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Move folding & visiting traits into type library #107712

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bea94aa
Refactor functions used by HasEscapingVarsVisitor
eggyal Feb 5, 2023
e0767d9
Refactor functions used by HasTypeFlagsVisitor
eggyal Feb 5, 2023
2eb4609
Refactor default TypeVisitable::error_reported
eggyal Feb 5, 2023
f92b450
Project Binder and Predicate from Interner trait
eggyal Feb 5, 2023
8fcd967
Make visiting generic over the interner
eggyal Feb 5, 2023
8754bd3
Make folding generic over the interner
eggyal Feb 5, 2023
59ee434
Move visiting traits to type library
eggyal Feb 6, 2023
ff87b7a
Move folding traits to type library
eggyal Feb 6, 2023
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1 change: 1 addition & 0 deletions Cargo.lock
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Expand Up @@ -4868,6 +4868,7 @@ dependencies = [
"rustc_macros",
"rustc_serialize",
"smallvec",
"tracing",
]

[[package]]
Expand Down
4 changes: 2 additions & 2 deletions compiler/rustc_borrowck/src/constraint_generation.rs
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Expand Up @@ -9,7 +9,7 @@ use rustc_middle::mir::{
};
use rustc_middle::ty::subst::SubstsRef;
use rustc_middle::ty::visit::TypeVisitable;
use rustc_middle::ty::{self, RegionVid, Ty};
use rustc_middle::ty::{self, RegionVid, Ty, TyCtxt};

use crate::{
borrow_set::BorrowSet, facts::AllFacts, location::LocationTable, nll::ToRegionVid,
Expand Down Expand Up @@ -165,7 +165,7 @@ impl<'cx, 'tcx> ConstraintGeneration<'cx, 'tcx> {
/// `location`.
fn add_regular_live_constraint<T>(&mut self, live_ty: T, location: Location)
where
T: TypeVisitable<'tcx>,
T: TypeVisitable<TyCtxt<'tcx>>,
{
debug!("add_regular_live_constraint(live_ty={:?}, location={:?})", live_ty, location);

Expand Down
4 changes: 2 additions & 2 deletions compiler/rustc_borrowck/src/diagnostics/bound_region_errors.rs
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Expand Up @@ -106,7 +106,7 @@ impl<'tcx> ToUniverseInfo<'tcx>
}
}

impl<'tcx, T: Copy + fmt::Display + TypeFoldable<'tcx> + 'tcx> ToUniverseInfo<'tcx>
impl<'tcx, T: Copy + fmt::Display + TypeFoldable<TyCtxt<'tcx>> + 'tcx> ToUniverseInfo<'tcx>
for Canonical<'tcx, ty::ParamEnvAnd<'tcx, type_op::Normalize<T>>>
{
fn to_universe_info(self, base_universe: ty::UniverseIndex) -> UniverseInfo<'tcx> {
Expand Down Expand Up @@ -258,7 +258,7 @@ struct NormalizeQuery<'tcx, T> {

impl<'tcx, T> TypeOpInfo<'tcx> for NormalizeQuery<'tcx, T>
where
T: Copy + fmt::Display + TypeFoldable<'tcx> + 'tcx,
T: Copy + fmt::Display + TypeFoldable<TyCtxt<'tcx>> + 'tcx,
{
fn fallback_error(
&self,
Expand Down
2 changes: 1 addition & 1 deletion compiler/rustc_borrowck/src/region_infer/mod.rs
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Expand Up @@ -1278,7 +1278,7 @@ impl<'tcx> RegionInferenceContext<'tcx> {
/// we use this kind of hacky solution.
fn normalize_to_scc_representatives<T>(&self, tcx: TyCtxt<'tcx>, value: T) -> T
where
T: TypeFoldable<'tcx>,
T: TypeFoldable<TyCtxt<'tcx>>,
{
tcx.fold_regions(value, |r, _db| {
let vid = self.to_region_vid(r);
Expand Down
2 changes: 1 addition & 1 deletion compiler/rustc_borrowck/src/region_infer/opaque_types.rs
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Expand Up @@ -179,7 +179,7 @@ impl<'tcx> RegionInferenceContext<'tcx> {
/// region names in error messages.
pub(crate) fn name_regions<T>(&self, tcx: TyCtxt<'tcx>, ty: T) -> T
where
T: TypeFoldable<'tcx>,
T: TypeFoldable<TyCtxt<'tcx>>,
{
tcx.fold_regions(ty, |region, _| match *region {
ty::ReVar(vid) => {
Expand Down
4 changes: 2 additions & 2 deletions compiler/rustc_borrowck/src/renumber.rs
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Expand Up @@ -32,7 +32,7 @@ pub fn renumber_mir<'tcx>(
#[instrument(skip(infcx), level = "debug")]
pub fn renumber_regions<'tcx, T>(infcx: &InferCtxt<'tcx>, value: T) -> T
where
T: TypeFoldable<'tcx>,
T: TypeFoldable<TyCtxt<'tcx>>,
{
infcx.tcx.fold_regions(value, |_region, _depth| {
let origin = NllRegionVariableOrigin::Existential { from_forall: false };
Expand All @@ -47,7 +47,7 @@ struct NllVisitor<'a, 'tcx> {
impl<'a, 'tcx> NllVisitor<'a, 'tcx> {
fn renumber_regions<T>(&mut self, value: T) -> T
where
T: TypeFoldable<'tcx>,
T: TypeFoldable<TyCtxt<'tcx>>,
{
renumber_regions(self.infcx, value)
}
Expand Down
4 changes: 2 additions & 2 deletions compiler/rustc_borrowck/src/type_check/canonical.rs
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Expand Up @@ -2,7 +2,7 @@ use std::fmt;

use rustc_infer::infer::{canonical::Canonical, InferOk};
use rustc_middle::mir::ConstraintCategory;
use rustc_middle::ty::{self, ToPredicate, Ty, TypeFoldable};
use rustc_middle::ty::{self, ToPredicate, Ty, TyCtxt, TypeFoldable};
use rustc_span::def_id::DefId;
use rustc_span::Span;
use rustc_trait_selection::traits::query::type_op::{self, TypeOpOutput};
Expand Down Expand Up @@ -66,7 +66,7 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
canonical: &Canonical<'tcx, T>,
) -> T
where
T: TypeFoldable<'tcx>,
T: TypeFoldable<TyCtxt<'tcx>>,
{
let old_universe = self.infcx.universe();

Expand Down
2 changes: 1 addition & 1 deletion compiler/rustc_borrowck/src/type_check/constraint_conversion.rs
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Expand Up @@ -179,7 +179,7 @@ impl<'a, 'tcx> ConstraintConversion<'a, 'tcx> {
///
/// FIXME: This should get removed once higher ranked region obligations
/// are dealt with during trait solving.
fn replace_placeholders_with_nll<T: TypeFoldable<'tcx>>(&mut self, value: T) -> T {
fn replace_placeholders_with_nll<T: TypeFoldable<TyCtxt<'tcx>>>(&mut self, value: T) -> T {
if value.has_placeholders() {
self.tcx.fold_regions(value, |r, _| match *r {
ty::RePlaceholder(placeholder) => {
Expand Down
6 changes: 3 additions & 3 deletions compiler/rustc_borrowck/src/type_check/liveness/trace.rs
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Expand Up @@ -3,7 +3,7 @@ use rustc_index::bit_set::HybridBitSet;
use rustc_index::interval::IntervalSet;
use rustc_infer::infer::canonical::QueryRegionConstraints;
use rustc_middle::mir::{BasicBlock, Body, ConstraintCategory, Local, Location};
use rustc_middle::ty::{Ty, TypeVisitable};
use rustc_middle::ty::{Ty, TyCtxt, TypeVisitable};
use rustc_trait_selection::traits::query::dropck_outlives::DropckOutlivesResult;
use rustc_trait_selection::traits::query::type_op::outlives::DropckOutlives;
use rustc_trait_selection::traits::query::type_op::{TypeOp, TypeOpOutput};
Expand Down Expand Up @@ -477,7 +477,7 @@ impl<'tcx> LivenessContext<'_, '_, '_, 'tcx> {
/// points `live_at`.
fn add_use_live_facts_for(
&mut self,
value: impl TypeVisitable<'tcx>,
value: impl TypeVisitable<TyCtxt<'tcx>>,
live_at: &IntervalSet<PointIndex>,
) {
debug!("add_use_live_facts_for(value={:?})", value);
Expand Down Expand Up @@ -542,7 +542,7 @@ impl<'tcx> LivenessContext<'_, '_, '_, 'tcx> {
fn make_all_regions_live(
elements: &RegionValueElements,
typeck: &mut TypeChecker<'_, 'tcx>,
value: impl TypeVisitable<'tcx>,
value: impl TypeVisitable<TyCtxt<'tcx>>,
live_at: &IntervalSet<PointIndex>,
) {
debug!("make_all_regions_live(value={:?})", value);
Expand Down
10 changes: 5 additions & 5 deletions compiler/rustc_borrowck/src/universal_regions.rs
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Expand Up @@ -695,7 +695,7 @@ trait InferCtxtExt<'tcx> {
value: T,
) -> T
where
T: TypeFoldable<'tcx>;
T: TypeFoldable<TyCtxt<'tcx>>;

fn replace_bound_regions_with_nll_infer_vars<T>(
&self,
Expand All @@ -705,7 +705,7 @@ trait InferCtxtExt<'tcx> {
indices: &mut UniversalRegionIndices<'tcx>,
) -> T
where
T: TypeFoldable<'tcx>;
T: TypeFoldable<TyCtxt<'tcx>>;

fn replace_late_bound_regions_with_nll_infer_vars_in_recursive_scope(
&self,
Expand All @@ -727,7 +727,7 @@ impl<'tcx> InferCtxtExt<'tcx> for InferCtxt<'tcx> {
value: T,
) -> T
where
T: TypeFoldable<'tcx>,
T: TypeFoldable<TyCtxt<'tcx>>,
{
self.tcx.fold_regions(value, |_region, _depth| self.next_nll_region_var(origin))
}
Expand All @@ -741,7 +741,7 @@ impl<'tcx> InferCtxtExt<'tcx> for InferCtxt<'tcx> {
indices: &mut UniversalRegionIndices<'tcx>,
) -> T
where
T: TypeFoldable<'tcx>,
T: TypeFoldable<TyCtxt<'tcx>>,
{
let (value, _map) = self.tcx.replace_late_bound_regions(value, |br| {
debug!(?br);
Expand Down Expand Up @@ -833,7 +833,7 @@ impl<'tcx> UniversalRegionIndices<'tcx> {
/// returned by `to_region_vid`.
pub fn fold_to_region_vids<T>(&self, tcx: TyCtxt<'tcx>, value: T) -> T
where
T: TypeFoldable<'tcx>,
T: TypeFoldable<TyCtxt<'tcx>>,
{
tcx.fold_regions(value, |region, _| tcx.mk_region(ty::ReVar(self.to_region_vid(region))))
}
Expand Down
2 changes: 1 addition & 1 deletion compiler/rustc_codegen_cranelift/src/common.rs
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Expand Up @@ -336,7 +336,7 @@ impl<'tcx> HasTargetSpec for FunctionCx<'_, '_, 'tcx> {
impl<'tcx> FunctionCx<'_, '_, 'tcx> {
pub(crate) fn monomorphize<T>(&self, value: T) -> T
where
T: TypeFoldable<'tcx> + Copy,
T: TypeFoldable<TyCtxt<'tcx>> + Copy,
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Could there be a trait alias for TypeFoldable filling in TyCtxt in rustc_middle? That would significantly reduce the diff.

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Wasn't aware of trait aliases! Good idea, will look into it.

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Okay so, whilst a trait alias can be used in bounds such as these, it can't be used to implement the trait: so we'll still need impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for ... followed by ... where T: TypeFoldableAlias<'tcx>—and hence we'd still end up modifying each of these bounds to refer to the alias instead, unless the alias is named TypeFoldable (which I think would be very confusing unless the trait itself is renamed something else?). So the diff will likely remain similar, but the boilerplate would be slightly reduced.

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I think it's fine to have a generic TypeFoldable that is almost never used and one that is used everywhere else. We do a similar thing for Ty after all. It's just that type aliases are stable.

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@eggyal eggyal Feb 7, 2023 •
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I created another branch with an alternative implementation using trait aliases, but as suspected the impact on the overall diff is not so significant: +1494-1309 across 99 files versus this PR's +1709-1434 across 112 files.

I'm happy to use/force-push that if it's preferred, but IMHO defining e.g. TypeFoldable to mean different things depending on whether the alias or the underlying trait are brought into scope is pretty confusing (and all the existing reexports certainly don't help to keep track of what each name means in a given context). In particular for each trait, that branch now has at very least the following:

rustc_type_ir::fold::TypeFoldable // (1): actual trait definition

rustc_middle::ty::fold::TypeFoldable // (2): re-export of (1)
rustc_middle::ty::ir::TypeFoldable // (3): re-export of (2)

rustc_middle::ty::fold::ctxt::TypeFoldable // (4): type alias definition
rustc_middle::ty::TypeFoldable // (5): re-export of (4)

And the codebase variously uses each of the above in different and inconsistent ways. Certainly this could (and probably should) be rationalised, but fundamentally I think the naming conflict is unhelpful.

Incidentally, you may note that branch also removes some previously required imports from scope: this is a direct result of using trait aliases, which erroneously bring supertraits into scope (reported #107747). Once that bug is resolved, many of those imports will need to be re-added.

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Thanks! ❤️

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@eggyal eggyal Feb 8, 2023 •
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On reflection, I'm not sure there's any benefit in blanket implementing each (existing) middle trait (parameterised by 'tcx) for all types implementing the respective ir trait (parameterised by TyCtxt<'tcx>), because generic methods in the middle traits (e.g. TypeVisitable::visit_with) are parameterised by a type that must implement some other middle trait (e.g. V: TypeVisitor<'tcx>) and, in delegating to the ir trait, the blanket implementation must pass a value of that generic type to its equivalent method (ir::TypeVisitable::visit_with), which requires that value also to implement the respective ir trait (ir::TypeVisitor<TyCtxt<'tcx>>). However this cannot be guaranteed unless the middle traits are subtraits of the ir traits, thus always requiring that the ir traits be implemented and negating much benefit of retaining the middle traits; any remaining ergonomic benefit is then negated by ambiguities that such supertraits introduce when resolving associated items.

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Hmm... I see. I'm assuming trait aliases won't allow impls TraitAlias for Type, thus leading to the branch you linked that still references TypeVisitable<TyCtxt<'tcx>> almost as often as before.

I'm convinced to reopen this PR, even if it's a bit annoying to have to do that all over the place.

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@oli-obk oli-obk Feb 8, 2023 •
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Thanks for doing the experiment. Please add this information to the PR so that it's clear why this design was chosen

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Indeed, you cannot (currently?) impl TraitAlias for ....

Will open a new PR (am looking into some other changes anyway) and provide the detail as suggested. Thanks!

{
self.instance.subst_mir_and_normalize_erasing_regions(
self.tcx,
Expand Down
4 changes: 2 additions & 2 deletions compiler/rustc_codegen_ssa/src/mir/mod.rs
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Expand Up @@ -3,7 +3,7 @@ use crate::traits::*;
use rustc_middle::mir;
use rustc_middle::mir::interpret::ErrorHandled;
use rustc_middle::ty::layout::{FnAbiOf, HasTyCtxt, TyAndLayout};
use rustc_middle::ty::{self, Instance, Ty, TypeFoldable, TypeVisitable};
use rustc_middle::ty::{self, Instance, Ty, TyCtxt, TypeFoldable, TypeVisitable};
use rustc_target::abi::call::{FnAbi, PassMode};

use std::iter;
Expand Down Expand Up @@ -105,7 +105,7 @@ pub struct FunctionCx<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> {
impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
pub fn monomorphize<T>(&self, value: T) -> T
where
T: Copy + TypeFoldable<'tcx>,
T: Copy + TypeFoldable<TyCtxt<'tcx>>,
{
debug!("monomorphize: self.instance={:?}", self.instance);
self.instance.subst_mir_and_normalize_erasing_regions(
Expand Down
6 changes: 4 additions & 2 deletions compiler/rustc_const_eval/src/interpret/eval_context.rs
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Expand Up @@ -489,7 +489,9 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {

/// Call this on things you got out of the MIR (so it is as generic as the current
/// stack frame), to bring it into the proper environment for this interpreter.
pub(super) fn subst_from_current_frame_and_normalize_erasing_regions<T: TypeFoldable<'tcx>>(
pub(super) fn subst_from_current_frame_and_normalize_erasing_regions<
T: TypeFoldable<TyCtxt<'tcx>>,
>(
&self,
value: T,
) -> Result<T, InterpError<'tcx>> {
Expand All @@ -498,7 +500,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {

/// Call this on things you got out of the MIR (so it is as generic as the provided
/// stack frame), to bring it into the proper environment for this interpreter.
pub(super) fn subst_from_frame_and_normalize_erasing_regions<T: TypeFoldable<'tcx>>(
pub(super) fn subst_from_frame_and_normalize_erasing_regions<T: TypeFoldable<TyCtxt<'tcx>>>(
&self,
frame: &Frame<'mir, 'tcx, M::Provenance, M::FrameExtra>,
value: T,
Expand Down
4 changes: 2 additions & 2 deletions compiler/rustc_const_eval/src/interpret/util.rs
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Expand Up @@ -9,7 +9,7 @@ use std::ops::ControlFlow;
/// case these parameters are unused.
pub(crate) fn ensure_monomorphic_enough<'tcx, T>(tcx: TyCtxt<'tcx>, ty: T) -> InterpResult<'tcx>
where
T: TypeVisitable<'tcx>,
T: TypeVisitable<TyCtxt<'tcx>>,
{
debug!("ensure_monomorphic_enough: ty={:?}", ty);
if !ty.needs_subst() {
Expand All @@ -21,7 +21,7 @@ where
tcx: TyCtxt<'tcx>,
}

impl<'tcx> TypeVisitor<'tcx> for UsedParamsNeedSubstVisitor<'tcx> {
impl<'tcx> TypeVisitor<TyCtxt<'tcx>> for UsedParamsNeedSubstVisitor<'tcx> {
type BreakTy = FoundParam;

fn visit_ty(&mut self, ty: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
Expand Down
4 changes: 2 additions & 2 deletions compiler/rustc_hir_analysis/src/check/check.rs
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Expand Up @@ -261,7 +261,7 @@ pub(super) fn check_opaque_for_inheriting_lifetimes(
selftys: Vec<(Span, Option<String>)>,
}

impl<'tcx> ty::visit::TypeVisitor<'tcx> for ProhibitOpaqueVisitor<'tcx> {
impl<'tcx> ty::visit::TypeVisitor<TyCtxt<'tcx>> for ProhibitOpaqueVisitor<'tcx> {
type BreakTy = Ty<'tcx>;

fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
Expand Down Expand Up @@ -1447,7 +1447,7 @@ fn opaque_type_cycle_error(
opaques: Vec<DefId>,
closures: Vec<DefId>,
}
impl<'tcx> ty::visit::TypeVisitor<'tcx> for OpaqueTypeCollector {
impl<'tcx> ty::visit::TypeVisitor<TyCtxt<'tcx>> for OpaqueTypeCollector {
fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
match *t.kind() {
ty::Alias(ty::Opaque, ty::AliasTy { def_id: def, .. }) => {
Expand Down
4 changes: 2 additions & 2 deletions compiler/rustc_hir_analysis/src/check/compare_impl_item.rs
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Expand Up @@ -464,7 +464,7 @@ struct RemapLateBound<'a, 'tcx> {
mapping: &'a FxHashMap<ty::BoundRegionKind, ty::BoundRegionKind>,
}

impl<'tcx> TypeFolder<'tcx> for RemapLateBound<'_, 'tcx> {
impl<'tcx> TypeFolder<TyCtxt<'tcx>> for RemapLateBound<'_, 'tcx> {
fn tcx(&self) -> TyCtxt<'tcx> {
self.tcx
}
Expand Down Expand Up @@ -835,7 +835,7 @@ impl<'a, 'tcx> ImplTraitInTraitCollector<'a, 'tcx> {
}
}

impl<'tcx> TypeFolder<'tcx> for ImplTraitInTraitCollector<'_, 'tcx> {
impl<'tcx> TypeFolder<TyCtxt<'tcx>> for ImplTraitInTraitCollector<'_, 'tcx> {
fn tcx<'a>(&'a self) -> TyCtxt<'tcx> {
self.ocx.infcx.tcx
}
Expand Down
10 changes: 5 additions & 5 deletions compiler/rustc_hir_analysis/src/check/wfcheck.rs
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Expand Up @@ -56,7 +56,7 @@ impl<'tcx> WfCheckingCtxt<'_, 'tcx> {
// `ObligationCtxt::normalize`, but provides a nice `ObligationCauseCode`.
fn normalize<T>(&self, span: Span, loc: Option<WellFormedLoc>, value: T) -> T
where
T: TypeFoldable<'tcx>,
T: TypeFoldable<TyCtxt<'tcx>>,
{
self.ocx.normalize(
&ObligationCause::new(span, self.body_def_id, ObligationCauseCode::WellFormed(loc)),
Expand Down Expand Up @@ -560,7 +560,7 @@ fn augment_param_env<'tcx>(
/// fn into_iter<'a>(&'a self) -> Self::Iter<'a>;
/// }
/// ```
fn gather_gat_bounds<'tcx, T: TypeFoldable<'tcx>>(
fn gather_gat_bounds<'tcx, T: TypeFoldable<TyCtxt<'tcx>>>(
tcx: TyCtxt<'tcx>,
param_env: ty::ParamEnv<'tcx>,
item_def_id: hir::OwnerId,
Expand Down Expand Up @@ -762,7 +762,7 @@ struct GATSubstCollector<'tcx> {
}

impl<'tcx> GATSubstCollector<'tcx> {
fn visit<T: TypeFoldable<'tcx>>(
fn visit<T: TypeFoldable<TyCtxt<'tcx>>>(
gat: DefId,
t: T,
) -> (FxHashSet<(ty::Region<'tcx>, usize)>, FxHashSet<(Ty<'tcx>, usize)>) {
Expand All @@ -773,7 +773,7 @@ impl<'tcx> GATSubstCollector<'tcx> {
}
}

impl<'tcx> TypeVisitor<'tcx> for GATSubstCollector<'tcx> {
impl<'tcx> TypeVisitor<TyCtxt<'tcx>> for GATSubstCollector<'tcx> {
type BreakTy = !;

fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
Expand Down Expand Up @@ -1436,7 +1436,7 @@ fn check_where_clauses<'tcx>(wfcx: &WfCheckingCtxt<'_, 'tcx>, span: Span, def_id
struct CountParams {
params: FxHashSet<u32>,
}
impl<'tcx> ty::visit::TypeVisitor<'tcx> for CountParams {
impl<'tcx> ty::visit::TypeVisitor<TyCtxt<'tcx>> for CountParams {
type BreakTy = ();

fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
Expand Down
2 changes: 1 addition & 1 deletion compiler/rustc_hir_analysis/src/coherence/orphan.rs
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Expand Up @@ -552,7 +552,7 @@ fn fast_reject_auto_impl<'tcx>(tcx: TyCtxt<'tcx>, trait_def_id: DefId, self_ty:
seen: FxHashSet<DefId>,
}

impl<'tcx> TypeVisitor<'tcx> for DisableAutoTraitVisitor<'tcx> {
impl<'tcx> TypeVisitor<TyCtxt<'tcx>> for DisableAutoTraitVisitor<'tcx> {
type BreakTy = ();
fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
let tcx = self.tcx;
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2 changes: 1 addition & 1 deletion compiler/rustc_hir_analysis/src/collect/lifetimes.rs
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Expand Up @@ -1752,7 +1752,7 @@ fn is_late_bound_map(

use std::ops::ControlFlow;
use ty::Ty;
impl<'tcx> TypeVisitor<'tcx> for ConstrainedCollectorPostAstConv {
impl<'tcx> TypeVisitor<TyCtxt<'tcx>> for ConstrainedCollectorPostAstConv {
fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<!> {
match t.kind() {
ty::Param(param_ty) => {
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2 changes: 1 addition & 1 deletion compiler/rustc_hir_analysis/src/collect/type_of.rs
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Expand Up @@ -850,7 +850,7 @@ fn infer_placeholder_type<'a>(
tcx: TyCtxt<'tcx>,
}

impl<'tcx> TypeFolder<'tcx> for MakeNameable<'tcx> {
impl<'tcx> TypeFolder<TyCtxt<'tcx>> for MakeNameable<'tcx> {
fn tcx(&self) -> TyCtxt<'tcx> {
self.tcx
}
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4 changes: 2 additions & 2 deletions compiler/rustc_hir_analysis/src/constrained_generic_params.rs
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Expand Up @@ -43,7 +43,7 @@ pub fn parameters_for_impl<'tcx>(
/// of parameters whose values are needed in order to constrain `ty` - these
/// differ, with the latter being a superset, in the presence of projections.
pub fn parameters_for<'tcx>(
t: &impl TypeVisitable<'tcx>,
t: &impl TypeVisitable<TyCtxt<'tcx>>,
include_nonconstraining: bool,
) -> Vec<Parameter> {
let mut collector = ParameterCollector { parameters: vec![], include_nonconstraining };
Expand All @@ -56,7 +56,7 @@ struct ParameterCollector {
include_nonconstraining: bool,
}

impl<'tcx> TypeVisitor<'tcx> for ParameterCollector {
impl<'tcx> TypeVisitor<TyCtxt<'tcx>> for ParameterCollector {
fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
match *t.kind() {
ty::Alias(ty::Projection, ..) if !self.include_nonconstraining => {
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2 changes: 1 addition & 1 deletion compiler/rustc_hir_analysis/src/hir_wf_check.rs
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Expand Up @@ -189,7 +189,7 @@ struct EraseAllBoundRegions<'tcx> {
// us an inaccurate span for an error message, but cannot
// lead to unsoundness (we call `delay_span_bug` at the start
// of `diagnostic_hir_wf_check`).
impl<'tcx> TypeFolder<'tcx> for EraseAllBoundRegions<'tcx> {
impl<'tcx> TypeFolder<TyCtxt<'tcx>> for EraseAllBoundRegions<'tcx> {
fn tcx<'a>(&'a self) -> TyCtxt<'tcx> {
self.tcx
}
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2 changes: 1 addition & 1 deletion compiler/rustc_hir_analysis/src/variance/mod.rs
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Expand Up @@ -99,7 +99,7 @@ fn variance_of_opaque(tcx: TyCtxt<'_>, item_def_id: LocalDefId) -> &[ty::Varianc
}
}

impl<'tcx> ty::TypeVisitor<'tcx> for OpaqueTypeLifetimeCollector<'tcx> {
impl<'tcx> ty::TypeVisitor<TyCtxt<'tcx>> for OpaqueTypeLifetimeCollector<'tcx> {
#[instrument(level = "trace", skip(self), ret)]
fn visit_region(&mut self, r: ty::Region<'tcx>) -> ControlFlow<Self::BreakTy> {
if let ty::RegionKind::ReEarlyBound(ebr) = r.kind() {
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