library/std/src/sys/unix/net.rs

@@ -408,12 +408,12 @@ pub fn nodelay(&self) -> io::Result<bool> {
         Ok(raw != 0)
     }
 
-    #[cfg(any(target_os = "android", target_os = "linux", target_os = "dragonfly",))]
+    #[cfg(any(target_os = "android", target_os = "linux",))]
     pub fn set_passcred(&self, passcred: bool) -> io::Result<()> {
         setsockopt(self, libc::SOL_SOCKET, libc::SO_PASSCRED, passcred as libc::c_int)
     }
 
-    #[cfg(any(target_os = "android", target_os = "linux", target_os = "dragonfly",))]
+    #[cfg(any(target_os = "android", target_os = "linux",))]
     pub fn passcred(&self) -> io::Result<bool> {
         let passcred: libc::c_int = getsockopt(self, libc::SOL_SOCKET, libc::SO_PASSCRED)?;
         Ok(passcred != 0)

library/std/src/thread/tests.rs

 use super::Builder;
 use crate::any::Any;
 use crate::mem;
+use crate::panic::panic_any;
 use crate::result;
 use crate::sync::{
     mpsc::{channel, Sender},
@@ -183,7 +184,7 @@ fn test_simple_newsched_spawn() {
 }
 
 #[test]
-fn test_try_panic_message_static_str() {
+fn test_try_panic_message_string_literal() {
     match thread::spawn(move || {
         panic!("static string");
     })
@@ -199,9 +200,9 @@ fn test_try_panic_message_static_str() {
 }
 
 #[test]
-fn test_try_panic_message_owned_str() {
+fn test_try_panic_any_message_owned_str() {
     match thread::spawn(move || {
-        panic!("owned string".to_string());
+        panic_any("owned string".to_string());
     })
     .join()
     {
@@ -215,9 +216,9 @@ fn test_try_panic_message_owned_str() {
 }
 
 #[test]
-fn test_try_panic_message_any() {
+fn test_try_panic_any_message_any() {
     match thread::spawn(move || {
-        panic!(box 413u16 as Box<dyn Any + Send>);
+        panic_any(box 413u16 as Box<dyn Any + Send>);
     })
     .join()
     {
@@ -233,10 +234,10 @@ fn test_try_panic_message_any() {
 }
 
 #[test]
-fn test_try_panic_message_unit_struct() {
+fn test_try_panic_any_message_unit_struct() {
     struct Juju;
 
-    match thread::spawn(move || panic!(Juju)).join() {
+    match thread::spawn(move || panic_any(Juju)).join() {
         Err(ref e) if e.is::<Juju>() => {}
         Err(_) | Ok(()) => panic!(),
     }

src/test/ui/did_you_mean/issue-38147-2.rs

 struct Bar<'a> {
-    s: &'a String
+    s: &'a String,
+    // use wonky spaces to ensure we are creating the span correctly
+    longer_name:   &   'a     Vec<u8>
 }
 
 impl<'a> Bar<'a> {
     fn f(&mut self) {
         self.s.push('x');
         //~^ ERROR cannot borrow `*self.s` as mutable, as it is behind a `&` reference
+
+        self.longer_name.push(13);
+        //~^ ERROR cannot borrow `*self.longer_name` as mutable, as it is behind a `&` reference
     }
 }
 

src/test/ui/did_you_mean/issue-38147-2.stderr

 error[E0596]: cannot borrow `*self.s` as mutable, as it is behind a `&` reference
-  --> $DIR/issue-38147-2.rs:7:9
+  --> $DIR/issue-38147-2.rs:9:9
    |
-LL |     s: &'a String
-   |        ---------- help: consider changing this to be mutable: `&'a mut String`
-...
 LL |         self.s.push('x');
    |         ^^^^^^^^^^^^^^^^ cannot borrow as mutable
+   |
+help: consider changing this to be mutable
+   |
+LL |     s: &'a mut String,
+   |            +++
+
+error[E0596]: cannot borrow `*self.longer_name` as mutable, as it is behind a `&` reference
+  --> $DIR/issue-38147-2.rs:12:9
+   |
+LL |         self.longer_name.push(13);
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^ cannot borrow as mutable
+   |
+help: consider changing this to be mutable
+   |
+LL |     longer_name:   &   'a mut Vec<u8>
+   |                           +++
 
-error: aborting due to previous error
+error: aborting due to 2 previous errors
 
 For more information about this error, try `rustc --explain E0596`.

src/test/ui/did_you_mean/issue-38147-3.stderr

 error[E0596]: cannot borrow `*self.s` as mutable, as it is behind a `&` reference
   --> $DIR/issue-38147-3.rs:7:9
    |
-LL |     s: &'a String
-   |        ---------- help: consider changing this to be mutable: `&'a mut String`
-...
 LL |         self.s.push('x');
    |         ^^^^^^^^^^^^^^^^ cannot borrow as mutable
+   |
+help: consider changing this to be mutable
+   |
+LL |     s: &'a mut String
+   |            +++
 
 error: aborting due to previous error
 

rust-analyzer @ db2a7087

-Subproject commit 7d6fcbc0be2151bfa85ec146545b42d8be2fb28c
+Subproject commit db2a7087b994e20f264f26ad6db75184282ad120

src/tools/tidy/src/edition.rs

@@ -23,8 +23,10 @@ pub fn check(path: &Path, bad: &mut bool) {
                 return;
             }
 
-            // Library crates are not yet ready to migrate to 2021.
-            if path.components().any(|c| c.as_os_str() == "library") {
+            // Not all library crates are ready to migrate to 2021.
+            if file.components().any(|c| c.as_os_str() == "library")
+                && file.components().all(|c| c.as_os_str() != "std")
+            {
                 let has = contents.lines().any(is_edition_2018);
                 if !has {
                     tidy_error!(