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 (e.g.,
4 //! `BraceStructLiftImpl!`) to help with the tedium.
6 use crate::hir::def::Namespace;
7 use crate::mir::ProjectionKind;
8 use crate::mir::interpret::ConstValue;
9 use crate::ty::{self, Lift, Ty, TyCtxt, ConstVid, InferConst};
10 use crate::ty::fold::{TypeFoldable, TypeFolder, TypeVisitor};
11 use crate::ty::print::{FmtPrinter, PrintCx, Printer};
12 use rustc_data_structures::indexed_vec::{IndexVec, Idx};
13 use smallvec::SmallVec;
14 use crate::mir::interpret;
18 use std::marker::PhantomData;
21 impl fmt::Debug for ty::GenericParamDef {
22 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
23 let type_name = match self.kind {
24 ty::GenericParamDefKind::Lifetime => "Lifetime",
25 ty::GenericParamDefKind::Type {..} => "Type",
26 ty::GenericParamDefKind::Const => "Const",
28 write!(f, "{}({}, {:?}, {})",
36 impl fmt::Debug for ty::TraitDef {
37 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
38 PrintCx::with_tls_tcx(FmtPrinter::new(f, Namespace::TypeNS), |cx| {
39 cx.print_def_path(self.def_id, None, iter::empty())?;
45 impl fmt::Debug for ty::AdtDef {
46 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
47 PrintCx::with_tls_tcx(FmtPrinter::new(f, Namespace::TypeNS), |cx| {
48 cx.print_def_path(self.did, None, iter::empty())?;
54 impl fmt::Debug for ty::ClosureUpvar<'tcx> {
55 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
56 write!(f, "ClosureUpvar({:?},{:?})",
62 impl fmt::Debug for ty::UpvarId {
63 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
64 let name = ty::tls::with(|tcx| {
65 tcx.hir().name_by_hir_id(self.var_path.hir_id)
67 write!(f, "UpvarId({:?};`{}`;{:?})",
74 impl fmt::Debug for ty::UpvarBorrow<'tcx> {
75 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
76 write!(f, "UpvarBorrow({:?}, {:?})",
77 self.kind, self.region)
81 impl fmt::Debug for ty::ExistentialTraitRef<'tcx> {
82 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
83 fmt::Display::fmt(self, f)
87 impl fmt::Debug for ty::adjustment::Adjustment<'tcx> {
88 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
89 write!(f, "{:?} -> {}", self.kind, self.target)
93 impl fmt::Debug for ty::BoundRegion {
94 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
96 ty::BrAnon(n) => write!(f, "BrAnon({:?})", n),
97 ty::BrFresh(n) => write!(f, "BrFresh({:?})", n),
98 ty::BrNamed(did, name) => {
99 write!(f, "BrNamed({:?}:{:?}, {})",
100 did.krate, did.index, name)
102 ty::BrEnv => write!(f, "BrEnv"),
107 impl fmt::Debug for ty::RegionKind {
108 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
110 ty::ReEarlyBound(ref data) => {
111 write!(f, "ReEarlyBound({}, {})",
116 ty::ReClosureBound(ref vid) => {
117 write!(f, "ReClosureBound({:?})", vid)
120 ty::ReLateBound(binder_id, ref bound_region) => {
121 write!(f, "ReLateBound({:?}, {:?})", binder_id, bound_region)
124 ty::ReFree(ref fr) => fr.fmt(f),
126 ty::ReScope(id) => write!(f, "ReScope({:?})", id),
128 ty::ReStatic => write!(f, "ReStatic"),
130 ty::ReVar(ref vid) => vid.fmt(f),
132 ty::RePlaceholder(placeholder) => {
133 write!(f, "RePlaceholder({:?})", placeholder)
136 ty::ReEmpty => write!(f, "ReEmpty"),
138 ty::ReErased => write!(f, "ReErased"),
143 impl fmt::Debug for ty::FreeRegion {
144 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
145 write!(f, "ReFree({:?}, {:?})", self.scope, self.bound_region)
149 impl fmt::Debug for ty::Variance {
150 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
151 f.write_str(match *self {
152 ty::Covariant => "+",
153 ty::Contravariant => "-",
154 ty::Invariant => "o",
155 ty::Bivariant => "*",
160 impl fmt::Debug for ty::FnSig<'tcx> {
161 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
162 write!(f, "({:?}; c_variadic: {})->{:?}",
163 self.inputs(), self.c_variadic, self.output())
167 impl fmt::Debug for ty::TyVid {
168 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
169 write!(f, "_#{}t", self.index)
173 impl<'tcx> fmt::Debug for ty::ConstVid<'tcx> {
174 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
175 write!(f, "_#{}c", self.index)
179 impl fmt::Debug for ty::IntVid {
180 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
181 write!(f, "_#{}i", self.index)
185 impl fmt::Debug for ty::FloatVid {
186 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
187 write!(f, "_#{}f", self.index)
191 impl fmt::Debug for ty::RegionVid {
192 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
193 write!(f, "'_#{}r", self.index())
197 impl fmt::Debug for ty::InferTy {
198 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
200 ty::TyVar(ref v) => v.fmt(f),
201 ty::IntVar(ref v) => v.fmt(f),
202 ty::FloatVar(ref v) => v.fmt(f),
203 ty::FreshTy(v) => write!(f, "FreshTy({:?})", v),
204 ty::FreshIntTy(v) => write!(f, "FreshIntTy({:?})", v),
205 ty::FreshFloatTy(v) => write!(f, "FreshFloatTy({:?})", v),
210 impl fmt::Debug for ty::IntVarValue {
211 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
213 ty::IntType(ref v) => v.fmt(f),
214 ty::UintType(ref v) => v.fmt(f),
219 impl fmt::Debug for ty::FloatVarValue {
220 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
225 impl fmt::Debug for ty::TraitRef<'tcx> {
226 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
227 // HACK(eddyb) this is used across the compiler to print
228 // a `TraitRef` qualified (with the Self type explicit),
229 // instead of having a different way to make that choice.
230 write!(f, "<{} as {}>", self.self_ty(), self)
234 impl fmt::Debug for Ty<'tcx> {
235 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
236 fmt::Display::fmt(self, f)
240 impl fmt::Debug for ty::ParamTy {
241 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
242 write!(f, "{}/#{}", self.name, self.idx)
246 impl fmt::Debug for ty::ParamConst {
247 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
248 write!(f, "{}/#{}", self.name, self.index)
252 impl fmt::Debug for ty::TraitPredicate<'tcx> {
253 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
254 write!(f, "TraitPredicate({:?})", self.trait_ref)
258 impl fmt::Debug for ty::ProjectionPredicate<'tcx> {
259 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
260 write!(f, "ProjectionPredicate({:?}, {:?})", self.projection_ty, self.ty)
264 impl fmt::Debug for ty::Predicate<'tcx> {
265 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
267 ty::Predicate::Trait(ref a) => a.fmt(f),
268 ty::Predicate::Subtype(ref pair) => pair.fmt(f),
269 ty::Predicate::RegionOutlives(ref pair) => pair.fmt(f),
270 ty::Predicate::TypeOutlives(ref pair) => pair.fmt(f),
271 ty::Predicate::Projection(ref pair) => pair.fmt(f),
272 ty::Predicate::WellFormed(ty) => write!(f, "WellFormed({:?})", ty),
273 ty::Predicate::ObjectSafe(trait_def_id) => {
274 write!(f, "ObjectSafe({:?})", trait_def_id)
276 ty::Predicate::ClosureKind(closure_def_id, closure_substs, kind) => {
277 write!(f, "ClosureKind({:?}, {:?}, {:?})",
278 closure_def_id, closure_substs, kind)
280 ty::Predicate::ConstEvaluatable(def_id, substs) => {
281 write!(f, "ConstEvaluatable({:?}, {:?})", def_id, substs)
287 ///////////////////////////////////////////////////////////////////////////
290 // For things that don't carry any arena-allocated data (and are
291 // copy...), just add them to this list.
293 CloneTypeFoldableAndLiftImpls! {
297 crate::ty::layout::VariantIdx,
300 crate::middle::region::Scope,
301 ::syntax::ast::FloatTy,
302 ::syntax::ast::NodeId,
303 ::syntax_pos::symbol::Symbol,
304 crate::hir::def::Def,
305 crate::hir::def_id::DefId,
306 crate::hir::InlineAsm,
307 crate::hir::MatchSource,
308 crate::hir::Mutability,
309 crate::hir::Unsafety,
310 ::rustc_target::spec::abi::Abi,
312 crate::mir::Promoted,
313 crate::traits::Reveal,
314 crate::ty::adjustment::AutoBorrowMutability,
316 // Including `BoundRegion` is a *bit* dubious, but direct
317 // references to bound region appear in `ty::Error`, and aren't
318 // really meant to be folded. In general, we can only fold a fully
320 crate::ty::BoundRegion,
321 crate::ty::Placeholder<crate::ty::BoundRegion>,
322 crate::ty::ClosureKind,
323 crate::ty::FreeRegion,
325 crate::ty::IntVarValue,
326 crate::ty::ParamConst,
328 crate::ty::RegionVid,
329 crate::ty::UniverseIndex,
334 ///////////////////////////////////////////////////////////////////////////
335 // Lift implementations
337 impl<'tcx, A: Lift<'tcx>, B: Lift<'tcx>> Lift<'tcx> for (A, B) {
338 type Lifted = (A::Lifted, B::Lifted);
339 fn lift_to_tcx<'a, 'gcx>(&self, tcx: TyCtxt<'a, 'gcx, 'tcx>) -> Option<Self::Lifted> {
340 tcx.lift(&self.0).and_then(|a| tcx.lift(&self.1).map(|b| (a, b)))
344 impl<'tcx, A: Lift<'tcx>, B: Lift<'tcx>, C: Lift<'tcx>> Lift<'tcx> for (A, B, C) {
345 type Lifted = (A::Lifted, B::Lifted, C::Lifted);
346 fn lift_to_tcx<'a, 'gcx>(&self, tcx: TyCtxt<'a, 'gcx, 'tcx>) -> Option<Self::Lifted> {
347 tcx.lift(&self.0).and_then(|a| {
348 tcx.lift(&self.1).and_then(|b| tcx.lift(&self.2).map(|c| (a, b, c)))
353 impl<'tcx, T: Lift<'tcx>> Lift<'tcx> for Option<T> {
354 type Lifted = Option<T::Lifted>;
355 fn lift_to_tcx<'a, 'gcx>(&self, tcx: TyCtxt<'a, 'gcx, 'tcx>) -> Option<Self::Lifted> {
357 Some(ref x) => tcx.lift(x).map(Some),
363 impl<'tcx, T: Lift<'tcx>, E: Lift<'tcx>> Lift<'tcx> for Result<T, E> {
364 type Lifted = Result<T::Lifted, E::Lifted>;
365 fn lift_to_tcx<'a, 'gcx>(&self, tcx: TyCtxt<'a, 'gcx, 'tcx>) -> Option<Self::Lifted> {
367 Ok(ref x) => tcx.lift(x).map(Ok),
368 Err(ref e) => tcx.lift(e).map(Err)
373 impl<'tcx, T: Lift<'tcx>> Lift<'tcx> for Box<T> {
374 type Lifted = Box<T::Lifted>;
375 fn lift_to_tcx<'a, 'gcx>(&self, tcx: TyCtxt<'a, 'gcx, 'tcx>) -> Option<Self::Lifted> {
376 tcx.lift(&**self).map(Box::new)
380 impl<'tcx, T: Lift<'tcx>> Lift<'tcx> for [T] {
381 type Lifted = Vec<T::Lifted>;
382 fn lift_to_tcx<'a, 'gcx>(&self, tcx: TyCtxt<'a, 'gcx, 'tcx>) -> Option<Self::Lifted> {
383 // type annotation needed to inform `projection_must_outlive`
384 let mut result : Vec<<T as Lift<'tcx>>::Lifted>
385 = Vec::with_capacity(self.len());
387 if let Some(value) = tcx.lift(x) {
397 impl<'tcx, T: Lift<'tcx>> Lift<'tcx> for Vec<T> {
398 type Lifted = Vec<T::Lifted>;
399 fn lift_to_tcx<'a, 'gcx>(&self, tcx: TyCtxt<'a, 'gcx, 'tcx>) -> Option<Self::Lifted> {
404 impl<'tcx, I: Idx, T: Lift<'tcx>> Lift<'tcx> for IndexVec<I, T> {
405 type Lifted = IndexVec<I, T::Lifted>;
406 fn lift_to_tcx<'a, 'gcx>(&self, tcx: TyCtxt<'a, 'gcx, 'tcx>) -> Option<Self::Lifted> {
408 .map(|e| tcx.lift(e))
413 impl<'a, 'tcx> Lift<'tcx> for ty::TraitRef<'a> {
414 type Lifted = ty::TraitRef<'tcx>;
415 fn lift_to_tcx<'b, 'gcx>(&self, tcx: TyCtxt<'b, 'gcx, 'tcx>) -> Option<Self::Lifted> {
416 tcx.lift(&self.substs).map(|substs| ty::TraitRef {
423 impl<'a, 'tcx> Lift<'tcx> for ty::ExistentialTraitRef<'a> {
424 type Lifted = ty::ExistentialTraitRef<'tcx>;
425 fn lift_to_tcx<'b, 'gcx>(&self, tcx: TyCtxt<'b, 'gcx, 'tcx>) -> Option<Self::Lifted> {
426 tcx.lift(&self.substs).map(|substs| ty::ExistentialTraitRef {
433 impl<'a, 'tcx> Lift<'tcx> for ty::TraitPredicate<'a> {
434 type Lifted = ty::TraitPredicate<'tcx>;
435 fn lift_to_tcx<'b, 'gcx>(&self, tcx: TyCtxt<'b, 'gcx, 'tcx>)
436 -> Option<ty::TraitPredicate<'tcx>> {
437 tcx.lift(&self.trait_ref).map(|trait_ref| ty::TraitPredicate {
443 impl<'a, 'tcx> Lift<'tcx> for ty::SubtypePredicate<'a> {
444 type Lifted = ty::SubtypePredicate<'tcx>;
445 fn lift_to_tcx<'b, 'gcx>(&self, tcx: TyCtxt<'b, 'gcx, 'tcx>)
446 -> Option<ty::SubtypePredicate<'tcx>> {
447 tcx.lift(&(self.a, self.b)).map(|(a, b)| ty::SubtypePredicate {
448 a_is_expected: self.a_is_expected,
455 impl<'tcx, A: Copy+Lift<'tcx>, B: Copy+Lift<'tcx>> Lift<'tcx> for ty::OutlivesPredicate<A, B> {
456 type Lifted = ty::OutlivesPredicate<A::Lifted, B::Lifted>;
457 fn lift_to_tcx<'a, 'gcx>(&self, tcx: TyCtxt<'a, 'gcx, 'tcx>) -> Option<Self::Lifted> {
458 tcx.lift(&(self.0, self.1)).map(|(a, b)| ty::OutlivesPredicate(a, b))
462 impl<'a, 'tcx> Lift<'tcx> for ty::ProjectionTy<'a> {
463 type Lifted = ty::ProjectionTy<'tcx>;
464 fn lift_to_tcx<'b, 'gcx>(&self, tcx: TyCtxt<'b, 'gcx, 'tcx>)
465 -> Option<ty::ProjectionTy<'tcx>> {
466 tcx.lift(&self.substs).map(|substs| {
468 item_def_id: self.item_def_id,
475 impl<'a, 'tcx> Lift<'tcx> for ty::ProjectionPredicate<'a> {
476 type Lifted = ty::ProjectionPredicate<'tcx>;
477 fn lift_to_tcx<'b, 'gcx>(&self, tcx: TyCtxt<'b, 'gcx, 'tcx>)
478 -> Option<ty::ProjectionPredicate<'tcx>> {
479 tcx.lift(&(self.projection_ty, self.ty)).map(|(projection_ty, ty)| {
480 ty::ProjectionPredicate {
488 impl<'a, 'tcx> Lift<'tcx> for ty::ExistentialProjection<'a> {
489 type Lifted = ty::ExistentialProjection<'tcx>;
490 fn lift_to_tcx<'b, 'gcx>(&self, tcx: TyCtxt<'b, 'gcx, 'tcx>) -> Option<Self::Lifted> {
491 tcx.lift(&self.substs).map(|substs| {
492 ty::ExistentialProjection {
494 ty: tcx.lift(&self.ty).expect("type must lift when substs do"),
495 item_def_id: self.item_def_id,
501 impl<'a, 'tcx> Lift<'tcx> for ty::Predicate<'a> {
502 type Lifted = ty::Predicate<'tcx>;
503 fn lift_to_tcx<'b, 'gcx>(&self, tcx: TyCtxt<'b, 'gcx, 'tcx>) -> Option<Self::Lifted> {
505 ty::Predicate::Trait(ref binder) => {
506 tcx.lift(binder).map(ty::Predicate::Trait)
508 ty::Predicate::Subtype(ref binder) => {
509 tcx.lift(binder).map(ty::Predicate::Subtype)
511 ty::Predicate::RegionOutlives(ref binder) => {
512 tcx.lift(binder).map(ty::Predicate::RegionOutlives)
514 ty::Predicate::TypeOutlives(ref binder) => {
515 tcx.lift(binder).map(ty::Predicate::TypeOutlives)
517 ty::Predicate::Projection(ref binder) => {
518 tcx.lift(binder).map(ty::Predicate::Projection)
520 ty::Predicate::WellFormed(ty) => {
521 tcx.lift(&ty).map(ty::Predicate::WellFormed)
523 ty::Predicate::ClosureKind(closure_def_id, closure_substs, kind) => {
524 tcx.lift(&closure_substs)
525 .map(|closure_substs| ty::Predicate::ClosureKind(closure_def_id,
529 ty::Predicate::ObjectSafe(trait_def_id) => {
530 Some(ty::Predicate::ObjectSafe(trait_def_id))
532 ty::Predicate::ConstEvaluatable(def_id, substs) => {
533 tcx.lift(&substs).map(|substs| {
534 ty::Predicate::ConstEvaluatable(def_id, substs)
541 impl<'tcx, T: Lift<'tcx>> Lift<'tcx> for ty::Binder<T> {
542 type Lifted = ty::Binder<T::Lifted>;
543 fn lift_to_tcx<'a, 'gcx>(&self, tcx: TyCtxt<'a, 'gcx, 'tcx>) -> Option<Self::Lifted> {
544 tcx.lift(self.skip_binder()).map(ty::Binder::bind)
548 impl<'a, 'tcx> Lift<'tcx> for ty::ParamEnv<'a> {
549 type Lifted = ty::ParamEnv<'tcx>;
550 fn lift_to_tcx<'b, 'gcx>(&self, tcx: TyCtxt<'b, 'gcx, 'tcx>) -> Option<Self::Lifted> {
551 tcx.lift(&self.caller_bounds).map(|caller_bounds| {
561 impl<'a, 'tcx, T: Lift<'tcx>> Lift<'tcx> for ty::ParamEnvAnd<'a, T> {
562 type Lifted = ty::ParamEnvAnd<'tcx, T::Lifted>;
563 fn lift_to_tcx<'b, 'gcx>(&self, tcx: TyCtxt<'b, 'gcx, 'tcx>) -> Option<Self::Lifted> {
564 tcx.lift(&self.param_env).and_then(|param_env| {
565 tcx.lift(&self.value).map(|value| {
575 impl<'a, 'tcx> Lift<'tcx> for ty::ClosureSubsts<'a> {
576 type Lifted = ty::ClosureSubsts<'tcx>;
577 fn lift_to_tcx<'b, 'gcx>(&self, tcx: TyCtxt<'b, 'gcx, 'tcx>) -> Option<Self::Lifted> {
578 tcx.lift(&self.substs).map(|substs| {
579 ty::ClosureSubsts { substs }
584 impl<'a, 'tcx> Lift<'tcx> for ty::GeneratorSubsts<'a> {
585 type Lifted = ty::GeneratorSubsts<'tcx>;
586 fn lift_to_tcx<'b, 'gcx>(&self, tcx: TyCtxt<'b, 'gcx, 'tcx>) -> Option<Self::Lifted> {
587 tcx.lift(&self.substs).map(|substs| {
588 ty::GeneratorSubsts { substs }
593 impl<'a, 'tcx> Lift<'tcx> for ty::adjustment::Adjustment<'a> {
594 type Lifted = ty::adjustment::Adjustment<'tcx>;
595 fn lift_to_tcx<'b, 'gcx>(&self, tcx: TyCtxt<'b, 'gcx, 'tcx>) -> Option<Self::Lifted> {
596 tcx.lift(&self.kind).and_then(|kind| {
597 tcx.lift(&self.target).map(|target| {
598 ty::adjustment::Adjustment { kind, target }
604 impl<'a, 'tcx> Lift<'tcx> for ty::adjustment::Adjust<'a> {
605 type Lifted = ty::adjustment::Adjust<'tcx>;
606 fn lift_to_tcx<'b, 'gcx>(&self, tcx: TyCtxt<'b, 'gcx, 'tcx>) -> Option<Self::Lifted> {
608 ty::adjustment::Adjust::NeverToAny =>
609 Some(ty::adjustment::Adjust::NeverToAny),
610 ty::adjustment::Adjust::ReifyFnPointer =>
611 Some(ty::adjustment::Adjust::ReifyFnPointer),
612 ty::adjustment::Adjust::UnsafeFnPointer =>
613 Some(ty::adjustment::Adjust::UnsafeFnPointer),
614 ty::adjustment::Adjust::ClosureFnPointer =>
615 Some(ty::adjustment::Adjust::ClosureFnPointer),
616 ty::adjustment::Adjust::MutToConstPointer =>
617 Some(ty::adjustment::Adjust::MutToConstPointer),
618 ty::adjustment::Adjust::Unsize =>
619 Some(ty::adjustment::Adjust::Unsize),
620 ty::adjustment::Adjust::Deref(ref overloaded) => {
621 tcx.lift(overloaded).map(ty::adjustment::Adjust::Deref)
623 ty::adjustment::Adjust::Borrow(ref autoref) => {
624 tcx.lift(autoref).map(ty::adjustment::Adjust::Borrow)
630 impl<'a, 'tcx> Lift<'tcx> for ty::adjustment::OverloadedDeref<'a> {
631 type Lifted = ty::adjustment::OverloadedDeref<'tcx>;
632 fn lift_to_tcx<'b, 'gcx>(&self, tcx: TyCtxt<'b, 'gcx, 'tcx>) -> Option<Self::Lifted> {
633 tcx.lift(&self.region).map(|region| {
634 ty::adjustment::OverloadedDeref {
642 impl<'a, 'tcx> Lift<'tcx> for ty::adjustment::AutoBorrow<'a> {
643 type Lifted = ty::adjustment::AutoBorrow<'tcx>;
644 fn lift_to_tcx<'b, 'gcx>(&self, tcx: TyCtxt<'b, 'gcx, 'tcx>) -> Option<Self::Lifted> {
646 ty::adjustment::AutoBorrow::Ref(r, m) => {
647 tcx.lift(&r).map(|r| ty::adjustment::AutoBorrow::Ref(r, m))
649 ty::adjustment::AutoBorrow::RawPtr(m) => {
650 Some(ty::adjustment::AutoBorrow::RawPtr(m))
656 impl<'a, 'tcx> Lift<'tcx> for ty::GenSig<'a> {
657 type Lifted = ty::GenSig<'tcx>;
658 fn lift_to_tcx<'b, 'gcx>(&self, tcx: TyCtxt<'b, 'gcx, 'tcx>) -> Option<Self::Lifted> {
659 tcx.lift(&(self.yield_ty, self.return_ty))
660 .map(|(yield_ty, return_ty)| {
669 impl<'a, 'tcx> Lift<'tcx> for ty::FnSig<'a> {
670 type Lifted = ty::FnSig<'tcx>;
671 fn lift_to_tcx<'b, 'gcx>(&self, tcx: TyCtxt<'b, 'gcx, 'tcx>) -> Option<Self::Lifted> {
672 tcx.lift(&self.inputs_and_output).map(|x| {
674 inputs_and_output: x,
675 c_variadic: self.c_variadic,
676 unsafety: self.unsafety,
683 impl<'tcx, T: Lift<'tcx>> Lift<'tcx> for ty::error::ExpectedFound<T> {
684 type Lifted = ty::error::ExpectedFound<T::Lifted>;
685 fn lift_to_tcx<'a, 'gcx>(&self, tcx: TyCtxt<'a, 'gcx, 'tcx>) -> Option<Self::Lifted> {
686 tcx.lift(&self.expected).and_then(|expected| {
687 tcx.lift(&self.found).map(|found| {
688 ty::error::ExpectedFound {
697 impl<'a, 'tcx> Lift<'tcx> for ty::error::TypeError<'a> {
698 type Lifted = ty::error::TypeError<'tcx>;
699 fn lift_to_tcx<'b, 'gcx>(&self, tcx: TyCtxt<'b, 'gcx, 'tcx>) -> Option<Self::Lifted> {
700 use crate::ty::error::TypeError::*;
703 Mismatch => Mismatch,
704 UnsafetyMismatch(x) => UnsafetyMismatch(x),
705 AbiMismatch(x) => AbiMismatch(x),
706 Mutability => Mutability,
707 TupleSize(x) => TupleSize(x),
708 FixedArraySize(x) => FixedArraySize(x),
709 ArgCount => ArgCount,
710 RegionsDoesNotOutlive(a, b) => {
711 return tcx.lift(&(a, b)).map(|(a, b)| RegionsDoesNotOutlive(a, b))
713 RegionsInsufficientlyPolymorphic(a, b) => {
714 return tcx.lift(&b).map(|b| RegionsInsufficientlyPolymorphic(a, b))
716 RegionsOverlyPolymorphic(a, b) => {
717 return tcx.lift(&b).map(|b| RegionsOverlyPolymorphic(a, b))
719 RegionsPlaceholderMismatch => RegionsPlaceholderMismatch,
720 IntMismatch(x) => IntMismatch(x),
721 FloatMismatch(x) => FloatMismatch(x),
722 Traits(x) => Traits(x),
723 VariadicMismatch(x) => VariadicMismatch(x),
724 CyclicTy(t) => return tcx.lift(&t).map(|t| CyclicTy(t)),
725 ProjectionMismatched(x) => ProjectionMismatched(x),
726 ProjectionBoundsLength(x) => ProjectionBoundsLength(x),
727 Sorts(ref x) => return tcx.lift(x).map(Sorts),
728 ExistentialMismatch(ref x) => return tcx.lift(x).map(ExistentialMismatch)
733 impl<'a, 'tcx> Lift<'tcx> for ty::InstanceDef<'a> {
734 type Lifted = ty::InstanceDef<'tcx>;
735 fn lift_to_tcx<'b, 'gcx>(&self, tcx: TyCtxt<'b, 'gcx, 'tcx>) -> Option<Self::Lifted> {
737 ty::InstanceDef::Item(def_id) =>
738 Some(ty::InstanceDef::Item(def_id)),
739 ty::InstanceDef::VtableShim(def_id) =>
740 Some(ty::InstanceDef::VtableShim(def_id)),
741 ty::InstanceDef::Intrinsic(def_id) =>
742 Some(ty::InstanceDef::Intrinsic(def_id)),
743 ty::InstanceDef::FnPtrShim(def_id, ref ty) =>
744 Some(ty::InstanceDef::FnPtrShim(def_id, tcx.lift(ty)?)),
745 ty::InstanceDef::Virtual(def_id, n) =>
746 Some(ty::InstanceDef::Virtual(def_id, n)),
747 ty::InstanceDef::ClosureOnceShim { call_once } =>
748 Some(ty::InstanceDef::ClosureOnceShim { call_once }),
749 ty::InstanceDef::DropGlue(def_id, ref ty) =>
750 Some(ty::InstanceDef::DropGlue(def_id, tcx.lift(ty)?)),
751 ty::InstanceDef::CloneShim(def_id, ref ty) =>
752 Some(ty::InstanceDef::CloneShim(def_id, tcx.lift(ty)?)),
757 BraceStructLiftImpl! {
758 impl<'a, 'tcx> Lift<'tcx> for ty::TypeAndMut<'a> {
759 type Lifted = ty::TypeAndMut<'tcx>;
764 BraceStructLiftImpl! {
765 impl<'a, 'tcx> Lift<'tcx> for ty::Instance<'a> {
766 type Lifted = ty::Instance<'tcx>;
771 BraceStructLiftImpl! {
772 impl<'a, 'tcx> Lift<'tcx> for interpret::GlobalId<'a> {
773 type Lifted = interpret::GlobalId<'tcx>;
778 // FIXME(eddyb) this is like what some of the macros above generate,
779 // except that macros *also* generate a foldable impl, which we don't
780 // want (with it we'd risk bypassing `fold_region` / `fold_const`).
781 impl<'tcx> Lift<'tcx> for ty::RegionKind {
782 type Lifted = ty::RegionKind;
783 fn lift_to_tcx<'b, 'gcx>(&self, _: TyCtxt<'b, 'gcx, 'tcx>) -> Option<Self::Lifted> {
788 impl<'a, 'tcx> Lift<'tcx> for ty::LazyConst<'a> {
789 type Lifted = ty::LazyConst<'tcx>;
790 fn lift_to_tcx<'b, 'gcx>(&self, tcx: TyCtxt<'b, 'gcx, 'tcx>) -> Option<Self::Lifted> {
792 ty::LazyConst::Evaluated(v) => Some(ty::LazyConst::Evaluated(tcx.lift(v)?)),
793 ty::LazyConst::Unevaluated(def_id, substs) => {
794 Some(ty::LazyConst::Unevaluated(*def_id, tcx.lift(substs)?))
800 BraceStructLiftImpl! {
801 impl<'a, 'tcx> Lift<'tcx> for ty::Const<'a> {
802 type Lifted = ty::Const<'tcx>;
807 impl<'a, 'tcx> Lift<'tcx> for ConstValue<'a> {
808 type Lifted = ConstValue<'tcx>;
809 fn lift_to_tcx<'b, 'gcx>(&self, tcx: TyCtxt<'b, 'gcx, 'tcx>) -> Option<Self::Lifted> {
811 ConstValue::Param(param) => Some(ConstValue::Param(param)),
812 ConstValue::Infer(infer) => {
813 Some(ConstValue::Infer(match infer {
814 InferConst::Var(vid) => InferConst::Var(vid.lift_to_tcx(tcx)?),
815 InferConst::Fresh(i) => InferConst::Fresh(i),
816 InferConst::Canonical(debrujin, var) => InferConst::Canonical(debrujin, var),
819 ConstValue::Scalar(x) => Some(ConstValue::Scalar(x)),
820 ConstValue::Slice(x, y) => Some(ConstValue::Slice(x, y)),
821 ConstValue::ByRef(ptr, alloc) => Some(ConstValue::ByRef(
822 ptr, alloc.lift_to_tcx(tcx)?,
828 impl<'a, 'tcx> Lift<'tcx> for ConstVid<'a> {
829 type Lifted = ConstVid<'tcx>;
830 fn lift_to_tcx<'b, 'gcx>(&self, _: TyCtxt<'b, 'gcx, 'tcx>) -> Option<Self::Lifted> {
833 phantom: PhantomData,
838 ///////////////////////////////////////////////////////////////////////////
839 // TypeFoldable implementations.
841 // Ideally, each type should invoke `folder.fold_foo(self)` and
842 // nothing else. In some cases, though, we haven't gotten around to
843 // adding methods on the `folder` yet, and thus the folding is
844 // hard-coded here. This is less-flexible, because folders cannot
845 // override the behavior, but there are a lot of random types and one
846 // can easily refactor the folding into the TypeFolder trait as
849 /// AdtDefs are basically the same as a DefId.
850 impl<'tcx> TypeFoldable<'tcx> for &'tcx ty::AdtDef {
851 fn super_fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(&self, _folder: &mut F) -> Self {
855 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, _visitor: &mut V) -> bool {
860 impl<'tcx, T:TypeFoldable<'tcx>, U:TypeFoldable<'tcx>> TypeFoldable<'tcx> for (T, U) {
861 fn super_fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(&self, folder: &mut F) -> (T, U) {
862 (self.0.fold_with(folder), self.1.fold_with(folder))
865 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool {
866 self.0.visit_with(visitor) || self.1.visit_with(visitor)
870 EnumTypeFoldableImpl! {
871 impl<'tcx, T> TypeFoldable<'tcx> for Option<T> {
874 } where T: TypeFoldable<'tcx>
877 impl<'tcx, T: TypeFoldable<'tcx>> TypeFoldable<'tcx> for Rc<T> {
878 fn super_fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(&self, folder: &mut F) -> Self {
879 Rc::new((**self).fold_with(folder))
882 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool {
883 (**self).visit_with(visitor)
887 impl<'tcx, T: TypeFoldable<'tcx>> TypeFoldable<'tcx> for Box<T> {
888 fn super_fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(&self, folder: &mut F) -> Self {
889 let content: T = (**self).fold_with(folder);
893 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool {
894 (**self).visit_with(visitor)
898 impl<'tcx, T: TypeFoldable<'tcx>> TypeFoldable<'tcx> for Vec<T> {
899 fn super_fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(&self, folder: &mut F) -> Self {
900 self.iter().map(|t| t.fold_with(folder)).collect()
903 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool {
904 self.iter().any(|t| t.visit_with(visitor))
908 impl<'tcx, T: TypeFoldable<'tcx>> TypeFoldable<'tcx> for Box<[T]> {
909 fn super_fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(&self, folder: &mut F) -> Self {
910 self.iter().map(|t| t.fold_with(folder)).collect::<Vec<_>>().into_boxed_slice()
913 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool {
914 self.iter().any(|t| t.visit_with(visitor))
918 impl<'tcx, T:TypeFoldable<'tcx>> TypeFoldable<'tcx> for ty::Binder<T> {
919 fn super_fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(&self, folder: &mut F) -> Self {
920 self.map_bound_ref(|ty| ty.fold_with(folder))
923 fn fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(&self, folder: &mut F) -> Self {
924 folder.fold_binder(self)
927 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool {
928 self.skip_binder().visit_with(visitor)
931 fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool {
932 visitor.visit_binder(self)
936 BraceStructTypeFoldableImpl! {
937 impl<'tcx> TypeFoldable<'tcx> for ty::ParamEnv<'tcx> { reveal, caller_bounds, def_id }
940 impl<'tcx> TypeFoldable<'tcx> for &'tcx ty::List<ty::ExistentialPredicate<'tcx>> {
941 fn super_fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(&self, folder: &mut F) -> Self {
942 let v = self.iter().map(|p| p.fold_with(folder)).collect::<SmallVec<[_; 8]>>();
943 folder.tcx().intern_existential_predicates(&v)
946 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool {
947 self.iter().any(|p| p.visit_with(visitor))
951 EnumTypeFoldableImpl! {
952 impl<'tcx> TypeFoldable<'tcx> for ty::ExistentialPredicate<'tcx> {
953 (ty::ExistentialPredicate::Trait)(a),
954 (ty::ExistentialPredicate::Projection)(a),
955 (ty::ExistentialPredicate::AutoTrait)(a),
959 impl<'tcx> TypeFoldable<'tcx> for &'tcx ty::List<Ty<'tcx>> {
960 fn super_fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(&self, folder: &mut F) -> Self {
961 let v = self.iter().map(|t| t.fold_with(folder)).collect::<SmallVec<[_; 8]>>();
962 folder.tcx().intern_type_list(&v)
965 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool {
966 self.iter().any(|t| t.visit_with(visitor))
970 impl<'tcx> TypeFoldable<'tcx> for &'tcx ty::List<ProjectionKind<'tcx>> {
971 fn super_fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(&self, folder: &mut F) -> Self {
972 let v = self.iter().map(|t| t.fold_with(folder)).collect::<SmallVec<[_; 8]>>();
973 folder.tcx().intern_projs(&v)
976 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool {
977 self.iter().any(|t| t.visit_with(visitor))
981 impl<'tcx> TypeFoldable<'tcx> for ty::instance::Instance<'tcx> {
982 fn super_fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(&self, folder: &mut F) -> Self {
983 use crate::ty::InstanceDef::*;
985 substs: self.substs.fold_with(folder),
986 def: match self.def {
987 Item(did) => Item(did.fold_with(folder)),
988 VtableShim(did) => VtableShim(did.fold_with(folder)),
989 Intrinsic(did) => Intrinsic(did.fold_with(folder)),
990 FnPtrShim(did, ty) => FnPtrShim(
991 did.fold_with(folder),
992 ty.fold_with(folder),
994 Virtual(did, i) => Virtual(
995 did.fold_with(folder),
998 ClosureOnceShim { call_once } => ClosureOnceShim {
999 call_once: call_once.fold_with(folder),
1001 DropGlue(did, ty) => DropGlue(
1002 did.fold_with(folder),
1003 ty.fold_with(folder),
1005 CloneShim(did, ty) => CloneShim(
1006 did.fold_with(folder),
1007 ty.fold_with(folder),
1013 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool {
1014 use crate::ty::InstanceDef::*;
1015 self.substs.visit_with(visitor) ||
1017 Item(did) | VtableShim(did) | Intrinsic(did) | Virtual(did, _) => {
1018 did.visit_with(visitor)
1020 FnPtrShim(did, ty) | CloneShim(did, ty) => {
1021 did.visit_with(visitor) || ty.visit_with(visitor)
1023 DropGlue(did, ty) => {
1024 did.visit_with(visitor) || ty.visit_with(visitor)
1026 ClosureOnceShim { call_once } => call_once.visit_with(visitor),
1031 impl<'tcx> TypeFoldable<'tcx> for interpret::GlobalId<'tcx> {
1032 fn super_fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(&self, folder: &mut F) -> Self {
1034 instance: self.instance.fold_with(folder),
1035 promoted: self.promoted
1039 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool {
1040 self.instance.visit_with(visitor)
1044 impl<'tcx> TypeFoldable<'tcx> for Ty<'tcx> {
1045 fn super_fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(&self, folder: &mut F) -> Self {
1046 let sty = match self.sty {
1047 ty::RawPtr(tm) => ty::RawPtr(tm.fold_with(folder)),
1048 ty::Array(typ, sz) => ty::Array(typ.fold_with(folder), sz.fold_with(folder)),
1049 ty::Slice(typ) => ty::Slice(typ.fold_with(folder)),
1050 ty::Adt(tid, substs) => ty::Adt(tid, substs.fold_with(folder)),
1051 ty::Dynamic(ref trait_ty, ref region) =>
1052 ty::Dynamic(trait_ty.fold_with(folder), region.fold_with(folder)),
1053 ty::Tuple(ts) => ty::Tuple(ts.fold_with(folder)),
1054 ty::FnDef(def_id, substs) => {
1055 ty::FnDef(def_id, substs.fold_with(folder))
1057 ty::FnPtr(f) => ty::FnPtr(f.fold_with(folder)),
1058 ty::Ref(ref r, ty, mutbl) => {
1059 ty::Ref(r.fold_with(folder), ty.fold_with(folder), mutbl)
1061 ty::Generator(did, substs, movability) => {
1064 substs.fold_with(folder),
1067 ty::GeneratorWitness(types) => ty::GeneratorWitness(types.fold_with(folder)),
1068 ty::Closure(did, substs) => ty::Closure(did, substs.fold_with(folder)),
1069 ty::Projection(ref data) => ty::Projection(data.fold_with(folder)),
1070 ty::UnnormalizedProjection(ref data) => {
1071 ty::UnnormalizedProjection(data.fold_with(folder))
1073 ty::Opaque(did, substs) => ty::Opaque(did, substs.fold_with(folder)),
1085 ty::Placeholder(..) |
1087 ty::Foreign(..) => return self
1090 if self.sty == sty {
1093 folder.tcx().mk_ty(sty)
1097 fn fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(&self, folder: &mut F) -> Self {
1098 folder.fold_ty(*self)
1101 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool {
1103 ty::RawPtr(ref tm) => tm.visit_with(visitor),
1104 ty::Array(typ, sz) => typ.visit_with(visitor) || sz.visit_with(visitor),
1105 ty::Slice(typ) => typ.visit_with(visitor),
1106 ty::Adt(_, substs) => substs.visit_with(visitor),
1107 ty::Dynamic(ref trait_ty, ref reg) =>
1108 trait_ty.visit_with(visitor) || reg.visit_with(visitor),
1109 ty::Tuple(ts) => ts.visit_with(visitor),
1110 ty::FnDef(_, substs) => substs.visit_with(visitor),
1111 ty::FnPtr(ref f) => f.visit_with(visitor),
1112 ty::Ref(r, ty, _) => r.visit_with(visitor) || ty.visit_with(visitor),
1113 ty::Generator(_did, ref substs, _) => {
1114 substs.visit_with(visitor)
1116 ty::GeneratorWitness(ref types) => types.visit_with(visitor),
1117 ty::Closure(_did, ref substs) => substs.visit_with(visitor),
1118 ty::Projection(ref data) | ty::UnnormalizedProjection(ref data) => {
1119 data.visit_with(visitor)
1121 ty::Opaque(_, ref substs) => substs.visit_with(visitor),
1132 ty::Placeholder(..) |
1135 ty::Foreign(..) => false,
1139 fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool {
1140 visitor.visit_ty(self)
1144 BraceStructTypeFoldableImpl! {
1145 impl<'tcx> TypeFoldable<'tcx> for ty::TypeAndMut<'tcx> {
1150 BraceStructTypeFoldableImpl! {
1151 impl<'tcx> TypeFoldable<'tcx> for ty::GenSig<'tcx> {
1156 BraceStructTypeFoldableImpl! {
1157 impl<'tcx> TypeFoldable<'tcx> for ty::FnSig<'tcx> {
1158 inputs_and_output, c_variadic, unsafety, abi
1162 BraceStructTypeFoldableImpl! {
1163 impl<'tcx> TypeFoldable<'tcx> for ty::TraitRef<'tcx> { def_id, substs }
1166 BraceStructTypeFoldableImpl! {
1167 impl<'tcx> TypeFoldable<'tcx> for ty::ExistentialTraitRef<'tcx> { def_id, substs }
1170 BraceStructTypeFoldableImpl! {
1171 impl<'tcx> TypeFoldable<'tcx> for ty::ImplHeader<'tcx> {
1179 impl<'tcx> TypeFoldable<'tcx> for ty::Region<'tcx> {
1180 fn super_fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(&self, _folder: &mut F) -> Self {
1184 fn fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(&self, folder: &mut F) -> Self {
1185 folder.fold_region(*self)
1188 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, _visitor: &mut V) -> bool {
1192 fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool {
1193 visitor.visit_region(*self)
1197 BraceStructTypeFoldableImpl! {
1198 impl<'tcx> TypeFoldable<'tcx> for ty::ClosureSubsts<'tcx> {
1203 BraceStructTypeFoldableImpl! {
1204 impl<'tcx> TypeFoldable<'tcx> for ty::GeneratorSubsts<'tcx> {
1209 BraceStructTypeFoldableImpl! {
1210 impl<'tcx> TypeFoldable<'tcx> for ty::adjustment::Adjustment<'tcx> {
1216 EnumTypeFoldableImpl! {
1217 impl<'tcx> TypeFoldable<'tcx> for ty::adjustment::Adjust<'tcx> {
1218 (ty::adjustment::Adjust::NeverToAny),
1219 (ty::adjustment::Adjust::ReifyFnPointer),
1220 (ty::adjustment::Adjust::UnsafeFnPointer),
1221 (ty::adjustment::Adjust::ClosureFnPointer),
1222 (ty::adjustment::Adjust::MutToConstPointer),
1223 (ty::adjustment::Adjust::Unsize),
1224 (ty::adjustment::Adjust::Deref)(a),
1225 (ty::adjustment::Adjust::Borrow)(a),
1229 BraceStructTypeFoldableImpl! {
1230 impl<'tcx> TypeFoldable<'tcx> for ty::adjustment::OverloadedDeref<'tcx> {
1235 EnumTypeFoldableImpl! {
1236 impl<'tcx> TypeFoldable<'tcx> for ty::adjustment::AutoBorrow<'tcx> {
1237 (ty::adjustment::AutoBorrow::Ref)(a, b),
1238 (ty::adjustment::AutoBorrow::RawPtr)(m),
1242 BraceStructTypeFoldableImpl! {
1243 impl<'tcx> TypeFoldable<'tcx> for ty::GenericPredicates<'tcx> {
1248 impl<'tcx> TypeFoldable<'tcx> for &'tcx ty::List<ty::Predicate<'tcx>> {
1249 fn super_fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(&self, folder: &mut F) -> Self {
1250 let v = self.iter().map(|p| p.fold_with(folder)).collect::<SmallVec<[_; 8]>>();
1251 folder.tcx().intern_predicates(&v)
1254 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool {
1255 self.iter().any(|p| p.visit_with(visitor))
1259 EnumTypeFoldableImpl! {
1260 impl<'tcx> TypeFoldable<'tcx> for ty::Predicate<'tcx> {
1261 (ty::Predicate::Trait)(a),
1262 (ty::Predicate::Subtype)(a),
1263 (ty::Predicate::RegionOutlives)(a),
1264 (ty::Predicate::TypeOutlives)(a),
1265 (ty::Predicate::Projection)(a),
1266 (ty::Predicate::WellFormed)(a),
1267 (ty::Predicate::ClosureKind)(a, b, c),
1268 (ty::Predicate::ObjectSafe)(a),
1269 (ty::Predicate::ConstEvaluatable)(a, b),
1273 BraceStructTypeFoldableImpl! {
1274 impl<'tcx> TypeFoldable<'tcx> for ty::ProjectionPredicate<'tcx> {
1279 BraceStructTypeFoldableImpl! {
1280 impl<'tcx> TypeFoldable<'tcx> for ty::ExistentialProjection<'tcx> {
1281 ty, substs, item_def_id
1285 BraceStructTypeFoldableImpl! {
1286 impl<'tcx> TypeFoldable<'tcx> for ty::ProjectionTy<'tcx> {
1291 BraceStructTypeFoldableImpl! {
1292 impl<'tcx> TypeFoldable<'tcx> for ty::InstantiatedPredicates<'tcx> {
1297 BraceStructTypeFoldableImpl! {
1298 impl<'tcx, T> TypeFoldable<'tcx> for ty::ParamEnvAnd<'tcx, T> {
1300 } where T: TypeFoldable<'tcx>
1303 BraceStructTypeFoldableImpl! {
1304 impl<'tcx> TypeFoldable<'tcx> for ty::SubtypePredicate<'tcx> {
1309 BraceStructTypeFoldableImpl! {
1310 impl<'tcx> TypeFoldable<'tcx> for ty::TraitPredicate<'tcx> {
1315 TupleStructTypeFoldableImpl! {
1316 impl<'tcx,T,U> TypeFoldable<'tcx> for ty::OutlivesPredicate<T,U> {
1318 } where T : TypeFoldable<'tcx>, U : TypeFoldable<'tcx>,
1321 BraceStructTypeFoldableImpl! {
1322 impl<'tcx> TypeFoldable<'tcx> for ty::ClosureUpvar<'tcx> {
1327 BraceStructTypeFoldableImpl! {
1328 impl<'tcx, T> TypeFoldable<'tcx> for ty::error::ExpectedFound<T> {
1330 } where T: TypeFoldable<'tcx>
1333 impl<'tcx, T: TypeFoldable<'tcx>, I: Idx> TypeFoldable<'tcx> for IndexVec<I, T> {
1334 fn super_fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(&self, folder: &mut F) -> Self {
1335 self.iter().map(|x| x.fold_with(folder)).collect()
1338 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool {
1339 self.iter().any(|t| t.visit_with(visitor))
1343 EnumTypeFoldableImpl! {
1344 impl<'tcx> TypeFoldable<'tcx> for ty::error::TypeError<'tcx> {
1345 (ty::error::TypeError::Mismatch),
1346 (ty::error::TypeError::UnsafetyMismatch)(x),
1347 (ty::error::TypeError::AbiMismatch)(x),
1348 (ty::error::TypeError::Mutability),
1349 (ty::error::TypeError::TupleSize)(x),
1350 (ty::error::TypeError::FixedArraySize)(x),
1351 (ty::error::TypeError::ArgCount),
1352 (ty::error::TypeError::RegionsDoesNotOutlive)(a, b),
1353 (ty::error::TypeError::RegionsInsufficientlyPolymorphic)(a, b),
1354 (ty::error::TypeError::RegionsOverlyPolymorphic)(a, b),
1355 (ty::error::TypeError::RegionsPlaceholderMismatch),
1356 (ty::error::TypeError::IntMismatch)(x),
1357 (ty::error::TypeError::FloatMismatch)(x),
1358 (ty::error::TypeError::Traits)(x),
1359 (ty::error::TypeError::VariadicMismatch)(x),
1360 (ty::error::TypeError::CyclicTy)(t),
1361 (ty::error::TypeError::ProjectionMismatched)(x),
1362 (ty::error::TypeError::ProjectionBoundsLength)(x),
1363 (ty::error::TypeError::Sorts)(x),
1364 (ty::error::TypeError::ExistentialMismatch)(x),
1368 impl<'tcx> TypeFoldable<'tcx> for &'tcx ty::LazyConst<'tcx> {
1369 fn super_fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(&self, folder: &mut F) -> Self {
1370 let new = match self {
1371 ty::LazyConst::Evaluated(v) => ty::LazyConst::Evaluated(v.fold_with(folder)),
1372 ty::LazyConst::Unevaluated(def_id, substs) => {
1373 ty::LazyConst::Unevaluated(*def_id, substs.fold_with(folder))
1376 folder.tcx().mk_lazy_const(new)
1379 fn fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(&self, folder: &mut F) -> Self {
1380 folder.fold_const(*self)
1383 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool {
1385 ty::LazyConst::Evaluated(c) => c.visit_with(visitor),
1386 ty::LazyConst::Unevaluated(_, substs) => substs.visit_with(visitor),
1390 fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool {
1391 visitor.visit_const(self)
1395 impl<'tcx> TypeFoldable<'tcx> for ty::Const<'tcx> {
1396 fn super_fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(&self, folder: &mut F) -> Self {
1397 let ty = self.ty.fold_with(folder);
1398 let val = self.val.fold_with(folder);
1405 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool {
1406 self.ty.visit_with(visitor) || self.val.visit_with(visitor)
1410 impl<'tcx> TypeFoldable<'tcx> for ConstValue<'tcx> {
1411 fn super_fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(&self, _folder: &mut F) -> Self {
1415 fn super_visit_with<V: TypeVisitor<'tcx>>(&self, _visitor: &mut V) -> bool {