1 //! This module contains the "cleaned" pieces of the AST, and the functions
8 mod render_macro_matchers;
14 use rustc_attr as attr;
15 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
17 use rustc_hir::def::{CtorKind, DefKind, Res};
18 use rustc_hir::def_id::{DefId, LOCAL_CRATE};
19 use rustc_hir::PredicateOrigin;
20 use rustc_infer::infer::region_constraints::{Constraint, RegionConstraintData};
21 use rustc_middle::middle::resolve_lifetime as rl;
22 use rustc_middle::ty::fold::TypeFolder;
23 use rustc_middle::ty::subst::{InternalSubsts, Subst};
24 use rustc_middle::ty::{self, AdtKind, DefIdTree, EarlyBinder, Lift, Ty, TyCtxt};
25 use rustc_middle::{bug, span_bug};
26 use rustc_span::hygiene::{AstPass, MacroKind};
27 use rustc_span::symbol::{kw, sym, Ident, Symbol};
28 use rustc_span::{self, ExpnKind};
29 use rustc_typeck::hir_ty_to_ty;
31 use std::assert_matches::assert_matches;
32 use std::collections::hash_map::Entry;
33 use std::collections::BTreeMap;
34 use std::default::Default;
38 use crate::core::{self, DocContext, ImplTraitParam};
39 use crate::formats::item_type::ItemType;
40 use crate::visit_ast::Module as DocModule;
44 pub(crate) use self::types::*;
45 pub(crate) use self::utils::{get_auto_trait_and_blanket_impls, krate, register_res};
47 pub(crate) trait Clean<'tcx, T> {
48 fn clean(&self, cx: &mut DocContext<'tcx>) -> T;
51 impl<'tcx> Clean<'tcx, Item> for DocModule<'tcx> {
52 fn clean(&self, cx: &mut DocContext<'tcx>) -> Item {
53 let mut items: Vec<Item> = vec![];
57 .map(|(item, renamed)| clean_maybe_renamed_foreign_item(cx, item, *renamed)),
59 items.extend(self.mods.iter().map(|x| x.clean(cx)));
63 .flat_map(|(item, renamed)| clean_maybe_renamed_item(cx, item, *renamed)),
66 // determine if we should display the inner contents or
67 // the outer `mod` item for the source code.
69 let span = Span::new({
70 let where_outer = self.where_outer(cx.tcx);
71 let sm = cx.sess().source_map();
72 let outer = sm.lookup_char_pos(where_outer.lo());
73 let inner = sm.lookup_char_pos(self.where_inner.lo());
74 if outer.file.start_pos == inner.file.start_pos {
78 // mod foo; (and a separate SourceFile for the contents)
83 Item::from_hir_id_and_parts(
86 ModuleItem(Module { items, span }),
92 impl<'tcx> Clean<'tcx, Attributes> for [ast::Attribute] {
93 fn clean(&self, _cx: &mut DocContext<'_>) -> Attributes {
94 Attributes::from_ast(self, None)
98 impl<'tcx> Clean<'tcx, Option<GenericBound>> for hir::GenericBound<'tcx> {
99 fn clean(&self, cx: &mut DocContext<'tcx>) -> Option<GenericBound> {
101 hir::GenericBound::Outlives(lt) => GenericBound::Outlives(lt.clean(cx)),
102 hir::GenericBound::LangItemTrait(lang_item, span, _, generic_args) => {
103 let def_id = cx.tcx.require_lang_item(lang_item, Some(span));
105 let trait_ref = ty::TraitRef::identity(cx.tcx, def_id).skip_binder();
107 let generic_args = generic_args.clean(cx);
108 let GenericArgs::AngleBracketed { bindings, .. } = generic_args
110 bug!("clean: parenthesized `GenericBound::LangItemTrait`");
113 let trait_ = clean_trait_ref_with_bindings(cx, trait_ref, &bindings);
114 GenericBound::TraitBound(
115 PolyTrait { trait_, generic_params: vec![] },
116 hir::TraitBoundModifier::None,
119 hir::GenericBound::Trait(ref t, modifier) => {
120 // `T: ~const Destruct` is hidden because `T: Destruct` is a no-op.
121 if modifier == hir::TraitBoundModifier::MaybeConst
122 && cx.tcx.lang_items().destruct_trait()
123 == Some(t.trait_ref.trait_def_id().unwrap())
128 GenericBound::TraitBound(t.clean(cx), modifier)
134 fn clean_trait_ref_with_bindings<'tcx>(
135 cx: &mut DocContext<'tcx>,
136 trait_ref: ty::TraitRef<'tcx>,
137 bindings: &[TypeBinding],
139 let kind = cx.tcx.def_kind(trait_ref.def_id).into();
140 if !matches!(kind, ItemType::Trait | ItemType::TraitAlias) {
141 span_bug!(cx.tcx.def_span(trait_ref.def_id), "`TraitRef` had unexpected kind {:?}", kind);
143 inline::record_extern_fqn(cx, trait_ref.def_id, kind);
144 let path = external_path(cx, trait_ref.def_id, true, bindings.to_vec(), trait_ref.substs);
146 debug!("ty::TraitRef\n subst: {:?}\n", trait_ref.substs);
151 impl<'tcx> Clean<'tcx, Path> for ty::TraitRef<'tcx> {
152 fn clean(&self, cx: &mut DocContext<'tcx>) -> Path {
153 clean_trait_ref_with_bindings(cx, *self, &[])
157 fn clean_poly_trait_ref_with_bindings<'tcx>(
158 cx: &mut DocContext<'tcx>,
159 poly_trait_ref: ty::PolyTraitRef<'tcx>,
160 bindings: &[TypeBinding],
162 let poly_trait_ref = poly_trait_ref.lift_to_tcx(cx.tcx).unwrap();
164 // collect any late bound regions
165 let late_bound_regions: Vec<_> = cx
167 .collect_referenced_late_bound_regions(&poly_trait_ref)
169 .filter_map(|br| match br {
170 ty::BrNamed(_, name) if name != kw::UnderscoreLifetime => Some(GenericParamDef {
172 kind: GenericParamDefKind::Lifetime { outlives: vec![] },
178 let trait_ = clean_trait_ref_with_bindings(cx, poly_trait_ref.skip_binder(), bindings);
179 GenericBound::TraitBound(
180 PolyTrait { trait_, generic_params: late_bound_regions },
181 hir::TraitBoundModifier::None,
185 impl<'tcx> Clean<'tcx, GenericBound> for ty::PolyTraitRef<'tcx> {
186 fn clean(&self, cx: &mut DocContext<'tcx>) -> GenericBound {
187 clean_poly_trait_ref_with_bindings(cx, *self, &[])
191 impl<'tcx> Clean<'tcx, Lifetime> for hir::Lifetime {
192 fn clean(&self, cx: &mut DocContext<'tcx>) -> Lifetime {
193 let def = cx.tcx.named_region(self.hir_id);
195 rl::Region::EarlyBound(_, node_id)
196 | rl::Region::LateBound(_, _, node_id)
197 | rl::Region::Free(_, node_id),
200 if let Some(lt) = cx.substs.get(&node_id).and_then(|p| p.as_lt()).cloned() {
204 Lifetime(self.name.ident().name)
208 impl<'tcx> Clean<'tcx, Constant> for hir::ConstArg {
209 fn clean(&self, cx: &mut DocContext<'tcx>) -> Constant {
213 .type_of(cx.tcx.hir().body_owner_def_id(self.value.body).to_def_id())
215 kind: ConstantKind::Anonymous { body: self.value.body },
220 impl<'tcx> Clean<'tcx, Option<Lifetime>> for ty::Region<'tcx> {
221 fn clean(&self, _cx: &mut DocContext<'_>) -> Option<Lifetime> {
223 ty::ReStatic => Some(Lifetime::statik()),
224 ty::ReLateBound(_, ty::BoundRegion { kind: ty::BrNamed(_, name), .. }) => {
225 if name != kw::UnderscoreLifetime { Some(Lifetime(name)) } else { None }
227 ty::ReEarlyBound(ref data) => {
228 if data.name != kw::UnderscoreLifetime {
229 Some(Lifetime(data.name))
237 | ty::RePlaceholder(..)
240 debug!("cannot clean region {:?}", self);
247 impl<'tcx> Clean<'tcx, Option<WherePredicate>> for hir::WherePredicate<'tcx> {
248 fn clean(&self, cx: &mut DocContext<'tcx>) -> Option<WherePredicate> {
249 if !self.in_where_clause() {
253 hir::WherePredicate::BoundPredicate(ref wbp) => {
254 let bound_params = wbp
255 .bound_generic_params
258 // Higher-ranked params must be lifetimes.
259 // Higher-ranked lifetimes can't have bounds.
262 hir::GenericParam { kind: hir::GenericParamKind::Lifetime { .. }, .. }
264 Lifetime(param.name.ident().name)
267 WherePredicate::BoundPredicate {
268 ty: wbp.bounded_ty.clean(cx),
269 bounds: wbp.bounds.iter().filter_map(|x| x.clean(cx)).collect(),
274 hir::WherePredicate::RegionPredicate(ref wrp) => WherePredicate::RegionPredicate {
275 lifetime: wrp.lifetime.clean(cx),
276 bounds: wrp.bounds.iter().filter_map(|x| x.clean(cx)).collect(),
279 hir::WherePredicate::EqPredicate(ref wrp) => WherePredicate::EqPredicate {
280 lhs: wrp.lhs_ty.clean(cx),
281 rhs: wrp.rhs_ty.clean(cx).into(),
287 impl<'tcx> Clean<'tcx, Option<WherePredicate>> for ty::Predicate<'tcx> {
288 fn clean(&self, cx: &mut DocContext<'tcx>) -> Option<WherePredicate> {
289 let bound_predicate = self.kind();
290 match bound_predicate.skip_binder() {
291 ty::PredicateKind::Trait(pred) => bound_predicate.rebind(pred).clean(cx),
292 ty::PredicateKind::RegionOutlives(pred) => pred.clean(cx),
293 ty::PredicateKind::TypeOutlives(pred) => pred.clean(cx),
294 ty::PredicateKind::Projection(pred) => Some(pred.clean(cx)),
295 ty::PredicateKind::ConstEvaluatable(..) => None,
296 ty::PredicateKind::WellFormed(..) => None,
298 ty::PredicateKind::Subtype(..)
299 | ty::PredicateKind::Coerce(..)
300 | ty::PredicateKind::ObjectSafe(..)
301 | ty::PredicateKind::ClosureKind(..)
302 | ty::PredicateKind::ConstEquate(..)
303 | ty::PredicateKind::TypeWellFormedFromEnv(..) => panic!("not user writable"),
308 impl<'tcx> Clean<'tcx, Option<WherePredicate>> for ty::PolyTraitPredicate<'tcx> {
309 fn clean(&self, cx: &mut DocContext<'tcx>) -> Option<WherePredicate> {
310 // `T: ~const Destruct` is hidden because `T: Destruct` is a no-op.
311 if self.skip_binder().constness == ty::BoundConstness::ConstIfConst
312 && Some(self.skip_binder().def_id()) == cx.tcx.lang_items().destruct_trait()
317 let poly_trait_ref = self.map_bound(|pred| pred.trait_ref);
318 Some(WherePredicate::BoundPredicate {
319 ty: poly_trait_ref.skip_binder().self_ty().clean(cx),
320 bounds: vec![poly_trait_ref.clean(cx)],
321 bound_params: Vec::new(),
326 impl<'tcx> Clean<'tcx, Option<WherePredicate>>
327 for ty::OutlivesPredicate<ty::Region<'tcx>, ty::Region<'tcx>>
329 fn clean(&self, cx: &mut DocContext<'tcx>) -> Option<WherePredicate> {
330 let ty::OutlivesPredicate(a, b) = self;
332 if a.is_empty() && b.is_empty() {
336 Some(WherePredicate::RegionPredicate {
337 lifetime: a.clean(cx).expect("failed to clean lifetime"),
338 bounds: vec![GenericBound::Outlives(b.clean(cx).expect("failed to clean bounds"))],
343 impl<'tcx> Clean<'tcx, Option<WherePredicate>>
344 for ty::OutlivesPredicate<Ty<'tcx>, ty::Region<'tcx>>
346 fn clean(&self, cx: &mut DocContext<'tcx>) -> Option<WherePredicate> {
347 let ty::OutlivesPredicate(ty, lt) = self;
353 Some(WherePredicate::BoundPredicate {
355 bounds: vec![GenericBound::Outlives(lt.clean(cx).expect("failed to clean lifetimes"))],
356 bound_params: Vec::new(),
361 impl<'tcx> Clean<'tcx, Term> for ty::Term<'tcx> {
362 fn clean(&self, cx: &mut DocContext<'tcx>) -> Term {
364 ty::Term::Ty(ty) => Term::Type(ty.clean(cx)),
365 ty::Term::Const(c) => Term::Constant(c.clean(cx)),
370 impl<'tcx> Clean<'tcx, Term> for hir::Term<'tcx> {
371 fn clean(&self, cx: &mut DocContext<'tcx>) -> Term {
373 hir::Term::Ty(ty) => Term::Type(ty.clean(cx)),
374 hir::Term::Const(c) => {
375 let def_id = cx.tcx.hir().local_def_id(c.hir_id);
376 Term::Constant(ty::Const::from_anon_const(cx.tcx, def_id).clean(cx))
382 impl<'tcx> Clean<'tcx, WherePredicate> for ty::ProjectionPredicate<'tcx> {
383 fn clean(&self, cx: &mut DocContext<'tcx>) -> WherePredicate {
384 let ty::ProjectionPredicate { projection_ty, term } = self;
385 WherePredicate::EqPredicate { lhs: projection_ty.clean(cx), rhs: term.clean(cx) }
389 fn clean_projection<'tcx>(
390 ty: ty::ProjectionTy<'tcx>,
391 cx: &mut DocContext<'tcx>,
392 def_id: Option<DefId>,
394 let lifted = ty.lift_to_tcx(cx.tcx).unwrap();
395 let trait_ = lifted.trait_ref(cx.tcx).clean(cx);
396 let self_type = ty.self_ty().clean(cx);
397 let self_def_id = if let Some(def_id) = def_id {
398 cx.tcx.opt_parent(def_id).or(Some(def_id))
400 self_type.def_id(&cx.cache)
402 let should_show_cast = compute_should_show_cast(self_def_id, &trait_, &self_type);
404 assoc: Box::new(projection_to_path_segment(ty, cx)),
406 self_type: box self_type,
411 impl<'tcx> Clean<'tcx, Type> for ty::ProjectionTy<'tcx> {
412 fn clean(&self, cx: &mut DocContext<'tcx>) -> Type {
413 clean_projection(*self, cx, None)
417 fn compute_should_show_cast(self_def_id: Option<DefId>, trait_: &Path, self_type: &Type) -> bool {
418 !trait_.segments.is_empty()
420 .zip(Some(trait_.def_id()))
421 .map_or(!self_type.is_self_type(), |(id, trait_)| id != trait_)
424 fn projection_to_path_segment<'tcx>(
425 ty: ty::ProjectionTy<'tcx>,
426 cx: &mut DocContext<'tcx>,
428 let item = cx.tcx.associated_item(ty.item_def_id);
429 let generics = cx.tcx.generics_of(ty.item_def_id);
432 args: GenericArgs::AngleBracketed {
433 args: substs_to_args(cx, &ty.substs[generics.parent_count..], false).into(),
434 bindings: Default::default(),
439 impl<'tcx> Clean<'tcx, GenericParamDef> for ty::GenericParamDef {
440 fn clean(&self, cx: &mut DocContext<'tcx>) -> GenericParamDef {
441 let (name, kind) = match self.kind {
442 ty::GenericParamDefKind::Lifetime => {
443 (self.name, GenericParamDefKind::Lifetime { outlives: vec![] })
445 ty::GenericParamDefKind::Type { has_default, synthetic, .. } => {
446 let default = if has_default {
447 Some(clean_ty(cx.tcx.type_of(self.def_id), cx, Some(self.def_id)))
453 GenericParamDefKind::Type {
455 bounds: vec![], // These are filled in from the where-clauses.
456 default: default.map(Box::new),
461 ty::GenericParamDefKind::Const { has_default } => (
463 GenericParamDefKind::Const {
465 ty: Box::new(cx.tcx.type_of(self.def_id).clean(cx)),
466 default: match has_default {
467 true => Some(Box::new(cx.tcx.const_param_default(self.def_id).to_string())),
474 GenericParamDef { name, kind }
478 fn clean_generic_param<'tcx>(
479 cx: &mut DocContext<'tcx>,
480 generics: Option<&hir::Generics<'tcx>>,
481 param: &hir::GenericParam<'tcx>,
482 ) -> GenericParamDef {
483 let did = cx.tcx.hir().local_def_id(param.hir_id);
484 let (name, kind) = match param.kind {
485 hir::GenericParamKind::Lifetime { .. } => {
486 let outlives = if let Some(generics) = generics {
488 .outlives_for_param(did)
489 .filter(|bp| !bp.in_where_clause)
490 .flat_map(|bp| bp.bounds)
491 .map(|bound| match bound {
492 hir::GenericBound::Outlives(lt) => lt.clean(cx),
499 (param.name.ident().name, GenericParamDefKind::Lifetime { outlives })
501 hir::GenericParamKind::Type { ref default, synthetic } => {
502 let bounds = if let Some(generics) = generics {
504 .bounds_for_param(did)
505 .filter(|bp| bp.origin != PredicateOrigin::WhereClause)
506 .flat_map(|bp| bp.bounds)
507 .filter_map(|x| x.clean(cx))
513 param.name.ident().name,
514 GenericParamDefKind::Type {
515 did: did.to_def_id(),
517 default: default.map(|t| t.clean(cx)).map(Box::new),
522 hir::GenericParamKind::Const { ty, default } => (
523 param.name.ident().name,
524 GenericParamDefKind::Const {
525 did: did.to_def_id(),
526 ty: Box::new(ty.clean(cx)),
527 default: default.map(|ct| {
528 let def_id = cx.tcx.hir().local_def_id(ct.hir_id);
529 Box::new(ty::Const::from_anon_const(cx.tcx, def_id).to_string())
535 GenericParamDef { name, kind }
538 /// Synthetic type-parameters are inserted after normal ones.
539 /// In order for normal parameters to be able to refer to synthetic ones,
540 /// scans them first.
541 fn is_impl_trait(param: &hir::GenericParam<'_>) -> bool {
543 hir::GenericParamKind::Type { synthetic, .. } => synthetic,
548 /// This can happen for `async fn`, e.g. `async fn f<'_>(&'_ self)`.
550 /// See `lifetime_to_generic_param` in `rustc_ast_lowering` for more information.
551 fn is_elided_lifetime(param: &hir::GenericParam<'_>) -> bool {
552 matches!(param.kind, hir::GenericParamKind::Lifetime { kind: hir::LifetimeParamKind::Elided })
555 impl<'tcx> Clean<'tcx, Generics> for hir::Generics<'tcx> {
556 fn clean(&self, cx: &mut DocContext<'tcx>) -> Generics {
557 let impl_trait_params = self
560 .filter(|param| is_impl_trait(param))
562 let param = clean_generic_param(cx, Some(self), param);
564 GenericParamDefKind::Lifetime { .. } => unreachable!(),
565 GenericParamDefKind::Type { did, ref bounds, .. } => {
566 cx.impl_trait_bounds.insert(did.into(), bounds.clone());
568 GenericParamDefKind::Const { .. } => unreachable!(),
572 .collect::<Vec<_>>();
574 let mut params = Vec::with_capacity(self.params.len());
575 for p in self.params.iter().filter(|p| !is_impl_trait(p) && !is_elided_lifetime(p)) {
576 let p = clean_generic_param(cx, Some(self), p);
579 params.extend(impl_trait_params);
581 let mut generics = Generics {
583 where_predicates: self.predicates.iter().filter_map(|x| x.clean(cx)).collect(),
586 // Some duplicates are generated for ?Sized bounds between type params and where
587 // predicates. The point in here is to move the bounds definitions from type params
588 // to where predicates when such cases occur.
589 for where_pred in &mut generics.where_predicates {
591 WherePredicate::BoundPredicate {
592 ty: Generic(ref name), ref mut bounds, ..
594 if bounds.is_empty() {
595 for param in &mut generics.params {
597 GenericParamDefKind::Lifetime { .. } => {}
598 GenericParamDefKind::Type { bounds: ref mut ty_bounds, .. } => {
599 if ¶m.name == name {
600 mem::swap(bounds, ty_bounds);
604 GenericParamDefKind::Const { .. } => {}
616 fn clean_ty_generics<'tcx>(
617 cx: &mut DocContext<'tcx>,
619 preds: ty::GenericPredicates<'tcx>,
621 // Don't populate `cx.impl_trait_bounds` before `clean`ning `where` clauses,
622 // since `Clean for ty::Predicate` would consume them.
623 let mut impl_trait = BTreeMap::<ImplTraitParam, Vec<GenericBound>>::default();
625 // Bounds in the type_params and lifetimes fields are repeated in the
626 // predicates field (see rustc_typeck::collect::ty_generics), so remove
628 let stripped_params = gens
631 .filter_map(|param| match param.kind {
632 ty::GenericParamDefKind::Lifetime if param.name == kw::UnderscoreLifetime => None,
633 ty::GenericParamDefKind::Lifetime => Some(param.clean(cx)),
634 ty::GenericParamDefKind::Type { synthetic, .. } => {
635 if param.name == kw::SelfUpper {
636 assert_eq!(param.index, 0);
640 impl_trait.insert(param.index.into(), vec![]);
643 Some(param.clean(cx))
645 ty::GenericParamDefKind::Const { .. } => Some(param.clean(cx)),
647 .collect::<Vec<GenericParamDef>>();
649 // param index -> [(DefId of trait, associated type name and generics, type)]
650 let mut impl_trait_proj = FxHashMap::<u32, Vec<(DefId, PathSegment, Ty<'_>)>>::default();
652 let where_predicates = preds
656 let mut projection = None;
657 let param_idx = (|| {
658 let bound_p = p.kind();
659 match bound_p.skip_binder() {
660 ty::PredicateKind::Trait(pred) => {
661 if let ty::Param(param) = pred.self_ty().kind() {
662 return Some(param.index);
665 ty::PredicateKind::TypeOutlives(ty::OutlivesPredicate(ty, _reg)) => {
666 if let ty::Param(param) = ty.kind() {
667 return Some(param.index);
670 ty::PredicateKind::Projection(p) => {
671 if let ty::Param(param) = p.projection_ty.self_ty().kind() {
672 projection = Some(bound_p.rebind(p));
673 return Some(param.index);
682 if let Some(param_idx) = param_idx {
683 if let Some(b) = impl_trait.get_mut(¶m_idx.into()) {
684 let p: WherePredicate = p.clean(cx)?;
691 .filter(|b| !b.is_sized_bound(cx)),
694 let proj = projection
695 .map(|p| (p.skip_binder().projection_ty.clean(cx), p.skip_binder().term));
696 if let Some(((_, trait_did, name), rhs)) = proj
698 .and_then(|(lhs, rhs): &(Type, _)| Some((lhs.projection()?, rhs)))
700 // FIXME(...): Remove this unwrap()
701 impl_trait_proj.entry(param_idx).or_default().push((
714 .collect::<Vec<_>>();
716 for (param, mut bounds) in impl_trait {
717 // Move trait bounds to the front.
718 bounds.sort_by_key(|b| !matches!(b, GenericBound::TraitBound(..)));
720 if let crate::core::ImplTraitParam::ParamIndex(idx) = param {
721 if let Some(proj) = impl_trait_proj.remove(&idx) {
722 for (trait_did, name, rhs) in proj {
723 let rhs = rhs.clean(cx);
724 simplify::merge_bounds(cx, &mut bounds, trait_did, name, &Term::Type(rhs));
731 cx.impl_trait_bounds.insert(param, bounds);
734 // Now that `cx.impl_trait_bounds` is populated, we can process
735 // remaining predicates which could contain `impl Trait`.
736 let mut where_predicates =
737 where_predicates.into_iter().flat_map(|p| p.clean(cx)).collect::<Vec<_>>();
739 // Type parameters have a Sized bound by default unless removed with
740 // ?Sized. Scan through the predicates and mark any type parameter with
741 // a Sized bound, removing the bounds as we find them.
743 // Note that associated types also have a sized bound by default, but we
744 // don't actually know the set of associated types right here so that's
745 // handled in cleaning associated types
746 let mut sized_params = FxHashSet::default();
747 where_predicates.retain(|pred| match *pred {
748 WherePredicate::BoundPredicate { ty: Generic(ref g), ref bounds, .. } => {
749 if bounds.iter().any(|b| b.is_sized_bound(cx)) {
750 sized_params.insert(*g);
759 // Run through the type parameters again and insert a ?Sized
760 // unbound for any we didn't find to be Sized.
761 for tp in &stripped_params {
762 if matches!(tp.kind, types::GenericParamDefKind::Type { .. })
763 && !sized_params.contains(&tp.name)
765 where_predicates.push(WherePredicate::BoundPredicate {
766 ty: Type::Generic(tp.name),
767 bounds: vec![GenericBound::maybe_sized(cx)],
768 bound_params: Vec::new(),
773 // It would be nice to collect all of the bounds on a type and recombine
774 // them if possible, to avoid e.g., `where T: Foo, T: Bar, T: Sized, T: 'a`
775 // and instead see `where T: Foo + Bar + Sized + 'a`
778 params: stripped_params,
779 where_predicates: simplify::where_clauses(cx, where_predicates),
783 fn clean_fn_or_proc_macro<'tcx>(
784 item: &hir::Item<'tcx>,
785 sig: &hir::FnSig<'tcx>,
786 generics: &hir::Generics<'tcx>,
787 body_id: hir::BodyId,
789 cx: &mut DocContext<'tcx>,
791 let attrs = cx.tcx.hir().attrs(item.hir_id());
792 let macro_kind = attrs.iter().find_map(|a| {
793 if a.has_name(sym::proc_macro) {
794 Some(MacroKind::Bang)
795 } else if a.has_name(sym::proc_macro_derive) {
796 Some(MacroKind::Derive)
797 } else if a.has_name(sym::proc_macro_attribute) {
798 Some(MacroKind::Attr)
805 if kind == MacroKind::Derive {
807 .lists(sym::proc_macro_derive)
808 .find_map(|mi| mi.ident())
809 .expect("proc-macro derives require a name")
813 let mut helpers = Vec::new();
814 for mi in attrs.lists(sym::proc_macro_derive) {
815 if !mi.has_name(sym::attributes) {
819 if let Some(list) = mi.meta_item_list() {
820 for inner_mi in list {
821 if let Some(ident) = inner_mi.ident() {
822 helpers.push(ident.name);
827 ProcMacroItem(ProcMacro { kind, helpers })
830 let mut func = clean_function(cx, sig, generics, body_id);
831 clean_fn_decl_legacy_const_generics(&mut func, attrs);
837 /// This is needed to make it more "readable" when documenting functions using
838 /// `rustc_legacy_const_generics`. More information in
839 /// <https://github.com/rust-lang/rust/issues/83167>.
840 fn clean_fn_decl_legacy_const_generics(func: &mut Function, attrs: &[ast::Attribute]) {
841 for meta_item_list in attrs
843 .filter(|a| a.has_name(sym::rustc_legacy_const_generics))
844 .filter_map(|a| a.meta_item_list())
846 for (pos, literal) in meta_item_list.iter().filter_map(|meta| meta.literal()).enumerate() {
848 ast::LitKind::Int(a, _) => {
849 let gen = func.generics.params.remove(0);
850 if let GenericParamDef { name, kind: GenericParamDefKind::Const { ty, .. } } =
856 .insert(a as _, Argument { name, type_: *ty, is_const: true });
858 panic!("unexpected non const in position {pos}");
861 _ => panic!("invalid arg index"),
867 fn clean_function<'tcx>(
868 cx: &mut DocContext<'tcx>,
869 sig: &hir::FnSig<'tcx>,
870 generics: &hir::Generics<'tcx>,
871 body_id: hir::BodyId,
873 let (generics, decl) = enter_impl_trait(cx, |cx| {
874 // NOTE: generics must be cleaned before args
875 let generics = generics.clean(cx);
876 let args = clean_args_from_types_and_body_id(cx, sig.decl.inputs, body_id);
877 let decl = clean_fn_decl_with_args(cx, sig.decl, args);
880 Function { decl, generics }
883 fn clean_args_from_types_and_names<'tcx>(
884 cx: &mut DocContext<'tcx>,
885 types: &[hir::Ty<'tcx>],
893 let mut name = names.get(i).map_or(kw::Empty, |ident| ident.name);
895 name = kw::Underscore;
897 Argument { name, type_: ty.clean(cx), is_const: false }
903 fn clean_args_from_types_and_body_id<'tcx>(
904 cx: &mut DocContext<'tcx>,
905 types: &[hir::Ty<'tcx>],
906 body_id: hir::BodyId,
908 let body = cx.tcx.hir().body(body_id);
914 .map(|(i, ty)| Argument {
915 name: name_from_pat(body.params[i].pat),
923 fn clean_fn_decl_with_args<'tcx>(
924 cx: &mut DocContext<'tcx>,
925 decl: &hir::FnDecl<'tcx>,
928 FnDecl { inputs: args, output: decl.output.clean(cx), c_variadic: decl.c_variadic }
931 fn clean_fn_decl_from_did_and_sig<'tcx>(
932 cx: &mut DocContext<'tcx>,
934 sig: ty::PolyFnSig<'tcx>,
936 let mut names = did.map_or(&[] as &[_], |did| cx.tcx.fn_arg_names(did)).iter();
938 // We assume all empty tuples are default return type. This theoretically can discard `-> ()`,
939 // but shouldn't change any code meaning.
940 let output = match sig.skip_binder().output().clean(cx) {
941 Type::Tuple(inner) if inner.is_empty() => DefaultReturn,
947 c_variadic: sig.skip_binder().c_variadic,
955 name: names.next().map_or(kw::Empty, |i| i.name),
963 impl<'tcx> Clean<'tcx, FnRetTy> for hir::FnRetTy<'tcx> {
964 fn clean(&self, cx: &mut DocContext<'tcx>) -> FnRetTy {
966 Self::Return(typ) => Return(typ.clean(cx)),
967 Self::DefaultReturn(..) => DefaultReturn,
972 impl<'tcx> Clean<'tcx, bool> for hir::IsAuto {
973 fn clean(&self, _: &mut DocContext<'tcx>) -> bool {
975 hir::IsAuto::Yes => true,
976 hir::IsAuto::No => false,
981 impl<'tcx> Clean<'tcx, Path> for hir::TraitRef<'tcx> {
982 fn clean(&self, cx: &mut DocContext<'tcx>) -> Path {
983 let path = self.path.clean(cx);
984 register_res(cx, path.res);
989 impl<'tcx> Clean<'tcx, PolyTrait> for hir::PolyTraitRef<'tcx> {
990 fn clean(&self, cx: &mut DocContext<'tcx>) -> PolyTrait {
992 trait_: self.trait_ref.clean(cx),
994 .bound_generic_params
996 .filter(|p| !is_elided_lifetime(p))
997 .map(|x| clean_generic_param(cx, None, x))
1003 impl<'tcx> Clean<'tcx, Item> for hir::TraitItem<'tcx> {
1004 fn clean(&self, cx: &mut DocContext<'tcx>) -> Item {
1005 let local_did = self.def_id.to_def_id();
1006 cx.with_param_env(local_did, |cx| {
1007 let inner = match self.kind {
1008 hir::TraitItemKind::Const(ty, Some(default)) => AssocConstItem(
1010 ConstantKind::Local { def_id: local_did, body: default },
1012 hir::TraitItemKind::Const(ty, None) => TyAssocConstItem(ty.clean(cx)),
1013 hir::TraitItemKind::Fn(ref sig, hir::TraitFn::Provided(body)) => {
1014 let m = clean_function(cx, sig, self.generics, body);
1017 hir::TraitItemKind::Fn(ref sig, hir::TraitFn::Required(names)) => {
1018 let (generics, decl) = enter_impl_trait(cx, |cx| {
1019 // NOTE: generics must be cleaned before args
1020 let generics = self.generics.clean(cx);
1021 let args = clean_args_from_types_and_names(cx, sig.decl.inputs, names);
1022 let decl = clean_fn_decl_with_args(cx, sig.decl, args);
1025 TyMethodItem(Function { decl, generics })
1027 hir::TraitItemKind::Type(bounds, Some(default)) => {
1028 let generics = enter_impl_trait(cx, |cx| self.generics.clean(cx));
1029 let bounds = bounds.iter().filter_map(|x| x.clean(cx)).collect();
1030 let item_type = hir_ty_to_ty(cx.tcx, default).clean(cx);
1032 Typedef { type_: default.clean(cx), generics, item_type: Some(item_type) },
1036 hir::TraitItemKind::Type(bounds, None) => {
1037 let generics = enter_impl_trait(cx, |cx| self.generics.clean(cx));
1038 let bounds = bounds.iter().filter_map(|x| x.clean(cx)).collect();
1039 TyAssocTypeItem(Box::new(generics), bounds)
1042 let what_rustc_thinks =
1043 Item::from_def_id_and_parts(local_did, Some(self.ident.name), inner, cx);
1044 // Trait items always inherit the trait's visibility -- we don't want to show `pub`.
1045 Item { visibility: Inherited, ..what_rustc_thinks }
1050 impl<'tcx> Clean<'tcx, Item> for hir::ImplItem<'tcx> {
1051 fn clean(&self, cx: &mut DocContext<'tcx>) -> Item {
1052 let local_did = self.def_id.to_def_id();
1053 cx.with_param_env(local_did, |cx| {
1054 let inner = match self.kind {
1055 hir::ImplItemKind::Const(ty, expr) => {
1056 let default = ConstantKind::Local { def_id: local_did, body: expr };
1057 AssocConstItem(ty.clean(cx), default)
1059 hir::ImplItemKind::Fn(ref sig, body) => {
1060 let m = clean_function(cx, sig, self.generics, body);
1061 let defaultness = cx.tcx.associated_item(self.def_id).defaultness;
1062 MethodItem(m, Some(defaultness))
1064 hir::ImplItemKind::TyAlias(hir_ty) => {
1065 let type_ = hir_ty.clean(cx);
1066 let generics = self.generics.clean(cx);
1067 let item_type = hir_ty_to_ty(cx.tcx, hir_ty).clean(cx);
1069 Typedef { type_, generics, item_type: Some(item_type) },
1075 let mut what_rustc_thinks =
1076 Item::from_def_id_and_parts(local_did, Some(self.ident.name), inner, cx);
1078 let impl_ref = cx.tcx.impl_trait_ref(cx.tcx.local_parent(self.def_id));
1080 // Trait impl items always inherit the impl's visibility --
1081 // we don't want to show `pub`.
1082 if impl_ref.is_some() {
1083 what_rustc_thinks.visibility = Inherited;
1091 impl<'tcx> Clean<'tcx, Item> for ty::AssocItem {
1092 fn clean(&self, cx: &mut DocContext<'tcx>) -> Item {
1094 let kind = match self.kind {
1095 ty::AssocKind::Const => {
1096 let ty = tcx.type_of(self.def_id).clean(cx);
1098 let provided = match self.container {
1099 ty::ImplContainer(_) => true,
1100 ty::TraitContainer(_) => self.defaultness.has_value(),
1103 AssocConstItem(ty, ConstantKind::Extern { def_id: self.def_id })
1105 TyAssocConstItem(ty)
1108 ty::AssocKind::Fn => {
1109 let generics = clean_ty_generics(
1111 tcx.generics_of(self.def_id),
1112 tcx.explicit_predicates_of(self.def_id),
1114 let sig = tcx.fn_sig(self.def_id);
1115 let mut decl = clean_fn_decl_from_did_and_sig(cx, Some(self.def_id), sig);
1117 if self.fn_has_self_parameter {
1118 let self_ty = match self.container {
1119 ty::ImplContainer(def_id) => tcx.type_of(def_id),
1120 ty::TraitContainer(_) => tcx.types.self_param,
1122 let self_arg_ty = sig.input(0).skip_binder();
1123 if self_arg_ty == self_ty {
1124 decl.inputs.values[0].type_ = Generic(kw::SelfUpper);
1125 } else if let ty::Ref(_, ty, _) = *self_arg_ty.kind() {
1127 match decl.inputs.values[0].type_ {
1128 BorrowedRef { ref mut type_, .. } => {
1129 **type_ = Generic(kw::SelfUpper)
1131 _ => unreachable!(),
1137 let provided = match self.container {
1138 ty::ImplContainer(_) => true,
1139 ty::TraitContainer(_) => self.defaultness.has_value(),
1142 let defaultness = match self.container {
1143 ty::ImplContainer(_) => Some(self.defaultness),
1144 ty::TraitContainer(_) => None,
1146 MethodItem(Function { generics, decl }, defaultness)
1148 TyMethodItem(Function { generics, decl })
1151 ty::AssocKind::Type => {
1152 let my_name = self.name;
1154 fn param_eq_arg(param: &GenericParamDef, arg: &GenericArg) -> bool {
1155 match (¶m.kind, arg) {
1156 (GenericParamDefKind::Type { .. }, GenericArg::Type(Type::Generic(ty)))
1157 if *ty == param.name =>
1162 GenericParamDefKind::Lifetime { .. },
1163 GenericArg::Lifetime(Lifetime(lt)),
1164 ) if *lt == param.name => true,
1165 (GenericParamDefKind::Const { .. }, GenericArg::Const(c)) => {
1167 ConstantKind::TyConst { expr } => expr == param.name.as_str(),
1175 if let ty::TraitContainer(_) = self.container {
1176 let bounds = tcx.explicit_item_bounds(self.def_id);
1177 let predicates = ty::GenericPredicates { parent: None, predicates: bounds };
1179 clean_ty_generics(cx, tcx.generics_of(self.def_id), predicates);
1180 // Filter out the bounds that are (likely?) directly attached to the associated type,
1181 // as opposed to being located in the where clause.
1182 let mut bounds = generics
1184 .drain_filter(|pred| match *pred {
1185 WherePredicate::BoundPredicate {
1186 ty: QPath { ref assoc, ref self_type, ref trait_, .. },
1189 if assoc.name != my_name {
1192 if trait_.def_id() != self.container.id() {
1196 Generic(ref s) if *s == kw::SelfUpper => {}
1200 GenericArgs::AngleBracketed { args, bindings } => {
1201 if !bindings.is_empty()
1206 .any(|(param, arg)| !param_eq_arg(param, arg))
1211 GenericArgs::Parenthesized { .. } => {
1212 // The only time this happens is if we're inside the rustdoc for Fn(),
1213 // which only has one associated type, which is not a GAT, so whatever.
1221 if let WherePredicate::BoundPredicate { bounds, .. } = pred {
1227 .collect::<Vec<_>>();
1228 // Our Sized/?Sized bound didn't get handled when creating the generics
1229 // because we didn't actually get our whole set of bounds until just now
1230 // (some of them may have come from the trait). If we do have a sized
1231 // bound, we remove it, and if we don't then we add the `?Sized` bound
1233 match bounds.iter().position(|b| b.is_sized_bound(cx)) {
1237 None => bounds.push(GenericBound::maybe_sized(cx)),
1240 if self.defaultness.has_value() {
1243 type_: tcx.type_of(self.def_id).clean(cx),
1245 // FIXME: should we obtain the Type from HIR and pass it on here?
1251 TyAssocTypeItem(Box::new(generics), bounds)
1254 // FIXME: when could this happen? Associated items in inherent impls?
1257 type_: tcx.type_of(self.def_id).clean(cx),
1258 generics: Generics { params: Vec::new(), where_predicates: Vec::new() },
1267 let mut what_rustc_thinks =
1268 Item::from_def_id_and_parts(self.def_id, Some(self.name), kind, cx);
1270 let impl_ref = tcx.impl_trait_ref(tcx.parent(self.def_id));
1272 // Trait impl items always inherit the impl's visibility --
1273 // we don't want to show `pub`.
1274 if impl_ref.is_some() {
1275 what_rustc_thinks.visibility = Visibility::Inherited;
1282 fn clean_qpath<'tcx>(hir_ty: &hir::Ty<'tcx>, cx: &mut DocContext<'tcx>) -> Type {
1283 let hir::Ty { hir_id: _, span, ref kind } = *hir_ty;
1284 let hir::TyKind::Path(qpath) = kind else { unreachable!() };
1287 hir::QPath::Resolved(None, path) => {
1288 if let Res::Def(DefKind::TyParam, did) = path.res {
1289 if let Some(new_ty) = cx.substs.get(&did).and_then(|p| p.as_ty()).cloned() {
1292 if let Some(bounds) = cx.impl_trait_bounds.remove(&did.into()) {
1293 return ImplTrait(bounds);
1297 if let Some(expanded) = maybe_expand_private_type_alias(cx, path) {
1300 let path = path.clean(cx);
1301 resolve_type(cx, path)
1304 hir::QPath::Resolved(Some(qself), p) => {
1305 // Try to normalize `<X as Y>::T` to a type
1306 let ty = hir_ty_to_ty(cx.tcx, hir_ty);
1307 if let Some(normalized_value) = normalize(cx, ty) {
1308 return normalized_value.clean(cx);
1311 let trait_segments = &p.segments[..p.segments.len() - 1];
1312 let trait_def = cx.tcx.associated_item(p.res.def_id()).container.id();
1313 let trait_ = self::Path {
1314 res: Res::Def(DefKind::Trait, trait_def),
1315 segments: trait_segments.iter().map(|x| x.clean(cx)).collect(),
1317 register_res(cx, trait_.res);
1318 let self_def_id = DefId::local(qself.hir_id.owner.local_def_index);
1319 let self_type = qself.clean(cx);
1320 let should_show_cast = compute_should_show_cast(Some(self_def_id), &trait_, &self_type);
1322 assoc: Box::new(p.segments.last().expect("segments were empty").clean(cx)),
1324 self_type: box self_type,
1328 hir::QPath::TypeRelative(qself, segment) => {
1329 let ty = hir_ty_to_ty(cx.tcx, hir_ty);
1330 let res = match ty.kind() {
1331 ty::Projection(proj) => Res::Def(DefKind::Trait, proj.trait_ref(cx.tcx).def_id),
1332 // Rustdoc handles `ty::Error`s by turning them into `Type::Infer`s.
1333 ty::Error(_) => return Type::Infer,
1334 _ => bug!("clean: expected associated type, found `{:?}`", ty),
1336 let trait_ = hir::Path { span, res, segments: &[] }.clean(cx);
1337 register_res(cx, trait_.res);
1338 let self_def_id = res.opt_def_id();
1339 let self_type = qself.clean(cx);
1340 let should_show_cast = compute_should_show_cast(self_def_id, &trait_, &self_type);
1342 assoc: Box::new(segment.clean(cx)),
1344 self_type: box self_type,
1348 hir::QPath::LangItem(..) => bug!("clean: requiring documentation of lang item"),
1352 fn maybe_expand_private_type_alias<'tcx>(
1353 cx: &mut DocContext<'tcx>,
1354 path: &hir::Path<'tcx>,
1356 let Res::Def(DefKind::TyAlias, def_id) = path.res else { return None };
1357 // Substitute private type aliases
1358 let def_id = def_id.as_local()?;
1359 let alias = if !cx.cache.access_levels.is_exported(def_id.to_def_id()) {
1360 &cx.tcx.hir().expect_item(def_id).kind
1364 let hir::ItemKind::TyAlias(ty, generics) = alias else { return None };
1366 let provided_params = &path.segments.last().expect("segments were empty");
1367 let mut substs = FxHashMap::default();
1368 let generic_args = provided_params.args();
1370 let mut indices: hir::GenericParamCount = Default::default();
1371 for param in generics.params.iter() {
1373 hir::GenericParamKind::Lifetime { .. } => {
1375 let lifetime = generic_args.args.iter().find_map(|arg| match arg {
1376 hir::GenericArg::Lifetime(lt) => {
1377 if indices.lifetimes == j {
1385 if let Some(lt) = lifetime.cloned() {
1386 let lt_def_id = cx.tcx.hir().local_def_id(param.hir_id);
1387 let cleaned = if !lt.is_elided() { lt.clean(cx) } else { Lifetime::elided() };
1388 substs.insert(lt_def_id.to_def_id(), SubstParam::Lifetime(cleaned));
1390 indices.lifetimes += 1;
1392 hir::GenericParamKind::Type { ref default, .. } => {
1393 let ty_param_def_id = cx.tcx.hir().local_def_id(param.hir_id);
1395 let type_ = generic_args.args.iter().find_map(|arg| match arg {
1396 hir::GenericArg::Type(ty) => {
1397 if indices.types == j {
1405 if let Some(ty) = type_ {
1406 substs.insert(ty_param_def_id.to_def_id(), SubstParam::Type(ty.clean(cx)));
1407 } else if let Some(default) = *default {
1408 substs.insert(ty_param_def_id.to_def_id(), SubstParam::Type(default.clean(cx)));
1412 hir::GenericParamKind::Const { .. } => {
1413 let const_param_def_id = cx.tcx.hir().local_def_id(param.hir_id);
1415 let const_ = generic_args.args.iter().find_map(|arg| match arg {
1416 hir::GenericArg::Const(ct) => {
1417 if indices.consts == j {
1425 if let Some(ct) = const_ {
1427 .insert(const_param_def_id.to_def_id(), SubstParam::Constant(ct.clean(cx)));
1429 // FIXME(const_generics_defaults)
1430 indices.consts += 1;
1435 Some(cx.enter_alias(substs, |cx| ty.clean(cx)))
1438 impl<'tcx> Clean<'tcx, Type> for hir::Ty<'tcx> {
1439 fn clean(&self, cx: &mut DocContext<'tcx>) -> Type {
1443 TyKind::Never => Primitive(PrimitiveType::Never),
1444 TyKind::Ptr(ref m) => RawPointer(m.mutbl, box m.ty.clean(cx)),
1445 TyKind::Rptr(ref l, ref m) => {
1446 // There are two times a `Fresh` lifetime can be created:
1447 // 1. For `&'_ x`, written by the user. This corresponds to `lower_lifetime` in `rustc_ast_lowering`.
1448 // 2. For `&x` as a parameter to an `async fn`. This corresponds to `elided_ref_lifetime in `rustc_ast_lowering`.
1449 // See #59286 for more information.
1450 // Ideally we would only hide the `'_` for case 2., but I don't know a way to distinguish it.
1451 // Turning `fn f(&'_ self)` into `fn f(&self)` isn't the worst thing in the world, though;
1452 // there's no case where it could cause the function to fail to compile.
1454 l.is_elided() || matches!(l.name, LifetimeName::Param(_, ParamName::Fresh));
1455 let lifetime = if elided { None } else { Some(l.clean(cx)) };
1456 BorrowedRef { lifetime, mutability: m.mutbl, type_: box m.ty.clean(cx) }
1458 TyKind::Slice(ty) => Slice(box ty.clean(cx)),
1459 TyKind::Array(ty, ref length) => {
1460 let length = match length {
1461 hir::ArrayLen::Infer(_, _) => "_".to_string(),
1462 hir::ArrayLen::Body(anon_const) => {
1463 let def_id = cx.tcx.hir().local_def_id(anon_const.hir_id);
1464 // NOTE(min_const_generics): We can't use `const_eval_poly` for constants
1465 // as we currently do not supply the parent generics to anonymous constants
1466 // but do allow `ConstKind::Param`.
1468 // `const_eval_poly` tries to to first substitute generic parameters which
1469 // results in an ICE while manually constructing the constant and using `eval`
1470 // does nothing for `ConstKind::Param`.
1471 let ct = ty::Const::from_anon_const(cx.tcx, def_id);
1472 let param_env = cx.tcx.param_env(def_id);
1473 print_const(cx, ct.eval(cx.tcx, param_env))
1477 Array(box ty.clean(cx), length)
1479 TyKind::Tup(tys) => Tuple(tys.iter().map(|x| x.clean(cx)).collect()),
1480 TyKind::OpaqueDef(item_id, _) => {
1481 let item = cx.tcx.hir().item(item_id);
1482 if let hir::ItemKind::OpaqueTy(ref ty) = item.kind {
1483 ImplTrait(ty.bounds.iter().filter_map(|x| x.clean(cx)).collect())
1488 TyKind::Path(_) => clean_qpath(self, cx),
1489 TyKind::TraitObject(bounds, ref lifetime, _) => {
1490 let bounds = bounds.iter().map(|bound| bound.clean(cx)).collect();
1491 let lifetime = if !lifetime.is_elided() { Some(lifetime.clean(cx)) } else { None };
1492 DynTrait(bounds, lifetime)
1494 TyKind::BareFn(barefn) => BareFunction(box barefn.clean(cx)),
1495 // Rustdoc handles `TyKind::Err`s by turning them into `Type::Infer`s.
1496 TyKind::Infer | TyKind::Err => Infer,
1497 TyKind::Typeof(..) => panic!("unimplemented type {:?}", self.kind),
1502 /// Returns `None` if the type could not be normalized
1503 fn normalize<'tcx>(cx: &mut DocContext<'tcx>, ty: Ty<'_>) -> Option<Ty<'tcx>> {
1504 // HACK: low-churn fix for #79459 while we wait for a trait normalization fix
1505 if !cx.tcx.sess.opts.debugging_opts.normalize_docs {
1509 use crate::rustc_trait_selection::infer::TyCtxtInferExt;
1510 use crate::rustc_trait_selection::traits::query::normalize::AtExt;
1511 use rustc_middle::traits::ObligationCause;
1513 // Try to normalize `<X as Y>::T` to a type
1514 let lifted = ty.lift_to_tcx(cx.tcx).unwrap();
1515 let normalized = cx.tcx.infer_ctxt().enter(|infcx| {
1517 .at(&ObligationCause::dummy(), cx.param_env)
1519 .map(|resolved| infcx.resolve_vars_if_possible(resolved.value))
1522 Ok(normalized_value) => {
1523 debug!("normalized {:?} to {:?}", ty, normalized_value);
1524 Some(normalized_value)
1527 debug!("failed to normalize {:?}: {:?}", ty, err);
1533 fn clean_ty<'tcx>(this: Ty<'tcx>, cx: &mut DocContext<'tcx>, def_id: Option<DefId>) -> Type {
1534 trace!("cleaning type: {:?}", this);
1535 let ty = normalize(cx, this).unwrap_or(this);
1537 ty::Never => Primitive(PrimitiveType::Never),
1538 ty::Bool => Primitive(PrimitiveType::Bool),
1539 ty::Char => Primitive(PrimitiveType::Char),
1540 ty::Int(int_ty) => Primitive(int_ty.into()),
1541 ty::Uint(uint_ty) => Primitive(uint_ty.into()),
1542 ty::Float(float_ty) => Primitive(float_ty.into()),
1543 ty::Str => Primitive(PrimitiveType::Str),
1544 ty::Slice(ty) => Slice(box ty.clean(cx)),
1545 ty::Array(ty, n) => {
1546 let mut n = cx.tcx.lift(n).expect("array lift failed");
1547 n = n.eval(cx.tcx, ty::ParamEnv::reveal_all());
1548 let n = print_const(cx, n);
1549 Array(box ty.clean(cx), n)
1551 ty::RawPtr(mt) => RawPointer(mt.mutbl, box mt.ty.clean(cx)),
1552 ty::Ref(r, ty, mutbl) => {
1553 BorrowedRef { lifetime: r.clean(cx), mutability: mutbl, type_: box ty.clean(cx) }
1555 ty::FnDef(..) | ty::FnPtr(_) => {
1556 let ty = cx.tcx.lift(this).expect("FnPtr lift failed");
1557 let sig = ty.fn_sig(cx.tcx);
1558 let decl = clean_fn_decl_from_did_and_sig(cx, None, sig);
1559 BareFunction(box BareFunctionDecl {
1560 unsafety: sig.unsafety(),
1561 generic_params: Vec::new(),
1566 ty::Adt(def, substs) => {
1567 let did = def.did();
1568 let kind = match def.adt_kind() {
1569 AdtKind::Struct => ItemType::Struct,
1570 AdtKind::Union => ItemType::Union,
1571 AdtKind::Enum => ItemType::Enum,
1573 inline::record_extern_fqn(cx, did, kind);
1574 let path = external_path(cx, did, false, vec![], substs);
1577 ty::Foreign(did) => {
1578 inline::record_extern_fqn(cx, did, ItemType::ForeignType);
1579 let path = external_path(cx, did, false, vec![], InternalSubsts::empty());
1582 ty::Dynamic(obj, ref reg) => {
1583 // HACK: pick the first `did` as the `did` of the trait object. Someone
1584 // might want to implement "native" support for marker-trait-only
1586 let mut dids = obj.principal_def_id().into_iter().chain(obj.auto_traits());
1589 .unwrap_or_else(|| panic!("found trait object `{:?}` with no traits?", this));
1590 let substs = match obj.principal() {
1591 Some(principal) => principal.skip_binder().substs,
1592 // marker traits have no substs.
1593 _ => cx.tcx.intern_substs(&[]),
1596 inline::record_extern_fqn(cx, did, ItemType::Trait);
1598 let lifetime = reg.clean(cx);
1599 let mut bounds = vec![];
1602 let empty = cx.tcx.intern_substs(&[]);
1603 let path = external_path(cx, did, false, vec![], empty);
1604 inline::record_extern_fqn(cx, did, ItemType::Trait);
1605 let bound = PolyTrait { trait_: path, generic_params: Vec::new() };
1609 let mut bindings = vec![];
1610 for pb in obj.projection_bounds() {
1611 bindings.push(TypeBinding {
1612 assoc: projection_to_path_segment(
1614 .lift_to_tcx(cx.tcx)
1616 // HACK(compiler-errors): Doesn't actually matter what self
1617 // type we put here, because we're only using the GAT's substs.
1618 .with_self_ty(cx.tcx, cx.tcx.types.self_param)
1622 kind: TypeBindingKind::Equality { term: pb.skip_binder().term.clean(cx) },
1626 let path = external_path(cx, did, false, bindings, substs);
1627 bounds.insert(0, PolyTrait { trait_: path, generic_params: Vec::new() });
1629 DynTrait(bounds, lifetime)
1631 ty::Tuple(t) => Tuple(t.iter().map(|t| t.clean(cx)).collect()),
1633 ty::Projection(ref data) => clean_projection(*data, cx, def_id),
1635 ty::Param(ref p) => {
1636 if let Some(bounds) = cx.impl_trait_bounds.remove(&p.index.into()) {
1643 ty::Opaque(def_id, substs) => {
1644 // Grab the "TraitA + TraitB" from `impl TraitA + TraitB`,
1645 // by looking up the bounds associated with the def_id.
1646 let substs = cx.tcx.lift(substs).expect("Opaque lift failed");
1649 .explicit_item_bounds(def_id)
1651 .map(|(bound, _)| EarlyBinder(*bound).subst(cx.tcx, substs))
1652 .collect::<Vec<_>>();
1653 let mut regions = vec![];
1654 let mut has_sized = false;
1655 let mut bounds = bounds
1657 .filter_map(|bound| {
1658 let bound_predicate = bound.kind();
1659 let trait_ref = match bound_predicate.skip_binder() {
1660 ty::PredicateKind::Trait(tr) => bound_predicate.rebind(tr.trait_ref),
1661 ty::PredicateKind::TypeOutlives(ty::OutlivesPredicate(_ty, reg)) => {
1662 if let Some(r) = reg.clean(cx) {
1663 regions.push(GenericBound::Outlives(r));
1670 if let Some(sized) = cx.tcx.lang_items().sized_trait() {
1671 if trait_ref.def_id() == sized {
1677 let bindings: Vec<_> = bounds
1679 .filter_map(|bound| {
1680 if let ty::PredicateKind::Projection(proj) = bound.kind().skip_binder()
1682 if proj.projection_ty.trait_ref(cx.tcx) == trait_ref.skip_binder() {
1684 assoc: projection_to_path_segment(proj.projection_ty, cx),
1685 kind: TypeBindingKind::Equality {
1686 term: proj.term.clean(cx),
1698 Some(clean_poly_trait_ref_with_bindings(cx, trait_ref, &bindings))
1700 .collect::<Vec<_>>();
1701 bounds.extend(regions);
1702 if !has_sized && !bounds.is_empty() {
1703 bounds.insert(0, GenericBound::maybe_sized(cx));
1708 ty::Closure(..) => panic!("Closure"),
1709 ty::Generator(..) => panic!("Generator"),
1710 ty::Bound(..) => panic!("Bound"),
1711 ty::Placeholder(..) => panic!("Placeholder"),
1712 ty::GeneratorWitness(..) => panic!("GeneratorWitness"),
1713 ty::Infer(..) => panic!("Infer"),
1714 ty::Error(_) => panic!("Error"),
1718 impl<'tcx> Clean<'tcx, Type> for Ty<'tcx> {
1719 fn clean(&self, cx: &mut DocContext<'tcx>) -> Type {
1720 clean_ty(*self, cx, None)
1724 impl<'tcx> Clean<'tcx, Constant> for ty::Const<'tcx> {
1725 fn clean(&self, cx: &mut DocContext<'tcx>) -> Constant {
1726 // FIXME: instead of storing the stringified expression, store `self` directly instead.
1728 type_: self.ty().clean(cx),
1729 kind: ConstantKind::TyConst { expr: self.to_string() },
1734 impl<'tcx> Clean<'tcx, Item> for hir::FieldDef<'tcx> {
1735 fn clean(&self, cx: &mut DocContext<'tcx>) -> Item {
1736 let def_id = cx.tcx.hir().local_def_id(self.hir_id).to_def_id();
1737 clean_field(def_id, self.ident.name, self.ty.clean(cx), cx)
1741 impl<'tcx> Clean<'tcx, Item> for ty::FieldDef {
1742 fn clean(&self, cx: &mut DocContext<'tcx>) -> Item {
1743 clean_field(self.did, self.name, cx.tcx.type_of(self.did).clean(cx), cx)
1747 fn clean_field(def_id: DefId, name: Symbol, ty: Type, cx: &mut DocContext<'_>) -> Item {
1748 let what_rustc_thinks =
1749 Item::from_def_id_and_parts(def_id, Some(name), StructFieldItem(ty), cx);
1750 if is_field_vis_inherited(cx.tcx, def_id) {
1751 // Variant fields inherit their enum's visibility.
1752 Item { visibility: Visibility::Inherited, ..what_rustc_thinks }
1758 fn is_field_vis_inherited(tcx: TyCtxt<'_>, def_id: DefId) -> bool {
1759 let parent = tcx.parent(def_id);
1760 match tcx.def_kind(parent) {
1761 DefKind::Struct | DefKind::Union => false,
1762 DefKind::Variant => true,
1763 parent_kind => panic!("unexpected parent kind: {:?}", parent_kind),
1767 impl<'tcx> Clean<'tcx, Visibility> for ty::Visibility {
1768 fn clean(&self, _cx: &mut DocContext<'_>) -> Visibility {
1770 ty::Visibility::Public => Visibility::Public,
1771 // NOTE: this is not quite right: `ty` uses `Invisible` to mean 'private',
1772 // while rustdoc really does mean inherited. That means that for enum variants, such as
1773 // `pub enum E { V }`, `V` will be marked as `Public` by `ty`, but as `Inherited` by rustdoc.
1774 // Various parts of clean override `tcx.visibility` explicitly to make sure this distinction is captured.
1775 ty::Visibility::Invisible => Visibility::Inherited,
1776 ty::Visibility::Restricted(module) => Visibility::Restricted(module),
1781 impl<'tcx> Clean<'tcx, VariantStruct> for rustc_hir::VariantData<'tcx> {
1782 fn clean(&self, cx: &mut DocContext<'tcx>) -> VariantStruct {
1784 struct_type: CtorKind::from_hir(self),
1785 fields: self.fields().iter().map(|x| x.clean(cx)).collect(),
1790 impl<'tcx> Clean<'tcx, Vec<Item>> for hir::VariantData<'tcx> {
1791 fn clean(&self, cx: &mut DocContext<'tcx>) -> Vec<Item> {
1792 self.fields().iter().map(|x| x.clean(cx)).collect()
1796 impl<'tcx> Clean<'tcx, Item> for ty::VariantDef {
1797 fn clean(&self, cx: &mut DocContext<'tcx>) -> Item {
1798 let kind = match self.ctor_kind {
1799 CtorKind::Const => Variant::CLike,
1801 Variant::Tuple(self.fields.iter().map(|field| field.clean(cx)).collect())
1803 CtorKind::Fictive => Variant::Struct(VariantStruct {
1804 struct_type: CtorKind::Fictive,
1805 fields: self.fields.iter().map(|field| field.clean(cx)).collect(),
1808 let what_rustc_thinks =
1809 Item::from_def_id_and_parts(self.def_id, Some(self.name), VariantItem(kind), cx);
1810 // don't show `pub` for variants, which always inherit visibility
1811 Item { visibility: Inherited, ..what_rustc_thinks }
1815 impl<'tcx> Clean<'tcx, Variant> for hir::VariantData<'tcx> {
1816 fn clean(&self, cx: &mut DocContext<'tcx>) -> Variant {
1818 hir::VariantData::Struct(..) => Variant::Struct(self.clean(cx)),
1819 hir::VariantData::Tuple(..) => Variant::Tuple(self.clean(cx)),
1820 hir::VariantData::Unit(..) => Variant::CLike,
1825 impl<'tcx> Clean<'tcx, Path> for hir::Path<'tcx> {
1826 fn clean(&self, cx: &mut DocContext<'tcx>) -> Path {
1827 Path { res: self.res, segments: self.segments.iter().map(|x| x.clean(cx)).collect() }
1831 impl<'tcx> Clean<'tcx, GenericArgs> for hir::GenericArgs<'tcx> {
1832 fn clean(&self, cx: &mut DocContext<'tcx>) -> GenericArgs {
1833 if self.parenthesized {
1834 let output = self.bindings[0].ty().clean(cx);
1836 if output != Type::Tuple(Vec::new()) { Some(Box::new(output)) } else { None };
1837 let inputs = self.inputs().iter().map(|x| x.clean(cx)).collect::<Vec<_>>().into();
1838 GenericArgs::Parenthesized { inputs, output }
1843 .map(|arg| match arg {
1844 hir::GenericArg::Lifetime(lt) if !lt.is_elided() => {
1845 GenericArg::Lifetime(lt.clean(cx))
1847 hir::GenericArg::Lifetime(_) => GenericArg::Lifetime(Lifetime::elided()),
1848 hir::GenericArg::Type(ty) => GenericArg::Type(ty.clean(cx)),
1849 hir::GenericArg::Const(ct) => GenericArg::Const(Box::new(ct.clean(cx))),
1850 hir::GenericArg::Infer(_inf) => GenericArg::Infer,
1852 .collect::<Vec<_>>()
1854 let bindings = self.bindings.iter().map(|x| x.clean(cx)).collect::<Vec<_>>().into();
1855 GenericArgs::AngleBracketed { args, bindings }
1860 impl<'tcx> Clean<'tcx, PathSegment> for hir::PathSegment<'tcx> {
1861 fn clean(&self, cx: &mut DocContext<'tcx>) -> PathSegment {
1862 PathSegment { name: self.ident.name, args: self.args().clean(cx) }
1866 impl<'tcx> Clean<'tcx, BareFunctionDecl> for hir::BareFnTy<'tcx> {
1867 fn clean(&self, cx: &mut DocContext<'tcx>) -> BareFunctionDecl {
1868 let (generic_params, decl) = enter_impl_trait(cx, |cx| {
1869 // NOTE: generics must be cleaned before args
1870 let generic_params = self
1873 .filter(|p| !is_elided_lifetime(p))
1874 .map(|x| clean_generic_param(cx, None, x))
1876 let args = clean_args_from_types_and_names(cx, self.decl.inputs, self.param_names);
1877 let decl = clean_fn_decl_with_args(cx, self.decl, args);
1878 (generic_params, decl)
1880 BareFunctionDecl { unsafety: self.unsafety, abi: self.abi, decl, generic_params }
1884 fn clean_maybe_renamed_item<'tcx>(
1885 cx: &mut DocContext<'tcx>,
1886 item: &hir::Item<'tcx>,
1887 renamed: Option<Symbol>,
1891 let def_id = item.def_id.to_def_id();
1892 let mut name = renamed.unwrap_or_else(|| cx.tcx.hir().name(item.hir_id()));
1893 cx.with_param_env(def_id, |cx| {
1894 let kind = match item.kind {
1895 ItemKind::Static(ty, mutability, body_id) => {
1896 StaticItem(Static { type_: ty.clean(cx), mutability, expr: Some(body_id) })
1898 ItemKind::Const(ty, body_id) => ConstantItem(Constant {
1899 type_: ty.clean(cx),
1900 kind: ConstantKind::Local { body: body_id, def_id },
1902 ItemKind::OpaqueTy(ref ty) => OpaqueTyItem(OpaqueTy {
1903 bounds: ty.bounds.iter().filter_map(|x| x.clean(cx)).collect(),
1904 generics: ty.generics.clean(cx),
1906 ItemKind::TyAlias(hir_ty, generics) => {
1907 let rustdoc_ty = hir_ty.clean(cx);
1908 let ty = hir_ty_to_ty(cx.tcx, hir_ty).clean(cx);
1909 TypedefItem(Typedef {
1911 generics: generics.clean(cx),
1912 item_type: Some(ty),
1915 ItemKind::Enum(ref def, generics) => EnumItem(Enum {
1916 variants: def.variants.iter().map(|v| v.clean(cx)).collect(),
1917 generics: generics.clean(cx),
1919 ItemKind::TraitAlias(generics, bounds) => TraitAliasItem(TraitAlias {
1920 generics: generics.clean(cx),
1921 bounds: bounds.iter().filter_map(|x| x.clean(cx)).collect(),
1923 ItemKind::Union(ref variant_data, generics) => UnionItem(Union {
1924 generics: generics.clean(cx),
1925 fields: variant_data.fields().iter().map(|x| x.clean(cx)).collect(),
1927 ItemKind::Struct(ref variant_data, generics) => StructItem(Struct {
1928 struct_type: CtorKind::from_hir(variant_data),
1929 generics: generics.clean(cx),
1930 fields: variant_data.fields().iter().map(|x| x.clean(cx)).collect(),
1932 ItemKind::Impl(impl_) => return clean_impl(impl_, item.hir_id(), cx),
1933 // proc macros can have a name set by attributes
1934 ItemKind::Fn(ref sig, generics, body_id) => {
1935 clean_fn_or_proc_macro(item, sig, generics, body_id, &mut name, cx)
1937 ItemKind::Macro(ref macro_def, _) => {
1938 let ty_vis = cx.tcx.visibility(def_id).clean(cx);
1940 source: display_macro_source(cx, name, macro_def, def_id, ty_vis),
1943 ItemKind::Trait(is_auto, unsafety, generics, bounds, item_ids) => {
1945 item_ids.iter().map(|ti| cx.tcx.hir().trait_item(ti.id).clean(cx)).collect();
1949 generics: generics.clean(cx),
1950 bounds: bounds.iter().filter_map(|x| x.clean(cx)).collect(),
1951 is_auto: is_auto.clean(cx),
1954 ItemKind::ExternCrate(orig_name) => {
1955 return clean_extern_crate(item, name, orig_name, cx);
1957 ItemKind::Use(path, kind) => {
1958 return clean_use_statement(item, name, path, kind, cx);
1960 _ => unreachable!("not yet converted"),
1963 vec![Item::from_def_id_and_parts(def_id, Some(name), kind, cx)]
1967 impl<'tcx> Clean<'tcx, Item> for hir::Variant<'tcx> {
1968 fn clean(&self, cx: &mut DocContext<'tcx>) -> Item {
1969 let kind = VariantItem(self.data.clean(cx));
1970 let what_rustc_thinks =
1971 Item::from_hir_id_and_parts(self.id, Some(self.ident.name), kind, cx);
1972 // don't show `pub` for variants, which are always public
1973 Item { visibility: Inherited, ..what_rustc_thinks }
1977 fn clean_impl<'tcx>(
1978 impl_: &hir::Impl<'tcx>,
1980 cx: &mut DocContext<'tcx>,
1983 let mut ret = Vec::new();
1984 let trait_ = impl_.of_trait.as_ref().map(|t| t.clean(cx));
1986 impl_.items.iter().map(|ii| tcx.hir().impl_item(ii.id).clean(cx)).collect::<Vec<_>>();
1987 let def_id = tcx.hir().local_def_id(hir_id);
1989 // If this impl block is an implementation of the Deref trait, then we
1990 // need to try inlining the target's inherent impl blocks as well.
1991 if trait_.as_ref().map(|t| t.def_id()) == tcx.lang_items().deref_trait() {
1992 build_deref_target_impls(cx, &items, &mut ret);
1995 let for_ = impl_.self_ty.clean(cx);
1996 let type_alias = for_.def_id(&cx.cache).and_then(|did| match tcx.def_kind(did) {
1997 DefKind::TyAlias => Some(tcx.type_of(did).clean(cx)),
2000 let mut make_item = |trait_: Option<Path>, for_: Type, items: Vec<Item>| {
2001 let kind = ImplItem(Impl {
2002 unsafety: impl_.unsafety,
2003 generics: impl_.generics.clean(cx),
2007 polarity: tcx.impl_polarity(def_id),
2008 kind: if utils::has_doc_flag(tcx, def_id.to_def_id(), sym::tuple_variadic) {
2009 ImplKind::TupleVaradic
2014 Item::from_hir_id_and_parts(hir_id, None, kind, cx)
2016 if let Some(type_alias) = type_alias {
2017 ret.push(make_item(trait_.clone(), type_alias, items.clone()));
2019 ret.push(make_item(trait_, for_, items));
2023 fn clean_extern_crate<'tcx>(
2024 krate: &hir::Item<'tcx>,
2026 orig_name: Option<Symbol>,
2027 cx: &mut DocContext<'tcx>,
2029 // this is the ID of the `extern crate` statement
2030 let cnum = cx.tcx.extern_mod_stmt_cnum(krate.def_id).unwrap_or(LOCAL_CRATE);
2031 // this is the ID of the crate itself
2032 let crate_def_id = cnum.as_def_id();
2033 let attrs = cx.tcx.hir().attrs(krate.hir_id());
2034 let ty_vis = cx.tcx.visibility(krate.def_id);
2035 let please_inline = ty_vis.is_public()
2036 && attrs.iter().any(|a| {
2037 a.has_name(sym::doc)
2038 && match a.meta_item_list() {
2039 Some(l) => attr::list_contains_name(&l, sym::inline),
2045 let mut visited = FxHashSet::default();
2047 let res = Res::Def(DefKind::Mod, crate_def_id);
2049 if let Some(items) = inline::try_inline(
2051 cx.tcx.parent_module(krate.hir_id()).to_def_id(),
2052 Some(krate.def_id.to_def_id()),
2062 // FIXME: using `from_def_id_and_kind` breaks `rustdoc/masked` for some reason
2065 attrs: box attrs.clean(cx),
2066 item_id: crate_def_id.into(),
2067 visibility: ty_vis.clean(cx),
2068 kind: box ExternCrateItem { src: orig_name },
2069 cfg: attrs.cfg(cx.tcx, &cx.cache.hidden_cfg),
2073 fn clean_use_statement<'tcx>(
2074 import: &hir::Item<'tcx>,
2076 path: &hir::Path<'tcx>,
2078 cx: &mut DocContext<'tcx>,
2080 // We need this comparison because some imports (for std types for example)
2081 // are "inserted" as well but directly by the compiler and they should not be
2082 // taken into account.
2083 if import.span.ctxt().outer_expn_data().kind == ExpnKind::AstPass(AstPass::StdImports) {
2087 let visibility = cx.tcx.visibility(import.def_id);
2088 let attrs = cx.tcx.hir().attrs(import.hir_id());
2089 let inline_attr = attrs.lists(sym::doc).get_word_attr(sym::inline);
2090 let pub_underscore = visibility.is_public() && name == kw::Underscore;
2091 let current_mod = cx.tcx.parent_module_from_def_id(import.def_id);
2093 // The parent of the module in which this import resides. This
2094 // is the same as `current_mod` if that's already the top
2096 let parent_mod = cx.tcx.parent_module_from_def_id(current_mod);
2098 // This checks if the import can be seen from a higher level module.
2099 // In other words, it checks if the visibility is the equivalent of
2100 // `pub(super)` or higher. If the current module is the top level
2101 // module, there isn't really a parent module, which makes the results
2102 // meaningless. In this case, we make sure the answer is `false`.
2103 let is_visible_from_parent_mod = visibility.is_accessible_from(parent_mod.to_def_id(), cx.tcx)
2104 && !current_mod.is_top_level_module();
2107 if let Some(ref inline) = inline_attr {
2108 rustc_errors::struct_span_err!(
2112 "anonymous imports cannot be inlined"
2114 .span_label(import.span, "anonymous import")
2119 // We consider inlining the documentation of `pub use` statements, but we
2120 // forcefully don't inline if this is not public or if the
2121 // #[doc(no_inline)] attribute is present.
2122 // Don't inline doc(hidden) imports so they can be stripped at a later stage.
2123 let mut denied = !(visibility.is_public()
2124 || (cx.render_options.document_private && is_visible_from_parent_mod))
2126 || attrs.iter().any(|a| {
2127 a.has_name(sym::doc)
2128 && match a.meta_item_list() {
2130 attr::list_contains_name(&l, sym::no_inline)
2131 || attr::list_contains_name(&l, sym::hidden)
2137 // Also check whether imports were asked to be inlined, in case we're trying to re-export a
2138 // crate in Rust 2018+
2139 let path = path.clean(cx);
2140 let inner = if kind == hir::UseKind::Glob {
2142 let mut visited = FxHashSet::default();
2143 if let Some(items) = inline::try_inline_glob(cx, path.res, &mut visited) {
2147 Import::new_glob(resolve_use_source(cx, path), true)
2149 if inline_attr.is_none() {
2150 if let Res::Def(DefKind::Mod, did) = path.res {
2151 if !did.is_local() && did.is_crate_root() {
2152 // if we're `pub use`ing an extern crate root, don't inline it unless we
2153 // were specifically asked for it
2159 let mut visited = FxHashSet::default();
2160 let import_def_id = import.def_id.to_def_id();
2162 if let Some(mut items) = inline::try_inline(
2164 cx.tcx.parent_module(import.hir_id()).to_def_id(),
2165 Some(import_def_id),
2171 items.push(Item::from_def_id_and_parts(
2174 ImportItem(Import::new_simple(name, resolve_use_source(cx, path), false)),
2180 Import::new_simple(name, resolve_use_source(cx, path), true)
2183 vec![Item::from_def_id_and_parts(import.def_id.to_def_id(), None, ImportItem(inner), cx)]
2186 fn clean_maybe_renamed_foreign_item<'tcx>(
2187 cx: &mut DocContext<'tcx>,
2188 item: &hir::ForeignItem<'tcx>,
2189 renamed: Option<Symbol>,
2191 let def_id = item.def_id.to_def_id();
2192 cx.with_param_env(def_id, |cx| {
2193 let kind = match item.kind {
2194 hir::ForeignItemKind::Fn(decl, names, generics) => {
2195 let (generics, decl) = enter_impl_trait(cx, |cx| {
2196 // NOTE: generics must be cleaned before args
2197 let generics = generics.clean(cx);
2198 let args = clean_args_from_types_and_names(cx, decl.inputs, names);
2199 let decl = clean_fn_decl_with_args(cx, decl, args);
2202 ForeignFunctionItem(Function { decl, generics })
2204 hir::ForeignItemKind::Static(ty, mutability) => {
2205 ForeignStaticItem(Static { type_: ty.clean(cx), mutability, expr: None })
2207 hir::ForeignItemKind::Type => ForeignTypeItem,
2210 Item::from_hir_id_and_parts(
2212 Some(renamed.unwrap_or(item.ident.name)),
2219 impl<'tcx> Clean<'tcx, TypeBinding> for hir::TypeBinding<'tcx> {
2220 fn clean(&self, cx: &mut DocContext<'tcx>) -> TypeBinding {
2222 assoc: PathSegment { name: self.ident.name, args: self.gen_args.clean(cx) },
2223 kind: self.kind.clean(cx),
2228 impl<'tcx> Clean<'tcx, TypeBindingKind> for hir::TypeBindingKind<'tcx> {
2229 fn clean(&self, cx: &mut DocContext<'tcx>) -> TypeBindingKind {
2231 hir::TypeBindingKind::Equality { ref term } => {
2232 TypeBindingKind::Equality { term: term.clean(cx) }
2234 hir::TypeBindingKind::Constraint { bounds } => TypeBindingKind::Constraint {
2235 bounds: bounds.iter().filter_map(|b| b.clean(cx)).collect(),