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-rw-r--r--compiler/rustc_middle/src/ty/structural_impls.rs1304
1 files changed, 1304 insertions, 0 deletions
diff --git a/compiler/rustc_middle/src/ty/structural_impls.rs b/compiler/rustc_middle/src/ty/structural_impls.rs
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index 000000000..7660a2f3a
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+++ b/compiler/rustc_middle/src/ty/structural_impls.rs
@@ -0,0 +1,1304 @@
+//! This module contains implements of the `Lift` and `TypeFoldable`
+//! traits for various types in the Rust compiler. Most are written by
+//! hand, though we've recently added some macros and proc-macros to help with the tedium.
+
+use crate::mir::interpret;
+use crate::mir::ProjectionKind;
+use crate::ty::fold::{FallibleTypeFolder, TypeFoldable, TypeSuperFoldable};
+use crate::ty::print::{with_no_trimmed_paths, FmtPrinter, Printer};
+use crate::ty::visit::{TypeSuperVisitable, TypeVisitable, TypeVisitor};
+use crate::ty::{self, InferConst, Lift, Term, Ty, TyCtxt};
+use rustc_data_structures::functor::IdFunctor;
+use rustc_hir as hir;
+use rustc_hir::def::Namespace;
+use rustc_index::vec::{Idx, IndexVec};
+
+use std::fmt;
+use std::mem::ManuallyDrop;
+use std::ops::ControlFlow;
+use std::rc::Rc;
+use std::sync::Arc;
+
+impl fmt::Debug for ty::TraitDef {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ ty::tls::with(|tcx| {
+ with_no_trimmed_paths!({
+ f.write_str(
+ &FmtPrinter::new(tcx, Namespace::TypeNS)
+ .print_def_path(self.def_id, &[])?
+ .into_buffer(),
+ )
+ })
+ })
+ }
+}
+
+impl<'tcx> fmt::Debug for ty::AdtDef<'tcx> {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ ty::tls::with(|tcx| {
+ with_no_trimmed_paths!({
+ f.write_str(
+ &FmtPrinter::new(tcx, Namespace::TypeNS)
+ .print_def_path(self.did(), &[])?
+ .into_buffer(),
+ )
+ })
+ })
+ }
+}
+
+impl fmt::Debug for ty::UpvarId {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ let name = ty::tls::with(|tcx| tcx.hir().name(self.var_path.hir_id));
+ write!(f, "UpvarId({:?};`{}`;{:?})", self.var_path.hir_id, name, self.closure_expr_id)
+ }
+}
+
+impl<'tcx> fmt::Debug for ty::ExistentialTraitRef<'tcx> {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ with_no_trimmed_paths!(fmt::Display::fmt(self, f))
+ }
+}
+
+impl<'tcx> fmt::Debug for ty::adjustment::Adjustment<'tcx> {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ write!(f, "{:?} -> {}", self.kind, self.target)
+ }
+}
+
+impl fmt::Debug for ty::BoundRegionKind {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ match *self {
+ ty::BrAnon(n) => write!(f, "BrAnon({:?})", n),
+ ty::BrNamed(did, name) => {
+ if did.is_crate_root() {
+ write!(f, "BrNamed({})", name)
+ } else {
+ write!(f, "BrNamed({:?}, {})", did, name)
+ }
+ }
+ ty::BrEnv => write!(f, "BrEnv"),
+ }
+ }
+}
+
+impl fmt::Debug for ty::FreeRegion {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ write!(f, "ReFree({:?}, {:?})", self.scope, self.bound_region)
+ }
+}
+
+impl<'tcx> fmt::Debug for ty::FnSig<'tcx> {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ write!(f, "({:?}; c_variadic: {})->{:?}", self.inputs(), self.c_variadic, self.output())
+ }
+}
+
+impl<'tcx> fmt::Debug for ty::ConstVid<'tcx> {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ write!(f, "_#{}c", self.index)
+ }
+}
+
+impl fmt::Debug for ty::RegionVid {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ write!(f, "'_#{}r", self.index())
+ }
+}
+
+impl<'tcx> fmt::Debug for ty::TraitRef<'tcx> {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ with_no_trimmed_paths!(fmt::Display::fmt(self, f))
+ }
+}
+
+impl<'tcx> fmt::Debug for Ty<'tcx> {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ with_no_trimmed_paths!(fmt::Display::fmt(self, f))
+ }
+}
+
+impl fmt::Debug for ty::ParamTy {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ write!(f, "{}/#{}", self.name, self.index)
+ }
+}
+
+impl fmt::Debug for ty::ParamConst {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ write!(f, "{}/#{}", self.name, self.index)
+ }
+}
+
+impl<'tcx> fmt::Debug for ty::TraitPredicate<'tcx> {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ if let ty::BoundConstness::ConstIfConst = self.constness {
+ write!(f, "~const ")?;
+ }
+ write!(f, "TraitPredicate({:?}, polarity:{:?})", self.trait_ref, self.polarity)
+ }
+}
+
+impl<'tcx> fmt::Debug for ty::ProjectionPredicate<'tcx> {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ write!(f, "ProjectionPredicate({:?}, {:?})", self.projection_ty, self.term)
+ }
+}
+
+impl<'tcx> fmt::Debug for ty::Predicate<'tcx> {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ write!(f, "{:?}", self.kind())
+ }
+}
+
+impl<'tcx> fmt::Debug for ty::PredicateKind<'tcx> {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ match *self {
+ ty::PredicateKind::Trait(ref a) => a.fmt(f),
+ ty::PredicateKind::Subtype(ref pair) => pair.fmt(f),
+ ty::PredicateKind::Coerce(ref pair) => pair.fmt(f),
+ ty::PredicateKind::RegionOutlives(ref pair) => pair.fmt(f),
+ ty::PredicateKind::TypeOutlives(ref pair) => pair.fmt(f),
+ ty::PredicateKind::Projection(ref pair) => pair.fmt(f),
+ ty::PredicateKind::WellFormed(data) => write!(f, "WellFormed({:?})", data),
+ ty::PredicateKind::ObjectSafe(trait_def_id) => {
+ write!(f, "ObjectSafe({:?})", trait_def_id)
+ }
+ ty::PredicateKind::ClosureKind(closure_def_id, closure_substs, kind) => {
+ write!(f, "ClosureKind({:?}, {:?}, {:?})", closure_def_id, closure_substs, kind)
+ }
+ ty::PredicateKind::ConstEvaluatable(uv) => {
+ write!(f, "ConstEvaluatable({:?}, {:?})", uv.def, uv.substs)
+ }
+ ty::PredicateKind::ConstEquate(c1, c2) => write!(f, "ConstEquate({:?}, {:?})", c1, c2),
+ ty::PredicateKind::TypeWellFormedFromEnv(ty) => {
+ write!(f, "TypeWellFormedFromEnv({:?})", ty)
+ }
+ }
+ }
+}
+
+///////////////////////////////////////////////////////////////////////////
+// Atomic structs
+//
+// For things that don't carry any arena-allocated data (and are
+// copy...), just add them to this list.
+
+TrivialTypeTraversalAndLiftImpls! {
+ (),
+ bool,
+ usize,
+ ::rustc_target::abi::VariantIdx,
+ u32,
+ u64,
+ String,
+ crate::middle::region::Scope,
+ crate::ty::FloatTy,
+ ::rustc_ast::InlineAsmOptions,
+ ::rustc_ast::InlineAsmTemplatePiece,
+ ::rustc_ast::NodeId,
+ ::rustc_span::symbol::Symbol,
+ ::rustc_hir::def::Res,
+ ::rustc_hir::def_id::DefId,
+ ::rustc_hir::def_id::LocalDefId,
+ ::rustc_hir::HirId,
+ ::rustc_hir::MatchSource,
+ ::rustc_hir::Mutability,
+ ::rustc_hir::Unsafety,
+ ::rustc_target::asm::InlineAsmRegOrRegClass,
+ ::rustc_target::spec::abi::Abi,
+ crate::mir::coverage::ExpressionOperandId,
+ crate::mir::coverage::CounterValueReference,
+ crate::mir::coverage::InjectedExpressionId,
+ crate::mir::coverage::InjectedExpressionIndex,
+ crate::mir::coverage::MappedExpressionIndex,
+ crate::mir::Local,
+ crate::mir::Promoted,
+ crate::traits::Reveal,
+ crate::ty::adjustment::AutoBorrowMutability,
+ crate::ty::AdtKind,
+ crate::ty::BoundConstness,
+ // Including `BoundRegionKind` is a *bit* dubious, but direct
+ // references to bound region appear in `ty::Error`, and aren't
+ // really meant to be folded. In general, we can only fold a fully
+ // general `Region`.
+ crate::ty::BoundRegionKind,
+ crate::ty::AssocItem,
+ crate::ty::AssocKind,
+ crate::ty::Placeholder<crate::ty::BoundRegionKind>,
+ crate::ty::ClosureKind,
+ crate::ty::FreeRegion,
+ crate::ty::InferTy,
+ crate::ty::IntVarValue,
+ crate::ty::ParamConst,
+ crate::ty::ParamTy,
+ crate::ty::adjustment::PointerCast,
+ crate::ty::RegionVid,
+ crate::ty::UniverseIndex,
+ crate::ty::Variance,
+ ::rustc_span::Span,
+ ::rustc_errors::ErrorGuaranteed,
+}
+
+///////////////////////////////////////////////////////////////////////////
+// Lift implementations
+
+// FIXME(eddyb) replace all the uses of `Option::map` with `?`.
+impl<'tcx, A: Lift<'tcx>, B: Lift<'tcx>> Lift<'tcx> for (A, B) {
+ type Lifted = (A::Lifted, B::Lifted);
+ fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
+ Some((tcx.lift(self.0)?, tcx.lift(self.1)?))
+ }
+}
+
+impl<'tcx, A: Lift<'tcx>, B: Lift<'tcx>, C: Lift<'tcx>> Lift<'tcx> for (A, B, C) {
+ type Lifted = (A::Lifted, B::Lifted, C::Lifted);
+ fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
+ Some((tcx.lift(self.0)?, tcx.lift(self.1)?, tcx.lift(self.2)?))
+ }
+}
+
+impl<'tcx, T: Lift<'tcx>> Lift<'tcx> for Option<T> {
+ type Lifted = Option<T::Lifted>;
+ fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
+ match self {
+ Some(x) => tcx.lift(x).map(Some),
+ None => Some(None),
+ }
+ }
+}
+
+impl<'tcx, T: Lift<'tcx>, E: Lift<'tcx>> Lift<'tcx> for Result<T, E> {
+ type Lifted = Result<T::Lifted, E::Lifted>;
+ fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
+ match self {
+ Ok(x) => tcx.lift(x).map(Ok),
+ Err(e) => tcx.lift(e).map(Err),
+ }
+ }
+}
+
+impl<'tcx, T: Lift<'tcx>> Lift<'tcx> for Box<T> {
+ type Lifted = Box<T::Lifted>;
+ fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
+ tcx.lift(*self).map(Box::new)
+ }
+}
+
+impl<'tcx, T: Lift<'tcx> + Clone> Lift<'tcx> for Rc<T> {
+ type Lifted = Rc<T::Lifted>;
+ fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
+ tcx.lift(self.as_ref().clone()).map(Rc::new)
+ }
+}
+
+impl<'tcx, T: Lift<'tcx> + Clone> Lift<'tcx> for Arc<T> {
+ type Lifted = Arc<T::Lifted>;
+ fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
+ tcx.lift(self.as_ref().clone()).map(Arc::new)
+ }
+}
+impl<'tcx, T: Lift<'tcx>> Lift<'tcx> for Vec<T> {
+ type Lifted = Vec<T::Lifted>;
+ fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
+ self.into_iter().map(|v| tcx.lift(v)).collect()
+ }
+}
+
+impl<'tcx, I: Idx, T: Lift<'tcx>> Lift<'tcx> for IndexVec<I, T> {
+ type Lifted = IndexVec<I, T::Lifted>;
+ fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
+ self.into_iter().map(|e| tcx.lift(e)).collect()
+ }
+}
+
+impl<'a, 'tcx> Lift<'tcx> for ty::TraitRef<'a> {
+ type Lifted = ty::TraitRef<'tcx>;
+ fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
+ tcx.lift(self.substs).map(|substs| ty::TraitRef { def_id: self.def_id, substs })
+ }
+}
+
+impl<'a, 'tcx> Lift<'tcx> for ty::ExistentialTraitRef<'a> {
+ type Lifted = ty::ExistentialTraitRef<'tcx>;
+ fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
+ tcx.lift(self.substs).map(|substs| ty::ExistentialTraitRef { def_id: self.def_id, substs })
+ }
+}
+
+impl<'a, 'tcx> Lift<'tcx> for ty::ExistentialPredicate<'a> {
+ type Lifted = ty::ExistentialPredicate<'tcx>;
+ fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
+ match self {
+ ty::ExistentialPredicate::Trait(x) => tcx.lift(x).map(ty::ExistentialPredicate::Trait),
+ ty::ExistentialPredicate::Projection(x) => {
+ tcx.lift(x).map(ty::ExistentialPredicate::Projection)
+ }
+ ty::ExistentialPredicate::AutoTrait(def_id) => {
+ Some(ty::ExistentialPredicate::AutoTrait(def_id))
+ }
+ }
+ }
+}
+
+impl<'a, 'tcx> Lift<'tcx> for Term<'a> {
+ type Lifted = ty::Term<'tcx>;
+ fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
+ Some(match self {
+ Term::Ty(ty) => Term::Ty(tcx.lift(ty)?),
+ Term::Const(c) => Term::Const(tcx.lift(c)?),
+ })
+ }
+}
+
+impl<'a, 'tcx> Lift<'tcx> for ty::TraitPredicate<'a> {
+ type Lifted = ty::TraitPredicate<'tcx>;
+ fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<ty::TraitPredicate<'tcx>> {
+ tcx.lift(self.trait_ref).map(|trait_ref| ty::TraitPredicate {
+ trait_ref,
+ constness: self.constness,
+ polarity: self.polarity,
+ })
+ }
+}
+
+impl<'a, 'tcx> Lift<'tcx> for ty::SubtypePredicate<'a> {
+ type Lifted = ty::SubtypePredicate<'tcx>;
+ fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<ty::SubtypePredicate<'tcx>> {
+ tcx.lift((self.a, self.b)).map(|(a, b)| ty::SubtypePredicate {
+ a_is_expected: self.a_is_expected,
+ a,
+ b,
+ })
+ }
+}
+
+impl<'a, 'tcx> Lift<'tcx> for ty::CoercePredicate<'a> {
+ type Lifted = ty::CoercePredicate<'tcx>;
+ fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<ty::CoercePredicate<'tcx>> {
+ tcx.lift((self.a, self.b)).map(|(a, b)| ty::CoercePredicate { a, b })
+ }
+}
+
+impl<'tcx, A: Copy + Lift<'tcx>, B: Copy + Lift<'tcx>> Lift<'tcx> for ty::OutlivesPredicate<A, B> {
+ type Lifted = ty::OutlivesPredicate<A::Lifted, B::Lifted>;
+ fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
+ tcx.lift((self.0, self.1)).map(|(a, b)| ty::OutlivesPredicate(a, b))
+ }
+}
+
+impl<'a, 'tcx> Lift<'tcx> for ty::ProjectionTy<'a> {
+ type Lifted = ty::ProjectionTy<'tcx>;
+ fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<ty::ProjectionTy<'tcx>> {
+ tcx.lift(self.substs)
+ .map(|substs| ty::ProjectionTy { item_def_id: self.item_def_id, substs })
+ }
+}
+
+impl<'a, 'tcx> Lift<'tcx> for ty::ProjectionPredicate<'a> {
+ type Lifted = ty::ProjectionPredicate<'tcx>;
+ fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<ty::ProjectionPredicate<'tcx>> {
+ tcx.lift((self.projection_ty, self.term))
+ .map(|(projection_ty, term)| ty::ProjectionPredicate { projection_ty, term })
+ }
+}
+
+impl<'a, 'tcx> Lift<'tcx> for ty::ExistentialProjection<'a> {
+ type Lifted = ty::ExistentialProjection<'tcx>;
+ fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
+ tcx.lift(self.substs).map(|substs| ty::ExistentialProjection {
+ substs,
+ term: tcx.lift(self.term).expect("type must lift when substs do"),
+ item_def_id: self.item_def_id,
+ })
+ }
+}
+
+impl<'a, 'tcx> Lift<'tcx> for ty::PredicateKind<'a> {
+ type Lifted = ty::PredicateKind<'tcx>;
+ fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
+ match self {
+ ty::PredicateKind::Trait(data) => tcx.lift(data).map(ty::PredicateKind::Trait),
+ ty::PredicateKind::Subtype(data) => tcx.lift(data).map(ty::PredicateKind::Subtype),
+ ty::PredicateKind::Coerce(data) => tcx.lift(data).map(ty::PredicateKind::Coerce),
+ ty::PredicateKind::RegionOutlives(data) => {
+ tcx.lift(data).map(ty::PredicateKind::RegionOutlives)
+ }
+ ty::PredicateKind::TypeOutlives(data) => {
+ tcx.lift(data).map(ty::PredicateKind::TypeOutlives)
+ }
+ ty::PredicateKind::Projection(data) => {
+ tcx.lift(data).map(ty::PredicateKind::Projection)
+ }
+ ty::PredicateKind::WellFormed(ty) => tcx.lift(ty).map(ty::PredicateKind::WellFormed),
+ ty::PredicateKind::ClosureKind(closure_def_id, closure_substs, kind) => {
+ tcx.lift(closure_substs).map(|closure_substs| {
+ ty::PredicateKind::ClosureKind(closure_def_id, closure_substs, kind)
+ })
+ }
+ ty::PredicateKind::ObjectSafe(trait_def_id) => {
+ Some(ty::PredicateKind::ObjectSafe(trait_def_id))
+ }
+ ty::PredicateKind::ConstEvaluatable(uv) => {
+ tcx.lift(uv).map(|uv| ty::PredicateKind::ConstEvaluatable(uv))
+ }
+ ty::PredicateKind::ConstEquate(c1, c2) => {
+ tcx.lift((c1, c2)).map(|(c1, c2)| ty::PredicateKind::ConstEquate(c1, c2))
+ }
+ ty::PredicateKind::TypeWellFormedFromEnv(ty) => {
+ tcx.lift(ty).map(ty::PredicateKind::TypeWellFormedFromEnv)
+ }
+ }
+ }
+}
+
+impl<'a, 'tcx, T: Lift<'tcx>> Lift<'tcx> for ty::Binder<'a, T>
+where
+ <T as Lift<'tcx>>::Lifted: TypeVisitable<'tcx>,
+{
+ type Lifted = ty::Binder<'tcx, T::Lifted>;
+ fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
+ let bound_vars = tcx.lift(self.bound_vars());
+ tcx.lift(self.skip_binder())
+ .zip(bound_vars)
+ .map(|(value, vars)| ty::Binder::bind_with_vars(value, vars))
+ }
+}
+
+impl<'a, 'tcx> Lift<'tcx> for ty::ParamEnv<'a> {
+ type Lifted = ty::ParamEnv<'tcx>;
+ fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
+ tcx.lift(self.caller_bounds())
+ .map(|caller_bounds| ty::ParamEnv::new(caller_bounds, self.reveal(), self.constness()))
+ }
+}
+
+impl<'a, 'tcx, T: Lift<'tcx>> Lift<'tcx> for ty::ParamEnvAnd<'a, T> {
+ type Lifted = ty::ParamEnvAnd<'tcx, T::Lifted>;
+ fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
+ tcx.lift(self.param_env).and_then(|param_env| {
+ tcx.lift(self.value).map(|value| ty::ParamEnvAnd { param_env, value })
+ })
+ }
+}
+
+impl<'a, 'tcx> Lift<'tcx> for ty::ClosureSubsts<'a> {
+ type Lifted = ty::ClosureSubsts<'tcx>;
+ fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
+ tcx.lift(self.substs).map(|substs| ty::ClosureSubsts { substs })
+ }
+}
+
+impl<'a, 'tcx> Lift<'tcx> for ty::GeneratorSubsts<'a> {
+ type Lifted = ty::GeneratorSubsts<'tcx>;
+ fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
+ tcx.lift(self.substs).map(|substs| ty::GeneratorSubsts { substs })
+ }
+}
+
+impl<'a, 'tcx> Lift<'tcx> for ty::adjustment::Adjustment<'a> {
+ type Lifted = ty::adjustment::Adjustment<'tcx>;
+ fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
+ let ty::adjustment::Adjustment { kind, target } = self;
+ tcx.lift(kind).and_then(|kind| {
+ tcx.lift(target).map(|target| ty::adjustment::Adjustment { kind, target })
+ })
+ }
+}
+
+impl<'a, 'tcx> Lift<'tcx> for ty::adjustment::Adjust<'a> {
+ type Lifted = ty::adjustment::Adjust<'tcx>;
+ fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
+ match self {
+ ty::adjustment::Adjust::NeverToAny => Some(ty::adjustment::Adjust::NeverToAny),
+ ty::adjustment::Adjust::Pointer(ptr) => Some(ty::adjustment::Adjust::Pointer(ptr)),
+ ty::adjustment::Adjust::Deref(overloaded) => {
+ tcx.lift(overloaded).map(ty::adjustment::Adjust::Deref)
+ }
+ ty::adjustment::Adjust::Borrow(autoref) => {
+ tcx.lift(autoref).map(ty::adjustment::Adjust::Borrow)
+ }
+ }
+ }
+}
+
+impl<'a, 'tcx> Lift<'tcx> for ty::adjustment::OverloadedDeref<'a> {
+ type Lifted = ty::adjustment::OverloadedDeref<'tcx>;
+ fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
+ tcx.lift(self.region).map(|region| ty::adjustment::OverloadedDeref {
+ region,
+ mutbl: self.mutbl,
+ span: self.span,
+ })
+ }
+}
+
+impl<'a, 'tcx> Lift<'tcx> for ty::adjustment::AutoBorrow<'a> {
+ type Lifted = ty::adjustment::AutoBorrow<'tcx>;
+ fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
+ match self {
+ ty::adjustment::AutoBorrow::Ref(r, m) => {
+ tcx.lift(r).map(|r| ty::adjustment::AutoBorrow::Ref(r, m))
+ }
+ ty::adjustment::AutoBorrow::RawPtr(m) => Some(ty::adjustment::AutoBorrow::RawPtr(m)),
+ }
+ }
+}
+
+impl<'a, 'tcx> Lift<'tcx> for ty::GenSig<'a> {
+ type Lifted = ty::GenSig<'tcx>;
+ fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
+ tcx.lift((self.resume_ty, self.yield_ty, self.return_ty))
+ .map(|(resume_ty, yield_ty, return_ty)| ty::GenSig { resume_ty, yield_ty, return_ty })
+ }
+}
+
+impl<'a, 'tcx> Lift<'tcx> for ty::FnSig<'a> {
+ type Lifted = ty::FnSig<'tcx>;
+ fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
+ tcx.lift(self.inputs_and_output).map(|x| ty::FnSig {
+ inputs_and_output: x,
+ c_variadic: self.c_variadic,
+ unsafety: self.unsafety,
+ abi: self.abi,
+ })
+ }
+}
+
+impl<'tcx, T: Lift<'tcx>> Lift<'tcx> for ty::error::ExpectedFound<T> {
+ type Lifted = ty::error::ExpectedFound<T::Lifted>;
+ fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
+ let ty::error::ExpectedFound { expected, found } = self;
+ tcx.lift(expected).and_then(|expected| {
+ tcx.lift(found).map(|found| ty::error::ExpectedFound { expected, found })
+ })
+ }
+}
+
+impl<'a, 'tcx> Lift<'tcx> for ty::error::TypeError<'a> {
+ type Lifted = ty::error::TypeError<'tcx>;
+ fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
+ use crate::ty::error::TypeError::*;
+
+ Some(match self {
+ Mismatch => Mismatch,
+ ConstnessMismatch(x) => ConstnessMismatch(x),
+ PolarityMismatch(x) => PolarityMismatch(x),
+ UnsafetyMismatch(x) => UnsafetyMismatch(x),
+ AbiMismatch(x) => AbiMismatch(x),
+ Mutability => Mutability,
+ ArgumentMutability(i) => ArgumentMutability(i),
+ TupleSize(x) => TupleSize(x),
+ FixedArraySize(x) => FixedArraySize(x),
+ ArgCount => ArgCount,
+ FieldMisMatch(x, y) => FieldMisMatch(x, y),
+ RegionsDoesNotOutlive(a, b) => {
+ return tcx.lift((a, b)).map(|(a, b)| RegionsDoesNotOutlive(a, b));
+ }
+ RegionsInsufficientlyPolymorphic(a, b) => {
+ return tcx.lift(b).map(|b| RegionsInsufficientlyPolymorphic(a, b));
+ }
+ RegionsOverlyPolymorphic(a, b) => {
+ return tcx.lift(b).map(|b| RegionsOverlyPolymorphic(a, b));
+ }
+ RegionsPlaceholderMismatch => RegionsPlaceholderMismatch,
+ IntMismatch(x) => IntMismatch(x),
+ FloatMismatch(x) => FloatMismatch(x),
+ Traits(x) => Traits(x),
+ VariadicMismatch(x) => VariadicMismatch(x),
+ CyclicTy(t) => return tcx.lift(t).map(|t| CyclicTy(t)),
+ CyclicConst(ct) => return tcx.lift(ct).map(|ct| CyclicConst(ct)),
+ ProjectionMismatched(x) => ProjectionMismatched(x),
+ ArgumentSorts(x, i) => return tcx.lift(x).map(|x| ArgumentSorts(x, i)),
+ Sorts(x) => return tcx.lift(x).map(Sorts),
+ ExistentialMismatch(x) => return tcx.lift(x).map(ExistentialMismatch),
+ ConstMismatch(x) => return tcx.lift(x).map(ConstMismatch),
+ IntrinsicCast => IntrinsicCast,
+ TargetFeatureCast(x) => TargetFeatureCast(x),
+ ObjectUnsafeCoercion(x) => return tcx.lift(x).map(ObjectUnsafeCoercion),
+ })
+ }
+}
+
+impl<'a, 'tcx> Lift<'tcx> for ty::InstanceDef<'a> {
+ type Lifted = ty::InstanceDef<'tcx>;
+ fn lift_to_tcx(self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
+ match self {
+ ty::InstanceDef::Item(def_id) => Some(ty::InstanceDef::Item(def_id)),
+ ty::InstanceDef::VTableShim(def_id) => Some(ty::InstanceDef::VTableShim(def_id)),
+ ty::InstanceDef::ReifyShim(def_id) => Some(ty::InstanceDef::ReifyShim(def_id)),
+ ty::InstanceDef::Intrinsic(def_id) => Some(ty::InstanceDef::Intrinsic(def_id)),
+ ty::InstanceDef::FnPtrShim(def_id, ty) => {
+ Some(ty::InstanceDef::FnPtrShim(def_id, tcx.lift(ty)?))
+ }
+ ty::InstanceDef::Virtual(def_id, n) => Some(ty::InstanceDef::Virtual(def_id, n)),
+ ty::InstanceDef::ClosureOnceShim { call_once, track_caller } => {
+ Some(ty::InstanceDef::ClosureOnceShim { call_once, track_caller })
+ }
+ ty::InstanceDef::DropGlue(def_id, ty) => {
+ Some(ty::InstanceDef::DropGlue(def_id, tcx.lift(ty)?))
+ }
+ ty::InstanceDef::CloneShim(def_id, ty) => {
+ Some(ty::InstanceDef::CloneShim(def_id, tcx.lift(ty)?))
+ }
+ }
+ }
+}
+
+///////////////////////////////////////////////////////////////////////////
+// TypeFoldable implementations.
+
+/// AdtDefs are basically the same as a DefId.
+impl<'tcx> TypeFoldable<'tcx> for ty::AdtDef<'tcx> {
+ fn try_fold_with<F: FallibleTypeFolder<'tcx>>(self, _folder: &mut F) -> Result<Self, F::Error> {
+ Ok(self)
+ }
+}
+
+impl<'tcx> TypeVisitable<'tcx> for ty::AdtDef<'tcx> {
+ fn visit_with<V: TypeVisitor<'tcx>>(&self, _visitor: &mut V) -> ControlFlow<V::BreakTy> {
+ ControlFlow::CONTINUE
+ }
+}
+
+impl<'tcx, T: TypeFoldable<'tcx>, U: TypeFoldable<'tcx>> TypeFoldable<'tcx> for (T, U) {
+ fn try_fold_with<F: FallibleTypeFolder<'tcx>>(
+ self,
+ folder: &mut F,
+ ) -> Result<(T, U), F::Error> {
+ Ok((self.0.try_fold_with(folder)?, self.1.try_fold_with(folder)?))
+ }
+}
+
+impl<'tcx, T: TypeVisitable<'tcx>, U: TypeVisitable<'tcx>> TypeVisitable<'tcx> for (T, U) {
+ fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
+ self.0.visit_with(visitor)?;
+ self.1.visit_with(visitor)
+ }
+}
+
+impl<'tcx, A: TypeFoldable<'tcx>, B: TypeFoldable<'tcx>, C: TypeFoldable<'tcx>> TypeFoldable<'tcx>
+ for (A, B, C)
+{
+ fn try_fold_with<F: FallibleTypeFolder<'tcx>>(
+ self,
+ folder: &mut F,
+ ) -> Result<(A, B, C), F::Error> {
+ Ok((
+ self.0.try_fold_with(folder)?,
+ self.1.try_fold_with(folder)?,
+ self.2.try_fold_with(folder)?,
+ ))
+ }
+}
+
+impl<'tcx, A: TypeVisitable<'tcx>, B: TypeVisitable<'tcx>, C: TypeVisitable<'tcx>>
+ TypeVisitable<'tcx> for (A, B, C)
+{
+ fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
+ self.0.visit_with(visitor)?;
+ self.1.visit_with(visitor)?;
+ self.2.visit_with(visitor)
+ }
+}
+
+EnumTypeTraversalImpl! {
+ impl<'tcx, T> TypeFoldable<'tcx> for Option<T> {
+ (Some)(a),
+ (None),
+ } where T: TypeFoldable<'tcx>
+}
+EnumTypeTraversalImpl! {
+ impl<'tcx, T> TypeVisitable<'tcx> for Option<T> {
+ (Some)(a),
+ (None),
+ } where T: TypeVisitable<'tcx>
+}
+
+EnumTypeTraversalImpl! {
+ impl<'tcx, T, E> TypeFoldable<'tcx> for Result<T, E> {
+ (Ok)(a),
+ (Err)(a),
+ } where T: TypeFoldable<'tcx>, E: TypeFoldable<'tcx>,
+}
+EnumTypeTraversalImpl! {
+ impl<'tcx, T, E> TypeVisitable<'tcx> for Result<T, E> {
+ (Ok)(a),
+ (Err)(a),
+ } where T: TypeVisitable<'tcx>, E: TypeVisitable<'tcx>,
+}
+
+impl<'tcx, T: TypeFoldable<'tcx>> TypeFoldable<'tcx> for Rc<T> {
+ fn try_fold_with<F: FallibleTypeFolder<'tcx>>(
+ mut self,
+ folder: &mut F,
+ ) -> Result<Self, F::Error> {
+ // We merely want to replace the contained `T`, if at all possible,
+ // so that we don't needlessly allocate a new `Rc` or indeed clone
+ // the contained type.
+ unsafe {
+ // First step is to ensure that we have a unique reference to
+ // the contained type, which `Rc::make_mut` will accomplish (by
+ // allocating a new `Rc` and cloning the `T` only if required).
+ // This is done *before* casting to `Rc<ManuallyDrop<T>>` so that
+ // panicking during `make_mut` does not leak the `T`.
+ Rc::make_mut(&mut self);
+
+ // Casting to `Rc<ManuallyDrop<T>>` is safe because `ManuallyDrop`
+ // is `repr(transparent)`.
+ let ptr = Rc::into_raw(self).cast::<ManuallyDrop<T>>();
+ let mut unique = Rc::from_raw(ptr);
+
+ // Call to `Rc::make_mut` above guarantees that `unique` is the
+ // sole reference to the contained value, so we can avoid doing
+ // a checked `get_mut` here.
+ let slot = Rc::get_mut_unchecked(&mut unique);
+
+ // Semantically move the contained type out from `unique`, fold
+ // it, then move the folded value back into `unique`. Should
+ // folding fail, `ManuallyDrop` ensures that the "moved-out"
+ // value is not re-dropped.
+ let owned = ManuallyDrop::take(slot);
+ let folded = owned.try_fold_with(folder)?;
+ *slot = ManuallyDrop::new(folded);
+
+ // Cast back to `Rc<T>`.
+ Ok(Rc::from_raw(Rc::into_raw(unique).cast()))
+ }
+ }
+}
+
+impl<'tcx, T: TypeVisitable<'tcx>> TypeVisitable<'tcx> for Rc<T> {
+ fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
+ (**self).visit_with(visitor)
+ }
+}
+
+impl<'tcx, T: TypeFoldable<'tcx>> TypeFoldable<'tcx> for Arc<T> {
+ fn try_fold_with<F: FallibleTypeFolder<'tcx>>(
+ mut self,
+ folder: &mut F,
+ ) -> Result<Self, F::Error> {
+ // We merely want to replace the contained `T`, if at all possible,
+ // so that we don't needlessly allocate a new `Arc` or indeed clone
+ // the contained type.
+ unsafe {
+ // First step is to ensure that we have a unique reference to
+ // the contained type, which `Arc::make_mut` will accomplish (by
+ // allocating a new `Arc` and cloning the `T` only if required).
+ // This is done *before* casting to `Arc<ManuallyDrop<T>>` so that
+ // panicking during `make_mut` does not leak the `T`.
+ Arc::make_mut(&mut self);
+
+ // Casting to `Arc<ManuallyDrop<T>>` is safe because `ManuallyDrop`
+ // is `repr(transparent)`.
+ let ptr = Arc::into_raw(self).cast::<ManuallyDrop<T>>();
+ let mut unique = Arc::from_raw(ptr);
+
+ // Call to `Arc::make_mut` above guarantees that `unique` is the
+ // sole reference to the contained value, so we can avoid doing
+ // a checked `get_mut` here.
+ let slot = Arc::get_mut_unchecked(&mut unique);
+
+ // Semantically move the contained type out from `unique`, fold
+ // it, then move the folded value back into `unique`. Should
+ // folding fail, `ManuallyDrop` ensures that the "moved-out"
+ // value is not re-dropped.
+ let owned = ManuallyDrop::take(slot);
+ let folded = owned.try_fold_with(folder)?;
+ *slot = ManuallyDrop::new(folded);
+
+ // Cast back to `Arc<T>`.
+ Ok(Arc::from_raw(Arc::into_raw(unique).cast()))
+ }
+ }
+}
+
+impl<'tcx, T: TypeVisitable<'tcx>> TypeVisitable<'tcx> for Arc<T> {
+ fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
+ (**self).visit_with(visitor)
+ }
+}
+
+impl<'tcx, T: TypeFoldable<'tcx>> TypeFoldable<'tcx> for Box<T> {
+ fn try_fold_with<F: FallibleTypeFolder<'tcx>>(self, folder: &mut F) -> Result<Self, F::Error> {
+ self.try_map_id(|value| value.try_fold_with(folder))
+ }
+}
+
+impl<'tcx, T: TypeVisitable<'tcx>> TypeVisitable<'tcx> for Box<T> {
+ fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
+ (**self).visit_with(visitor)
+ }
+}
+
+impl<'tcx, T: TypeFoldable<'tcx>> TypeFoldable<'tcx> for Vec<T> {
+ fn try_fold_with<F: FallibleTypeFolder<'tcx>>(self, folder: &mut F) -> Result<Self, F::Error> {
+ self.try_map_id(|t| t.try_fold_with(folder))
+ }
+}
+
+impl<'tcx, T: TypeVisitable<'tcx>> TypeVisitable<'tcx> for Vec<T> {
+ fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
+ self.iter().try_for_each(|t| t.visit_with(visitor))
+ }
+}
+
+impl<'tcx, T: TypeFoldable<'tcx>> TypeFoldable<'tcx> for Box<[T]> {
+ fn try_fold_with<F: FallibleTypeFolder<'tcx>>(self, folder: &mut F) -> Result<Self, F::Error> {
+ self.try_map_id(|t| t.try_fold_with(folder))
+ }
+}
+
+impl<'tcx, T: TypeVisitable<'tcx>> TypeVisitable<'tcx> for Box<[T]> {
+ fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
+ self.iter().try_for_each(|t| t.visit_with(visitor))
+ }
+}
+
+impl<'tcx, T: TypeFoldable<'tcx>> TypeFoldable<'tcx> for ty::EarlyBinder<T> {
+ fn try_fold_with<F: FallibleTypeFolder<'tcx>>(self, folder: &mut F) -> Result<Self, F::Error> {
+ self.try_map_bound(|ty| ty.try_fold_with(folder))
+ }
+}
+
+impl<'tcx, T: TypeVisitable<'tcx>> TypeVisitable<'tcx> for ty::EarlyBinder<T> {
+ fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
+ self.as_ref().0.visit_with(visitor)
+ }
+}
+
+impl<'tcx, T: TypeFoldable<'tcx>> TypeFoldable<'tcx> for ty::Binder<'tcx, T> {
+ fn try_fold_with<F: FallibleTypeFolder<'tcx>>(self, folder: &mut F) -> Result<Self, F::Error> {
+ folder.try_fold_binder(self)
+ }
+}
+
+impl<'tcx, T: TypeVisitable<'tcx>> TypeVisitable<'tcx> for ty::Binder<'tcx, T> {
+ fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
+ visitor.visit_binder(self)
+ }
+}
+
+impl<'tcx, T: TypeFoldable<'tcx>> TypeSuperFoldable<'tcx> for ty::Binder<'tcx, T> {
+ fn try_super_fold_with<F: FallibleTypeFolder<'tcx>>(
+ self,
+ folder: &mut F,
+ ) -> Result<Self, F::Error> {
+ self.try_map_bound(|ty| ty.try_fold_with(folder))
+ }
+}
+
+impl<'tcx, T: TypeVisitable<'tcx>> TypeSuperVisitable<'tcx> for ty::Binder<'tcx, T> {
+ fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
+ self.as_ref().skip_binder().visit_with(visitor)
+ }
+}
+
+impl<'tcx> TypeFoldable<'tcx> for &'tcx ty::List<ty::Binder<'tcx, ty::ExistentialPredicate<'tcx>>> {
+ fn try_fold_with<F: FallibleTypeFolder<'tcx>>(self, folder: &mut F) -> Result<Self, F::Error> {
+ ty::util::fold_list(self, folder, |tcx, v| tcx.intern_poly_existential_predicates(v))
+ }
+}
+
+impl<'tcx> TypeVisitable<'tcx>
+ for &'tcx ty::List<ty::Binder<'tcx, ty::ExistentialPredicate<'tcx>>>
+{
+ fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
+ self.iter().try_for_each(|p| p.visit_with(visitor))
+ }
+}
+
+impl<'tcx> TypeFoldable<'tcx> for &'tcx ty::List<ProjectionKind> {
+ fn try_fold_with<F: FallibleTypeFolder<'tcx>>(self, folder: &mut F) -> Result<Self, F::Error> {
+ ty::util::fold_list(self, folder, |tcx, v| tcx.intern_projs(v))
+ }
+}
+
+impl<'tcx> TypeVisitable<'tcx> for &'tcx ty::List<ProjectionKind> {
+ fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
+ self.iter().try_for_each(|t| t.visit_with(visitor))
+ }
+}
+
+impl<'tcx> TypeFoldable<'tcx> for ty::instance::Instance<'tcx> {
+ fn try_fold_with<F: FallibleTypeFolder<'tcx>>(self, folder: &mut F) -> Result<Self, F::Error> {
+ use crate::ty::InstanceDef::*;
+ Ok(Self {
+ substs: self.substs.try_fold_with(folder)?,
+ def: match self.def {
+ Item(def) => Item(def.try_fold_with(folder)?),
+ VTableShim(did) => VTableShim(did.try_fold_with(folder)?),
+ ReifyShim(did) => ReifyShim(did.try_fold_with(folder)?),
+ Intrinsic(did) => Intrinsic(did.try_fold_with(folder)?),
+ FnPtrShim(did, ty) => {
+ FnPtrShim(did.try_fold_with(folder)?, ty.try_fold_with(folder)?)
+ }
+ Virtual(did, i) => Virtual(did.try_fold_with(folder)?, i),
+ ClosureOnceShim { call_once, track_caller } => {
+ ClosureOnceShim { call_once: call_once.try_fold_with(folder)?, track_caller }
+ }
+ DropGlue(did, ty) => {
+ DropGlue(did.try_fold_with(folder)?, ty.try_fold_with(folder)?)
+ }
+ CloneShim(did, ty) => {
+ CloneShim(did.try_fold_with(folder)?, ty.try_fold_with(folder)?)
+ }
+ },
+ })
+ }
+}
+
+impl<'tcx> TypeVisitable<'tcx> for ty::instance::Instance<'tcx> {
+ fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
+ use crate::ty::InstanceDef::*;
+ self.substs.visit_with(visitor)?;
+ match self.def {
+ Item(def) => def.visit_with(visitor),
+ VTableShim(did) | ReifyShim(did) | Intrinsic(did) | Virtual(did, _) => {
+ did.visit_with(visitor)
+ }
+ FnPtrShim(did, ty) | CloneShim(did, ty) => {
+ did.visit_with(visitor)?;
+ ty.visit_with(visitor)
+ }
+ DropGlue(did, ty) => {
+ did.visit_with(visitor)?;
+ ty.visit_with(visitor)
+ }
+ ClosureOnceShim { call_once, track_caller: _ } => call_once.visit_with(visitor),
+ }
+ }
+}
+
+impl<'tcx> TypeFoldable<'tcx> for interpret::GlobalId<'tcx> {
+ fn try_fold_with<F: FallibleTypeFolder<'tcx>>(self, folder: &mut F) -> Result<Self, F::Error> {
+ Ok(Self { instance: self.instance.try_fold_with(folder)?, promoted: self.promoted })
+ }
+}
+
+impl<'tcx> TypeVisitable<'tcx> for interpret::GlobalId<'tcx> {
+ fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
+ self.instance.visit_with(visitor)
+ }
+}
+
+impl<'tcx> TypeFoldable<'tcx> for Ty<'tcx> {
+ fn try_fold_with<F: FallibleTypeFolder<'tcx>>(self, folder: &mut F) -> Result<Self, F::Error> {
+ folder.try_fold_ty(self)
+ }
+}
+
+impl<'tcx> TypeVisitable<'tcx> for Ty<'tcx> {
+ fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
+ visitor.visit_ty(*self)
+ }
+}
+
+impl<'tcx> TypeSuperFoldable<'tcx> for Ty<'tcx> {
+ fn try_super_fold_with<F: FallibleTypeFolder<'tcx>>(
+ self,
+ folder: &mut F,
+ ) -> Result<Self, F::Error> {
+ let kind = match *self.kind() {
+ ty::RawPtr(tm) => ty::RawPtr(tm.try_fold_with(folder)?),
+ ty::Array(typ, sz) => ty::Array(typ.try_fold_with(folder)?, sz.try_fold_with(folder)?),
+ ty::Slice(typ) => ty::Slice(typ.try_fold_with(folder)?),
+ ty::Adt(tid, substs) => ty::Adt(tid, substs.try_fold_with(folder)?),
+ ty::Dynamic(trait_ty, region) => {
+ ty::Dynamic(trait_ty.try_fold_with(folder)?, region.try_fold_with(folder)?)
+ }
+ ty::Tuple(ts) => ty::Tuple(ts.try_fold_with(folder)?),
+ ty::FnDef(def_id, substs) => ty::FnDef(def_id, substs.try_fold_with(folder)?),
+ ty::FnPtr(f) => ty::FnPtr(f.try_fold_with(folder)?),
+ ty::Ref(r, ty, mutbl) => {
+ ty::Ref(r.try_fold_with(folder)?, ty.try_fold_with(folder)?, mutbl)
+ }
+ ty::Generator(did, substs, movability) => {
+ ty::Generator(did, substs.try_fold_with(folder)?, movability)
+ }
+ ty::GeneratorWitness(types) => ty::GeneratorWitness(types.try_fold_with(folder)?),
+ ty::Closure(did, substs) => ty::Closure(did, substs.try_fold_with(folder)?),
+ ty::Projection(data) => ty::Projection(data.try_fold_with(folder)?),
+ ty::Opaque(did, substs) => ty::Opaque(did, substs.try_fold_with(folder)?),
+
+ ty::Bool
+ | ty::Char
+ | ty::Str
+ | ty::Int(_)
+ | ty::Uint(_)
+ | ty::Float(_)
+ | ty::Error(_)
+ | ty::Infer(_)
+ | ty::Param(..)
+ | ty::Bound(..)
+ | ty::Placeholder(..)
+ | ty::Never
+ | ty::Foreign(..) => return Ok(self),
+ };
+
+ Ok(if *self.kind() == kind { self } else { folder.tcx().mk_ty(kind) })
+ }
+}
+
+impl<'tcx> TypeSuperVisitable<'tcx> for Ty<'tcx> {
+ fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
+ match self.kind() {
+ ty::RawPtr(ref tm) => tm.visit_with(visitor),
+ ty::Array(typ, sz) => {
+ typ.visit_with(visitor)?;
+ sz.visit_with(visitor)
+ }
+ ty::Slice(typ) => typ.visit_with(visitor),
+ ty::Adt(_, substs) => substs.visit_with(visitor),
+ ty::Dynamic(ref trait_ty, ref reg) => {
+ trait_ty.visit_with(visitor)?;
+ reg.visit_with(visitor)
+ }
+ ty::Tuple(ts) => ts.visit_with(visitor),
+ ty::FnDef(_, substs) => substs.visit_with(visitor),
+ ty::FnPtr(ref f) => f.visit_with(visitor),
+ ty::Ref(r, ty, _) => {
+ r.visit_with(visitor)?;
+ ty.visit_with(visitor)
+ }
+ ty::Generator(_did, ref substs, _) => substs.visit_with(visitor),
+ ty::GeneratorWitness(ref types) => types.visit_with(visitor),
+ ty::Closure(_did, ref substs) => substs.visit_with(visitor),
+ ty::Projection(ref data) => data.visit_with(visitor),
+ ty::Opaque(_, ref substs) => substs.visit_with(visitor),
+
+ ty::Bool
+ | ty::Char
+ | ty::Str
+ | ty::Int(_)
+ | ty::Uint(_)
+ | ty::Float(_)
+ | ty::Error(_)
+ | ty::Infer(_)
+ | ty::Bound(..)
+ | ty::Placeholder(..)
+ | ty::Param(..)
+ | ty::Never
+ | ty::Foreign(..) => ControlFlow::CONTINUE,
+ }
+ }
+}
+
+impl<'tcx> TypeFoldable<'tcx> for ty::Region<'tcx> {
+ fn try_fold_with<F: FallibleTypeFolder<'tcx>>(self, folder: &mut F) -> Result<Self, F::Error> {
+ folder.try_fold_region(self)
+ }
+}
+
+impl<'tcx> TypeVisitable<'tcx> for ty::Region<'tcx> {
+ fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
+ visitor.visit_region(*self)
+ }
+}
+
+impl<'tcx> TypeSuperFoldable<'tcx> for ty::Region<'tcx> {
+ fn try_super_fold_with<F: FallibleTypeFolder<'tcx>>(
+ self,
+ _folder: &mut F,
+ ) -> Result<Self, F::Error> {
+ Ok(self)
+ }
+}
+
+impl<'tcx> TypeSuperVisitable<'tcx> for ty::Region<'tcx> {
+ fn super_visit_with<V: TypeVisitor<'tcx>>(&self, _visitor: &mut V) -> ControlFlow<V::BreakTy> {
+ ControlFlow::CONTINUE
+ }
+}
+
+impl<'tcx> TypeFoldable<'tcx> for ty::Predicate<'tcx> {
+ fn try_fold_with<F: FallibleTypeFolder<'tcx>>(self, folder: &mut F) -> Result<Self, F::Error> {
+ folder.try_fold_predicate(self)
+ }
+}
+
+impl<'tcx> TypeVisitable<'tcx> for ty::Predicate<'tcx> {
+ fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
+ visitor.visit_predicate(*self)
+ }
+
+ #[inline]
+ fn has_vars_bound_at_or_above(&self, binder: ty::DebruijnIndex) -> bool {
+ self.outer_exclusive_binder() > binder
+ }
+
+ #[inline]
+ fn has_type_flags(&self, flags: ty::TypeFlags) -> bool {
+ self.flags().intersects(flags)
+ }
+}
+
+impl<'tcx> TypeSuperFoldable<'tcx> for ty::Predicate<'tcx> {
+ fn try_super_fold_with<F: FallibleTypeFolder<'tcx>>(
+ self,
+ folder: &mut F,
+ ) -> Result<Self, F::Error> {
+ let new = self.kind().try_fold_with(folder)?;
+ Ok(folder.tcx().reuse_or_mk_predicate(self, new))
+ }
+}
+
+impl<'tcx> TypeSuperVisitable<'tcx> for ty::Predicate<'tcx> {
+ fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
+ self.kind().visit_with(visitor)
+ }
+}
+
+impl<'tcx> TypeFoldable<'tcx> for &'tcx ty::List<ty::Predicate<'tcx>> {
+ fn try_fold_with<F: FallibleTypeFolder<'tcx>>(self, folder: &mut F) -> Result<Self, F::Error> {
+ ty::util::fold_list(self, folder, |tcx, v| tcx.intern_predicates(v))
+ }
+}
+
+impl<'tcx> TypeVisitable<'tcx> for &'tcx ty::List<ty::Predicate<'tcx>> {
+ fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
+ self.iter().try_for_each(|p| p.visit_with(visitor))
+ }
+}
+
+impl<'tcx, T: TypeFoldable<'tcx>, I: Idx> TypeFoldable<'tcx> for IndexVec<I, T> {
+ fn try_fold_with<F: FallibleTypeFolder<'tcx>>(self, folder: &mut F) -> Result<Self, F::Error> {
+ self.try_map_id(|x| x.try_fold_with(folder))
+ }
+}
+
+impl<'tcx, T: TypeVisitable<'tcx>, I: Idx> TypeVisitable<'tcx> for IndexVec<I, T> {
+ fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
+ self.iter().try_for_each(|t| t.visit_with(visitor))
+ }
+}
+
+impl<'tcx> TypeFoldable<'tcx> for ty::Const<'tcx> {
+ fn try_fold_with<F: FallibleTypeFolder<'tcx>>(self, folder: &mut F) -> Result<Self, F::Error> {
+ folder.try_fold_const(self)
+ }
+}
+
+impl<'tcx> TypeVisitable<'tcx> for ty::Const<'tcx> {
+ fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
+ visitor.visit_const(*self)
+ }
+}
+
+impl<'tcx> TypeSuperFoldable<'tcx> for ty::Const<'tcx> {
+ fn try_super_fold_with<F: FallibleTypeFolder<'tcx>>(
+ self,
+ folder: &mut F,
+ ) -> Result<Self, F::Error> {
+ let ty = self.ty().try_fold_with(folder)?;
+ let kind = self.kind().try_fold_with(folder)?;
+ if ty != self.ty() || kind != self.kind() {
+ Ok(folder.tcx().mk_const(ty::ConstS { ty, kind }))
+ } else {
+ Ok(self)
+ }
+ }
+}
+
+impl<'tcx> TypeSuperVisitable<'tcx> for ty::Const<'tcx> {
+ fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
+ self.ty().visit_with(visitor)?;
+ self.kind().visit_with(visitor)
+ }
+}
+
+impl<'tcx> TypeFoldable<'tcx> for ty::ConstKind<'tcx> {
+ fn try_fold_with<F: FallibleTypeFolder<'tcx>>(self, folder: &mut F) -> Result<Self, F::Error> {
+ Ok(match self {
+ ty::ConstKind::Infer(ic) => ty::ConstKind::Infer(ic.try_fold_with(folder)?),
+ ty::ConstKind::Param(p) => ty::ConstKind::Param(p.try_fold_with(folder)?),
+ ty::ConstKind::Unevaluated(uv) => ty::ConstKind::Unevaluated(uv.try_fold_with(folder)?),
+ ty::ConstKind::Value(_)
+ | ty::ConstKind::Bound(..)
+ | ty::ConstKind::Placeholder(..)
+ | ty::ConstKind::Error(_) => self,
+ })
+ }
+}
+
+impl<'tcx> TypeVisitable<'tcx> for ty::ConstKind<'tcx> {
+ fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
+ match *self {
+ ty::ConstKind::Infer(ic) => ic.visit_with(visitor),
+ ty::ConstKind::Param(p) => p.visit_with(visitor),
+ ty::ConstKind::Unevaluated(uv) => uv.visit_with(visitor),
+ ty::ConstKind::Value(_)
+ | ty::ConstKind::Bound(..)
+ | ty::ConstKind::Placeholder(_)
+ | ty::ConstKind::Error(_) => ControlFlow::CONTINUE,
+ }
+ }
+}
+
+impl<'tcx> TypeFoldable<'tcx> for InferConst<'tcx> {
+ fn try_fold_with<F: FallibleTypeFolder<'tcx>>(self, _folder: &mut F) -> Result<Self, F::Error> {
+ Ok(self)
+ }
+}
+
+impl<'tcx> TypeVisitable<'tcx> for InferConst<'tcx> {
+ fn visit_with<V: TypeVisitor<'tcx>>(&self, _visitor: &mut V) -> ControlFlow<V::BreakTy> {
+ ControlFlow::CONTINUE
+ }
+}
+
+impl<'tcx> TypeFoldable<'tcx> for ty::Unevaluated<'tcx> {
+ fn try_fold_with<F: FallibleTypeFolder<'tcx>>(self, folder: &mut F) -> Result<Self, F::Error> {
+ folder.try_fold_unevaluated(self)
+ }
+}
+
+impl<'tcx> TypeVisitable<'tcx> for ty::Unevaluated<'tcx> {
+ fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
+ visitor.visit_unevaluated(*self)
+ }
+}
+
+impl<'tcx> TypeSuperFoldable<'tcx> for ty::Unevaluated<'tcx> {
+ fn try_super_fold_with<F: FallibleTypeFolder<'tcx>>(
+ self,
+ folder: &mut F,
+ ) -> Result<Self, F::Error> {
+ Ok(ty::Unevaluated {
+ def: self.def,
+ substs: self.substs.try_fold_with(folder)?,
+ promoted: self.promoted,
+ })
+ }
+}
+
+impl<'tcx> TypeSuperVisitable<'tcx> for ty::Unevaluated<'tcx> {
+ fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
+ self.substs.visit_with(visitor)
+ }
+}
+
+impl<'tcx> TypeFoldable<'tcx> for ty::Unevaluated<'tcx, ()> {
+ fn try_fold_with<F: FallibleTypeFolder<'tcx>>(self, folder: &mut F) -> Result<Self, F::Error> {
+ Ok(self.expand().try_fold_with(folder)?.shrink())
+ }
+}
+
+impl<'tcx> TypeVisitable<'tcx> for ty::Unevaluated<'tcx, ()> {
+ fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
+ self.expand().visit_with(visitor)
+ }
+}
+
+impl<'tcx> TypeFoldable<'tcx> for hir::Constness {
+ fn try_fold_with<F: FallibleTypeFolder<'tcx>>(self, _: &mut F) -> Result<Self, F::Error> {
+ Ok(self)
+ }
+}
+
+impl<'tcx> TypeVisitable<'tcx> for hir::Constness {
+ fn visit_with<V: TypeVisitor<'tcx>>(&self, _: &mut V) -> ControlFlow<V::BreakTy> {
+ ControlFlow::CONTINUE
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-12 00:56:41 +0000