Unrolled build for rust-lang#127729

Rollup merge of rust-lang#127729 - compiler-errors:ed-2024-gen, r=oli-obk

Stop using the `gen` identifier in the compiler

In preparation for edition 2024, this PR previews the fallout of removing usages of `gen` since it's being reserved as a keyword.

There are two notable changes here:
1. Had to rename `fn gen(..)` in gen/kill analysis to `gen_`. Not certain there's a better name than that.
2. There are (false?[^1]) positives in `rustc_macros` when using synstructure, which uses `gen impl` to mark an implementation. We could suppress this in a one-off way, or perhaps just ignore `gen` in macros altogether, since if an identifier ends up in expanded code then it'll get properly denied anyways.

Not relevant to the compiler, but it's gonna be really annoying to change `rand`'s `gen` fn in the library and miri...

[^1]: I haven't looked at the synstructure proc macro code itself so I'm not certain if it'll start to fail when converted to ed2024 (or, e.g., when syn starts parsing `gen` as a kw).

compiler/rustc_borrowck/src/dataflow.rs

@@ -553,7 +553,7 @@ impl<'tcx> rustc_mir_dataflow::GenKillAnalysis<'tcx> for Borrows<'_, '_, 'tcx> {
                         panic!("could not find BorrowIndex for location {location:?}");
                     });
 
-                    trans.gen(index);
+                    trans.gen_(index);
                 }
 
                 // Make sure there are no remaining borrows for variables

compiler/rustc_hir/src/hir.rs

@@ -3218,10 +3218,10 @@ impl<'hir> Item<'hir> {
             ItemKind::Static(ty, mutbl, body), (ty, *mutbl, *body);
 
         expect_const, (&'hir Ty<'hir>, &'hir Generics<'hir>, BodyId),
-            ItemKind::Const(ty, gen, body), (ty, gen, *body);
+            ItemKind::Const(ty, generics, body), (ty, generics, *body);
 
         expect_fn, (&FnSig<'hir>, &'hir Generics<'hir>, BodyId),
-            ItemKind::Fn(sig, gen, body), (sig, gen, *body);
+            ItemKind::Fn(sig, generics, body), (sig, generics, *body);
 
         expect_macro, (&ast::MacroDef, MacroKind), ItemKind::Macro(def, mk), (def, *mk);
 
@@ -3233,25 +3233,25 @@ impl<'hir> Item<'hir> {
         expect_global_asm, &'hir InlineAsm<'hir>, ItemKind::GlobalAsm(asm), asm;
 
         expect_ty_alias, (&'hir Ty<'hir>, &'hir Generics<'hir>),
-            ItemKind::TyAlias(ty, gen), (ty, gen);
+            ItemKind::TyAlias(ty, generics), (ty, generics);
 
         expect_opaque_ty, &OpaqueTy<'hir>, ItemKind::OpaqueTy(ty), ty;
 
-        expect_enum, (&EnumDef<'hir>, &'hir Generics<'hir>), ItemKind::Enum(def, gen), (def, gen);
+        expect_enum, (&EnumDef<'hir>, &'hir Generics<'hir>), ItemKind::Enum(def, generics), (def, generics);
 
         expect_struct, (&VariantData<'hir>, &'hir Generics<'hir>),
-            ItemKind::Struct(data, gen), (data, gen);
+            ItemKind::Struct(data, generics), (data, generics);
 
         expect_union, (&VariantData<'hir>, &'hir Generics<'hir>),
-            ItemKind::Union(data, gen), (data, gen);
+            ItemKind::Union(data, generics), (data, generics);
 
         expect_trait,
             (IsAuto, Safety, &'hir Generics<'hir>, GenericBounds<'hir>, &'hir [TraitItemRef]),
-            ItemKind::Trait(is_auto, safety, gen, bounds, items),
-            (*is_auto, *safety, gen, bounds, items);
+            ItemKind::Trait(is_auto, safety, generics, bounds, items),
+            (*is_auto, *safety, generics, bounds, items);
 
         expect_trait_alias, (&'hir Generics<'hir>, GenericBounds<'hir>),
-            ItemKind::TraitAlias(gen, bounds), (gen, bounds);
+            ItemKind::TraitAlias(generics, bounds), (generics, bounds);
 
         expect_impl, &'hir Impl<'hir>, ItemKind::Impl(imp), imp;
     }

compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs

@@ -2554,7 +2554,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                         .and_then(|node| node.generics())
                         .into_iter()
                         .flat_map(|generics| generics.params)
-                        .find(|gen| &gen.def_id.to_def_id() == res_def_id)
+                        .find(|param| &param.def_id.to_def_id() == res_def_id)
                 } else {
                     None
                 }

compiler/rustc_macros/src/diagnostics/diagnostic.rs

@@ -71,6 +71,8 @@ impl<'a> DiagnosticDerive<'a> {
         });
 
         // A lifetime of `'a` causes conflicts, but `_sess` is fine.
+        // FIXME(edition_2024): Fix the `keyword_idents_2024` lint to not trigger here?
+        #[allow(keyword_idents_2024)]
         let mut imp = structure.gen_impl(quote! {
             gen impl<'_sess, G> rustc_errors::Diagnostic<'_sess, G> for @Self
                 where G: rustc_errors::EmissionGuarantee
@@ -148,6 +150,8 @@ impl<'a> LintDiagnosticDerive<'a> {
             }
         });
 
+        // FIXME(edition_2024): Fix the `keyword_idents_2024` lint to not trigger here?
+        #[allow(keyword_idents_2024)]
         let mut imp = structure.gen_impl(quote! {
             gen impl<'__a> rustc_errors::LintDiagnostic<'__a, ()> for @Self {
                 #[track_caller]

compiler/rustc_macros/src/diagnostics/subdiagnostic.rs

@@ -86,6 +86,9 @@ impl SubdiagnosticDerive {
 
         let diag = &self.diag;
         let f = &self.f;
+
+        // FIXME(edition_2024): Fix the `keyword_idents_2024` lint to not trigger here?
+        #[allow(keyword_idents_2024)]
         let ret = structure.gen_impl(quote! {
             gen impl rustc_errors::Subdiagnostic for @Self {
                 fn add_to_diag_with<__G, __F>(
@@ -100,6 +103,7 @@ impl SubdiagnosticDerive {
                 }
             }
         });
+
         ret
     }
 }

compiler/rustc_middle/src/mir/visit.rs

@@ -1016,14 +1016,14 @@ macro_rules! extra_body_methods {
 macro_rules! super_body {
     ($self:ident, $body:ident, $($mutability:ident, $invalidate:tt)?) => {
         let span = $body.span;
-        if let Some(gen) = &$($mutability)? $body.coroutine {
-            if let Some(yield_ty) = $(& $mutability)? gen.yield_ty {
+        if let Some(coroutine) = &$($mutability)? $body.coroutine {
+            if let Some(yield_ty) = $(& $mutability)? coroutine.yield_ty {
                 $self.visit_ty(
                     yield_ty,
                     TyContext::YieldTy(SourceInfo::outermost(span))
                 );
             }
-            if let Some(resume_ty) = $(& $mutability)? gen.resume_ty {
+            if let Some(resume_ty) = $(& $mutability)? coroutine.resume_ty {
                 $self.visit_ty(
                     resume_ty,
                     TyContext::ResumeTy(SourceInfo::outermost(span))

compiler/rustc_mir_dataflow/src/framework/mod.rs

@@ -402,15 +402,15 @@ where
 /// building up a `GenKillSet` and then throwing it away.
 pub trait GenKill<T> {
     /// Inserts `elem` into the state vector.
-    fn gen(&mut self, elem: T);
+    fn gen_(&mut self, elem: T);
 
     /// Removes `elem` from the state vector.
     fn kill(&mut self, elem: T);
 
     /// Calls `gen` for each element in `elems`.
     fn gen_all(&mut self, elems: impl IntoIterator<Item = T>) {
         for elem in elems {
-            self.gen(elem);
+            self.gen_(elem);
         }
     }
 
@@ -424,44 +424,44 @@ pub trait GenKill<T> {
 
 /// Stores a transfer function for a gen/kill problem.
 ///
-/// Calling `gen`/`kill` on a `GenKillSet` will "build up" a transfer function so that it can be
-/// applied multiple times efficiently. When there are multiple calls to `gen` and/or `kill` for
+/// Calling `gen_`/`kill` on a `GenKillSet` will "build up" a transfer function so that it can be
+/// applied multiple times efficiently. When there are multiple calls to `gen_` and/or `kill` for
 /// the same element, the most recent one takes precedence.
 #[derive(Clone)]
 pub struct GenKillSet<T> {
-    gen: HybridBitSet<T>,
+    gen_: HybridBitSet<T>,
     kill: HybridBitSet<T>,
 }
 
 impl<T: Idx> GenKillSet<T> {
     /// Creates a new transfer function that will leave the dataflow state unchanged.
     pub fn identity(universe: usize) -> Self {
         GenKillSet {
-            gen: HybridBitSet::new_empty(universe),
+            gen_: HybridBitSet::new_empty(universe),
             kill: HybridBitSet::new_empty(universe),
         }
     }
 
     pub fn apply(&self, state: &mut impl BitSetExt<T>) {
-        state.union(&self.gen);
+        state.union(&self.gen_);
         state.subtract(&self.kill);
     }
 }
 
 impl<T: Idx> GenKill<T> for GenKillSet<T> {
-    fn gen(&mut self, elem: T) {
-        self.gen.insert(elem);
+    fn gen_(&mut self, elem: T) {
+        self.gen_.insert(elem);
         self.kill.remove(elem);
     }
 
     fn kill(&mut self, elem: T) {
         self.kill.insert(elem);
-        self.gen.remove(elem);
+        self.gen_.remove(elem);
     }
 }
 
 impl<T: Idx> GenKill<T> for BitSet<T> {
-    fn gen(&mut self, elem: T) {
+    fn gen_(&mut self, elem: T) {
         self.insert(elem);
     }
 
@@ -471,7 +471,7 @@ impl<T: Idx> GenKill<T> for BitSet<T> {
 }
 
 impl<T: Idx> GenKill<T> for ChunkedBitSet<T> {
-    fn gen(&mut self, elem: T) {
+    fn gen_(&mut self, elem: T) {
         self.insert(elem);
     }
 
@@ -481,11 +481,11 @@ impl<T: Idx> GenKill<T> for ChunkedBitSet<T> {
 }
 
 impl<T, S: GenKill<T>> GenKill<T> for MaybeReachable<S> {
-    fn gen(&mut self, elem: T) {
+    fn gen_(&mut self, elem: T) {
         match self {
             // If the state is not reachable, adding an element does nothing.
             MaybeReachable::Unreachable => {}
-            MaybeReachable::Reachable(set) => set.gen(elem),
+            MaybeReachable::Reachable(set) => set.gen_(elem),
         }
     }
 
@@ -499,7 +499,7 @@ impl<T, S: GenKill<T>> GenKill<T> for MaybeReachable<S> {
 }
 
 impl<T: Idx> GenKill<T> for lattice::Dual<BitSet<T>> {
-    fn gen(&mut self, elem: T) {
+    fn gen_(&mut self, elem: T) {
         self.0.insert(elem);
     }
 

compiler/rustc_mir_dataflow/src/impls/borrowed_locals.rs

@@ -97,7 +97,7 @@ where
             Rvalue::AddressOf(_, borrowed_place)
             | Rvalue::Ref(_, BorrowKind::Mut { .. } | BorrowKind::Shared, borrowed_place) => {
                 if !borrowed_place.is_indirect() {
-                    self.trans.gen(borrowed_place.local);
+                    self.trans.gen_(borrowed_place.local);
                 }
             }
 
@@ -131,7 +131,7 @@ where
                 //
                 // [#61069]: https://github.com/rust-lang/rust/pull/61069
                 if !dropped_place.is_indirect() {
-                    self.trans.gen(dropped_place.local);
+                    self.trans.gen_(dropped_place.local);
                 }
             }
 
@@ -159,8 +159,8 @@ pub fn borrowed_locals(body: &Body<'_>) -> BitSet<Local> {
 
     impl GenKill<Local> for Borrowed {
         #[inline]
-        fn gen(&mut self, elem: Local) {
-            self.0.gen(elem)
+        fn gen_(&mut self, elem: Local) {
+            self.0.gen_(elem)
         }
         #[inline]
         fn kill(&mut self, _: Local) {

compiler/rustc_mir_dataflow/src/impls/initialized.rs

@@ -283,7 +283,7 @@ impl<'a, 'mir, 'tcx> MaybeInitializedPlaces<'a, 'mir, 'tcx> {
     ) {
         match state {
             DropFlagState::Absent => trans.kill(path),
-            DropFlagState::Present => trans.gen(path),
+            DropFlagState::Present => trans.gen_(path),
         }
     }
 }
@@ -295,7 +295,7 @@ impl<'a, 'tcx> MaybeUninitializedPlaces<'a, '_, 'tcx> {
         state: DropFlagState,
     ) {
         match state {
-            DropFlagState::Absent => trans.gen(path),
+            DropFlagState::Absent => trans.gen_(path),
             DropFlagState::Present => trans.kill(path),
         }
     }
@@ -309,7 +309,7 @@ impl<'a, 'tcx> DefinitelyInitializedPlaces<'a, 'tcx> {
     ) {
         match state {
             DropFlagState::Absent => trans.kill(path),
-            DropFlagState::Present => trans.gen(path),
+            DropFlagState::Present => trans.gen_(path),
         }
     }
 }
@@ -331,7 +331,7 @@ impl<'tcx> AnalysisDomain<'tcx> for MaybeInitializedPlaces<'_, '_, 'tcx> {
             MaybeReachable::Reachable(ChunkedBitSet::new_empty(self.move_data().move_paths.len()));
         drop_flag_effects_for_function_entry(self.body, self.mdpe, |path, s| {
             assert!(s == DropFlagState::Present);
-            state.gen(path);
+            state.gen_(path);
         });
     }
 }
@@ -362,7 +362,7 @@ impl<'tcx> GenKillAnalysis<'tcx> for MaybeInitializedPlaces<'_, '_, 'tcx> {
             && let LookupResult::Exact(mpi) = self.move_data().rev_lookup.find(place.as_ref())
         {
             on_all_children_bits(self.move_data(), mpi, |child| {
-                trans.gen(child);
+                trans.gen_(child);
             })
         }
     }
@@ -400,7 +400,7 @@ impl<'tcx> GenKillAnalysis<'tcx> for MaybeInitializedPlaces<'_, '_, 'tcx> {
                 self.move_data(),
                 self.move_data().rev_lookup.find(place.as_ref()),
                 |mpi| {
-                    trans.gen(mpi);
+                    trans.gen_(mpi);
                 },
             );
         });
@@ -572,7 +572,7 @@ impl<'tcx> GenKillAnalysis<'tcx> for MaybeUninitializedPlaces<'_, '_, 'tcx> {
                 self.move_data(),
                 enum_place,
                 variant,
-                |mpi| trans.gen(mpi),
+                |mpi| trans.gen_(mpi),
             );
         });
     }
@@ -643,7 +643,7 @@ impl<'tcx> GenKillAnalysis<'tcx> for DefinitelyInitializedPlaces<'_, 'tcx> {
                 self.move_data(),
                 self.move_data().rev_lookup.find(place.as_ref()),
                 |mpi| {
-                    trans.gen(mpi);
+                    trans.gen_(mpi);
                 },
             );
         });
@@ -738,7 +738,7 @@ impl<'tcx> GenKillAnalysis<'tcx> for EverInitializedPlaces<'_, '_, 'tcx> {
 
         let call_loc = self.body.terminator_loc(block);
         for init_index in &init_loc_map[call_loc] {
-            trans.gen(*init_index);
+            trans.gen_(*init_index);
         }
     }
 }

compiler/rustc_mir_dataflow/src/impls/liveness.rs

@@ -116,7 +116,7 @@ where
                     self.0.kill(place.local);
                 }
             }
-            Some(DefUse::Use) => self.0.gen(place.local),
+            Some(DefUse::Use) => self.0.gen_(place.local),
             None => {}
         }
 
@@ -154,7 +154,7 @@ impl DefUse {
     fn apply(trans: &mut impl GenKill<Local>, place: Place<'_>, context: PlaceContext) {
         match DefUse::for_place(place, context) {
             Some(DefUse::Def) => trans.kill(place.local),
-            Some(DefUse::Use) => trans.gen(place.local),
+            Some(DefUse::Use) => trans.gen_(place.local),
             None => {}
         }
     }