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lcnrlcnr
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remove the Subst trait, always use EarlyBinder 
1 parent d398b54 commit 647052f

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73 files changed

+132
-173
lines changed

‎compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs

+1-1
Original file line numberDiff line numberDiff line change
@@ -16,7 +16,7 @@ use rustc_middle::mir::{
1616
FakeReadCause, LocalDecl, LocalInfo, LocalKind, Location, Operand, Place, PlaceRef,
1717
ProjectionElem, Rvalue, Statement, StatementKind, Terminator, TerminatorKind, VarBindingForm,
1818
};
19-
use rustc_middle::ty::{self, subst::Subst, suggest_constraining_type_params, PredicateKind, Ty};
19+
use rustc_middle::ty::{self, suggest_constraining_type_params, PredicateKind, Ty};
2020
use rustc_mir_dataflow::move_paths::{InitKind, MoveOutIndex, MovePathIndex};
2121
use rustc_span::def_id::LocalDefId;
2222
use rustc_span::hygiene::DesugaringKind;

‎compiler/rustc_borrowck/src/universal_regions.rs

+1-1
Original file line numberDiff line numberDiff line change
@@ -22,8 +22,8 @@ use rustc_hir::{BodyOwnerKind, HirId};
2222
use rustc_index::vec::{Idx, IndexVec};
2323
use rustc_infer::infer::{InferCtxt, NllRegionVariableOrigin};
2424
use rustc_middle::ty::fold::TypeFoldable;
25-
use rustc_middle::ty::subst::{InternalSubsts, Subst, SubstsRef};
2625
use rustc_middle::ty::{self, InlineConstSubsts, InlineConstSubstsParts, RegionVid, Ty, TyCtxt};
26+
use rustc_middle::ty::{InternalSubsts, SubstsRef};
2727
use std::iter;
2828

2929
use crate::nll::ToRegionVid;

‎compiler/rustc_const_eval/src/const_eval/eval_queries.rs

+1-1
Original file line numberDiff line numberDiff line change
@@ -13,7 +13,7 @@ use rustc_middle::mir::pretty::display_allocation;
1313
use rustc_middle::traits::Reveal;
1414
use rustc_middle::ty::layout::LayoutOf;
1515
use rustc_middle::ty::print::with_no_trimmed_paths;
16-
use rustc_middle::ty::{self, subst::Subst, TyCtxt};
16+
use rustc_middle::ty::{self, TyCtxt};
1717
use rustc_span::source_map::Span;
1818
use rustc_target::abi::{self, Abi};
1919
use std::borrow::Cow;

‎compiler/rustc_const_eval/src/interpret/intrinsics/caller_location.rs

-1
Original file line numberDiff line numberDiff line change
@@ -4,7 +4,6 @@ use rustc_ast::Mutability;
44
use rustc_hir::lang_items::LangItem;
55
use rustc_middle::mir::TerminatorKind;
66
use rustc_middle::ty::layout::LayoutOf;
7-
use rustc_middle::ty::subst::Subst;
87
use rustc_span::{Span, Symbol};
98

109
use crate::interpret::{

‎compiler/rustc_const_eval/src/transform/validate.rs

-1
Original file line numberDiff line numberDiff line change
@@ -13,7 +13,6 @@ use rustc_middle::mir::{
1313
TerminatorKind, UnOp, START_BLOCK,
1414
};
1515
use rustc_middle::ty::fold::BottomUpFolder;
16-
use rustc_middle::ty::subst::Subst;
1716
use rustc_middle::ty::{self, InstanceDef, ParamEnv, Ty, TyCtxt, TypeFoldable, TypeVisitable};
1817
use rustc_mir_dataflow::impls::MaybeStorageLive;
1918
use rustc_mir_dataflow::storage::always_storage_live_locals;

‎compiler/rustc_infer/src/infer/error_reporting/mod.rs

+2-2
Original file line numberDiff line numberDiff line change
@@ -69,8 +69,8 @@ use rustc_middle::dep_graph::DepContext;
6969
use rustc_middle::ty::print::with_no_trimmed_paths;
7070
use rustc_middle::ty::relate::{self, RelateResult, TypeRelation};
7171
use rustc_middle::ty::{
72-
self, error::TypeError, Binder, List, Region, Subst, Ty, TyCtxt, TypeFoldable,
73-
TypeSuperVisitable, TypeVisitable,
72+
self, error::TypeError, Binder, List, Region, Ty, TyCtxt, TypeFoldable, TypeSuperVisitable,
73+
TypeVisitable,
7474
};
7575
use rustc_span::{sym, symbol::kw, BytePos, DesugaringKind, Pos, Span};
7676
use rustc_target::spec::abi;

‎compiler/rustc_infer/src/infer/error_reporting/need_type_info.rs

+1-1
Original file line numberDiff line numberDiff line change
@@ -15,8 +15,8 @@ use rustc_middle::hir::nested_filter;
1515
use rustc_middle::infer::unify_key::{ConstVariableOrigin, ConstVariableOriginKind};
1616
use rustc_middle::ty::adjustment::{Adjust, Adjustment, AutoBorrow, AutoBorrowMutability};
1717
use rustc_middle::ty::print::{FmtPrinter, PrettyPrinter, Print, Printer};
18-
use rustc_middle::ty::subst::{GenericArg, GenericArgKind, Subst, SubstsRef};
1918
use rustc_middle::ty::{self, DefIdTree, InferConst};
19+
use rustc_middle::ty::{GenericArg, GenericArgKind, SubstsRef};
2020
use rustc_middle::ty::{IsSuggestable, Ty, TyCtxt, TypeckResults};
2121
use rustc_session::SessionDiagnostic;
2222
use rustc_span::symbol::{kw, Ident};

‎compiler/rustc_infer/src/infer/opaque_types.rs

+1-1
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@ use rustc_data_structures::vec_map::VecMap;
88
use rustc_hir as hir;
99
use rustc_middle::traits::ObligationCause;
1010
use rustc_middle::ty::fold::BottomUpFolder;
11-
use rustc_middle::ty::subst::{GenericArgKind, Subst};
11+
use rustc_middle::ty::GenericArgKind;
1212
use rustc_middle::ty::{
1313
self, OpaqueHiddenType, OpaqueTypeKey, Ty, TyCtxt, TypeFoldable, TypeSuperVisitable,
1414
TypeVisitable, TypeVisitor,

‎compiler/rustc_infer/src/infer/outlives/verify.rs

+1-1
Original file line numberDiff line numberDiff line change
@@ -5,7 +5,7 @@ use crate::infer::{GenericKind, VerifyBound};
55
use rustc_data_structures::captures::Captures;
66
use rustc_data_structures::sso::SsoHashSet;
77
use rustc_hir::def_id::DefId;
8-
use rustc_middle::ty::subst::{GenericArg, Subst};
8+
use rustc_middle::ty::GenericArg;
99
use rustc_middle::ty::{self, EarlyBinder, OutlivesPredicate, Ty, TyCtxt};
1010

1111
use smallvec::smallvec;

‎compiler/rustc_middle/src/mir/mod.rs

+1-1
Original file line numberDiff line numberDiff line change
@@ -9,10 +9,10 @@ use crate::mir::visit::MirVisitable;
99
use crate::ty::codec::{TyDecoder, TyEncoder};
1010
use crate::ty::fold::{FallibleTypeFolder, TypeFoldable, TypeSuperFoldable};
1111
use crate::ty::print::{FmtPrinter, Printer};
12-
use crate::ty::subst::{GenericArg, InternalSubsts, Subst, SubstsRef};
1312
use crate::ty::visit::{TypeSuperVisitable, TypeVisitable, TypeVisitor};
1413
use crate::ty::{self, List, Ty, TyCtxt};
1514
use crate::ty::{AdtDef, InstanceDef, ScalarInt, UserTypeAnnotationIndex};
15+
use crate::ty::{GenericArg, InternalSubsts, SubstsRef};
1616

1717
use rustc_data_structures::captures::Captures;
1818
use rustc_errors::ErrorGuaranteed;

‎compiler/rustc_middle/src/mir/tcx.rs

-1
Original file line numberDiff line numberDiff line change
@@ -4,7 +4,6 @@
44
*/
55

66
use crate::mir::*;
7-
use crate::ty::subst::Subst;
87
use crate::ty::{self, Ty, TyCtxt};
98
use rustc_hir as hir;
109
use rustc_target::abi::VariantIdx;

‎compiler/rustc_middle/src/ty/abstract_const.rs

+1-1
Original file line numberDiff line numberDiff line change
@@ -1,7 +1,7 @@
11
//! A subset of a mir body used for const evaluatability checking.
22
use crate::mir;
33
use crate::ty::visit::TypeVisitable;
4-
use crate::ty::{self, subst::Subst, DelaySpanBugEmitted, EarlyBinder, SubstsRef, Ty, TyCtxt};
4+
use crate::ty::{self, DelaySpanBugEmitted, EarlyBinder, SubstsRef, Ty, TyCtxt};
55
use rustc_errors::ErrorGuaranteed;
66
use rustc_hir::def_id::DefId;
77
use std::cmp;

‎compiler/rustc_middle/src/ty/context.rs

+1-1
Original file line numberDiff line numberDiff line change
@@ -15,7 +15,6 @@ use crate::mir::{
1515
use crate::thir::Thir;
1616
use crate::traits;
1717
use crate::ty::query::{self, TyCtxtAt};
18-
use crate::ty::subst::{GenericArg, GenericArgKind, InternalSubsts, Subst, SubstsRef, UserSubsts};
1918
use crate::ty::{
2019
self, AdtDef, AdtDefData, AdtKind, Binder, BindingMode, BoundVar, CanonicalPolyFnSig,
2120
ClosureSizeProfileData, Const, ConstS, ConstVid, DefIdTree, ExistentialPredicate, FloatTy,
@@ -24,6 +23,7 @@ use crate::ty::{
2423
RegionKind, ReprOptions, TraitObjectVisitor, Ty, TyKind, TyS, TyVar, TyVid, TypeAndMut, UintTy,
2524
Visibility,
2625
};
26+
use crate::ty::{GenericArg, GenericArgKind, InternalSubsts, SubstsRef, UserSubsts};
2727
use rustc_ast as ast;
2828
use rustc_data_structures::fingerprint::Fingerprint;
2929
use rustc_data_structures::fx::{FxHashMap, FxHashSet};

‎compiler/rustc_middle/src/ty/generics.rs

+1-2
Original file line numberDiff line numberDiff line change
@@ -1,6 +1,5 @@
11
use crate::ty;
2-
use crate::ty::subst::{Subst, SubstsRef};
3-
use crate::ty::EarlyBinder;
2+
use crate::ty::{EarlyBinder, SubstsRef};
43
use rustc_ast as ast;
54
use rustc_data_structures::fx::FxHashMap;
65
use rustc_hir::def_id::DefId;

‎compiler/rustc_middle/src/ty/instance.rs

+2-4
Original file line numberDiff line numberDiff line change
@@ -1,9 +1,7 @@
11
use crate::middle::codegen_fn_attrs::CodegenFnAttrFlags;
22
use crate::ty::print::{FmtPrinter, Printer};
3-
use crate::ty::subst::{InternalSubsts, Subst};
4-
use crate::ty::{
5-
self, EarlyBinder, SubstsRef, Ty, TyCtxt, TypeFoldable, TypeSuperFoldable, TypeVisitable,
6-
};
3+
use crate::ty::{self, Ty, TyCtxt, TypeFoldable, TypeSuperFoldable, TypeVisitable};
4+
use crate::ty::{EarlyBinder, InternalSubsts, SubstsRef};
75
use rustc_errors::ErrorGuaranteed;
86
use rustc_hir::def::Namespace;
97
use rustc_hir::def_id::{CrateNum, DefId};

‎compiler/rustc_middle/src/ty/layout.rs

-1
Original file line numberDiff line numberDiff line change
@@ -1,7 +1,6 @@
11
use crate::middle::codegen_fn_attrs::CodegenFnAttrFlags;
22
use crate::mir::{GeneratorLayout, GeneratorSavedLocal};
33
use crate::ty::normalize_erasing_regions::NormalizationError;
4-
use crate::ty::subst::Subst;
54
use crate::ty::{
65
self, layout_sanity_check::sanity_check_layout, subst::SubstsRef, EarlyBinder, ReprOptions, Ty,
76
TyCtxt, TypeVisitable,

‎compiler/rustc_middle/src/ty/mod.rs

+3-3
Original file line numberDiff line numberDiff line change
@@ -89,9 +89,9 @@ pub use self::sty::BoundRegionKind::*;
8989
pub use self::sty::{
9090
Article, Binder, BoundRegion, BoundRegionKind, BoundTy, BoundTyKind, BoundVar,
9191
BoundVariableKind, CanonicalPolyFnSig, ClosureSubsts, ClosureSubstsParts, ConstVid,
92-
EarlyBinder, EarlyBoundRegion, ExistentialPredicate, ExistentialProjection,
93-
ExistentialTraitRef, FnSig, FreeRegion, GenSig, GeneratorSubsts, GeneratorSubstsParts,
94-
InlineConstSubsts, InlineConstSubstsParts, ParamConst, ParamTy, PolyExistentialProjection,
92+
EarlyBoundRegion, ExistentialPredicate, ExistentialProjection, ExistentialTraitRef, FnSig,
93+
FreeRegion, GenSig, GeneratorSubsts, GeneratorSubstsParts, InlineConstSubsts,
94+
InlineConstSubstsParts, ParamConst, ParamTy, PolyExistentialProjection,
9595
PolyExistentialTraitRef, PolyFnSig, PolyGenSig, PolyTraitRef, ProjectionTy, Region, RegionKind,
9696
RegionVid, TraitRef, TyKind, TypeAndMut, UpvarSubsts, VarianceDiagInfo,
9797
};

‎compiler/rustc_middle/src/ty/normalize_erasing_regions.rs

+1-2
Original file line numberDiff line numberDiff line change
@@ -10,8 +10,7 @@
1010
use crate::mir;
1111
use crate::traits::query::NoSolution;
1212
use crate::ty::fold::{FallibleTypeFolder, TypeFoldable, TypeFolder};
13-
use crate::ty::subst::{Subst, SubstsRef};
14-
use crate::ty::{self, EarlyBinder, Ty, TyCtxt};
13+
use crate::ty::{self, EarlyBinder, SubstsRef, Ty, TyCtxt};
1514

1615
#[derive(Debug, Copy, Clone, HashStable, TyEncodable, TyDecodable)]
1716
pub enum NormalizationError<'tcx> {

‎compiler/rustc_middle/src/ty/print/mod.rs

+1-1
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,4 @@
1-
use crate::ty::subst::{GenericArg, Subst};
1+
use crate::ty::GenericArg;
22
use crate::ty::{self, DefIdTree, Ty, TyCtxt};
33

44
use rustc_data_structures::fx::FxHashSet;

‎compiler/rustc_middle/src/ty/print/pretty.rs

+1-1
Original file line numberDiff line numberDiff line change
@@ -1,9 +1,9 @@
11
use crate::mir::interpret::{AllocRange, GlobalAlloc, Pointer, Provenance, Scalar};
2-
use crate::ty::subst::{GenericArg, GenericArgKind, Subst};
32
use crate::ty::{
43
self, ConstInt, DefIdTree, ParamConst, ScalarInt, Term, TermKind, Ty, TyCtxt, TypeFoldable,
54
TypeSuperFoldable, TypeSuperVisitable, TypeVisitable,
65
};
6+
use crate::ty::{GenericArg, GenericArgKind};
77
use rustc_apfloat::ieee::{Double, Single};
88
use rustc_data_structures::fx::{FxHashMap, FxIndexMap};
99
use rustc_data_structures::sso::SsoHashSet;

‎compiler/rustc_middle/src/ty/relate.rs

+1-1
Original file line numberDiff line numberDiff line change
@@ -5,8 +5,8 @@
55
//! subtyping, type equality, etc.
66
77
use crate::ty::error::{ExpectedFound, TypeError};
8-
use crate::ty::subst::{GenericArg, GenericArgKind, Subst, SubstsRef};
98
use crate::ty::{self, ImplSubject, Term, TermKind, Ty, TyCtxt, TypeFoldable};
9+
use crate::ty::{GenericArg, GenericArgKind, SubstsRef};
1010
use rustc_hir as ast;
1111
use rustc_hir::def_id::DefId;
1212
use rustc_span::DUMMY_SP;

‎compiler/rustc_middle/src/ty/sty.rs

+2-73
Original file line numberDiff line numberDiff line change
@@ -3,7 +3,7 @@
33
#![allow(rustc::usage_of_ty_tykind)]
44

55
use crate::infer::canonical::Canonical;
6-
use crate::ty::subst::{GenericArg, InternalSubsts, Subst, SubstsRef};
6+
use crate::ty::subst::{GenericArg, InternalSubsts, SubstsRef};
77
use crate::ty::visit::ValidateBoundVars;
88
use crate::ty::InferTy::*;
99
use crate::ty::{
@@ -551,7 +551,7 @@ impl<'tcx> GeneratorSubsts<'tcx> {
551551
layout.variant_fields.iter().map(move |variant| {
552552
variant
553553
.iter()
554-
.map(move |field| EarlyBinder(layout.field_tys[*field]).subst(tcx, self.substs))
554+
.map(move |field| ty::EarlyBinder(layout.field_tys[*field]).subst(tcx, self.substs))
555555
})
556556
}
557557

@@ -915,77 +915,6 @@ impl<'tcx> PolyExistentialTraitRef<'tcx> {
915915
}
916916
}
917917

918-
#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
919-
#[derive(Encodable, Decodable, HashStable)]
920-
pub struct EarlyBinder<T>(pub T);
921-
922-
/// For early binders, you should first call `subst` before using any visitors.
923-
impl<'tcx, T> !TypeFoldable<'tcx> for ty::EarlyBinder<T> {}
924-
impl<'tcx, T> !TypeVisitable<'tcx> for ty::EarlyBinder<T> {}
925-
926-
impl<T> EarlyBinder<T> {
927-
pub fn as_ref(&self) -> EarlyBinder<&T> {
928-
EarlyBinder(&self.0)
929-
}
930-
931-
pub fn map_bound_ref<F, U>(&self, f: F) -> EarlyBinder<U>
932-
where
933-
F: FnOnce(&T) -> U,
934-
{
935-
self.as_ref().map_bound(f)
936-
}
937-
938-
pub fn map_bound<F, U>(self, f: F) -> EarlyBinder<U>
939-
where
940-
F: FnOnce(T) -> U,
941-
{
942-
let value = f(self.0);
943-
EarlyBinder(value)
944-
}
945-
946-
pub fn try_map_bound<F, U, E>(self, f: F) -> Result<EarlyBinder<U>, E>
947-
where
948-
F: FnOnce(T) -> Result<U, E>,
949-
{
950-
let value = f(self.0)?;
951-
Ok(EarlyBinder(value))
952-
}
953-
954-
pub fn rebind<U>(&self, value: U) -> EarlyBinder<U> {
955-
EarlyBinder(value)
956-
}
957-
}
958-
959-
impl<T> EarlyBinder<Option<T>> {
960-
pub fn transpose(self) -> Option<EarlyBinder<T>> {
961-
self.0.map(|v| EarlyBinder(v))
962-
}
963-
}
964-
965-
impl<T, U> EarlyBinder<(T, U)> {
966-
pub fn transpose_tuple2(self) -> (EarlyBinder<T>, EarlyBinder<U>) {
967-
(EarlyBinder(self.0.0), EarlyBinder(self.0.1))
968-
}
969-
}
970-
971-
pub struct EarlyBinderIter<T> {
972-
t: T,
973-
}
974-
975-
impl<T: IntoIterator> EarlyBinder<T> {
976-
pub fn transpose_iter(self) -> EarlyBinderIter<T::IntoIter> {
977-
EarlyBinderIter { t: self.0.into_iter() }
978-
}
979-
}
980-
981-
impl<T: Iterator> Iterator for EarlyBinderIter<T> {
982-
type Item = EarlyBinder<T::Item>;
983-
984-
fn next(&mut self) -> Option<Self::Item> {
985-
self.t.next().map(|i| EarlyBinder(i))
986-
}
987-
}
988-
989918
#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug, TyEncodable, TyDecodable)]
990919
#[derive(HashStable)]
991920
pub enum BoundVariableKind {

‎compiler/rustc_middle/src/ty/subst.rs

+69-8
Original file line numberDiff line numberDiff line change
@@ -497,18 +497,79 @@ impl<'tcx, T: TypeVisitable<'tcx>> TypeVisitable<'tcx> for &'tcx ty::List<T> {
497497
}
498498
}
499499

500-
// Just call `foo.subst(tcx, substs)` to perform a substitution across `foo`.
501-
#[rustc_on_unimplemented(message = "Calling `subst` must now be done through an `EarlyBinder`")]
502-
pub trait Subst<'tcx>: Sized {
503-
type Inner;
500+
#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
501+
#[derive(Encodable, Decodable, HashStable)]
502+
pub struct EarlyBinder<T>(pub T);
504503

505-
fn subst(self, tcx: TyCtxt<'tcx>, substs: &[GenericArg<'tcx>]) -> Self::Inner;
504+
/// For early binders, you should first call `subst` before using any visitors.
505+
impl<'tcx, T> !TypeFoldable<'tcx> for ty::EarlyBinder<T> {}
506+
impl<'tcx, T> !TypeVisitable<'tcx> for ty::EarlyBinder<T> {}
507+
508+
impl<T> EarlyBinder<T> {
509+
pub fn as_ref(&self) -> EarlyBinder<&T> {
510+
EarlyBinder(&self.0)
511+
}
512+
513+
pub fn map_bound_ref<F, U>(&self, f: F) -> EarlyBinder<U>
514+
where
515+
F: FnOnce(&T) -> U,
516+
{
517+
self.as_ref().map_bound(f)
518+
}
519+
520+
pub fn map_bound<F, U>(self, f: F) -> EarlyBinder<U>
521+
where
522+
F: FnOnce(T) -> U,
523+
{
524+
let value = f(self.0);
525+
EarlyBinder(value)
526+
}
527+
528+
pub fn try_map_bound<F, U, E>(self, f: F) -> Result<EarlyBinder<U>, E>
529+
where
530+
F: FnOnce(T) -> Result<U, E>,
531+
{
532+
let value = f(self.0)?;
533+
Ok(EarlyBinder(value))
534+
}
535+
536+
pub fn rebind<U>(&self, value: U) -> EarlyBinder<U> {
537+
EarlyBinder(value)
538+
}
539+
}
540+
541+
impl<T> EarlyBinder<Option<T>> {
542+
pub fn transpose(self) -> Option<EarlyBinder<T>> {
543+
self.0.map(|v| EarlyBinder(v))
544+
}
506545
}
507546

508-
impl<'tcx, T: TypeFoldable<'tcx>> Subst<'tcx> for ty::EarlyBinder<T> {
509-
type Inner = T;
547+
impl<T, U> EarlyBinder<(T, U)> {
548+
pub fn transpose_tuple2(self) -> (EarlyBinder<T>, EarlyBinder<U>) {
549+
(EarlyBinder(self.0.0), EarlyBinder(self.0.1))
550+
}
551+
}
552+
553+
pub struct EarlyBinderIter<T> {
554+
t: T,
555+
}
556+
557+
impl<T: IntoIterator> EarlyBinder<T> {
558+
pub fn transpose_iter(self) -> EarlyBinderIter<T::IntoIter> {
559+
EarlyBinderIter { t: self.0.into_iter() }
560+
}
561+
}
562+
563+
impl<T: Iterator> Iterator for EarlyBinderIter<T> {
564+
type Item = EarlyBinder<T::Item>;
565+
566+
fn next(&mut self) -> Option<Self::Item> {
567+
self.t.next().map(|i| EarlyBinder(i))
568+
}
569+
}
510570

511-
fn subst(self, tcx: TyCtxt<'tcx>, substs: &[GenericArg<'tcx>]) -> Self::Inner {
571+
impl<'tcx, T: TypeFoldable<'tcx>> ty::EarlyBinder<T> {
572+
pub fn subst(self, tcx: TyCtxt<'tcx>, substs: &[GenericArg<'tcx>]) -> T {
512573
let mut folder = SubstFolder { tcx, substs, binders_passed: 0 };
513574
self.0.fold_with(&mut folder)
514575
}

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