rustc_ast/
visit.rs

1//! AST walker. Each overridden visit method has full control over what
2//! happens with its node, it can do its own traversal of the node's children,
3//! call `visit::walk_*` to apply the default traversal algorithm, or prevent
4//! deeper traversal by doing nothing.
5//!
6//! Note: it is an important invariant that the default visitor walks the body
7//! of a function in "execution order" (more concretely, reverse post-order
8//! with respect to the CFG implied by the AST), meaning that if AST node A may
9//! execute before AST node B, then A is visited first. The borrow checker in
10//! particular relies on this property.
11//!
12//! Note: walking an AST before macro expansion is probably a bad idea. For
13//! instance, a walker looking for item names in a module will miss all of
14//! those that are created by the expansion of a macro.
15
16pub use rustc_ast_ir::visit::VisitorResult;
17pub use rustc_ast_ir::{try_visit, visit_opt, walk_list, walk_visitable_list};
18use rustc_span::{Ident, Span};
19use thin_vec::ThinVec;
20
21use crate::ast::*;
22use crate::ptr::P;
23
24#[derive(Copy, Clone, Debug, PartialEq)]
25pub enum AssocCtxt {
26    Trait,
27    Impl { of_trait: bool },
28}
29
30#[derive(Copy, Clone, Debug, PartialEq)]
31pub enum FnCtxt {
32    Free,
33    Foreign,
34    Assoc(AssocCtxt),
35}
36
37#[derive(Copy, Clone, Debug)]
38pub enum BoundKind {
39    /// Trait bounds in generics bounds and type/trait alias.
40    /// E.g., `<T: Bound>`, `type A: Bound`, or `where T: Bound`.
41    Bound,
42
43    /// Trait bounds in `impl` type.
44    /// E.g., `type Foo = impl Bound1 + Bound2 + Bound3`.
45    Impl,
46
47    /// Trait bounds in trait object type.
48    /// E.g., `dyn Bound1 + Bound2 + Bound3`.
49    TraitObject,
50
51    /// Super traits of a trait.
52    /// E.g., `trait A: B`
53    SuperTraits,
54}
55impl BoundKind {
56    pub fn descr(self) -> &'static str {
57        match self {
58            BoundKind::Bound => "bounds",
59            BoundKind::Impl => "`impl Trait`",
60            BoundKind::TraitObject => "`dyn` trait object bounds",
61            BoundKind::SuperTraits => "supertrait bounds",
62        }
63    }
64}
65
66#[derive(Copy, Clone, Debug)]
67pub enum FnKind<'a> {
68    /// E.g., `fn foo()`, `fn foo(&self)`, or `extern "Abi" fn foo()`.
69    Fn(FnCtxt, &'a Visibility, &'a Fn),
70
71    /// E.g., `|x, y| body`.
72    Closure(&'a ClosureBinder, &'a Option<CoroutineKind>, &'a FnDecl, &'a Expr),
73}
74
75impl<'a> FnKind<'a> {
76    pub fn header(&self) -> Option<&'a FnHeader> {
77        match *self {
78            FnKind::Fn(_, _, Fn { sig, .. }) => Some(&sig.header),
79            FnKind::Closure(..) => None,
80        }
81    }
82
83    pub fn ident(&self) -> Option<&Ident> {
84        match self {
85            FnKind::Fn(_, _, Fn { ident, .. }) => Some(ident),
86            _ => None,
87        }
88    }
89
90    pub fn decl(&self) -> &'a FnDecl {
91        match self {
92            FnKind::Fn(_, _, Fn { sig, .. }) => &sig.decl,
93            FnKind::Closure(_, _, decl, _) => decl,
94        }
95    }
96
97    pub fn ctxt(&self) -> Option<FnCtxt> {
98        match self {
99            FnKind::Fn(ctxt, ..) => Some(*ctxt),
100            FnKind::Closure(..) => None,
101        }
102    }
103}
104
105#[derive(Copy, Clone, Debug)]
106pub enum LifetimeCtxt {
107    /// Appears in a reference type.
108    Ref,
109    /// Appears as a bound on a type or another lifetime.
110    Bound,
111    /// Appears as a generic argument.
112    GenericArg,
113}
114
115/// Each method of the `Visitor` trait is a hook to be potentially
116/// overridden. Each method's default implementation recursively visits
117/// the substructure of the input via the corresponding `walk` method;
118/// e.g., the `visit_item` method by default calls `visit::walk_item`.
119///
120/// If you want to ensure that your code handles every variant
121/// explicitly, you need to override each method. (And you also need
122/// to monitor future changes to `Visitor` in case a new method with a
123/// new default implementation gets introduced.)
124pub trait Visitor<'ast>: Sized {
125    /// The result type of the `visit_*` methods. Can be either `()`,
126    /// or `ControlFlow<T>`.
127    type Result: VisitorResult = ();
128
129    fn visit_ident(&mut self, _ident: &'ast Ident) -> Self::Result {
130        Self::Result::output()
131    }
132    fn visit_foreign_mod(&mut self, nm: &'ast ForeignMod) -> Self::Result {
133        walk_foreign_mod(self, nm)
134    }
135    fn visit_foreign_item(&mut self, i: &'ast ForeignItem) -> Self::Result {
136        walk_item(self, i)
137    }
138    fn visit_item(&mut self, i: &'ast Item) -> Self::Result {
139        walk_item(self, i)
140    }
141    fn visit_local(&mut self, l: &'ast Local) -> Self::Result {
142        walk_local(self, l)
143    }
144    fn visit_block(&mut self, b: &'ast Block) -> Self::Result {
145        walk_block(self, b)
146    }
147    fn visit_stmt(&mut self, s: &'ast Stmt) -> Self::Result {
148        walk_stmt(self, s)
149    }
150    fn visit_param(&mut self, param: &'ast Param) -> Self::Result {
151        walk_param(self, param)
152    }
153    fn visit_arm(&mut self, a: &'ast Arm) -> Self::Result {
154        walk_arm(self, a)
155    }
156    fn visit_pat(&mut self, p: &'ast Pat) -> Self::Result {
157        walk_pat(self, p)
158    }
159    fn visit_anon_const(&mut self, c: &'ast AnonConst) -> Self::Result {
160        walk_anon_const(self, c)
161    }
162    fn visit_expr(&mut self, ex: &'ast Expr) -> Self::Result {
163        walk_expr(self, ex)
164    }
165    /// This method is a hack to workaround unstable of `stmt_expr_attributes`.
166    /// It can be removed once that feature is stabilized.
167    fn visit_method_receiver_expr(&mut self, ex: &'ast Expr) -> Self::Result {
168        self.visit_expr(ex)
169    }
170    fn visit_ty(&mut self, t: &'ast Ty) -> Self::Result {
171        walk_ty(self, t)
172    }
173    fn visit_ty_pat(&mut self, t: &'ast TyPat) -> Self::Result {
174        walk_ty_pat(self, t)
175    }
176    fn visit_generic_param(&mut self, param: &'ast GenericParam) -> Self::Result {
177        walk_generic_param(self, param)
178    }
179    fn visit_generics(&mut self, g: &'ast Generics) -> Self::Result {
180        walk_generics(self, g)
181    }
182    fn visit_closure_binder(&mut self, b: &'ast ClosureBinder) -> Self::Result {
183        walk_closure_binder(self, b)
184    }
185    fn visit_contract(&mut self, c: &'ast FnContract) -> Self::Result {
186        walk_contract(self, c)
187    }
188    fn visit_where_predicate(&mut self, p: &'ast WherePredicate) -> Self::Result {
189        walk_where_predicate(self, p)
190    }
191    fn visit_where_predicate_kind(&mut self, k: &'ast WherePredicateKind) -> Self::Result {
192        walk_where_predicate_kind(self, k)
193    }
194    fn visit_fn(&mut self, fk: FnKind<'ast>, _: Span, _: NodeId) -> Self::Result {
195        walk_fn(self, fk)
196    }
197    fn visit_assoc_item(&mut self, i: &'ast AssocItem, ctxt: AssocCtxt) -> Self::Result {
198        walk_assoc_item(self, i, ctxt)
199    }
200    fn visit_trait_ref(&mut self, t: &'ast TraitRef) -> Self::Result {
201        walk_trait_ref(self, t)
202    }
203    fn visit_param_bound(&mut self, bounds: &'ast GenericBound, _ctxt: BoundKind) -> Self::Result {
204        walk_param_bound(self, bounds)
205    }
206    fn visit_precise_capturing_arg(&mut self, arg: &'ast PreciseCapturingArg) -> Self::Result {
207        walk_precise_capturing_arg(self, arg)
208    }
209    fn visit_poly_trait_ref(&mut self, t: &'ast PolyTraitRef) -> Self::Result {
210        walk_poly_trait_ref(self, t)
211    }
212    fn visit_variant_data(&mut self, s: &'ast VariantData) -> Self::Result {
213        walk_struct_def(self, s)
214    }
215    fn visit_field_def(&mut self, s: &'ast FieldDef) -> Self::Result {
216        walk_field_def(self, s)
217    }
218    fn visit_enum_def(&mut self, enum_definition: &'ast EnumDef) -> Self::Result {
219        walk_enum_def(self, enum_definition)
220    }
221    fn visit_variant(&mut self, v: &'ast Variant) -> Self::Result {
222        walk_variant(self, v)
223    }
224    fn visit_variant_discr(&mut self, discr: &'ast AnonConst) -> Self::Result {
225        self.visit_anon_const(discr)
226    }
227    fn visit_label(&mut self, label: &'ast Label) -> Self::Result {
228        walk_label(self, label)
229    }
230    fn visit_lifetime(&mut self, lifetime: &'ast Lifetime, _: LifetimeCtxt) -> Self::Result {
231        walk_lifetime(self, lifetime)
232    }
233    fn visit_mac_call(&mut self, mac: &'ast MacCall) -> Self::Result {
234        walk_mac(self, mac)
235    }
236    fn visit_macro_def(&mut self, _mac: &'ast MacroDef, _id: NodeId) -> Self::Result {
237        Self::Result::output()
238    }
239    fn visit_path(&mut self, path: &'ast Path, _id: NodeId) -> Self::Result {
240        walk_path(self, path)
241    }
242    fn visit_use_tree(
243        &mut self,
244        use_tree: &'ast UseTree,
245        id: NodeId,
246        _nested: bool,
247    ) -> Self::Result {
248        walk_use_tree(self, use_tree, id)
249    }
250    fn visit_path_segment(&mut self, path_segment: &'ast PathSegment) -> Self::Result {
251        walk_path_segment(self, path_segment)
252    }
253    fn visit_generic_args(&mut self, generic_args: &'ast GenericArgs) -> Self::Result {
254        walk_generic_args(self, generic_args)
255    }
256    fn visit_generic_arg(&mut self, generic_arg: &'ast GenericArg) -> Self::Result {
257        walk_generic_arg(self, generic_arg)
258    }
259    fn visit_assoc_item_constraint(
260        &mut self,
261        constraint: &'ast AssocItemConstraint,
262    ) -> Self::Result {
263        walk_assoc_item_constraint(self, constraint)
264    }
265    fn visit_attribute(&mut self, attr: &'ast Attribute) -> Self::Result {
266        walk_attribute(self, attr)
267    }
268    fn visit_vis(&mut self, vis: &'ast Visibility) -> Self::Result {
269        walk_vis(self, vis)
270    }
271    fn visit_fn_ret_ty(&mut self, ret_ty: &'ast FnRetTy) -> Self::Result {
272        walk_fn_ret_ty(self, ret_ty)
273    }
274    fn visit_fn_header(&mut self, header: &'ast FnHeader) -> Self::Result {
275        walk_fn_header(self, header)
276    }
277    fn visit_expr_field(&mut self, f: &'ast ExprField) -> Self::Result {
278        walk_expr_field(self, f)
279    }
280    fn visit_pat_field(&mut self, fp: &'ast PatField) -> Self::Result {
281        walk_pat_field(self, fp)
282    }
283    fn visit_crate(&mut self, krate: &'ast Crate) -> Self::Result {
284        walk_crate(self, krate)
285    }
286    fn visit_inline_asm(&mut self, asm: &'ast InlineAsm) -> Self::Result {
287        walk_inline_asm(self, asm)
288    }
289    fn visit_format_args(&mut self, fmt: &'ast FormatArgs) -> Self::Result {
290        walk_format_args(self, fmt)
291    }
292    fn visit_inline_asm_sym(&mut self, sym: &'ast InlineAsmSym) -> Self::Result {
293        walk_inline_asm_sym(self, sym)
294    }
295    fn visit_capture_by(&mut self, _capture_by: &'ast CaptureBy) -> Self::Result {
296        Self::Result::output()
297    }
298    fn visit_coroutine_kind(&mut self, _coroutine_kind: &'ast CoroutineKind) -> Self::Result {
299        Self::Result::output()
300    }
301    fn visit_fn_decl(&mut self, fn_decl: &'ast FnDecl) -> Self::Result {
302        walk_fn_decl(self, fn_decl)
303    }
304    fn visit_qself(&mut self, qs: &'ast Option<P<QSelf>>) -> Self::Result {
305        walk_qself(self, qs)
306    }
307}
308
309#[macro_export]
310macro_rules! common_visitor_and_walkers {
311    ($(($mut: ident))? $Visitor:ident$(<$lt:lifetime>)?) => {
312        pub trait WalkItemKind {
313            type Ctxt;
314            fn walk<$($lt,)? V: $Visitor$(<$lt>)?>(
315                &$($lt)? $($mut)? self,
316                span: Span,
317                id: NodeId,
318                visibility: &$($lt)? $($mut)? Visibility,
319                ctxt: Self::Ctxt,
320                visitor: &mut V,
321            ) $(-> <V as Visitor<$lt>>::Result)?;
322        }
323
324        // this is only used by the MutVisitor. We include this symmetry here to make writing other functions easier
325        $(${ignore($lt)}
326            #[expect(unused, rustc::pass_by_value)]
327            #[inline]
328        )?
329        fn visit_span<$($lt,)? V: $Visitor$(<$lt>)?>(visitor: &mut V, span: &$($lt)? $($mut)? Span) $(-> <V as Visitor<$lt>>::Result)? {
330            $(
331                ${ignore($mut)}
332                visitor.visit_span(span);
333            )?
334            $(${ignore($lt)}V::Result::output())?
335        }
336
337        // this is only used by the MutVisitor. We include this symmetry here to make writing other functions easier
338        $(${ignore($lt)}
339            #[expect(unused, rustc::pass_by_value)]
340            #[inline]
341        )?
342        fn visit_id<$($lt,)? V: $Visitor$(<$lt>)?>(visitor: &mut V, id: &$($lt)? $($mut)? NodeId) $(-> <V as Visitor<$lt>>::Result)? {
343            $(
344                ${ignore($mut)}
345                visitor.visit_id(id);
346            )?
347            $(${ignore($lt)}V::Result::output())?
348        }
349
350        // this is only used by the MutVisitor. We include this symmetry here to make writing other functions easier
351        fn visit_safety<$($lt,)? V: $Visitor$(<$lt>)?>(vis: &mut V, safety: &$($lt)? $($mut)? Safety) $(-> <V as Visitor<$lt>>::Result)? {
352            match safety {
353                Safety::Unsafe(span) => visit_span(vis, span),
354                Safety::Safe(span) => visit_span(vis, span),
355                Safety::Default => { $(${ignore($lt)}V::Result::output())? }
356            }
357        }
358
359        fn visit_constness<$($lt,)? V: $Visitor$(<$lt>)?>(vis: &mut V, constness: &$($lt)? $($mut)? Const) $(-> <V as Visitor<$lt>>::Result)? {
360            match constness {
361                Const::Yes(span) => visit_span(vis, span),
362                Const::No => {
363                    $(<V as Visitor<$lt>>::Result::output())?
364                }
365            }
366        }
367
368        fn visit_defaultness<$($lt,)? V: $Visitor$(<$lt>)?>(vis: &mut V, defaultness: &$($lt)? $($mut)? Defaultness) $(-> <V as Visitor<$lt>>::Result)? {
369            match defaultness {
370                Defaultness::Default(span) => visit_span(vis, span),
371                Defaultness::Final => {
372                    $(<V as Visitor<$lt>>::Result::output())?
373                }
374            }
375        }
376
377        fn visit_polarity<$($lt,)? V: $Visitor$(<$lt>)?>(vis: &mut V, polarity: &$($lt)? $($mut)? ImplPolarity) $(-> <V as Visitor<$lt>>::Result)? {
378            match polarity {
379                ImplPolarity::Positive => { $(<V as Visitor<$lt>>::Result::output())? }
380                ImplPolarity::Negative(span) => visit_span(vis, span),
381            }
382        }
383
384        fn visit_bounds<$($lt,)? V: $Visitor$(<$lt>)?>(visitor: &mut V, bounds: &$($lt)? $($mut)? GenericBounds, ctxt: BoundKind) $(-> <V as Visitor<$lt>>::Result)? {
385            walk_list!(visitor, visit_param_bound, bounds, ctxt);
386            $(<V as Visitor<$lt>>::Result::output())?
387        }
388
389        pub fn walk_label<$($lt,)? V: $Visitor$(<$lt>)?>(visitor: &mut V, Label { ident }: &$($lt)? $($mut)? Label) $(-> <V as Visitor<$lt>>::Result)? {
390            visitor.visit_ident(ident)
391        }
392
393        pub fn walk_fn_header<$($lt,)? V: $Visitor$(<$lt>)?>(visitor: &mut V, header: &$($lt)? $($mut)? FnHeader) $(-> <V as Visitor<$lt>>::Result)? {
394            let FnHeader { safety, coroutine_kind, constness, ext: _ } = header;
395            try_visit!(visit_constness(visitor, constness));
396            visit_opt!(visitor, visit_coroutine_kind, coroutine_kind);
397            visit_safety(visitor, safety)
398        }
399
400        pub fn walk_lifetime<$($lt,)? V: $Visitor$(<$lt>)?>(visitor: &mut V, Lifetime { id, ident }: &$($lt)? $($mut)? Lifetime) $(-> <V as Visitor<$lt>>::Result)? {
401            try_visit!(visit_id(visitor, id));
402            visitor.visit_ident(ident)
403        }
404
405        fn walk_item_ctxt<$($lt,)? V: $Visitor$(<$lt>)?, K: WalkItemKind>(
406            visitor: &mut V,
407            item: &$($mut)? $($lt)? Item<K>,
408            ctxt: K::Ctxt,
409        ) $(-> <V as Visitor<$lt>>::Result)? {
410            let Item { attrs, id, kind, vis, span, tokens: _ } = item;
411            try_visit!(visit_id(visitor, id));
412            walk_list!(visitor, visit_attribute, attrs);
413            try_visit!(visitor.visit_vis(vis));
414            try_visit!(kind.walk(*span, *id, vis, ctxt, visitor));
415            visit_span(visitor, span)
416        }
417
418        pub fn walk_item<$($lt,)? V: $Visitor$(<$lt>)?, K: WalkItemKind<Ctxt = ()>>(
419            visitor: &mut V,
420            item: &$($mut)? $($lt)? Item<K>,
421        ) $(-> <V as Visitor<$lt>>::Result)? {
422            walk_item_ctxt(visitor, item, ())
423        }
424
425        pub fn walk_assoc_item<$($lt,)? V: $Visitor$(<$lt>)?>(
426            visitor: &mut V,
427            item: &$($mut)? $($lt)? AssocItem,
428            ctxt: AssocCtxt,
429        ) $(-> <V as Visitor<$lt>>::Result)? {
430            walk_item_ctxt(visitor, item, ctxt)
431        }
432
433        impl WalkItemKind for ItemKind {
434            type Ctxt = ();
435            fn walk<$($lt,)? V: $Visitor$(<$lt>)?>(
436                &$($lt)? $($mut)? self,
437                span: Span,
438                id: NodeId,
439                visibility: &$($lt)? $($mut)? Visibility,
440                _ctxt: Self::Ctxt,
441                vis: &mut V,
442            ) $(-> <V as Visitor<$lt>>::Result)? {
443                match self {
444                    ItemKind::ExternCrate(_orig_name, ident) => vis.visit_ident(ident),
445                    // FIXME(fee1-dead): look into this weird assymetry
446                    ItemKind::Use(use_tree) => vis.visit_use_tree(use_tree$(${ignore($lt)}, id, false)?),
447                    ItemKind::Static(box StaticItem {
448                        ident,
449                        ty,
450                        safety: _,
451                        mutability: _,
452                        expr,
453                        define_opaque,
454                    }) => {
455                        try_visit!(vis.visit_ident(ident));
456                        try_visit!(vis.visit_ty(ty));
457                        visit_opt!(vis, visit_expr, expr);
458                        walk_define_opaques(vis, define_opaque)
459                    }
460                    ItemKind::Const(item) => {
461                        walk_const_item(vis, item)
462                    }
463                    ItemKind::Fn(func) => {
464                        let kind = FnKind::Fn(FnCtxt::Free, visibility, &$($mut)? *func);
465                        vis.visit_fn(kind, span, id)
466                    }
467                    ItemKind::Mod(safety, ident, mod_kind) => {
468                        try_visit!(visit_safety(vis, safety));
469                        try_visit!(vis.visit_ident(ident));
470                        match mod_kind {
471                            ModKind::Loaded(
472                                items,
473                                _inline,
474                                ModSpans { inner_span, inject_use_span },
475                                _,
476                            ) => {
477                                $(${ignore($mut)}
478                                    items.flat_map_in_place(|item| vis.flat_map_item(item));
479                                )?
480                                $(${ignore($lt)}
481                                    walk_list!(vis, visit_item, items);
482                                )?
483                                try_visit!(visit_span(vis, inner_span));
484                                try_visit!(visit_span(vis, inject_use_span));
485                            }
486                            ModKind::Unloaded => {}
487                        }
488                        $(<V as Visitor<$lt>>::Result::output())?
489                    }
490                    ItemKind::ForeignMod(nm) => vis.visit_foreign_mod(nm),
491                    ItemKind::GlobalAsm(asm) => vis.visit_inline_asm(asm),
492                    ItemKind::TyAlias(box TyAlias {
493                        defaultness,
494                        ident,
495                        generics,
496                        $(${ignore($lt)} #[expect(unused)])?
497                        where_clauses,
498                        bounds,
499                        ty,
500                    }) => {
501                        try_visit!(visit_defaultness(vis, defaultness));
502                        try_visit!(vis.visit_ident(ident));
503                        try_visit!(vis.visit_generics(generics));
504                        try_visit!(visit_bounds(vis, bounds, BoundKind::Bound));
505                        visit_opt!(vis, visit_ty, ty);
506                        $(${ignore($mut)}
507                            walk_ty_alias_where_clauses(vis, where_clauses);
508                        )?
509                        $(<V as Visitor<$lt>>::Result::output())?
510                    }
511                    ItemKind::Enum(ident, generics, enum_definition) => {
512                        try_visit!(vis.visit_ident(ident));
513                        try_visit!(vis.visit_generics(generics));
514                        $(${ignore($mut)}
515                            enum_definition.variants.flat_map_in_place(|variant| vis.flat_map_variant(variant));
516                        )?
517                        $(${ignore($lt)}vis.visit_enum_def(enum_definition))?
518                    }
519                    ItemKind::Struct(ident, generics, variant_data)
520                    | ItemKind::Union(ident, generics, variant_data) => {
521                        try_visit!(vis.visit_ident(ident));
522                        try_visit!(vis.visit_generics(generics));
523                        vis.visit_variant_data(variant_data)
524                    }
525                    ItemKind::Impl(box Impl {
526                        defaultness,
527                        safety,
528                        generics,
529                        constness,
530                        polarity,
531                        of_trait,
532                        self_ty,
533                        items,
534                    }) => {
535                        try_visit!(visit_defaultness(vis, defaultness));
536                        try_visit!(visit_safety(vis, safety));
537                        try_visit!(vis.visit_generics(generics));
538                        try_visit!(visit_constness(vis, constness));
539                        try_visit!(visit_polarity(vis, polarity));
540                        visit_opt!(vis, visit_trait_ref, of_trait);
541                        try_visit!(vis.visit_ty(self_ty));
542                        $(${ignore($mut)}
543                            items.flat_map_in_place(|item| {
544                                vis.flat_map_assoc_item(item, AssocCtxt::Impl { of_trait: of_trait.is_some() })
545                            });
546                        )?
547                        $(${ignore($lt)}
548                            walk_list!(
549                                vis,
550                                visit_assoc_item,
551                                items,
552                                AssocCtxt::Impl { of_trait: of_trait.is_some() }
553                            );
554                            <V as Visitor<$lt>>::Result::output()
555                        )?
556                    }
557                    ItemKind::Trait(box Trait { safety, is_auto: _, ident, generics, bounds, items }) => {
558                        try_visit!(visit_safety(vis, safety));
559                        try_visit!(vis.visit_ident(ident));
560                        try_visit!(vis.visit_generics(generics));
561                        try_visit!(visit_bounds(vis, bounds, BoundKind::Bound));
562                        $(${ignore($mut)}
563                            items.flat_map_in_place(|item| {
564                                vis.flat_map_assoc_item(item, AssocCtxt::Trait)
565                            });
566                        )?
567                        $(${ignore($lt)}
568                            walk_list!(vis, visit_assoc_item, items, AssocCtxt::Trait);
569                            <V as Visitor<$lt>>::Result::output()
570                        )?
571                    }
572                    ItemKind::TraitAlias(ident, generics, bounds) => {
573                        try_visit!(vis.visit_ident(ident));
574                        try_visit!(vis.visit_generics(generics));
575                        visit_bounds(vis, bounds, BoundKind::Bound)
576                    }
577                    ItemKind::MacCall(m) => vis.visit_mac_call(m),
578                    ItemKind::MacroDef(ident, def) => {
579                        try_visit!(vis.visit_ident(ident));
580                        // FIXME(fee1-dead) assymetry
581                        vis.visit_macro_def(def$(${ignore($lt)}, id)?)
582                    }
583                    ItemKind::Delegation(box Delegation {
584                        id,
585                        qself,
586                        path,
587                        ident,
588                        rename,
589                        body,
590                        from_glob: _,
591                    }) => {
592                        try_visit!(visit_id(vis, id));
593                        try_visit!(vis.visit_qself(qself));
594                        try_visit!(vis.visit_path(path$(${ignore($lt)}, *id)?));
595                        try_visit!(vis.visit_ident(ident));
596                        visit_opt!(vis, visit_ident, rename);
597                        visit_opt!(vis, visit_block, body);
598                        $(<V as Visitor<$lt>>::Result::output())?
599                    }
600                    ItemKind::DelegationMac(box DelegationMac { qself, prefix, suffixes, body }) => {
601                        try_visit!(vis.visit_qself(qself));
602                        try_visit!(vis.visit_path(prefix$(${ignore($lt)}, id)?));
603                        if let Some(suffixes) = suffixes {
604                            for (ident, rename) in suffixes {
605                                try_visit!(vis.visit_ident(ident));
606                                visit_opt!(vis, visit_ident, rename);
607                            }
608                        }
609                        visit_opt!(vis, visit_block, body);
610                        $(<V as Visitor<$lt>>::Result::output())?
611                    }
612                }
613            }
614        }
615
616        fn walk_const_item<$($lt,)? V: $Visitor$(<$lt>)?>(vis: &mut V, item: &$($lt)? $($mut)? ConstItem) $(-> <V as Visitor<$lt>>::Result)? {
617            let ConstItem { defaultness, ident, generics, ty, expr, define_opaque } = item;
618            try_visit!(visit_defaultness(vis, defaultness));
619            try_visit!(vis.visit_ident(ident));
620            try_visit!(vis.visit_generics(generics));
621            try_visit!(vis.visit_ty(ty));
622            visit_opt!(vis, visit_expr, expr);
623            walk_define_opaques(vis, define_opaque)
624        }
625
626        fn walk_foreign_mod<$($lt,)? V: $Visitor$(<$lt>)?>(vis: &mut V, foreign_mod: &$($lt)? $($mut)? ForeignMod) $(-> <V as Visitor<$lt>>::Result)? {
627            let ForeignMod { extern_span: _, safety, abi: _, items } = foreign_mod;
628            try_visit!(visit_safety(vis, safety));
629            $(${ignore($mut)}
630                items.flat_map_in_place(|item| vis.flat_map_foreign_item(item));
631            )?
632            $(
633                walk_list!(vis, visit_foreign_item, items);
634                <V as Visitor<$lt>>::Result::output()
635            )?
636        }
637
638        fn walk_define_opaques<$($lt,)? V: $Visitor$(<$lt>)?>(
639            visitor: &mut V,
640            define_opaque: &$($lt)? $($mut)? Option<ThinVec<(NodeId, Path)>>,
641        ) $(-> <V as Visitor<$lt>>::Result)? {
642            if let Some(define_opaque) = define_opaque {
643                for (id, path) in define_opaque {
644                    try_visit!(visit_id(visitor, id));
645                    // FIXME(fee1-dead): look into this weird assymetry
646                    try_visit!(visitor.visit_path(path$(${ignore($lt)}, *id)?));
647                }
648            }
649            $(<V as Visitor<$lt>>::Result::output())?
650        }
651
652        impl WalkItemKind for AssocItemKind {
653            type Ctxt = AssocCtxt;
654            fn walk<$($lt,)? V: $Visitor$(<$lt>)?>(
655                &$($lt)? $($mut)? self,
656                span: Span,
657                id: NodeId,
658                visibility: &$($lt)? $($mut)? Visibility,
659                ctxt: Self::Ctxt,
660                vis: &mut V,
661            ) $(-> <V as Visitor<$lt>>::Result)? {
662                match self {
663                    AssocItemKind::Const(item) => {
664                        walk_const_item(vis, item)
665                    }
666                    AssocItemKind::Fn(func) => {
667                        vis.visit_fn(FnKind::Fn(FnCtxt::Assoc(ctxt), visibility, &$($mut)? *func), span, id)
668                    }
669                    AssocItemKind::Type(box TyAlias {
670                        generics,
671                        ident,
672                        bounds,
673                        ty,
674                        defaultness,
675                        $(${ignore($lt)} #[expect(unused)])?
676                        where_clauses,
677                    }) => {
678                        try_visit!(visit_defaultness(vis, defaultness));
679                        try_visit!(vis.visit_ident(ident));
680                        try_visit!(vis.visit_generics(generics));
681                        try_visit!(visit_bounds(vis, bounds, BoundKind::Bound));
682                        visit_opt!(vis, visit_ty, ty);
683                        $(${ignore($mut)}
684                            walk_ty_alias_where_clauses(vis, where_clauses);
685                        )?
686                        $(<V as Visitor<$lt>>::Result::output())?
687                    }
688                    AssocItemKind::MacCall(mac) => {
689                        vis.visit_mac_call(mac)
690                    }
691                    AssocItemKind::Delegation(box Delegation {
692                        id,
693                        qself,
694                        path,
695                        ident,
696                        rename,
697                        body,
698                        from_glob: _,
699                    }) => {
700                        try_visit!(visit_id(vis, id));
701                        try_visit!(vis.visit_qself(qself));
702                        try_visit!(vis.visit_path(path $(${ignore($lt)}, *id)?));
703                        try_visit!(vis.visit_ident(ident));
704                        visit_opt!(vis, visit_ident, rename);
705                        visit_opt!(vis, visit_block, body);
706                        $(<V as Visitor<$lt>>::Result::output())?
707                    }
708                    AssocItemKind::DelegationMac(box DelegationMac { qself, prefix, suffixes, body }) => {
709                        try_visit!(vis.visit_qself(qself));
710                        try_visit!(vis.visit_path(prefix$(${ignore($lt)}, id)?));
711                        if let Some(suffixes) = suffixes {
712                            for (ident, rename) in suffixes {
713                                try_visit!(vis.visit_ident(ident));
714                                visit_opt!(vis, visit_ident, rename);
715                            }
716                        }
717                        visit_opt!(vis, visit_block, body);
718                        $(<V as Visitor<$lt>>::Result::output())?
719                    }
720                }
721            }
722        }
723
724        impl WalkItemKind for ForeignItemKind {
725            type Ctxt = ();
726            fn walk<$($lt,)? V: $Visitor$(<$lt>)?>(
727                &$($lt)? $($mut)? self,
728                span: Span,
729                id: NodeId,
730                visibility: &$($lt)? $($mut)? Visibility,
731                _ctxt: Self::Ctxt,
732                vis: &mut V,
733            ) $(-> <V as Visitor<$lt>>::Result)? {
734                match self {
735                    ForeignItemKind::Static(box StaticItem {
736                        ident,
737                        ty,
738                        mutability: _,
739                        expr,
740                        safety: _,
741                        define_opaque,
742                    }) => {
743                        try_visit!(vis.visit_ident(ident));
744                        try_visit!(vis.visit_ty(ty));
745                        visit_opt!(vis, visit_expr, expr);
746                        walk_define_opaques(vis, define_opaque)
747                    }
748                    ForeignItemKind::Fn(func) => {
749                        vis.visit_fn(FnKind::Fn(FnCtxt::Foreign, visibility, &$($mut)?*func), span, id)
750                    }
751                    ForeignItemKind::TyAlias(box TyAlias {
752                        defaultness,
753                        ident,
754                        generics,
755                        bounds,
756                        ty,
757                        $(${ignore($lt)} #[expect(unused)])?
758                        where_clauses,
759                    }) => {
760                        try_visit!(visit_defaultness(vis, defaultness));
761                        try_visit!(vis.visit_ident(ident));
762                        try_visit!(vis.visit_generics(generics));
763                        try_visit!(visit_bounds(vis, bounds, BoundKind::Bound));
764                        visit_opt!(vis, visit_ty, ty);
765                        $(${ignore($mut)}
766                            walk_ty_alias_where_clauses(vis, where_clauses);
767                        )?
768                        $(<V as Visitor<$lt>>::Result::output())?
769                    }
770                    ForeignItemKind::MacCall(mac) => {
771                        vis.visit_mac_call(mac)
772                    }
773                }
774            }
775        }
776    };
777}
778
779common_visitor_and_walkers!(Visitor<'a>);
780
781pub fn walk_crate<'a, V: Visitor<'a>>(visitor: &mut V, krate: &'a Crate) -> V::Result {
782    let Crate { attrs, items, spans: _, id: _, is_placeholder: _ } = krate;
783    walk_list!(visitor, visit_attribute, attrs);
784    walk_list!(visitor, visit_item, items);
785    V::Result::output()
786}
787
788pub fn walk_local<'a, V: Visitor<'a>>(visitor: &mut V, local: &'a Local) -> V::Result {
789    let Local { id: _, super_: _, pat, ty, kind, span: _, colon_sp: _, attrs, tokens: _ } = local;
790    walk_list!(visitor, visit_attribute, attrs);
791    try_visit!(visitor.visit_pat(pat));
792    visit_opt!(visitor, visit_ty, ty);
793    if let Some((init, els)) = kind.init_else_opt() {
794        try_visit!(visitor.visit_expr(init));
795        visit_opt!(visitor, visit_block, els);
796    }
797    V::Result::output()
798}
799
800pub fn walk_poly_trait_ref<'a, V>(visitor: &mut V, trait_ref: &'a PolyTraitRef) -> V::Result
801where
802    V: Visitor<'a>,
803{
804    let PolyTraitRef { bound_generic_params, modifiers: _, trait_ref, span: _ } = trait_ref;
805    walk_list!(visitor, visit_generic_param, bound_generic_params);
806    visitor.visit_trait_ref(trait_ref)
807}
808
809pub fn walk_trait_ref<'a, V: Visitor<'a>>(visitor: &mut V, trait_ref: &'a TraitRef) -> V::Result {
810    let TraitRef { path, ref_id } = trait_ref;
811    visitor.visit_path(path, *ref_id)
812}
813
814pub fn walk_enum_def<'a, V: Visitor<'a>>(
815    visitor: &mut V,
816    EnumDef { variants }: &'a EnumDef,
817) -> V::Result {
818    walk_list!(visitor, visit_variant, variants);
819    V::Result::output()
820}
821
822pub fn walk_variant<'a, V: Visitor<'a>>(visitor: &mut V, variant: &'a Variant) -> V::Result
823where
824    V: Visitor<'a>,
825{
826    let Variant { attrs, id: _, span: _, vis, ident, data, disr_expr, is_placeholder: _ } = variant;
827    walk_list!(visitor, visit_attribute, attrs);
828    try_visit!(visitor.visit_vis(vis));
829    try_visit!(visitor.visit_ident(ident));
830    try_visit!(visitor.visit_variant_data(data));
831    visit_opt!(visitor, visit_variant_discr, disr_expr);
832    V::Result::output()
833}
834
835pub fn walk_expr_field<'a, V: Visitor<'a>>(visitor: &mut V, f: &'a ExprField) -> V::Result {
836    let ExprField { attrs, id: _, span: _, ident, expr, is_shorthand: _, is_placeholder: _ } = f;
837    walk_list!(visitor, visit_attribute, attrs);
838    try_visit!(visitor.visit_ident(ident));
839    try_visit!(visitor.visit_expr(expr));
840    V::Result::output()
841}
842
843pub fn walk_pat_field<'a, V: Visitor<'a>>(visitor: &mut V, fp: &'a PatField) -> V::Result {
844    let PatField { ident, pat, is_shorthand: _, attrs, id: _, span: _, is_placeholder: _ } = fp;
845    walk_list!(visitor, visit_attribute, attrs);
846    try_visit!(visitor.visit_ident(ident));
847    try_visit!(visitor.visit_pat(pat));
848    V::Result::output()
849}
850
851pub fn walk_ty<'a, V: Visitor<'a>>(visitor: &mut V, typ: &'a Ty) -> V::Result {
852    let Ty { id, kind, span: _, tokens: _ } = typ;
853    match kind {
854        TyKind::Slice(ty) | TyKind::Paren(ty) => try_visit!(visitor.visit_ty(ty)),
855        TyKind::Ptr(MutTy { ty, mutbl: _ }) => try_visit!(visitor.visit_ty(ty)),
856        TyKind::Ref(opt_lifetime, MutTy { ty, mutbl: _ })
857        | TyKind::PinnedRef(opt_lifetime, MutTy { ty, mutbl: _ }) => {
858            visit_opt!(visitor, visit_lifetime, opt_lifetime, LifetimeCtxt::Ref);
859            try_visit!(visitor.visit_ty(ty));
860        }
861        TyKind::Tup(tuple_element_types) => {
862            walk_list!(visitor, visit_ty, tuple_element_types);
863        }
864        TyKind::BareFn(function_declaration) => {
865            let BareFnTy { safety: _, ext: _, generic_params, decl, decl_span: _ } =
866                &**function_declaration;
867            walk_list!(visitor, visit_generic_param, generic_params);
868            try_visit!(visitor.visit_fn_decl(decl));
869        }
870        TyKind::UnsafeBinder(binder) => {
871            walk_list!(visitor, visit_generic_param, &binder.generic_params);
872            try_visit!(visitor.visit_ty(&binder.inner_ty));
873        }
874        TyKind::Path(maybe_qself, path) => {
875            try_visit!(visitor.visit_qself(maybe_qself));
876            try_visit!(visitor.visit_path(path, *id));
877        }
878        TyKind::Pat(ty, pat) => {
879            try_visit!(visitor.visit_ty(ty));
880            try_visit!(visitor.visit_ty_pat(pat));
881        }
882        TyKind::Array(ty, length) => {
883            try_visit!(visitor.visit_ty(ty));
884            try_visit!(visitor.visit_anon_const(length));
885        }
886        TyKind::TraitObject(bounds, _syntax) => {
887            walk_list!(visitor, visit_param_bound, bounds, BoundKind::TraitObject);
888        }
889        TyKind::ImplTrait(_id, bounds) => {
890            walk_list!(visitor, visit_param_bound, bounds, BoundKind::Impl);
891        }
892        TyKind::Typeof(expression) => try_visit!(visitor.visit_anon_const(expression)),
893        TyKind::Infer | TyKind::ImplicitSelf | TyKind::Dummy => {}
894        TyKind::Err(_guar) => {}
895        TyKind::MacCall(mac) => try_visit!(visitor.visit_mac_call(mac)),
896        TyKind::Never | TyKind::CVarArgs => {}
897    }
898    V::Result::output()
899}
900
901pub fn walk_ty_pat<'a, V: Visitor<'a>>(visitor: &mut V, tp: &'a TyPat) -> V::Result {
902    let TyPat { id: _, kind, span: _, tokens: _ } = tp;
903    match kind {
904        TyPatKind::Range(start, end, _include_end) => {
905            visit_opt!(visitor, visit_anon_const, start);
906            visit_opt!(visitor, visit_anon_const, end);
907        }
908        TyPatKind::Or(variants) => walk_list!(visitor, visit_ty_pat, variants),
909        TyPatKind::Err(_) => {}
910    }
911    V::Result::output()
912}
913
914fn walk_qself<'a, V: Visitor<'a>>(visitor: &mut V, qself: &'a Option<P<QSelf>>) -> V::Result {
915    if let Some(qself) = qself {
916        let QSelf { ty, path_span: _, position: _ } = &**qself;
917        try_visit!(visitor.visit_ty(ty));
918    }
919    V::Result::output()
920}
921
922pub fn walk_path<'a, V: Visitor<'a>>(visitor: &mut V, path: &'a Path) -> V::Result {
923    let Path { span: _, segments, tokens: _ } = path;
924    walk_list!(visitor, visit_path_segment, segments);
925    V::Result::output()
926}
927
928pub fn walk_use_tree<'a, V: Visitor<'a>>(
929    visitor: &mut V,
930    use_tree: &'a UseTree,
931    id: NodeId,
932) -> V::Result {
933    let UseTree { prefix, kind, span: _ } = use_tree;
934    try_visit!(visitor.visit_path(prefix, id));
935    match kind {
936        UseTreeKind::Simple(rename) => {
937            // The extra IDs are handled during AST lowering.
938            visit_opt!(visitor, visit_ident, rename);
939        }
940        UseTreeKind::Glob => {}
941        UseTreeKind::Nested { items, span: _ } => {
942            for &(ref nested_tree, nested_id) in items {
943                try_visit!(visitor.visit_use_tree(nested_tree, nested_id, true));
944            }
945        }
946    }
947    V::Result::output()
948}
949
950pub fn walk_path_segment<'a, V: Visitor<'a>>(
951    visitor: &mut V,
952    segment: &'a PathSegment,
953) -> V::Result {
954    let PathSegment { ident, id: _, args } = segment;
955    try_visit!(visitor.visit_ident(ident));
956    visit_opt!(visitor, visit_generic_args, args);
957    V::Result::output()
958}
959
960pub fn walk_generic_args<'a, V>(visitor: &mut V, generic_args: &'a GenericArgs) -> V::Result
961where
962    V: Visitor<'a>,
963{
964    match generic_args {
965        GenericArgs::AngleBracketed(AngleBracketedArgs { span: _, args }) => {
966            for arg in args {
967                match arg {
968                    AngleBracketedArg::Arg(a) => try_visit!(visitor.visit_generic_arg(a)),
969                    AngleBracketedArg::Constraint(c) => {
970                        try_visit!(visitor.visit_assoc_item_constraint(c))
971                    }
972                }
973            }
974        }
975        GenericArgs::Parenthesized(data) => {
976            let ParenthesizedArgs { span: _, inputs, inputs_span: _, output } = data;
977            walk_list!(visitor, visit_ty, inputs);
978            try_visit!(visitor.visit_fn_ret_ty(output));
979        }
980        GenericArgs::ParenthesizedElided(_span) => {}
981    }
982    V::Result::output()
983}
984
985pub fn walk_generic_arg<'a, V>(visitor: &mut V, generic_arg: &'a GenericArg) -> V::Result
986where
987    V: Visitor<'a>,
988{
989    match generic_arg {
990        GenericArg::Lifetime(lt) => visitor.visit_lifetime(lt, LifetimeCtxt::GenericArg),
991        GenericArg::Type(ty) => visitor.visit_ty(ty),
992        GenericArg::Const(ct) => visitor.visit_anon_const(ct),
993    }
994}
995
996pub fn walk_assoc_item_constraint<'a, V: Visitor<'a>>(
997    visitor: &mut V,
998    constraint: &'a AssocItemConstraint,
999) -> V::Result {
1000    let AssocItemConstraint { id: _, ident, gen_args, kind, span: _ } = constraint;
1001    try_visit!(visitor.visit_ident(ident));
1002    visit_opt!(visitor, visit_generic_args, gen_args);
1003    match kind {
1004        AssocItemConstraintKind::Equality { term } => match term {
1005            Term::Ty(ty) => try_visit!(visitor.visit_ty(ty)),
1006            Term::Const(c) => try_visit!(visitor.visit_anon_const(c)),
1007        },
1008        AssocItemConstraintKind::Bound { bounds } => {
1009            walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound);
1010        }
1011    }
1012    V::Result::output()
1013}
1014
1015pub fn walk_pat<'a, V: Visitor<'a>>(visitor: &mut V, pattern: &'a Pat) -> V::Result {
1016    let Pat { id, kind, span: _, tokens: _ } = pattern;
1017    match kind {
1018        PatKind::TupleStruct(opt_qself, path, elems) => {
1019            try_visit!(visitor.visit_qself(opt_qself));
1020            try_visit!(visitor.visit_path(path, *id));
1021            walk_list!(visitor, visit_pat, elems);
1022        }
1023        PatKind::Path(opt_qself, path) => {
1024            try_visit!(visitor.visit_qself(opt_qself));
1025            try_visit!(visitor.visit_path(path, *id))
1026        }
1027        PatKind::Struct(opt_qself, path, fields, _rest) => {
1028            try_visit!(visitor.visit_qself(opt_qself));
1029            try_visit!(visitor.visit_path(path, *id));
1030            walk_list!(visitor, visit_pat_field, fields);
1031        }
1032        PatKind::Box(subpattern) | PatKind::Deref(subpattern) | PatKind::Paren(subpattern) => {
1033            try_visit!(visitor.visit_pat(subpattern));
1034        }
1035        PatKind::Ref(subpattern, _ /*mutbl*/) => {
1036            try_visit!(visitor.visit_pat(subpattern));
1037        }
1038        PatKind::Ident(_bmode, ident, optional_subpattern) => {
1039            try_visit!(visitor.visit_ident(ident));
1040            visit_opt!(visitor, visit_pat, optional_subpattern);
1041        }
1042        PatKind::Expr(expression) => try_visit!(visitor.visit_expr(expression)),
1043        PatKind::Range(lower_bound, upper_bound, _end) => {
1044            visit_opt!(visitor, visit_expr, lower_bound);
1045            visit_opt!(visitor, visit_expr, upper_bound);
1046        }
1047        PatKind::Guard(subpattern, guard_condition) => {
1048            try_visit!(visitor.visit_pat(subpattern));
1049            try_visit!(visitor.visit_expr(guard_condition));
1050        }
1051        PatKind::Missing | PatKind::Wild | PatKind::Rest | PatKind::Never => {}
1052        PatKind::Err(_guar) => {}
1053        PatKind::Tuple(elems) | PatKind::Slice(elems) | PatKind::Or(elems) => {
1054            walk_list!(visitor, visit_pat, elems);
1055        }
1056        PatKind::MacCall(mac) => try_visit!(visitor.visit_mac_call(mac)),
1057    }
1058    V::Result::output()
1059}
1060
1061pub fn walk_param_bound<'a, V: Visitor<'a>>(visitor: &mut V, bound: &'a GenericBound) -> V::Result {
1062    match bound {
1063        GenericBound::Trait(trait_ref) => visitor.visit_poly_trait_ref(trait_ref),
1064        GenericBound::Outlives(lifetime) => visitor.visit_lifetime(lifetime, LifetimeCtxt::Bound),
1065        GenericBound::Use(args, _span) => {
1066            walk_list!(visitor, visit_precise_capturing_arg, args);
1067            V::Result::output()
1068        }
1069    }
1070}
1071
1072pub fn walk_precise_capturing_arg<'a, V: Visitor<'a>>(
1073    visitor: &mut V,
1074    arg: &'a PreciseCapturingArg,
1075) -> V::Result {
1076    match arg {
1077        PreciseCapturingArg::Lifetime(lt) => visitor.visit_lifetime(lt, LifetimeCtxt::GenericArg),
1078        PreciseCapturingArg::Arg(path, id) => visitor.visit_path(path, *id),
1079    }
1080}
1081
1082pub fn walk_generic_param<'a, V: Visitor<'a>>(
1083    visitor: &mut V,
1084    param: &'a GenericParam,
1085) -> V::Result {
1086    let GenericParam { id: _, ident, attrs, bounds, is_placeholder: _, kind, colon_span: _ } =
1087        param;
1088    walk_list!(visitor, visit_attribute, attrs);
1089    try_visit!(visitor.visit_ident(ident));
1090    walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound);
1091    match kind {
1092        GenericParamKind::Lifetime => (),
1093        GenericParamKind::Type { default } => visit_opt!(visitor, visit_ty, default),
1094        GenericParamKind::Const { ty, default, kw_span: _ } => {
1095            try_visit!(visitor.visit_ty(ty));
1096            visit_opt!(visitor, visit_anon_const, default);
1097        }
1098    }
1099    V::Result::output()
1100}
1101
1102pub fn walk_generics<'a, V: Visitor<'a>>(visitor: &mut V, generics: &'a Generics) -> V::Result {
1103    let Generics { params, where_clause, span: _ } = generics;
1104    let WhereClause { has_where_token: _, predicates, span: _ } = where_clause;
1105    walk_list!(visitor, visit_generic_param, params);
1106    walk_list!(visitor, visit_where_predicate, predicates);
1107    V::Result::output()
1108}
1109
1110pub fn walk_closure_binder<'a, V: Visitor<'a>>(
1111    visitor: &mut V,
1112    binder: &'a ClosureBinder,
1113) -> V::Result {
1114    match binder {
1115        ClosureBinder::NotPresent => {}
1116        ClosureBinder::For { generic_params, span: _ } => {
1117            walk_list!(visitor, visit_generic_param, generic_params)
1118        }
1119    }
1120    V::Result::output()
1121}
1122
1123pub fn walk_contract<'a, V: Visitor<'a>>(visitor: &mut V, c: &'a FnContract) -> V::Result {
1124    let FnContract { requires, ensures } = c;
1125    if let Some(pred) = requires {
1126        visitor.visit_expr(pred);
1127    }
1128    if let Some(pred) = ensures {
1129        visitor.visit_expr(pred);
1130    }
1131    V::Result::output()
1132}
1133
1134pub fn walk_where_predicate<'a, V: Visitor<'a>>(
1135    visitor: &mut V,
1136    predicate: &'a WherePredicate,
1137) -> V::Result {
1138    let WherePredicate { attrs, kind, id: _, span: _, is_placeholder: _ } = predicate;
1139    walk_list!(visitor, visit_attribute, attrs);
1140    visitor.visit_where_predicate_kind(kind)
1141}
1142
1143pub fn walk_where_predicate_kind<'a, V: Visitor<'a>>(
1144    visitor: &mut V,
1145    kind: &'a WherePredicateKind,
1146) -> V::Result {
1147    match kind {
1148        WherePredicateKind::BoundPredicate(WhereBoundPredicate {
1149            bounded_ty,
1150            bounds,
1151            bound_generic_params,
1152        }) => {
1153            walk_list!(visitor, visit_generic_param, bound_generic_params);
1154            try_visit!(visitor.visit_ty(bounded_ty));
1155            walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound);
1156        }
1157        WherePredicateKind::RegionPredicate(WhereRegionPredicate { lifetime, bounds }) => {
1158            try_visit!(visitor.visit_lifetime(lifetime, LifetimeCtxt::Bound));
1159            walk_list!(visitor, visit_param_bound, bounds, BoundKind::Bound);
1160        }
1161        WherePredicateKind::EqPredicate(WhereEqPredicate { lhs_ty, rhs_ty }) => {
1162            try_visit!(visitor.visit_ty(lhs_ty));
1163            try_visit!(visitor.visit_ty(rhs_ty));
1164        }
1165    }
1166    V::Result::output()
1167}
1168
1169pub fn walk_fn_ret_ty<'a, V: Visitor<'a>>(visitor: &mut V, ret_ty: &'a FnRetTy) -> V::Result {
1170    match ret_ty {
1171        FnRetTy::Default(_span) => {}
1172        FnRetTy::Ty(output_ty) => try_visit!(visitor.visit_ty(output_ty)),
1173    }
1174    V::Result::output()
1175}
1176
1177pub fn walk_fn_decl<'a, V: Visitor<'a>>(
1178    visitor: &mut V,
1179    FnDecl { inputs, output }: &'a FnDecl,
1180) -> V::Result {
1181    walk_list!(visitor, visit_param, inputs);
1182    visitor.visit_fn_ret_ty(output)
1183}
1184
1185pub fn walk_fn<'a, V: Visitor<'a>>(visitor: &mut V, kind: FnKind<'a>) -> V::Result {
1186    match kind {
1187        FnKind::Fn(
1188            _ctxt,
1189            _vis,
1190            Fn {
1191                defaultness: _,
1192                ident,
1193                sig: FnSig { header, decl, span: _ },
1194                generics,
1195                contract,
1196                body,
1197                define_opaque,
1198            },
1199        ) => {
1200            // Visibility is visited as a part of the item.
1201            try_visit!(visitor.visit_ident(ident));
1202            try_visit!(visitor.visit_fn_header(header));
1203            try_visit!(visitor.visit_generics(generics));
1204            try_visit!(visitor.visit_fn_decl(decl));
1205            visit_opt!(visitor, visit_contract, contract);
1206            visit_opt!(visitor, visit_block, body);
1207            try_visit!(walk_define_opaques(visitor, define_opaque));
1208        }
1209        FnKind::Closure(binder, coroutine_kind, decl, body) => {
1210            try_visit!(visitor.visit_closure_binder(binder));
1211            visit_opt!(visitor, visit_coroutine_kind, coroutine_kind.as_ref());
1212            try_visit!(visitor.visit_fn_decl(decl));
1213            try_visit!(visitor.visit_expr(body));
1214        }
1215    }
1216    V::Result::output()
1217}
1218
1219pub fn walk_struct_def<'a, V: Visitor<'a>>(
1220    visitor: &mut V,
1221    struct_definition: &'a VariantData,
1222) -> V::Result {
1223    walk_list!(visitor, visit_field_def, struct_definition.fields());
1224    V::Result::output()
1225}
1226
1227pub fn walk_field_def<'a, V: Visitor<'a>>(visitor: &mut V, field: &'a FieldDef) -> V::Result {
1228    let FieldDef { attrs, id: _, span: _, vis, ident, ty, is_placeholder: _, safety: _, default } =
1229        field;
1230    walk_list!(visitor, visit_attribute, attrs);
1231    try_visit!(visitor.visit_vis(vis));
1232    visit_opt!(visitor, visit_ident, ident);
1233    try_visit!(visitor.visit_ty(ty));
1234    visit_opt!(visitor, visit_anon_const, &*default);
1235    V::Result::output()
1236}
1237
1238pub fn walk_block<'a, V: Visitor<'a>>(visitor: &mut V, block: &'a Block) -> V::Result {
1239    let Block { stmts, id: _, rules: _, span: _, tokens: _ } = block;
1240    walk_list!(visitor, visit_stmt, stmts);
1241    V::Result::output()
1242}
1243
1244pub fn walk_stmt<'a, V: Visitor<'a>>(visitor: &mut V, statement: &'a Stmt) -> V::Result {
1245    let Stmt { id: _, kind, span: _ } = statement;
1246    match kind {
1247        StmtKind::Let(local) => try_visit!(visitor.visit_local(local)),
1248        StmtKind::Item(item) => try_visit!(visitor.visit_item(item)),
1249        StmtKind::Expr(expr) | StmtKind::Semi(expr) => try_visit!(visitor.visit_expr(expr)),
1250        StmtKind::Empty => {}
1251        StmtKind::MacCall(mac) => {
1252            let MacCallStmt { mac, attrs, style: _, tokens: _ } = &**mac;
1253            walk_list!(visitor, visit_attribute, attrs);
1254            try_visit!(visitor.visit_mac_call(mac));
1255        }
1256    }
1257    V::Result::output()
1258}
1259
1260pub fn walk_mac<'a, V: Visitor<'a>>(visitor: &mut V, mac: &'a MacCall) -> V::Result {
1261    let MacCall { path, args: _ } = mac;
1262    visitor.visit_path(path, DUMMY_NODE_ID)
1263}
1264
1265pub fn walk_anon_const<'a, V: Visitor<'a>>(visitor: &mut V, constant: &'a AnonConst) -> V::Result {
1266    let AnonConst { id: _, value } = constant;
1267    visitor.visit_expr(value)
1268}
1269
1270pub fn walk_inline_asm<'a, V: Visitor<'a>>(visitor: &mut V, asm: &'a InlineAsm) -> V::Result {
1271    let InlineAsm {
1272        asm_macro: _,
1273        template: _,
1274        template_strs: _,
1275        operands,
1276        clobber_abis: _,
1277        options: _,
1278        line_spans: _,
1279    } = asm;
1280    for (op, _span) in operands {
1281        match op {
1282            InlineAsmOperand::In { expr, reg: _ }
1283            | InlineAsmOperand::Out { expr: Some(expr), reg: _, late: _ }
1284            | InlineAsmOperand::InOut { expr, reg: _, late: _ } => {
1285                try_visit!(visitor.visit_expr(expr))
1286            }
1287            InlineAsmOperand::Out { expr: None, reg: _, late: _ } => {}
1288            InlineAsmOperand::SplitInOut { in_expr, out_expr, reg: _, late: _ } => {
1289                try_visit!(visitor.visit_expr(in_expr));
1290                visit_opt!(visitor, visit_expr, out_expr);
1291            }
1292            InlineAsmOperand::Const { anon_const } => {
1293                try_visit!(visitor.visit_anon_const(anon_const))
1294            }
1295            InlineAsmOperand::Sym { sym } => try_visit!(visitor.visit_inline_asm_sym(sym)),
1296            InlineAsmOperand::Label { block } => try_visit!(visitor.visit_block(block)),
1297        }
1298    }
1299    V::Result::output()
1300}
1301
1302pub fn walk_inline_asm_sym<'a, V: Visitor<'a>>(
1303    visitor: &mut V,
1304    InlineAsmSym { id, qself, path }: &'a InlineAsmSym,
1305) -> V::Result {
1306    try_visit!(visitor.visit_qself(qself));
1307    visitor.visit_path(path, *id)
1308}
1309
1310pub fn walk_format_args<'a, V: Visitor<'a>>(visitor: &mut V, fmt: &'a FormatArgs) -> V::Result {
1311    let FormatArgs { span: _, template: _, arguments, uncooked_fmt_str: _ } = fmt;
1312    for FormatArgument { kind, expr } in arguments.all_args() {
1313        match kind {
1314            FormatArgumentKind::Named(ident) | FormatArgumentKind::Captured(ident) => {
1315                try_visit!(visitor.visit_ident(ident))
1316            }
1317            FormatArgumentKind::Normal => {}
1318        }
1319        try_visit!(visitor.visit_expr(expr));
1320    }
1321    V::Result::output()
1322}
1323
1324pub fn walk_expr<'a, V: Visitor<'a>>(visitor: &mut V, expression: &'a Expr) -> V::Result {
1325    let Expr { id, kind, span, attrs, tokens: _ } = expression;
1326    walk_list!(visitor, visit_attribute, attrs);
1327    match kind {
1328        ExprKind::Array(subexpressions) => {
1329            walk_list!(visitor, visit_expr, subexpressions);
1330        }
1331        ExprKind::ConstBlock(anon_const) => try_visit!(visitor.visit_anon_const(anon_const)),
1332        ExprKind::Repeat(element, count) => {
1333            try_visit!(visitor.visit_expr(element));
1334            try_visit!(visitor.visit_anon_const(count));
1335        }
1336        ExprKind::Struct(se) => {
1337            let StructExpr { qself, path, fields, rest } = &**se;
1338            try_visit!(visitor.visit_qself(qself));
1339            try_visit!(visitor.visit_path(path, *id));
1340            walk_list!(visitor, visit_expr_field, fields);
1341            match rest {
1342                StructRest::Base(expr) => try_visit!(visitor.visit_expr(expr)),
1343                StructRest::Rest(_span) => {}
1344                StructRest::None => {}
1345            }
1346        }
1347        ExprKind::Tup(subexpressions) => {
1348            walk_list!(visitor, visit_expr, subexpressions);
1349        }
1350        ExprKind::Call(callee_expression, arguments) => {
1351            try_visit!(visitor.visit_expr(callee_expression));
1352            walk_list!(visitor, visit_expr, arguments);
1353        }
1354        ExprKind::MethodCall(box MethodCall { seg, receiver, args, span: _ }) => {
1355            try_visit!(visitor.visit_expr(receiver));
1356            try_visit!(visitor.visit_path_segment(seg));
1357            walk_list!(visitor, visit_expr, args);
1358        }
1359        ExprKind::Binary(_op, left_expression, right_expression) => {
1360            try_visit!(visitor.visit_expr(left_expression));
1361            try_visit!(visitor.visit_expr(right_expression));
1362        }
1363        ExprKind::AddrOf(_kind, _mutbl, subexpression) => {
1364            try_visit!(visitor.visit_expr(subexpression));
1365        }
1366        ExprKind::Unary(_op, subexpression) => {
1367            try_visit!(visitor.visit_expr(subexpression));
1368        }
1369        ExprKind::Cast(subexpression, typ) | ExprKind::Type(subexpression, typ) => {
1370            try_visit!(visitor.visit_expr(subexpression));
1371            try_visit!(visitor.visit_ty(typ));
1372        }
1373        ExprKind::Let(pat, expr, _span, _recovered) => {
1374            try_visit!(visitor.visit_pat(pat));
1375            try_visit!(visitor.visit_expr(expr));
1376        }
1377        ExprKind::If(head_expression, if_block, optional_else) => {
1378            try_visit!(visitor.visit_expr(head_expression));
1379            try_visit!(visitor.visit_block(if_block));
1380            visit_opt!(visitor, visit_expr, optional_else);
1381        }
1382        ExprKind::While(subexpression, block, opt_label) => {
1383            visit_opt!(visitor, visit_label, opt_label);
1384            try_visit!(visitor.visit_expr(subexpression));
1385            try_visit!(visitor.visit_block(block));
1386        }
1387        ExprKind::ForLoop { pat, iter, body, label, kind: _ } => {
1388            visit_opt!(visitor, visit_label, label);
1389            try_visit!(visitor.visit_pat(pat));
1390            try_visit!(visitor.visit_expr(iter));
1391            try_visit!(visitor.visit_block(body));
1392        }
1393        ExprKind::Loop(block, opt_label, _span) => {
1394            visit_opt!(visitor, visit_label, opt_label);
1395            try_visit!(visitor.visit_block(block));
1396        }
1397        ExprKind::Match(subexpression, arms, _kind) => {
1398            try_visit!(visitor.visit_expr(subexpression));
1399            walk_list!(visitor, visit_arm, arms);
1400        }
1401        ExprKind::Closure(box Closure {
1402            binder,
1403            capture_clause,
1404            coroutine_kind,
1405            constness: _,
1406            movability: _,
1407            fn_decl,
1408            body,
1409            fn_decl_span: _,
1410            fn_arg_span: _,
1411        }) => {
1412            try_visit!(visitor.visit_capture_by(capture_clause));
1413            try_visit!(visitor.visit_fn(
1414                FnKind::Closure(binder, coroutine_kind, fn_decl, body),
1415                *span,
1416                *id
1417            ));
1418        }
1419        ExprKind::Block(block, opt_label) => {
1420            visit_opt!(visitor, visit_label, opt_label);
1421            try_visit!(visitor.visit_block(block));
1422        }
1423        ExprKind::Gen(_capt, body, _kind, _decl_span) => try_visit!(visitor.visit_block(body)),
1424        ExprKind::Await(expr, _span) => try_visit!(visitor.visit_expr(expr)),
1425        ExprKind::Use(expr, _span) => try_visit!(visitor.visit_expr(expr)),
1426        ExprKind::Assign(lhs, rhs, _span) => {
1427            try_visit!(visitor.visit_expr(lhs));
1428            try_visit!(visitor.visit_expr(rhs));
1429        }
1430        ExprKind::AssignOp(_op, left_expression, right_expression) => {
1431            try_visit!(visitor.visit_expr(left_expression));
1432            try_visit!(visitor.visit_expr(right_expression));
1433        }
1434        ExprKind::Field(subexpression, ident) => {
1435            try_visit!(visitor.visit_expr(subexpression));
1436            try_visit!(visitor.visit_ident(ident));
1437        }
1438        ExprKind::Index(main_expression, index_expression, _span) => {
1439            try_visit!(visitor.visit_expr(main_expression));
1440            try_visit!(visitor.visit_expr(index_expression));
1441        }
1442        ExprKind::Range(start, end, _limit) => {
1443            visit_opt!(visitor, visit_expr, start);
1444            visit_opt!(visitor, visit_expr, end);
1445        }
1446        ExprKind::Underscore => {}
1447        ExprKind::Path(maybe_qself, path) => {
1448            try_visit!(visitor.visit_qself(maybe_qself));
1449            try_visit!(visitor.visit_path(path, *id));
1450        }
1451        ExprKind::Break(opt_label, opt_expr) => {
1452            visit_opt!(visitor, visit_label, opt_label);
1453            visit_opt!(visitor, visit_expr, opt_expr);
1454        }
1455        ExprKind::Continue(opt_label) => {
1456            visit_opt!(visitor, visit_label, opt_label);
1457        }
1458        ExprKind::Ret(optional_expression) => {
1459            visit_opt!(visitor, visit_expr, optional_expression);
1460        }
1461        ExprKind::Yeet(optional_expression) => {
1462            visit_opt!(visitor, visit_expr, optional_expression);
1463        }
1464        ExprKind::Become(expr) => try_visit!(visitor.visit_expr(expr)),
1465        ExprKind::MacCall(mac) => try_visit!(visitor.visit_mac_call(mac)),
1466        ExprKind::Paren(subexpression) => try_visit!(visitor.visit_expr(subexpression)),
1467        ExprKind::InlineAsm(asm) => try_visit!(visitor.visit_inline_asm(asm)),
1468        ExprKind::FormatArgs(f) => try_visit!(visitor.visit_format_args(f)),
1469        ExprKind::OffsetOf(container, fields) => {
1470            try_visit!(visitor.visit_ty(container));
1471            walk_list!(visitor, visit_ident, fields.iter());
1472        }
1473        ExprKind::Yield(kind) => {
1474            visit_opt!(visitor, visit_expr, kind.expr());
1475        }
1476        ExprKind::Try(subexpression) => try_visit!(visitor.visit_expr(subexpression)),
1477        ExprKind::TryBlock(body) => try_visit!(visitor.visit_block(body)),
1478        ExprKind::Lit(_token) => {}
1479        ExprKind::IncludedBytes(_bytes) => {}
1480        ExprKind::UnsafeBinderCast(_kind, expr, ty) => {
1481            try_visit!(visitor.visit_expr(expr));
1482            visit_opt!(visitor, visit_ty, ty);
1483        }
1484        ExprKind::Err(_guar) => {}
1485        ExprKind::Dummy => {}
1486    }
1487
1488    V::Result::output()
1489}
1490
1491pub fn walk_param<'a, V: Visitor<'a>>(visitor: &mut V, param: &'a Param) -> V::Result {
1492    let Param { attrs, ty, pat, id: _, span: _, is_placeholder: _ } = param;
1493    walk_list!(visitor, visit_attribute, attrs);
1494    try_visit!(visitor.visit_pat(pat));
1495    try_visit!(visitor.visit_ty(ty));
1496    V::Result::output()
1497}
1498
1499pub fn walk_arm<'a, V: Visitor<'a>>(visitor: &mut V, arm: &'a Arm) -> V::Result {
1500    let Arm { attrs, pat, guard, body, span: _, id: _, is_placeholder: _ } = arm;
1501    walk_list!(visitor, visit_attribute, attrs);
1502    try_visit!(visitor.visit_pat(pat));
1503    visit_opt!(visitor, visit_expr, guard);
1504    visit_opt!(visitor, visit_expr, body);
1505    V::Result::output()
1506}
1507
1508pub fn walk_vis<'a, V: Visitor<'a>>(visitor: &mut V, vis: &'a Visibility) -> V::Result {
1509    let Visibility { kind, span: _, tokens: _ } = vis;
1510    match kind {
1511        VisibilityKind::Restricted { path, id, shorthand: _ } => {
1512            try_visit!(visitor.visit_path(path, *id));
1513        }
1514        VisibilityKind::Public | VisibilityKind::Inherited => {}
1515    }
1516    V::Result::output()
1517}
1518
1519pub fn walk_attribute<'a, V: Visitor<'a>>(visitor: &mut V, attr: &'a Attribute) -> V::Result {
1520    let Attribute { kind, id: _, style: _, span: _ } = attr;
1521    match kind {
1522        AttrKind::Normal(normal) => {
1523            let NormalAttr { item, tokens: _ } = &**normal;
1524            let AttrItem { unsafety: _, path, args, tokens: _ } = item;
1525            try_visit!(visitor.visit_path(path, DUMMY_NODE_ID));
1526            try_visit!(walk_attr_args(visitor, args));
1527        }
1528        AttrKind::DocComment(_kind, _sym) => {}
1529    }
1530    V::Result::output()
1531}
1532
1533pub fn walk_attr_args<'a, V: Visitor<'a>>(visitor: &mut V, args: &'a AttrArgs) -> V::Result {
1534    match args {
1535        AttrArgs::Empty => {}
1536        AttrArgs::Delimited(_args) => {}
1537        AttrArgs::Eq { expr, .. } => try_visit!(visitor.visit_expr(expr)),
1538    }
1539    V::Result::output()
1540}