1 //! This module contains implements of the `Lift` and `TypeFoldable`
2 //! traits for various types in the Rust compiler. Most are written by
3 //! hand, though we've recently added some macros and proc-macros to help with the tedium.
5 use crate::mir::interpret;
6 use crate::mir::ProjectionKind;
7 use crate::ty::fold::{TypeFoldable, TypeFolder, TypeVisitor};
8 use crate::ty::print::{with_no_trimmed_paths, FmtPrinter, Printer};
9 use crate::ty::{self, InferConst, Lift, Ty, TyCtxt};
10 use rustc_data_structures::functor::IdFunctor;
11 use rustc_hir::def::Namespace;
12 use rustc_hir::def_id::CRATE_DEF_INDEX;
13 use rustc_index::vec::{Idx, IndexVec};
16 use std::ops::ControlFlow;
20 impl fmt::Debug for ty::TraitDef {
21 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
23 with_no_trimmed_paths(|| {
24 FmtPrinter::new(tcx, f, Namespace::TypeNS).print_def_path(self.def_id, &[])
31 impl fmt::Debug for ty::AdtDef {
32 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
34 with_no_trimmed_paths(|| {
35 FmtPrinter::new(tcx, f, Namespace::TypeNS).print_def_path(self.did, &[])
42 impl fmt::Debug for ty::UpvarId {
43 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
44 let name = ty::tls::with(|tcx| tcx.hir().name(self.var_path.hir_id));
45 write!(f, "UpvarId({:?};`{}`;{:?})", self.var_path.hir_id, name, self.closure_expr_id)
49 impl fmt::Debug for ty::UpvarBorrow<'tcx> {
50 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
51 write!(f, "UpvarBorrow({:?}, {:?})", self.kind, self.region)
55 impl fmt::Debug for ty::ExistentialTraitRef<'tcx> {
56 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
57 with_no_trimmed_paths(|| fmt::Display::fmt(self, f))
61 impl fmt::Debug for ty::adjustment::Adjustment<'tcx> {
62 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
63 write!(f, "{:?} -> {}", self.kind, self.target)
67 impl fmt::Debug for ty::BoundRegionKind {
68 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
70 ty::BrAnon(n) => write!(f, "BrAnon({:?})", n),
71 ty::BrNamed(did, name) => {
72 if did.index == CRATE_DEF_INDEX {
73 write!(f, "BrNamed({})", name)
75 write!(f, "BrNamed({:?}, {})", did, name)
78 ty::BrEnv => write!(f, "BrEnv"),
83 impl fmt::Debug for ty::RegionKind {
84 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
86 ty::ReEarlyBound(ref data) => write!(f, "ReEarlyBound({}, {})", data.index, data.name),
88 ty::ReLateBound(binder_id, ref bound_region) => {
89 write!(f, "ReLateBound({:?}, {:?})", binder_id, bound_region)
92 ty::ReFree(ref fr) => fr.fmt(f),
94 ty::ReStatic => write!(f, "ReStatic"),
96 ty::ReVar(ref vid) => vid.fmt(f),
98 ty::RePlaceholder(placeholder) => write!(f, "RePlaceholder({:?})", placeholder),
100 ty::ReEmpty(ui) => write!(f, "ReEmpty({:?})", ui),
102 ty::ReErased => write!(f, "ReErased"),
107 impl fmt::Debug for ty::FreeRegion {
108 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
109 write!(f, "ReFree({:?}, {:?})", self.scope, self.bound_region)
113 impl fmt::Debug for ty::FnSig<'tcx> {
114 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
115 write!(f, "({:?}; c_variadic: {})->{:?}", self.inputs(), self.c_variadic, self.output())
119 impl<'tcx> fmt::Debug for ty::ConstVid<'tcx> {
120 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
121 write!(f, "_#{}c", self.index)
125 impl fmt::Debug for ty::RegionVid {
126 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
127 write!(f, "'_#{}r", self.index())
131 impl fmt::Debug for ty::TraitRef<'tcx> {
132 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
133 with_no_trimmed_paths(|| fmt::Display::fmt(self, f))
137 impl fmt::Debug for Ty<'tcx> {
138 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
139 with_no_trimmed_paths(|| fmt::Display::fmt(self, f))
143 impl fmt::Debug for ty::ParamTy {
144 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
145 write!(f, "{}/#{}", self.name, self.index)
149 impl fmt::Debug for ty::ParamConst {
150 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
151 write!(f, "{}/#{}", self.name, self.index)
155 impl fmt::Debug for ty::TraitPredicate<'tcx> {
156 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
157 if let ty::BoundConstness::ConstIfConst = self.constness {
158 write!(f, "~const ")?;
160 write!(f, "TraitPredicate({:?}, polarity:{:?})", self.trait_ref, self.polarity)
164 impl fmt::Debug for ty::ProjectionPredicate<'tcx> {
165 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
166 write!(f, "ProjectionPredicate({:?}, {:?})", self.projection_ty, self.ty)
170 impl fmt::Debug for ty::Predicate<'tcx> {
171 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
172 write!(f, "{:?}", self.kind())
176 impl fmt::Debug for ty::PredicateKind<'tcx> {
177 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
179 ty::PredicateKind::Trait(ref a) => a.fmt(f),
180 ty::PredicateKind::Subtype(ref pair) => pair.fmt(f),
181 ty::PredicateKind::Coerce(ref pair) => pair.fmt(f),
182 ty::PredicateKind::RegionOutlives(ref pair) => pair.fmt(f),
183 ty::PredicateKind::TypeOutlives(ref pair) => pair.fmt(f),
184 ty::PredicateKind::Projection(ref pair) => pair.fmt(f),
185 ty::PredicateKind::WellFormed(data) => write!(f, "WellFormed({:?})", data),
186 ty::PredicateKind::ObjectSafe(trait_def_id) => {
187 write!(f, "ObjectSafe({:?})", trait_def_id)
189 ty::PredicateKind::ClosureKind(closure_def_id, closure_substs, kind) => {
190 write!(f, "ClosureKind({:?}, {:?}, {:?})", closure_def_id, closure_substs, kind)
192 ty::PredicateKind::ConstEvaluatable(uv) => {
193 write!(f, "ConstEvaluatable({:?}, {:?})", uv.def, uv.substs_)
195 ty::PredicateKind::ConstEquate(c1, c2) => write!(f, "ConstEquate({:?}, {:?})", c1, c2),
196 ty::PredicateKind::TypeWellFormedFromEnv(ty) => {
197 write!(f, "TypeWellFormedFromEnv({:?})", ty)
203 ///////////////////////////////////////////////////////////////////////////
206 // For things that don't carry any arena-allocated data (and are
207 // copy...), just add them to this list.
209 TrivialTypeFoldableAndLiftImpls! {
213 ::rustc_target::abi::VariantIdx,
217 crate::middle::region::Scope,
219 ::rustc_ast::InlineAsmOptions,
220 ::rustc_ast::InlineAsmTemplatePiece,
222 ::rustc_span::symbol::Symbol,
223 ::rustc_hir::def::Res,
224 ::rustc_hir::def_id::DefId,
225 ::rustc_hir::def_id::LocalDefId,
227 ::rustc_hir::LlvmInlineAsmInner,
228 ::rustc_hir::MatchSource,
229 ::rustc_hir::Mutability,
230 ::rustc_hir::Unsafety,
231 ::rustc_target::asm::InlineAsmRegOrRegClass,
232 ::rustc_target::spec::abi::Abi,
233 crate::mir::coverage::ExpressionOperandId,
234 crate::mir::coverage::CounterValueReference,
235 crate::mir::coverage::InjectedExpressionId,
236 crate::mir::coverage::InjectedExpressionIndex,
237 crate::mir::coverage::MappedExpressionIndex,
239 crate::mir::Promoted,
240 crate::traits::Reveal,
241 crate::ty::adjustment::AutoBorrowMutability,
243 crate::ty::BoundConstness,
244 // Including `BoundRegionKind` is a *bit* dubious, but direct
245 // references to bound region appear in `ty::Error`, and aren't
246 // really meant to be folded. In general, we can only fold a fully
248 crate::ty::BoundRegionKind,
249 crate::ty::AssocItem,
250 crate::ty::Placeholder<crate::ty::BoundRegionKind>,
251 crate::ty::ClosureKind,
252 crate::ty::FreeRegion,
254 crate::ty::IntVarValue,
255 crate::ty::ParamConst,
257 crate::ty::adjustment::PointerCast,
258 crate::ty::RegionVid,
259 crate::ty::UniverseIndex,
264 ///////////////////////////////////////////////////////////////////////////
265 // Lift implementations
267 // FIXME(eddyb) replace all the uses of `Option::map` with `?`.
268 impl<'tcx, A: Lift<'tcx>, B: Lift<'tcx>> Lift<'tcx> for (A, B) {
269 type Lifted = (A::Lifted, B::Lifted);
270 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
271 Some((tcx.lift(self.0)?, tcx.lift(self.1)?))
275 impl<'tcx, A: Lift<'tcx>, B: Lift<'tcx>, C: Lift<'tcx>> Lift<'tcx> for (A, B, C) {
276 type Lifted = (A::Lifted, B::Lifted, C::Lifted);
277 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
278 Some((tcx.lift(self.0)?, tcx.lift(self.1)?, tcx.lift(self.2)?))
282 impl<'tcx, T: Lift<'tcx>> Lift<'tcx> for Option<T> {
283 type Lifted = Option<T::Lifted>;
284 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
286 Some(x) => tcx.lift(x).map(Some),
292 impl<'tcx, T: Lift<'tcx>, E: Lift<'tcx>> Lift<'tcx> for Result<T, E> {
293 type Lifted = Result<T::Lifted, E::Lifted>;
294 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
296 Ok(x) => tcx.lift(x).map(Ok),
297 Err(e) => tcx.lift(e).map(Err),
302 impl<'tcx, T: Lift<'tcx>> Lift<'tcx> for Box<T> {
303 type Lifted = Box<T::Lifted>;
304 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
305 tcx.lift(*self).map(Box::new)
309 impl<'tcx, T: Lift<'tcx> + Clone> Lift<'tcx> for Rc<T> {
310 type Lifted = Rc<T::Lifted>;
311 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
312 tcx.lift(self.as_ref().clone()).map(Rc::new)
316 impl<'tcx, T: Lift<'tcx> + Clone> Lift<'tcx> for Arc<T> {
317 type Lifted = Arc<T::Lifted>;
318 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
319 tcx.lift(self.as_ref().clone()).map(Arc::new)
322 impl<'tcx, T: Lift<'tcx>> Lift<'tcx> for Vec<T> {
323 type Lifted = Vec<T::Lifted>;
324 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
325 self.into_iter().map(|v| tcx.lift(v)).collect()
329 impl<'tcx, I: Idx, T: Lift<'tcx>> Lift<'tcx> for IndexVec<I, T> {
330 type Lifted = IndexVec<I, T::Lifted>;
331 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
332 self.into_iter().map(|e| tcx.lift(e)).collect()
336 impl<'a, 'tcx> Lift<'tcx> for ty::TraitRef<'a> {
337 type Lifted = ty::TraitRef<'tcx>;
338 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
339 tcx.lift(self.substs).map(|substs| ty::TraitRef { def_id: self.def_id, substs })
343 impl<'a, 'tcx> Lift<'tcx> for ty::ExistentialTraitRef<'a> {
344 type Lifted = ty::ExistentialTraitRef<'tcx>;
345 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
346 tcx.lift(self.substs).map(|substs| ty::ExistentialTraitRef { def_id: self.def_id, substs })
350 impl<'a, 'tcx> Lift<'tcx> for ty::ExistentialPredicate<'a> {
351 type Lifted = ty::ExistentialPredicate<'tcx>;
352 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
354 ty::ExistentialPredicate::Trait(x) => tcx.lift(x).map(ty::ExistentialPredicate::Trait),
355 ty::ExistentialPredicate::Projection(x) => {
356 tcx.lift(x).map(ty::ExistentialPredicate::Projection)
358 ty::ExistentialPredicate::AutoTrait(def_id) => {
359 Some(ty::ExistentialPredicate::AutoTrait(def_id))
365 impl<'a, 'tcx> Lift<'tcx> for ty::TraitPredicate<'a> {
366 type Lifted = ty::TraitPredicate<'tcx>;
367 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<ty::TraitPredicate<'tcx>> {
368 tcx.lift(self.trait_ref).map(|trait_ref| ty::TraitPredicate {
370 constness: self.constness,
371 polarity: self.polarity,
376 impl<'a, 'tcx> Lift<'tcx> for ty::SubtypePredicate<'a> {
377 type Lifted = ty::SubtypePredicate<'tcx>;
378 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<ty::SubtypePredicate<'tcx>> {
379 tcx.lift((self.a, self.b)).map(|(a, b)| ty::SubtypePredicate {
380 a_is_expected: self.a_is_expected,
387 impl<'a, 'tcx> Lift<'tcx> for ty::CoercePredicate<'a> {
388 type Lifted = ty::CoercePredicate<'tcx>;
389 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<ty::CoercePredicate<'tcx>> {
390 tcx.lift((self.a, self.b)).map(|(a, b)| ty::CoercePredicate { a, b })
394 impl<'tcx, A: Copy + Lift<'tcx>, B: Copy + Lift<'tcx>> Lift<'tcx> for ty::OutlivesPredicate<A, B> {
395 type Lifted = ty::OutlivesPredicate<A::Lifted, B::Lifted>;
396 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
397 tcx.lift((self.0, self.1)).map(|(a, b)| ty::OutlivesPredicate(a, b))
401 impl<'a, 'tcx> Lift<'tcx> for ty::ProjectionTy<'a> {
402 type Lifted = ty::ProjectionTy<'tcx>;
403 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<ty::ProjectionTy<'tcx>> {
404 tcx.lift(self.substs)
405 .map(|substs| ty::ProjectionTy { item_def_id: self.item_def_id, substs })
409 impl<'a, 'tcx> Lift<'tcx> for ty::ProjectionPredicate<'a> {
410 type Lifted = ty::ProjectionPredicate<'tcx>;
411 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<ty::ProjectionPredicate<'tcx>> {
412 tcx.lift((self.projection_ty, self.ty))
413 .map(|(projection_ty, ty)| ty::ProjectionPredicate { projection_ty, ty })
417 impl<'a, 'tcx> Lift<'tcx> for ty::ExistentialProjection<'a> {
418 type Lifted = ty::ExistentialProjection<'tcx>;
419 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
420 tcx.lift(self.substs).map(|substs| ty::ExistentialProjection {
422 ty: tcx.lift(self.ty).expect("type must lift when substs do"),
423 item_def_id: self.item_def_id,
428 impl<'a, 'tcx> Lift<'tcx> for ty::PredicateKind<'a> {
429 type Lifted = ty::PredicateKind<'tcx>;
430 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
432 ty::PredicateKind::Trait(data) => tcx.lift(data).map(ty::PredicateKind::Trait),
433 ty::PredicateKind::Subtype(data) => tcx.lift(data).map(ty::PredicateKind::Subtype),
434 ty::PredicateKind::Coerce(data) => tcx.lift(data).map(ty::PredicateKind::Coerce),
435 ty::PredicateKind::RegionOutlives(data) => {
436 tcx.lift(data).map(ty::PredicateKind::RegionOutlives)
438 ty::PredicateKind::TypeOutlives(data) => {
439 tcx.lift(data).map(ty::PredicateKind::TypeOutlives)
441 ty::PredicateKind::Projection(data) => {
442 tcx.lift(data).map(ty::PredicateKind::Projection)
444 ty::PredicateKind::WellFormed(ty) => tcx.lift(ty).map(ty::PredicateKind::WellFormed),
445 ty::PredicateKind::ClosureKind(closure_def_id, closure_substs, kind) => {
446 tcx.lift(closure_substs).map(|closure_substs| {
447 ty::PredicateKind::ClosureKind(closure_def_id, closure_substs, kind)
450 ty::PredicateKind::ObjectSafe(trait_def_id) => {
451 Some(ty::PredicateKind::ObjectSafe(trait_def_id))
453 ty::PredicateKind::ConstEvaluatable(uv) => {
454 tcx.lift(uv).map(|uv| ty::PredicateKind::ConstEvaluatable(uv))
456 ty::PredicateKind::ConstEquate(c1, c2) => {
457 tcx.lift((c1, c2)).map(|(c1, c2)| ty::PredicateKind::ConstEquate(c1, c2))
459 ty::PredicateKind::TypeWellFormedFromEnv(ty) => {
460 tcx.lift(ty).map(ty::PredicateKind::TypeWellFormedFromEnv)
466 impl<'a, 'tcx, T: Lift<'tcx>> Lift<'tcx> for ty::Binder<'a, T>
468 <T as Lift<'tcx>>::Lifted: TypeFoldable<'tcx>,
470 type Lifted = ty::Binder<'tcx, T::Lifted>;
471 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
472 let bound_vars = tcx.lift(self.bound_vars());
473 tcx.lift(self.skip_binder())
475 .map(|(value, vars)| ty::Binder::bind_with_vars(value, vars))
479 impl<'a, 'tcx> Lift<'tcx> for ty::ParamEnv<'a> {
480 type Lifted = ty::ParamEnv<'tcx>;
481 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
482 tcx.lift(self.caller_bounds())
483 .map(|caller_bounds| ty::ParamEnv::new(caller_bounds, self.reveal()))
487 impl<'a, 'tcx, T: Lift<'tcx>> Lift<'tcx> for ty::ParamEnvAnd<'a, T> {
488 type Lifted = ty::ParamEnvAnd<'tcx, T::Lifted>;
489 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
490 tcx.lift(self.param_env).and_then(|param_env| {
491 tcx.lift(self.value).map(|value| ty::ParamEnvAnd { param_env, value })
496 impl<'a, 'tcx> Lift<'tcx> for ty::ClosureSubsts<'a> {
497 type Lifted = ty::ClosureSubsts<'tcx>;
498 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
499 tcx.lift(self.substs).map(|substs| ty::ClosureSubsts { substs })
503 impl<'a, 'tcx> Lift<'tcx> for ty::GeneratorSubsts<'a> {
504 type Lifted = ty::GeneratorSubsts<'tcx>;
505 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
506 tcx.lift(self.substs).map(|substs| ty::GeneratorSubsts { substs })
510 impl<'a, 'tcx> Lift<'tcx> for ty::adjustment::Adjustment<'a> {
511 type Lifted = ty::adjustment::Adjustment<'tcx>;
512 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
513 let ty::adjustment::Adjustment { kind, target } = self;
514 tcx.lift(kind).and_then(|kind| {
515 tcx.lift(target).map(|target| ty::adjustment::Adjustment { kind, target })
520 impl<'a, 'tcx> Lift<'tcx> for ty::adjustment::Adjust<'a> {
521 type Lifted = ty::adjustment::Adjust<'tcx>;
522 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
524 ty::adjustment::Adjust::NeverToAny => Some(ty::adjustment::Adjust::NeverToAny),
525 ty::adjustment::Adjust::Pointer(ptr) => Some(ty::adjustment::Adjust::Pointer(ptr)),
526 ty::adjustment::Adjust::Deref(overloaded) => {
527 tcx.lift(overloaded).map(ty::adjustment::Adjust::Deref)
529 ty::adjustment::Adjust::Borrow(autoref) => {
530 tcx.lift(autoref).map(ty::adjustment::Adjust::Borrow)
536 impl<'a, 'tcx> Lift<'tcx> for ty::adjustment::OverloadedDeref<'a> {
537 type Lifted = ty::adjustment::OverloadedDeref<'tcx>;
538 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
539 tcx.lift(self.region).map(|region| ty::adjustment::OverloadedDeref {
547 impl<'a, 'tcx> Lift<'tcx> for ty::adjustment::AutoBorrow<'a> {
548 type Lifted = ty::adjustment::AutoBorrow<'tcx>;
549 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
551 ty::adjustment::AutoBorrow::Ref(r, m) => {
552 tcx.lift(r).map(|r| ty::adjustment::AutoBorrow::Ref(r, m))
554 ty::adjustment::AutoBorrow::RawPtr(m) => Some(ty::adjustment::AutoBorrow::RawPtr(m)),
559 impl<'a, 'tcx> Lift<'tcx> for ty::GenSig<'a> {
560 type Lifted = ty::GenSig<'tcx>;
561 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
562 tcx.lift((self.resume_ty, self.yield_ty, self.return_ty))
563 .map(|(resume_ty, yield_ty, return_ty)| ty::GenSig { resume_ty, yield_ty, return_ty })
567 impl<'a, 'tcx> Lift<'tcx> for ty::FnSig<'a> {
568 type Lifted = ty::FnSig<'tcx>;
569 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
570 tcx.lift(self.inputs_and_output).map(|x| ty::FnSig {
571 inputs_and_output: x,
572 c_variadic: self.c_variadic,
573 unsafety: self.unsafety,
579 impl<'tcx, T: Lift<'tcx>> Lift<'tcx> for ty::error::ExpectedFound<T> {
580 type Lifted = ty::error::ExpectedFound<T::Lifted>;
581 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
582 let ty::error::ExpectedFound { expected, found } = self;
583 tcx.lift(expected).and_then(|expected| {
584 tcx.lift(found).map(|found| ty::error::ExpectedFound { expected, found })
589 impl<'a, 'tcx> Lift<'tcx> for ty::error::TypeError<'a> {
590 type Lifted = ty::error::TypeError<'tcx>;
591 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
592 use crate::ty::error::TypeError::*;
595 Mismatch => Mismatch,
596 ConstnessMismatch(x) => ConstnessMismatch(x),
597 PolarityMismatch(x) => PolarityMismatch(x),
598 UnsafetyMismatch(x) => UnsafetyMismatch(x),
599 AbiMismatch(x) => AbiMismatch(x),
600 Mutability => Mutability,
601 ArgumentMutability(i) => ArgumentMutability(i),
602 TupleSize(x) => TupleSize(x),
603 FixedArraySize(x) => FixedArraySize(x),
604 ArgCount => ArgCount,
605 RegionsDoesNotOutlive(a, b) => {
606 return tcx.lift((a, b)).map(|(a, b)| RegionsDoesNotOutlive(a, b));
608 RegionsInsufficientlyPolymorphic(a, b) => {
609 return tcx.lift(b).map(|b| RegionsInsufficientlyPolymorphic(a, b));
611 RegionsOverlyPolymorphic(a, b) => {
612 return tcx.lift(b).map(|b| RegionsOverlyPolymorphic(a, b));
614 RegionsPlaceholderMismatch => RegionsPlaceholderMismatch,
615 IntMismatch(x) => IntMismatch(x),
616 FloatMismatch(x) => FloatMismatch(x),
617 Traits(x) => Traits(x),
618 VariadicMismatch(x) => VariadicMismatch(x),
619 CyclicTy(t) => return tcx.lift(t).map(|t| CyclicTy(t)),
620 CyclicConst(ct) => return tcx.lift(ct).map(|ct| CyclicConst(ct)),
621 ProjectionMismatched(x) => ProjectionMismatched(x),
622 ArgumentSorts(x, i) => return tcx.lift(x).map(|x| ArgumentSorts(x, i)),
623 Sorts(x) => return tcx.lift(x).map(Sorts),
624 ExistentialMismatch(x) => return tcx.lift(x).map(ExistentialMismatch),
625 ConstMismatch(x) => return tcx.lift(x).map(ConstMismatch),
626 IntrinsicCast => IntrinsicCast,
627 TargetFeatureCast(x) => TargetFeatureCast(x),
628 ObjectUnsafeCoercion(x) => return tcx.lift(x).map(ObjectUnsafeCoercion),
633 impl<'a, 'tcx> Lift<'tcx> for ty::InstanceDef<'a> {
634 type Lifted = ty::InstanceDef<'tcx>;
635 fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
637 ty::InstanceDef::Item(def_id) => Some(ty::InstanceDef::Item(def_id)),
638 ty::InstanceDef::VtableShim(def_id) => Some(ty::InstanceDef::VtableShim(def_id)),
639 ty::InstanceDef::ReifyShim(def_id) => Some(ty::InstanceDef::ReifyShim(def_id)),
640 ty::InstanceDef::Intrinsic(def_id) => Some(ty::InstanceDef::Intrinsic(def_id)),
641 ty::InstanceDef::FnPtrShim(def_id, ty) => {
642 Some(ty::InstanceDef::FnPtrShim(def_id, tcx.lift(ty)?))
644 ty::InstanceDef::Virtual(def_id, n) => Some(ty::InstanceDef::Virtual(def_id, n)),
645 ty::InstanceDef::ClosureOnceShim { call_once, track_caller } => {
646 Some(ty::InstanceDef::ClosureOnceShim { call_once, track_caller })
648 ty::InstanceDef::DropGlue(def_id, ty) => {
649 Some(ty::InstanceDef::DropGlue(def_id, tcx.lift(ty)?))
651 ty::InstanceDef::CloneShim(def_id, ty) => {
652 Some(ty::InstanceDef::CloneShim(def_id, tcx.lift(ty)?))
658 ///////////////////////////////////////////////////////////////////////////
659 // TypeFoldable implementations.
661 // Ideally, each type should invoke `folder.fold_foo(self)` and
662 // nothing else. In some cases, though, we haven't gotten around to
663 // adding methods on the `folder` yet, and thus the folding is
664 // hard-coded here. This is less-flexible, because folders cannot
665 // override the behavior, but there are a lot of random types and one
666 // can easily refactor the folding into the TypeFolder trait as
669 /// AdtDefs are basically the same as a DefId.
670 impl<'tcx> TypeFoldable<'tcx> for &'tcx ty::AdtDef {
671 fn super_fold_with<F: TypeFolder<'tcx>>(self, _folder: &mut F) -> Self {
675 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, _visitor: &mut V) -> ControlFlow<V::BreakTy> {
676 ControlFlow::CONTINUE
680 impl<'tcx, T: TypeFoldable<'tcx>, U: TypeFoldable<'tcx>> TypeFoldable<'tcx> for (T, U) {
681 fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> (T, U) {
682 (self.0.fold_with(folder), self.1.fold_with(folder))
685 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
686 self.0.visit_with(visitor)?;
687 self.1.visit_with(visitor)
691 impl<'tcx, A: TypeFoldable<'tcx>, B: TypeFoldable<'tcx>, C: TypeFoldable<'tcx>> TypeFoldable<'tcx>
694 fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> (A, B, C) {
695 (self.0.fold_with(folder), self.1.fold_with(folder), self.2.fold_with(folder))
698 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
699 self.0.visit_with(visitor)?;
700 self.1.visit_with(visitor)?;
701 self.2.visit_with(visitor)
705 EnumTypeFoldableImpl! {
706 impl<'tcx, T> TypeFoldable<'tcx> for Option<T> {
709 } where T: TypeFoldable<'tcx>
712 EnumTypeFoldableImpl! {
713 impl<'tcx, T, E> TypeFoldable<'tcx> for Result<T, E> {
716 } where T: TypeFoldable<'tcx>, E: TypeFoldable<'tcx>,
719 impl<'tcx, T: TypeFoldable<'tcx>> TypeFoldable<'tcx> for Rc<T> {
720 fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
721 // FIXME: Reuse the `Rc` here.
722 Rc::new((*self).clone().fold_with(folder))
725 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
726 (**self).visit_with(visitor)
730 impl<'tcx, T: TypeFoldable<'tcx>> TypeFoldable<'tcx> for Arc<T> {
731 fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
732 // FIXME: Reuse the `Arc` here.
733 Arc::new((*self).clone().fold_with(folder))
736 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
737 (**self).visit_with(visitor)
741 impl<'tcx, T: TypeFoldable<'tcx>> TypeFoldable<'tcx> for Box<T> {
742 fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
743 self.map_id(|value| value.fold_with(folder))
746 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
747 (**self).visit_with(visitor)
751 impl<'tcx, T: TypeFoldable<'tcx>> TypeFoldable<'tcx> for Vec<T> {
752 fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
753 self.map_id(|t| t.fold_with(folder))
756 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
757 self.iter().try_for_each(|t| t.visit_with(visitor))
761 impl<'tcx, T: TypeFoldable<'tcx>> TypeFoldable<'tcx> for Box<[T]> {
762 fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
763 self.map_id(|t| t.fold_with(folder))
766 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
767 self.iter().try_for_each(|t| t.visit_with(visitor))
771 impl<'tcx, T: TypeFoldable<'tcx>> TypeFoldable<'tcx> for ty::Binder<'tcx, T> {
772 fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
773 self.map_bound(|ty| ty.fold_with(folder))
776 fn fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
777 folder.fold_binder(self)
780 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
781 self.as_ref().skip_binder().visit_with(visitor)
784 fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
785 visitor.visit_binder(self)
789 impl<'tcx> TypeFoldable<'tcx> for &'tcx ty::List<ty::Binder<'tcx, ty::ExistentialPredicate<'tcx>>> {
790 fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
791 ty::util::fold_list(self, folder, |tcx, v| tcx.intern_poly_existential_predicates(v))
794 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
795 self.iter().try_for_each(|p| p.visit_with(visitor))
799 impl<'tcx> TypeFoldable<'tcx> for &'tcx ty::List<Ty<'tcx>> {
800 fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
801 ty::util::fold_list(self, folder, |tcx, v| tcx.intern_type_list(v))
804 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
805 self.iter().try_for_each(|t| t.visit_with(visitor))
809 impl<'tcx> TypeFoldable<'tcx> for &'tcx ty::List<ProjectionKind> {
810 fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
811 ty::util::fold_list(self, folder, |tcx, v| tcx.intern_projs(v))
814 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
815 self.iter().try_for_each(|t| t.visit_with(visitor))
819 impl<'tcx> TypeFoldable<'tcx> for ty::instance::Instance<'tcx> {
820 fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
821 use crate::ty::InstanceDef::*;
823 substs: self.substs.fold_with(folder),
824 def: match self.def {
825 Item(def) => Item(def.fold_with(folder)),
826 VtableShim(did) => VtableShim(did.fold_with(folder)),
827 ReifyShim(did) => ReifyShim(did.fold_with(folder)),
828 Intrinsic(did) => Intrinsic(did.fold_with(folder)),
829 FnPtrShim(did, ty) => FnPtrShim(did.fold_with(folder), ty.fold_with(folder)),
830 Virtual(did, i) => Virtual(did.fold_with(folder), i),
831 ClosureOnceShim { call_once, track_caller } => {
832 ClosureOnceShim { call_once: call_once.fold_with(folder), track_caller }
834 DropGlue(did, ty) => DropGlue(did.fold_with(folder), ty.fold_with(folder)),
835 CloneShim(did, ty) => CloneShim(did.fold_with(folder), ty.fold_with(folder)),
840 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
841 use crate::ty::InstanceDef::*;
842 self.substs.visit_with(visitor)?;
844 Item(def) => def.visit_with(visitor),
845 VtableShim(did) | ReifyShim(did) | Intrinsic(did) | Virtual(did, _) => {
846 did.visit_with(visitor)
848 FnPtrShim(did, ty) | CloneShim(did, ty) => {
849 did.visit_with(visitor)?;
850 ty.visit_with(visitor)
852 DropGlue(did, ty) => {
853 did.visit_with(visitor)?;
854 ty.visit_with(visitor)
856 ClosureOnceShim { call_once, track_caller: _ } => call_once.visit_with(visitor),
861 impl<'tcx> TypeFoldable<'tcx> for interpret::GlobalId<'tcx> {
862 fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
863 Self { instance: self.instance.fold_with(folder), promoted: self.promoted }
866 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
867 self.instance.visit_with(visitor)
871 impl<'tcx> TypeFoldable<'tcx> for Ty<'tcx> {
872 fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
873 let kind = match *self.kind() {
874 ty::RawPtr(tm) => ty::RawPtr(tm.fold_with(folder)),
875 ty::Array(typ, sz) => ty::Array(typ.fold_with(folder), sz.fold_with(folder)),
876 ty::Slice(typ) => ty::Slice(typ.fold_with(folder)),
877 ty::Adt(tid, substs) => ty::Adt(tid, substs.fold_with(folder)),
878 ty::Dynamic(trait_ty, region) => {
879 ty::Dynamic(trait_ty.fold_with(folder), region.fold_with(folder))
881 ty::Tuple(ts) => ty::Tuple(ts.fold_with(folder)),
882 ty::FnDef(def_id, substs) => ty::FnDef(def_id, substs.fold_with(folder)),
883 ty::FnPtr(f) => ty::FnPtr(f.fold_with(folder)),
884 ty::Ref(r, ty, mutbl) => ty::Ref(r.fold_with(folder), ty.fold_with(folder), mutbl),
885 ty::Generator(did, substs, movability) => {
886 ty::Generator(did, substs.fold_with(folder), movability)
888 ty::GeneratorWitness(types) => ty::GeneratorWitness(types.fold_with(folder)),
889 ty::Closure(did, substs) => ty::Closure(did, substs.fold_with(folder)),
890 ty::Projection(data) => ty::Projection(data.fold_with(folder)),
891 ty::Opaque(did, substs) => ty::Opaque(did, substs.fold_with(folder)),
903 | ty::Placeholder(..)
905 | ty::Foreign(..) => return self,
908 if *self.kind() == kind { self } else { folder.tcx().mk_ty(kind) }
911 fn fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
915 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
917 ty::RawPtr(ref tm) => tm.visit_with(visitor),
918 ty::Array(typ, sz) => {
919 typ.visit_with(visitor)?;
920 sz.visit_with(visitor)
922 ty::Slice(typ) => typ.visit_with(visitor),
923 ty::Adt(_, substs) => substs.visit_with(visitor),
924 ty::Dynamic(ref trait_ty, ref reg) => {
925 trait_ty.visit_with(visitor)?;
926 reg.visit_with(visitor)
928 ty::Tuple(ts) => ts.visit_with(visitor),
929 ty::FnDef(_, substs) => substs.visit_with(visitor),
930 ty::FnPtr(ref f) => f.visit_with(visitor),
931 ty::Ref(r, ty, _) => {
932 r.visit_with(visitor)?;
933 ty.visit_with(visitor)
935 ty::Generator(_did, ref substs, _) => substs.visit_with(visitor),
936 ty::GeneratorWitness(ref types) => types.visit_with(visitor),
937 ty::Closure(_did, ref substs) => substs.visit_with(visitor),
938 ty::Projection(ref data) => data.visit_with(visitor),
939 ty::Opaque(_, ref substs) => substs.visit_with(visitor),
950 | ty::Placeholder(..)
953 | ty::Foreign(..) => ControlFlow::CONTINUE,
957 fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
958 visitor.visit_ty(self)
962 impl<'tcx> TypeFoldable<'tcx> for ty::Region<'tcx> {
963 fn super_fold_with<F: TypeFolder<'tcx>>(self, _folder: &mut F) -> Self {
967 fn fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
968 folder.fold_region(self)
971 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, _visitor: &mut V) -> ControlFlow<V::BreakTy> {
972 ControlFlow::CONTINUE
975 fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
976 visitor.visit_region(*self)
980 impl<'tcx> TypeFoldable<'tcx> for ty::Predicate<'tcx> {
981 fn fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
982 folder.fold_predicate(self)
985 fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
986 let new = self.inner.kind.fold_with(folder);
987 folder.tcx().reuse_or_mk_predicate(self, new)
990 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
991 self.inner.kind.visit_with(visitor)
994 fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
995 visitor.visit_predicate(*self)
998 fn has_vars_bound_at_or_above(&self, binder: ty::DebruijnIndex) -> bool {
999 self.inner.outer_exclusive_binder > binder
1002 fn has_type_flags(&self, flags: ty::TypeFlags) -> bool {
1003 self.inner.flags.intersects(flags)
1007 impl<'tcx> TypeFoldable<'tcx> for &'tcx ty::List<ty::Predicate<'tcx>> {
1008 fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
1009 ty::util::fold_list(self, folder, |tcx, v| tcx.intern_predicates(v))
1012 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
1013 self.iter().try_for_each(|p| p.visit_with(visitor))
1017 impl<'tcx, T: TypeFoldable<'tcx>, I: Idx> TypeFoldable<'tcx> for IndexVec<I, T> {
1018 fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
1019 self.map_id(|x| x.fold_with(folder))
1022 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
1023 self.iter().try_for_each(|t| t.visit_with(visitor))
1027 impl<'tcx> TypeFoldable<'tcx> for &'tcx ty::Const<'tcx> {
1028 fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
1029 let ty = self.ty.fold_with(folder);
1030 let val = self.val.fold_with(folder);
1031 if ty != self.ty || val != self.val {
1032 folder.tcx().mk_const(ty::Const { ty, val })
1038 fn fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
1039 folder.fold_const(self)
1042 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
1043 self.ty.visit_with(visitor)?;
1044 self.val.visit_with(visitor)
1047 fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
1048 visitor.visit_const(self)
1052 impl<'tcx> TypeFoldable<'tcx> for ty::ConstKind<'tcx> {
1053 fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
1055 ty::ConstKind::Infer(ic) => ty::ConstKind::Infer(ic.fold_with(folder)),
1056 ty::ConstKind::Param(p) => ty::ConstKind::Param(p.fold_with(folder)),
1057 ty::ConstKind::Unevaluated(uv) => ty::ConstKind::Unevaluated(uv.fold_with(folder)),
1058 ty::ConstKind::Value(_)
1059 | ty::ConstKind::Bound(..)
1060 | ty::ConstKind::Placeholder(..)
1061 | ty::ConstKind::Error(_) => self,
1065 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
1067 ty::ConstKind::Infer(ic) => ic.visit_with(visitor),
1068 ty::ConstKind::Param(p) => p.visit_with(visitor),
1069 ty::ConstKind::Unevaluated(uv) => uv.visit_with(visitor),
1070 ty::ConstKind::Value(_)
1071 | ty::ConstKind::Bound(..)
1072 | ty::ConstKind::Placeholder(_)
1073 | ty::ConstKind::Error(_) => ControlFlow::CONTINUE,
1078 impl<'tcx> TypeFoldable<'tcx> for InferConst<'tcx> {
1079 fn super_fold_with<F: TypeFolder<'tcx>>(self, _folder: &mut F) -> Self {
1083 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, _visitor: &mut V) -> ControlFlow<V::BreakTy> {
1084 ControlFlow::CONTINUE
1088 impl<'tcx> TypeFoldable<'tcx> for ty::Unevaluated<'tcx> {
1089 fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
1092 substs_: Some(self.substs(folder.tcx()).fold_with(folder)),
1093 promoted: self.promoted,
1097 fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
1098 visitor.visit_unevaluated_const(*self)
1101 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
1102 if let Some(tcx) = visitor.tcx_for_anon_const_substs() {
1103 self.substs(tcx).visit_with(visitor)
1104 } else if let Some(substs) = self.substs_ {
1105 substs.visit_with(visitor)
1107 debug!("ignoring default substs of `{:?}`", self.def);
1108 ControlFlow::CONTINUE
1113 impl<'tcx> TypeFoldable<'tcx> for ty::Unevaluated<'tcx, ()> {
1114 fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
1117 substs_: Some(self.substs(folder.tcx()).fold_with(folder)),
1118 promoted: self.promoted,
1122 fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
1123 visitor.visit_unevaluated_const(self.expand())
1126 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
1127 if let Some(tcx) = visitor.tcx_for_anon_const_substs() {
1128 self.substs(tcx).visit_with(visitor)
1129 } else if let Some(substs) = self.substs_ {
1130 substs.visit_with(visitor)
1132 debug!("ignoring default substs of `{:?}`", self.def);
1133 ControlFlow::CONTINUE