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Commit | Line | Data |
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f9f354fc XL |
1 | //! Contains the logic to lower rustc types into Chalk types |
2 | //! | |
3 | //! In many cases there is a 1:1 relationship between a rustc type and a Chalk type. | |
4 | //! For example, a `SubstsRef` maps almost directly to a `Substitution`. In some | |
5 | //! other cases, such as `Param`s, there is no Chalk type, so we have to handle | |
6 | //! accordingly. | |
7 | //! | |
8 | //! ## `Ty` lowering | |
9 | //! Much of the `Ty` lowering is 1:1 with Chalk. (Or will be eventually). A | |
10 | //! helpful table for what types lower to what can be found in the | |
136023e0 | 11 | //! [Chalk book](https://rust-lang.github.io/chalk/book/types/rust_types.html). |
f9f354fc XL |
12 | //! The most notable difference lies with `Param`s. To convert from rustc to |
13 | //! Chalk, we eagerly and deeply convert `Param`s to placeholders (in goals) or | |
14 | //! bound variables (for clause generation through functions in `db`). | |
15 | //! | |
16 | //! ## `Region` lowering | |
17 | //! Regions are handled in rustc and Chalk is quite differently. In rustc, there | |
18 | //! is a difference between "early bound" and "late bound" regions, where only | |
19 | //! the late bound regions have a `DebruijnIndex`. Moreover, in Chalk all | |
20 | //! regions (Lifetimes) have an associated index. In rustc, only `BrAnon`s have | |
21 | //! an index, whereas `BrNamed` don't. In order to lower regions to Chalk, we | |
22 | //! convert all regions into `BrAnon` late-bound regions. | |
23 | //! | |
24 | //! ## `Const` lowering | |
25 | //! Chalk doesn't handle consts currently, so consts are currently lowered to | |
26 | //! an empty tuple. | |
27 | //! | |
28 | //! ## Bound variable collection | |
29 | //! Another difference between rustc and Chalk lies in the handling of binders. | |
30 | //! Chalk requires that we store the bound parameter kinds, whereas rustc does | |
31 | //! not. To lower anything wrapped in a `Binder`, we first deeply find any bound | |
32 | //! variables from the current `Binder`. | |
33 | ||
29967ef6 | 34 | use rustc_ast::ast; |
1b1a35ee | 35 | use rustc_middle::traits::{ChalkEnvironmentAndGoal, ChalkRustInterner as RustInterner}; |
f035d41b | 36 | use rustc_middle::ty::subst::{GenericArg, GenericArgKind, SubstsRef}; |
923072b8 | 37 | use rustc_middle::ty::{ |
064997fb FG |
38 | self, Binder, Region, Ty, TyCtxt, TypeFoldable, TypeFolder, TypeSuperFoldable, |
39 | TypeSuperVisitable, TypeVisitable, TypeVisitor, | |
923072b8 | 40 | }; |
f9f354fc XL |
41 | use rustc_span::def_id::DefId; |
42 | ||
1b1a35ee XL |
43 | use chalk_ir::{FnSig, ForeignDefId}; |
44 | use rustc_hir::Unsafety; | |
f9f354fc | 45 | use std::collections::btree_map::{BTreeMap, Entry}; |
29967ef6 | 46 | use std::ops::ControlFlow; |
f9f354fc XL |
47 | |
48 | /// Essentially an `Into` with a `&RustInterner` parameter | |
923072b8 | 49 | pub(crate) trait LowerInto<'tcx, T> { |
f9f354fc | 50 | /// Lower a rustc construct (e.g., `ty::TraitPredicate`) to a chalk type, consuming `self`. |
a2a8927a | 51 | fn lower_into(self, interner: RustInterner<'tcx>) -> T; |
f9f354fc XL |
52 | } |
53 | ||
54 | impl<'tcx> LowerInto<'tcx, chalk_ir::Substitution<RustInterner<'tcx>>> for SubstsRef<'tcx> { | |
55 | fn lower_into( | |
56 | self, | |
a2a8927a | 57 | interner: RustInterner<'tcx>, |
f9f354fc | 58 | ) -> chalk_ir::Substitution<RustInterner<'tcx>> { |
1b1a35ee XL |
59 | chalk_ir::Substitution::from_iter(interner, self.iter().map(|s| s.lower_into(interner))) |
60 | } | |
61 | } | |
62 | ||
63 | impl<'tcx> LowerInto<'tcx, SubstsRef<'tcx>> for &chalk_ir::Substitution<RustInterner<'tcx>> { | |
a2a8927a | 64 | fn lower_into(self, interner: RustInterner<'tcx>) -> SubstsRef<'tcx> { |
1b1a35ee | 65 | interner.tcx.mk_substs(self.iter(interner).map(|subst| subst.lower_into(interner))) |
f9f354fc XL |
66 | } |
67 | } | |
68 | ||
f9f354fc XL |
69 | impl<'tcx> LowerInto<'tcx, chalk_ir::InEnvironment<chalk_ir::Goal<RustInterner<'tcx>>>> |
70 | for ChalkEnvironmentAndGoal<'tcx> | |
71 | { | |
72 | fn lower_into( | |
73 | self, | |
a2a8927a | 74 | interner: RustInterner<'tcx>, |
f9f354fc | 75 | ) -> chalk_ir::InEnvironment<chalk_ir::Goal<RustInterner<'tcx>>> { |
1b1a35ee | 76 | let clauses = self.environment.into_iter().map(|predicate| { |
5869c6ff XL |
77 | let (predicate, binders, _named_regions) = |
78 | collect_bound_vars(interner, interner.tcx, predicate.kind()); | |
1b1a35ee | 79 | let consequence = match predicate { |
5869c6ff | 80 | ty::PredicateKind::TypeWellFormedFromEnv(ty) => { |
1b1a35ee | 81 | chalk_ir::DomainGoal::FromEnv(chalk_ir::FromEnv::Ty(ty.lower_into(interner))) |
f9f354fc | 82 | } |
487cf647 FG |
83 | ty::PredicateKind::Clause(ty::Clause::Trait(predicate)) => { |
84 | chalk_ir::DomainGoal::FromEnv(chalk_ir::FromEnv::Trait( | |
85 | predicate.trait_ref.lower_into(interner), | |
86 | )) | |
87 | } | |
88 | ty::PredicateKind::Clause(ty::Clause::RegionOutlives(predicate)) => { | |
89 | chalk_ir::DomainGoal::Holds(chalk_ir::WhereClause::LifetimeOutlives( | |
90 | chalk_ir::LifetimeOutlives { | |
91 | a: predicate.0.lower_into(interner), | |
92 | b: predicate.1.lower_into(interner), | |
93 | }, | |
94 | )) | |
95 | } | |
96 | ty::PredicateKind::Clause(ty::Clause::TypeOutlives(predicate)) => { | |
97 | chalk_ir::DomainGoal::Holds(chalk_ir::WhereClause::TypeOutlives( | |
98 | chalk_ir::TypeOutlives { | |
99 | ty: predicate.0.lower_into(interner), | |
100 | lifetime: predicate.1.lower_into(interner), | |
101 | }, | |
102 | )) | |
103 | } | |
104 | ty::PredicateKind::Clause(ty::Clause::Projection(predicate)) => { | |
105 | chalk_ir::DomainGoal::Holds(chalk_ir::WhereClause::AliasEq( | |
106 | predicate.lower_into(interner), | |
107 | )) | |
108 | } | |
064997fb FG |
109 | ty::PredicateKind::WellFormed(arg) => match arg.unpack() { |
110 | ty::GenericArgKind::Type(ty) => chalk_ir::DomainGoal::WellFormed( | |
111 | chalk_ir::WellFormed::Ty(ty.lower_into(interner)), | |
112 | ), | |
113 | // FIXME(chalk): we need to change `WellFormed` in Chalk to take a `GenericArg` | |
114 | _ => chalk_ir::DomainGoal::WellFormed(chalk_ir::WellFormed::Ty( | |
115 | interner.tcx.types.unit.lower_into(interner), | |
116 | )), | |
117 | }, | |
118 | ty::PredicateKind::ObjectSafe(..) | |
5869c6ff XL |
119 | | ty::PredicateKind::ClosureKind(..) |
120 | | ty::PredicateKind::Subtype(..) | |
94222f64 | 121 | | ty::PredicateKind::Coerce(..) |
5869c6ff | 122 | | ty::PredicateKind::ConstEvaluatable(..) |
487cf647 | 123 | | ty::PredicateKind::Ambiguous |
5869c6ff | 124 | | ty::PredicateKind::ConstEquate(..) => bug!("unexpected predicate {}", predicate), |
1b1a35ee XL |
125 | }; |
126 | let value = chalk_ir::ProgramClauseImplication { | |
127 | consequence, | |
128 | conditions: chalk_ir::Goals::empty(interner), | |
129 | priority: chalk_ir::ClausePriority::High, | |
130 | constraints: chalk_ir::Constraints::empty(interner), | |
131 | }; | |
132 | chalk_ir::ProgramClauseData(chalk_ir::Binders::new(binders, value)).intern(interner) | |
f9f354fc XL |
133 | }); |
134 | ||
a2a8927a | 135 | let goal: chalk_ir::GoalData<RustInterner<'tcx>> = self.goal.lower_into(interner); |
f9f354fc XL |
136 | chalk_ir::InEnvironment { |
137 | environment: chalk_ir::Environment { | |
a2a8927a | 138 | clauses: chalk_ir::ProgramClauses::from_iter(interner, clauses), |
f9f354fc | 139 | }, |
a2a8927a | 140 | goal: goal.intern(interner), |
f9f354fc XL |
141 | } |
142 | } | |
143 | } | |
144 | ||
145 | impl<'tcx> LowerInto<'tcx, chalk_ir::GoalData<RustInterner<'tcx>>> for ty::Predicate<'tcx> { | |
a2a8927a | 146 | fn lower_into(self, interner: RustInterner<'tcx>) -> chalk_ir::GoalData<RustInterner<'tcx>> { |
5869c6ff XL |
147 | let (predicate, binders, _named_regions) = |
148 | collect_bound_vars(interner, interner.tcx, self.kind()); | |
1b1a35ee XL |
149 | |
150 | let value = match predicate { | |
487cf647 | 151 | ty::PredicateKind::Clause(ty::Clause::Trait(predicate)) => { |
1b1a35ee XL |
152 | chalk_ir::GoalData::DomainGoal(chalk_ir::DomainGoal::Holds( |
153 | chalk_ir::WhereClause::Implemented(predicate.trait_ref.lower_into(interner)), | |
154 | )) | |
3dfed10e | 155 | } |
487cf647 | 156 | ty::PredicateKind::Clause(ty::Clause::RegionOutlives(predicate)) => { |
1b1a35ee XL |
157 | chalk_ir::GoalData::DomainGoal(chalk_ir::DomainGoal::Holds( |
158 | chalk_ir::WhereClause::LifetimeOutlives(chalk_ir::LifetimeOutlives { | |
159 | a: predicate.0.lower_into(interner), | |
160 | b: predicate.1.lower_into(interner), | |
161 | }), | |
162 | )) | |
f9f354fc | 163 | } |
487cf647 | 164 | ty::PredicateKind::Clause(ty::Clause::TypeOutlives(predicate)) => { |
1b1a35ee XL |
165 | chalk_ir::GoalData::DomainGoal(chalk_ir::DomainGoal::Holds( |
166 | chalk_ir::WhereClause::TypeOutlives(chalk_ir::TypeOutlives { | |
167 | ty: predicate.0.lower_into(interner), | |
168 | lifetime: predicate.1.lower_into(interner), | |
169 | }), | |
170 | )) | |
f9f354fc | 171 | } |
487cf647 | 172 | ty::PredicateKind::Clause(ty::Clause::Projection(predicate)) => { |
1b1a35ee XL |
173 | chalk_ir::GoalData::DomainGoal(chalk_ir::DomainGoal::Holds( |
174 | chalk_ir::WhereClause::AliasEq(predicate.lower_into(interner)), | |
175 | )) | |
3dfed10e | 176 | } |
5869c6ff | 177 | ty::PredicateKind::WellFormed(arg) => match arg.unpack() { |
1b1a35ee | 178 | GenericArgKind::Type(ty) => match ty.kind() { |
f035d41b XL |
179 | // FIXME(chalk): In Chalk, a placeholder is WellFormed if it |
180 | // `FromEnv`. However, when we "lower" Params, we don't update | |
181 | // the environment. | |
1b1a35ee XL |
182 | ty::Placeholder(..) => { |
183 | chalk_ir::GoalData::All(chalk_ir::Goals::empty(interner)) | |
3dfed10e | 184 | } |
1b1a35ee XL |
185 | |
186 | _ => chalk_ir::GoalData::DomainGoal(chalk_ir::DomainGoal::WellFormed( | |
187 | chalk_ir::WellFormed::Ty(ty.lower_into(interner)), | |
188 | )), | |
f035d41b XL |
189 | }, |
190 | // FIXME(chalk): handle well formed consts | |
191 | GenericArgKind::Const(..) => { | |
1b1a35ee | 192 | chalk_ir::GoalData::All(chalk_ir::Goals::empty(interner)) |
f9f354fc | 193 | } |
f2b60f7d | 194 | GenericArgKind::Lifetime(lt) => bug!("unexpected well formed predicate: {:?}", lt), |
f9f354fc XL |
195 | }, |
196 | ||
5869c6ff | 197 | ty::PredicateKind::ObjectSafe(t) => chalk_ir::GoalData::DomainGoal( |
3dfed10e | 198 | chalk_ir::DomainGoal::ObjectSafe(chalk_ir::TraitId(t)), |
f035d41b XL |
199 | ), |
200 | ||
5099ac24 FG |
201 | ty::PredicateKind::Subtype(ty::SubtypePredicate { a, b, a_is_expected: _ }) => { |
202 | chalk_ir::GoalData::SubtypeGoal(chalk_ir::SubtypeGoal { | |
203 | a: a.lower_into(interner), | |
204 | b: b.lower_into(interner), | |
205 | }) | |
206 | } | |
207 | ||
f9f354fc XL |
208 | // FIXME(chalk): other predicates |
209 | // | |
210 | // We can defer this, but ultimately we'll want to express | |
211 | // some of these in terms of chalk operations. | |
5869c6ff | 212 | ty::PredicateKind::ClosureKind(..) |
94222f64 | 213 | | ty::PredicateKind::Coerce(..) |
5869c6ff | 214 | | ty::PredicateKind::ConstEvaluatable(..) |
487cf647 | 215 | | ty::PredicateKind::Ambiguous |
5869c6ff | 216 | | ty::PredicateKind::ConstEquate(..) => { |
1b1a35ee | 217 | chalk_ir::GoalData::All(chalk_ir::Goals::empty(interner)) |
f9f354fc | 218 | } |
5869c6ff | 219 | ty::PredicateKind::TypeWellFormedFromEnv(ty) => chalk_ir::GoalData::DomainGoal( |
1b1a35ee XL |
220 | chalk_ir::DomainGoal::FromEnv(chalk_ir::FromEnv::Ty(ty.lower_into(interner))), |
221 | ), | |
222 | }; | |
223 | ||
224 | chalk_ir::GoalData::Quantified( | |
225 | chalk_ir::QuantifierKind::ForAll, | |
226 | chalk_ir::Binders::new(binders, value.intern(interner)), | |
227 | ) | |
f9f354fc XL |
228 | } |
229 | } | |
230 | ||
231 | impl<'tcx> LowerInto<'tcx, chalk_ir::TraitRef<RustInterner<'tcx>>> | |
232 | for rustc_middle::ty::TraitRef<'tcx> | |
233 | { | |
a2a8927a | 234 | fn lower_into(self, interner: RustInterner<'tcx>) -> chalk_ir::TraitRef<RustInterner<'tcx>> { |
f9f354fc | 235 | chalk_ir::TraitRef { |
f035d41b | 236 | trait_id: chalk_ir::TraitId(self.def_id), |
f9f354fc XL |
237 | substitution: self.substs.lower_into(interner), |
238 | } | |
239 | } | |
240 | } | |
241 | ||
f9f354fc XL |
242 | impl<'tcx> LowerInto<'tcx, chalk_ir::AliasEq<RustInterner<'tcx>>> |
243 | for rustc_middle::ty::ProjectionPredicate<'tcx> | |
244 | { | |
a2a8927a | 245 | fn lower_into(self, interner: RustInterner<'tcx>) -> chalk_ir::AliasEq<RustInterner<'tcx>> { |
5099ac24 | 246 | // FIXME(associated_const_equality): teach chalk about terms for alias eq. |
f9f354fc | 247 | chalk_ir::AliasEq { |
5099ac24 | 248 | ty: self.term.ty().unwrap().lower_into(interner), |
9c376795 FG |
249 | alias: chalk_ir::AliasTy::Projection(chalk_ir::ProjectionTy { |
250 | associated_ty_id: chalk_ir::AssocTypeId(self.projection_ty.def_id), | |
251 | substitution: self.projection_ty.substs.lower_into(interner), | |
252 | }), | |
f9f354fc XL |
253 | } |
254 | } | |
255 | } | |
256 | ||
5099ac24 FG |
257 | /* |
258 | // FIXME(...): Where do I add this to Chalk? I can't find it in the rustc repo anywhere. | |
259 | impl<'tcx> LowerInto<'tcx, chalk_ir::Term<RustInterner<'tcx>>> for rustc_middle::ty::Term<'tcx> { | |
260 | fn lower_into(self, interner: RustInterner<'tcx>) -> chalk_ir::Term<RustInterner<'tcx>> { | |
261 | match self { | |
262 | ty::Term::Ty(ty) => ty.lower_into(interner).into(), | |
263 | ty::Term::Const(c) => c.lower_into(interner).into(), | |
264 | } | |
265 | } | |
266 | } | |
267 | */ | |
268 | ||
f9f354fc | 269 | impl<'tcx> LowerInto<'tcx, chalk_ir::Ty<RustInterner<'tcx>>> for Ty<'tcx> { |
a2a8927a | 270 | fn lower_into(self, interner: RustInterner<'tcx>) -> chalk_ir::Ty<RustInterner<'tcx>> { |
29967ef6 XL |
271 | let int = |i| chalk_ir::TyKind::Scalar(chalk_ir::Scalar::Int(i)); |
272 | let uint = |i| chalk_ir::TyKind::Scalar(chalk_ir::Scalar::Uint(i)); | |
273 | let float = |f| chalk_ir::TyKind::Scalar(chalk_ir::Scalar::Float(f)); | |
f9f354fc | 274 | |
1b1a35ee | 275 | match *self.kind() { |
29967ef6 XL |
276 | ty::Bool => chalk_ir::TyKind::Scalar(chalk_ir::Scalar::Bool), |
277 | ty::Char => chalk_ir::TyKind::Scalar(chalk_ir::Scalar::Char), | |
278 | ty::Int(ty) => match ty { | |
5869c6ff XL |
279 | ty::IntTy::Isize => int(chalk_ir::IntTy::Isize), |
280 | ty::IntTy::I8 => int(chalk_ir::IntTy::I8), | |
281 | ty::IntTy::I16 => int(chalk_ir::IntTy::I16), | |
282 | ty::IntTy::I32 => int(chalk_ir::IntTy::I32), | |
283 | ty::IntTy::I64 => int(chalk_ir::IntTy::I64), | |
284 | ty::IntTy::I128 => int(chalk_ir::IntTy::I128), | |
f9f354fc | 285 | }, |
29967ef6 | 286 | ty::Uint(ty) => match ty { |
5869c6ff XL |
287 | ty::UintTy::Usize => uint(chalk_ir::UintTy::Usize), |
288 | ty::UintTy::U8 => uint(chalk_ir::UintTy::U8), | |
289 | ty::UintTy::U16 => uint(chalk_ir::UintTy::U16), | |
290 | ty::UintTy::U32 => uint(chalk_ir::UintTy::U32), | |
291 | ty::UintTy::U64 => uint(chalk_ir::UintTy::U64), | |
292 | ty::UintTy::U128 => uint(chalk_ir::UintTy::U128), | |
f9f354fc | 293 | }, |
29967ef6 | 294 | ty::Float(ty) => match ty { |
5869c6ff XL |
295 | ty::FloatTy::F32 => float(chalk_ir::FloatTy::F32), |
296 | ty::FloatTy::F64 => float(chalk_ir::FloatTy::F64), | |
f9f354fc | 297 | }, |
29967ef6 XL |
298 | ty::Adt(def, substs) => { |
299 | chalk_ir::TyKind::Adt(chalk_ir::AdtId(def), substs.lower_into(interner)) | |
f035d41b | 300 | } |
29967ef6 XL |
301 | ty::Foreign(def_id) => chalk_ir::TyKind::Foreign(ForeignDefId(def_id)), |
302 | ty::Str => chalk_ir::TyKind::Str, | |
303 | ty::Array(ty, len) => { | |
304 | chalk_ir::TyKind::Array(ty.lower_into(interner), len.lower_into(interner)) | |
f035d41b | 305 | } |
29967ef6 XL |
306 | ty::Slice(ty) => chalk_ir::TyKind::Slice(ty.lower_into(interner)), |
307 | ||
308 | ty::RawPtr(ptr) => { | |
309 | chalk_ir::TyKind::Raw(ptr.mutbl.lower_into(interner), ptr.ty.lower_into(interner)) | |
f035d41b | 310 | } |
29967ef6 XL |
311 | ty::Ref(region, ty, mutability) => chalk_ir::TyKind::Ref( |
312 | mutability.lower_into(interner), | |
313 | region.lower_into(interner), | |
314 | ty.lower_into(interner), | |
f9f354fc | 315 | ), |
29967ef6 XL |
316 | ty::FnDef(def_id, substs) => { |
317 | chalk_ir::TyKind::FnDef(chalk_ir::FnDefId(def_id), substs.lower_into(interner)) | |
318 | } | |
319 | ty::FnPtr(sig) => { | |
f9f354fc | 320 | let (inputs_and_outputs, binders, _named_regions) = |
fc512014 | 321 | collect_bound_vars(interner, interner.tcx, sig.inputs_and_output()); |
29967ef6 | 322 | chalk_ir::TyKind::Function(chalk_ir::FnPointer { |
f9f354fc | 323 | num_binders: binders.len(interner), |
1b1a35ee | 324 | sig: sig.lower_into(interner), |
5869c6ff | 325 | substitution: chalk_ir::FnSubst(chalk_ir::Substitution::from_iter( |
f9f354fc XL |
326 | interner, |
327 | inputs_and_outputs.iter().map(|ty| { | |
f035d41b | 328 | chalk_ir::GenericArgData::Ty(ty.lower_into(interner)).intern(interner) |
f9f354fc | 329 | }), |
5869c6ff | 330 | )), |
f9f354fc | 331 | }) |
f9f354fc | 332 | } |
f2b60f7d FG |
333 | // FIXME(dyn-star): handle the dynamic kind (dyn or dyn*) |
334 | ty::Dynamic(predicates, region, _kind) => chalk_ir::TyKind::Dyn(chalk_ir::DynTy { | |
f035d41b XL |
335 | bounds: predicates.lower_into(interner), |
336 | lifetime: region.lower_into(interner), | |
29967ef6 XL |
337 | }), |
338 | ty::Closure(def_id, substs) => { | |
339 | chalk_ir::TyKind::Closure(chalk_ir::ClosureId(def_id), substs.lower_into(interner)) | |
f9f354fc | 340 | } |
5e7ed085 FG |
341 | ty::Generator(def_id, substs, _) => chalk_ir::TyKind::Generator( |
342 | chalk_ir::GeneratorId(def_id), | |
343 | substs.lower_into(interner), | |
344 | ), | |
29967ef6 XL |
345 | ty::GeneratorWitness(_) => unimplemented!(), |
346 | ty::Never => chalk_ir::TyKind::Never, | |
5e7ed085 FG |
347 | ty::Tuple(types) => { |
348 | chalk_ir::TyKind::Tuple(types.len(), types.as_substs().lower_into(interner)) | |
349 | } | |
9c376795 FG |
350 | ty::Alias(ty::Projection, ty::AliasTy { def_id, substs, .. }) => { |
351 | chalk_ir::TyKind::Alias(chalk_ir::AliasTy::Projection(chalk_ir::ProjectionTy { | |
352 | associated_ty_id: chalk_ir::AssocTypeId(def_id), | |
353 | substitution: substs.lower_into(interner), | |
354 | })) | |
355 | } | |
356 | ty::Alias(ty::Opaque, ty::AliasTy { def_id, substs, .. }) => { | |
29967ef6 | 357 | chalk_ir::TyKind::Alias(chalk_ir::AliasTy::Opaque(chalk_ir::OpaqueTy { |
f035d41b XL |
358 | opaque_ty_id: chalk_ir::OpaqueTyId(def_id), |
359 | substitution: substs.lower_into(interner), | |
360 | })) | |
f035d41b | 361 | } |
f9f354fc XL |
362 | // This should have been done eagerly prior to this, and all Params |
363 | // should have been substituted to placeholders | |
29967ef6 XL |
364 | ty::Param(_) => panic!("Lowering Param when not expected."), |
365 | ty::Bound(db, bound) => chalk_ir::TyKind::BoundVar(chalk_ir::BoundVar::new( | |
f9f354fc XL |
366 | chalk_ir::DebruijnIndex::new(db.as_u32()), |
367 | bound.var.index(), | |
29967ef6 XL |
368 | )), |
369 | ty::Placeholder(_placeholder) => { | |
370 | chalk_ir::TyKind::Placeholder(chalk_ir::PlaceholderIndex { | |
371 | ui: chalk_ir::UniverseIndex { counter: _placeholder.universe.as_usize() }, | |
372 | idx: _placeholder.name.as_usize(), | |
373 | }) | |
374 | } | |
375 | ty::Infer(_infer) => unimplemented!(), | |
376 | ty::Error(_) => chalk_ir::TyKind::Error, | |
f9f354fc | 377 | } |
29967ef6 | 378 | .intern(interner) |
f9f354fc XL |
379 | } |
380 | } | |
381 | ||
1b1a35ee | 382 | impl<'tcx> LowerInto<'tcx, Ty<'tcx>> for &chalk_ir::Ty<RustInterner<'tcx>> { |
a2a8927a | 383 | fn lower_into(self, interner: RustInterner<'tcx>) -> Ty<'tcx> { |
29967ef6 | 384 | use chalk_ir::TyKind; |
1b1a35ee | 385 | |
29967ef6 XL |
386 | let kind = match self.kind(interner) { |
387 | TyKind::Adt(struct_id, substitution) => { | |
388 | ty::Adt(struct_id.0, substitution.lower_into(interner)) | |
389 | } | |
390 | TyKind::Scalar(scalar) => match scalar { | |
391 | chalk_ir::Scalar::Bool => ty::Bool, | |
392 | chalk_ir::Scalar::Char => ty::Char, | |
393 | chalk_ir::Scalar::Int(int_ty) => match int_ty { | |
5869c6ff XL |
394 | chalk_ir::IntTy::Isize => ty::Int(ty::IntTy::Isize), |
395 | chalk_ir::IntTy::I8 => ty::Int(ty::IntTy::I8), | |
396 | chalk_ir::IntTy::I16 => ty::Int(ty::IntTy::I16), | |
397 | chalk_ir::IntTy::I32 => ty::Int(ty::IntTy::I32), | |
398 | chalk_ir::IntTy::I64 => ty::Int(ty::IntTy::I64), | |
399 | chalk_ir::IntTy::I128 => ty::Int(ty::IntTy::I128), | |
29967ef6 XL |
400 | }, |
401 | chalk_ir::Scalar::Uint(int_ty) => match int_ty { | |
5869c6ff XL |
402 | chalk_ir::UintTy::Usize => ty::Uint(ty::UintTy::Usize), |
403 | chalk_ir::UintTy::U8 => ty::Uint(ty::UintTy::U8), | |
404 | chalk_ir::UintTy::U16 => ty::Uint(ty::UintTy::U16), | |
405 | chalk_ir::UintTy::U32 => ty::Uint(ty::UintTy::U32), | |
406 | chalk_ir::UintTy::U64 => ty::Uint(ty::UintTy::U64), | |
407 | chalk_ir::UintTy::U128 => ty::Uint(ty::UintTy::U128), | |
29967ef6 XL |
408 | }, |
409 | chalk_ir::Scalar::Float(float_ty) => match float_ty { | |
5869c6ff XL |
410 | chalk_ir::FloatTy::F32 => ty::Float(ty::FloatTy::F32), |
411 | chalk_ir::FloatTy::F64 => ty::Float(ty::FloatTy::F64), | |
1b1a35ee | 412 | }, |
1b1a35ee | 413 | }, |
29967ef6 XL |
414 | TyKind::Array(ty, c) => { |
415 | let ty = ty.lower_into(interner); | |
416 | let c = c.lower_into(interner); | |
5099ac24 | 417 | ty::Array(ty, c) |
29967ef6 XL |
418 | } |
419 | TyKind::FnDef(id, substitution) => ty::FnDef(id.0, substitution.lower_into(interner)), | |
420 | TyKind::Closure(closure, substitution) => { | |
421 | ty::Closure(closure.0, substitution.lower_into(interner)) | |
422 | } | |
487cf647 FG |
423 | TyKind::Generator(generator, substitution) => ty::Generator( |
424 | generator.0, | |
425 | substitution.lower_into(interner), | |
426 | ast::Movability::Static, | |
427 | ), | |
29967ef6 XL |
428 | TyKind::GeneratorWitness(..) => unimplemented!(), |
429 | TyKind::Never => ty::Never, | |
5e7ed085 FG |
430 | TyKind::Tuple(_len, substitution) => { |
431 | ty::Tuple(substitution.lower_into(interner).try_as_type_list().unwrap()) | |
432 | } | |
29967ef6 XL |
433 | TyKind::Slice(ty) => ty::Slice(ty.lower_into(interner)), |
434 | TyKind::Raw(mutbl, ty) => ty::RawPtr(ty::TypeAndMut { | |
435 | ty: ty.lower_into(interner), | |
436 | mutbl: mutbl.lower_into(interner), | |
437 | }), | |
438 | TyKind::Ref(mutbl, lifetime, ty) => ty::Ref( | |
439 | lifetime.lower_into(interner), | |
440 | ty.lower_into(interner), | |
441 | mutbl.lower_into(interner), | |
442 | ), | |
443 | TyKind::Str => ty::Str, | |
9c376795 FG |
444 | TyKind::OpaqueType(opaque_ty, substitution) => ty::Alias( |
445 | ty::Opaque, | |
446 | interner.tcx.mk_alias_ty(opaque_ty.0, substitution.lower_into(interner)), | |
447 | ), | |
448 | TyKind::AssociatedType(assoc_ty, substitution) => ty::Alias( | |
449 | ty::Projection, | |
450 | interner.tcx.mk_alias_ty(assoc_ty.0, substitution.lower_into(interner)), | |
451 | ), | |
29967ef6 XL |
452 | TyKind::Foreign(def_id) => ty::Foreign(def_id.0), |
453 | TyKind::Error => return interner.tcx.ty_error(), | |
454 | TyKind::Placeholder(placeholder) => ty::Placeholder(ty::Placeholder { | |
1b1a35ee XL |
455 | universe: ty::UniverseIndex::from_usize(placeholder.ui.counter), |
456 | name: ty::BoundVar::from_usize(placeholder.idx), | |
457 | }), | |
29967ef6 | 458 | TyKind::Alias(alias_ty) => match alias_ty { |
9c376795 FG |
459 | chalk_ir::AliasTy::Projection(projection) => ty::Alias( |
460 | ty::Projection, | |
461 | interner.tcx.mk_alias_ty( | |
462 | projection.associated_ty_id.0, | |
463 | projection.substitution.lower_into(interner), | |
464 | ), | |
465 | ), | |
466 | chalk_ir::AliasTy::Opaque(opaque) => ty::Alias( | |
467 | ty::Opaque, | |
468 | interner.tcx.mk_alias_ty( | |
469 | opaque.opaque_ty_id.0, | |
470 | opaque.substitution.lower_into(interner), | |
471 | ), | |
472 | ), | |
29967ef6 XL |
473 | }, |
474 | TyKind::Function(_quantified_ty) => unimplemented!(), | |
475 | TyKind::BoundVar(_bound) => ty::Bound( | |
1b1a35ee XL |
476 | ty::DebruijnIndex::from_usize(_bound.debruijn.depth() as usize), |
477 | ty::BoundTy { | |
478 | var: ty::BoundVar::from_usize(_bound.index), | |
479 | kind: ty::BoundTyKind::Anon, | |
480 | }, | |
481 | ), | |
29967ef6 XL |
482 | TyKind::InferenceVar(_, _) => unimplemented!(), |
483 | TyKind::Dyn(_) => unimplemented!(), | |
1b1a35ee XL |
484 | }; |
485 | interner.tcx.mk_ty(kind) | |
486 | } | |
487 | } | |
488 | ||
f9f354fc | 489 | impl<'tcx> LowerInto<'tcx, chalk_ir::Lifetime<RustInterner<'tcx>>> for Region<'tcx> { |
a2a8927a | 490 | fn lower_into(self, interner: RustInterner<'tcx>) -> chalk_ir::Lifetime<RustInterner<'tcx>> { |
5099ac24 FG |
491 | match *self { |
492 | ty::ReEarlyBound(_) => { | |
f9f354fc XL |
493 | panic!("Should have already been substituted."); |
494 | } | |
5099ac24 | 495 | ty::ReLateBound(db, br) => chalk_ir::LifetimeData::BoundVar(chalk_ir::BoundVar::new( |
cdc7bbd5 XL |
496 | chalk_ir::DebruijnIndex::new(db.as_u32()), |
497 | br.var.as_usize(), | |
498 | )) | |
499 | .intern(interner), | |
5099ac24 FG |
500 | ty::ReFree(_) => unimplemented!(), |
501 | ty::ReStatic => chalk_ir::LifetimeData::Static.intern(interner), | |
502 | ty::ReVar(_) => unimplemented!(), | |
503 | ty::RePlaceholder(placeholder_region) => { | |
f9f354fc XL |
504 | chalk_ir::LifetimeData::Placeholder(chalk_ir::PlaceholderIndex { |
505 | ui: chalk_ir::UniverseIndex { counter: placeholder_region.universe.index() }, | |
506 | idx: 0, | |
507 | }) | |
508 | .intern(interner) | |
509 | } | |
5099ac24 | 510 | ty::ReErased => chalk_ir::LifetimeData::Erased.intern(interner), |
f9f354fc XL |
511 | } |
512 | } | |
513 | } | |
514 | ||
1b1a35ee | 515 | impl<'tcx> LowerInto<'tcx, Region<'tcx>> for &chalk_ir::Lifetime<RustInterner<'tcx>> { |
a2a8927a | 516 | fn lower_into(self, interner: RustInterner<'tcx>) -> Region<'tcx> { |
1b1a35ee | 517 | let kind = match self.data(interner) { |
5099ac24 | 518 | chalk_ir::LifetimeData::BoundVar(var) => ty::ReLateBound( |
1b1a35ee | 519 | ty::DebruijnIndex::from_u32(var.debruijn.depth()), |
cdc7bbd5 XL |
520 | ty::BoundRegion { |
521 | var: ty::BoundVar::from_usize(var.index), | |
487cf647 | 522 | kind: ty::BrAnon(var.index as u32, None), |
cdc7bbd5 | 523 | }, |
1b1a35ee XL |
524 | ), |
525 | chalk_ir::LifetimeData::InferenceVar(_var) => unimplemented!(), | |
5099ac24 FG |
526 | chalk_ir::LifetimeData::Placeholder(p) => ty::RePlaceholder(ty::Placeholder { |
527 | universe: ty::UniverseIndex::from_usize(p.ui.counter), | |
487cf647 | 528 | name: ty::BoundRegionKind::BrAnon(p.idx as u32, None), |
5099ac24 FG |
529 | }), |
530 | chalk_ir::LifetimeData::Static => return interner.tcx.lifetimes.re_static, | |
5099ac24 FG |
531 | chalk_ir::LifetimeData::Erased => return interner.tcx.lifetimes.re_erased, |
532 | chalk_ir::LifetimeData::Phantom(void, _) => match *void {}, | |
1b1a35ee XL |
533 | }; |
534 | interner.tcx.mk_region(kind) | |
535 | } | |
536 | } | |
537 | ||
538 | impl<'tcx> LowerInto<'tcx, chalk_ir::Const<RustInterner<'tcx>>> for ty::Const<'tcx> { | |
a2a8927a | 539 | fn lower_into(self, interner: RustInterner<'tcx>) -> chalk_ir::Const<RustInterner<'tcx>> { |
5099ac24 | 540 | let ty = self.ty().lower_into(interner); |
923072b8 | 541 | let value = match self.kind() { |
1b1a35ee XL |
542 | ty::ConstKind::Value(val) => { |
543 | chalk_ir::ConstValue::Concrete(chalk_ir::ConcreteConst { interned: val }) | |
544 | } | |
545 | ty::ConstKind::Bound(db, bound) => chalk_ir::ConstValue::BoundVar( | |
546 | chalk_ir::BoundVar::new(chalk_ir::DebruijnIndex::new(db.as_u32()), bound.index()), | |
547 | ), | |
548 | _ => unimplemented!("Const not implemented. {:?}", self), | |
549 | }; | |
550 | chalk_ir::ConstData { ty, value }.intern(interner) | |
551 | } | |
552 | } | |
553 | ||
554 | impl<'tcx> LowerInto<'tcx, ty::Const<'tcx>> for &chalk_ir::Const<RustInterner<'tcx>> { | |
a2a8927a | 555 | fn lower_into(self, interner: RustInterner<'tcx>) -> ty::Const<'tcx> { |
1b1a35ee XL |
556 | let data = self.data(interner); |
557 | let ty = data.ty.lower_into(interner); | |
923072b8 | 558 | let kind = match data.value { |
1b1a35ee XL |
559 | chalk_ir::ConstValue::BoundVar(var) => ty::ConstKind::Bound( |
560 | ty::DebruijnIndex::from_u32(var.debruijn.depth()), | |
561 | ty::BoundVar::from_u32(var.index as u32), | |
562 | ), | |
563 | chalk_ir::ConstValue::InferenceVar(_var) => unimplemented!(), | |
564 | chalk_ir::ConstValue::Placeholder(_p) => unimplemented!(), | |
565 | chalk_ir::ConstValue::Concrete(c) => ty::ConstKind::Value(c.interned), | |
566 | }; | |
487cf647 | 567 | interner.tcx.mk_const(kind, ty) |
1b1a35ee XL |
568 | } |
569 | } | |
570 | ||
f035d41b | 571 | impl<'tcx> LowerInto<'tcx, chalk_ir::GenericArg<RustInterner<'tcx>>> for GenericArg<'tcx> { |
a2a8927a | 572 | fn lower_into(self, interner: RustInterner<'tcx>) -> chalk_ir::GenericArg<RustInterner<'tcx>> { |
f9f354fc XL |
573 | match self.unpack() { |
574 | ty::subst::GenericArgKind::Type(ty) => { | |
f035d41b | 575 | chalk_ir::GenericArgData::Ty(ty.lower_into(interner)) |
f9f354fc XL |
576 | } |
577 | ty::subst::GenericArgKind::Lifetime(lifetime) => { | |
f035d41b | 578 | chalk_ir::GenericArgData::Lifetime(lifetime.lower_into(interner)) |
f9f354fc | 579 | } |
1b1a35ee XL |
580 | ty::subst::GenericArgKind::Const(c) => { |
581 | chalk_ir::GenericArgData::Const(c.lower_into(interner)) | |
582 | } | |
f9f354fc XL |
583 | } |
584 | .intern(interner) | |
585 | } | |
586 | } | |
587 | ||
1b1a35ee XL |
588 | impl<'tcx> LowerInto<'tcx, ty::subst::GenericArg<'tcx>> |
589 | for &chalk_ir::GenericArg<RustInterner<'tcx>> | |
590 | { | |
a2a8927a | 591 | fn lower_into(self, interner: RustInterner<'tcx>) -> ty::subst::GenericArg<'tcx> { |
1b1a35ee XL |
592 | match self.data(interner) { |
593 | chalk_ir::GenericArgData::Ty(ty) => { | |
594 | let t: Ty<'tcx> = ty.lower_into(interner); | |
595 | t.into() | |
596 | } | |
597 | chalk_ir::GenericArgData::Lifetime(lifetime) => { | |
598 | let r: Region<'tcx> = lifetime.lower_into(interner); | |
599 | r.into() | |
600 | } | |
601 | chalk_ir::GenericArgData::Const(c) => { | |
602 | let c: ty::Const<'tcx> = c.lower_into(interner); | |
5099ac24 | 603 | c.into() |
1b1a35ee XL |
604 | } |
605 | } | |
606 | } | |
607 | } | |
608 | ||
f9f354fc XL |
609 | // We lower into an Option here since there are some predicates which Chalk |
610 | // doesn't have a representation for yet (as a `WhereClause`), but are so common | |
611 | // that we just are accepting the unsoundness for now. The `Option` will | |
612 | // eventually be removed. | |
613 | impl<'tcx> LowerInto<'tcx, Option<chalk_ir::QuantifiedWhereClause<RustInterner<'tcx>>>> | |
614 | for ty::Predicate<'tcx> | |
615 | { | |
616 | fn lower_into( | |
617 | self, | |
a2a8927a | 618 | interner: RustInterner<'tcx>, |
f9f354fc | 619 | ) -> Option<chalk_ir::QuantifiedWhereClause<RustInterner<'tcx>>> { |
5869c6ff XL |
620 | let (predicate, binders, _named_regions) = |
621 | collect_bound_vars(interner, interner.tcx, self.kind()); | |
1b1a35ee | 622 | let value = match predicate { |
487cf647 | 623 | ty::PredicateKind::Clause(ty::Clause::Trait(predicate)) => { |
1b1a35ee | 624 | Some(chalk_ir::WhereClause::Implemented(predicate.trait_ref.lower_into(interner))) |
f9f354fc | 625 | } |
487cf647 | 626 | ty::PredicateKind::Clause(ty::Clause::RegionOutlives(predicate)) => { |
1b1a35ee XL |
627 | Some(chalk_ir::WhereClause::LifetimeOutlives(chalk_ir::LifetimeOutlives { |
628 | a: predicate.0.lower_into(interner), | |
629 | b: predicate.1.lower_into(interner), | |
630 | })) | |
631 | } | |
487cf647 | 632 | ty::PredicateKind::Clause(ty::Clause::TypeOutlives(predicate)) => { |
1b1a35ee XL |
633 | Some(chalk_ir::WhereClause::TypeOutlives(chalk_ir::TypeOutlives { |
634 | ty: predicate.0.lower_into(interner), | |
635 | lifetime: predicate.1.lower_into(interner), | |
636 | })) | |
637 | } | |
487cf647 | 638 | ty::PredicateKind::Clause(ty::Clause::Projection(predicate)) => { |
1b1a35ee | 639 | Some(chalk_ir::WhereClause::AliasEq(predicate.lower_into(interner))) |
f035d41b | 640 | } |
5869c6ff | 641 | ty::PredicateKind::WellFormed(_ty) => None, |
3dfed10e | 642 | |
5869c6ff XL |
643 | ty::PredicateKind::ObjectSafe(..) |
644 | | ty::PredicateKind::ClosureKind(..) | |
645 | | ty::PredicateKind::Subtype(..) | |
94222f64 | 646 | | ty::PredicateKind::Coerce(..) |
5869c6ff XL |
647 | | ty::PredicateKind::ConstEvaluatable(..) |
648 | | ty::PredicateKind::ConstEquate(..) | |
487cf647 | 649 | | ty::PredicateKind::Ambiguous |
5869c6ff | 650 | | ty::PredicateKind::TypeWellFormedFromEnv(..) => { |
1b1a35ee XL |
651 | bug!("unexpected predicate {}", &self) |
652 | } | |
653 | }; | |
654 | value.map(|value| chalk_ir::Binders::new(binders, value)) | |
f9f354fc XL |
655 | } |
656 | } | |
657 | ||
f035d41b | 658 | impl<'tcx> LowerInto<'tcx, chalk_ir::Binders<chalk_ir::QuantifiedWhereClauses<RustInterner<'tcx>>>> |
487cf647 | 659 | for &'tcx ty::List<ty::PolyExistentialPredicate<'tcx>> |
f035d41b XL |
660 | { |
661 | fn lower_into( | |
662 | self, | |
a2a8927a | 663 | interner: RustInterner<'tcx>, |
f035d41b | 664 | ) -> chalk_ir::Binders<chalk_ir::QuantifiedWhereClauses<RustInterner<'tcx>>> { |
29967ef6 XL |
665 | // `Self` has one binder: |
666 | // Binder<&'tcx ty::List<ty::ExistentialPredicate<'tcx>>> | |
667 | // The return type has two: | |
668 | // Binders<&[Binders<WhereClause<I>>]> | |
669 | // This means that any variables that are escaping `self` need to be | |
670 | // shifted in by one so that they are still escaping. | |
fc512014 | 671 | let predicates = ty::fold::shift_vars(interner.tcx, self, 1); |
29967ef6 | 672 | |
1b1a35ee XL |
673 | let self_ty = interner.tcx.mk_ty(ty::Bound( |
674 | // This is going to be wrapped in a binder | |
675 | ty::DebruijnIndex::from_usize(1), | |
676 | ty::BoundTy { var: ty::BoundVar::from_usize(0), kind: ty::BoundTyKind::Anon }, | |
677 | )); | |
fc512014 XL |
678 | let where_clauses = predicates.into_iter().map(|predicate| { |
679 | let (predicate, binders, _named_regions) = | |
680 | collect_bound_vars(interner, interner.tcx, predicate); | |
681 | match predicate { | |
682 | ty::ExistentialPredicate::Trait(ty::ExistentialTraitRef { def_id, substs }) => { | |
683 | chalk_ir::Binders::new( | |
684 | binders.clone(), | |
685 | chalk_ir::WhereClause::Implemented(chalk_ir::TraitRef { | |
686 | trait_id: chalk_ir::TraitId(def_id), | |
687 | substitution: interner | |
688 | .tcx | |
689 | .mk_substs_trait(self_ty, substs) | |
690 | .lower_into(interner), | |
691 | }), | |
692 | ) | |
693 | } | |
694 | ty::ExistentialPredicate::Projection(predicate) => chalk_ir::Binders::new( | |
695 | binders.clone(), | |
696 | chalk_ir::WhereClause::AliasEq(chalk_ir::AliasEq { | |
697 | alias: chalk_ir::AliasTy::Projection(chalk_ir::ProjectionTy { | |
9c376795 | 698 | associated_ty_id: chalk_ir::AssocTypeId(predicate.def_id), |
fc512014 XL |
699 | substitution: interner |
700 | .tcx | |
701 | .mk_substs_trait(self_ty, predicate.substs) | |
702 | .lower_into(interner), | |
703 | }), | |
5099ac24 FG |
704 | // FIXME(associated_const_equality): teach chalk about terms for alias eq. |
705 | ty: predicate.term.ty().unwrap().lower_into(interner), | |
fc512014 XL |
706 | }), |
707 | ), | |
708 | ty::ExistentialPredicate::AutoTrait(def_id) => chalk_ir::Binders::new( | |
29967ef6 | 709 | binders.clone(), |
f035d41b XL |
710 | chalk_ir::WhereClause::Implemented(chalk_ir::TraitRef { |
711 | trait_id: chalk_ir::TraitId(def_id), | |
1b1a35ee XL |
712 | substitution: interner |
713 | .tcx | |
487cf647 | 714 | .mk_substs_trait(self_ty, []) |
1b1a35ee | 715 | .lower_into(interner), |
f035d41b | 716 | }), |
fc512014 | 717 | ), |
f035d41b | 718 | } |
f035d41b | 719 | }); |
29967ef6 XL |
720 | |
721 | // Binder for the bound variable representing the concrete underlying type. | |
722 | let existential_binder = chalk_ir::VariableKinds::from1( | |
723 | interner, | |
724 | chalk_ir::VariableKind::Ty(chalk_ir::TyVariableKind::General), | |
725 | ); | |
1b1a35ee | 726 | let value = chalk_ir::QuantifiedWhereClauses::from_iter(interner, where_clauses); |
29967ef6 | 727 | chalk_ir::Binders::new(existential_binder, value) |
f035d41b XL |
728 | } |
729 | } | |
730 | ||
cdc7bbd5 XL |
731 | impl<'tcx> LowerInto<'tcx, chalk_ir::FnSig<RustInterner<'tcx>>> |
732 | for ty::Binder<'tcx, ty::FnSig<'tcx>> | |
733 | { | |
a2a8927a | 734 | fn lower_into(self, _interner: RustInterner<'_>) -> FnSig<RustInterner<'tcx>> { |
1b1a35ee XL |
735 | chalk_ir::FnSig { |
736 | abi: self.abi(), | |
737 | safety: match self.unsafety() { | |
738 | Unsafety::Normal => chalk_ir::Safety::Safe, | |
739 | Unsafety::Unsafe => chalk_ir::Safety::Unsafe, | |
740 | }, | |
741 | variadic: self.c_variadic(), | |
742 | } | |
743 | } | |
744 | } | |
745 | ||
29967ef6 XL |
746 | // We lower into an Option here since there are some predicates which Chalk |
747 | // doesn't have a representation for yet (as an `InlineBound`). The `Option` will | |
748 | // eventually be removed. | |
749 | impl<'tcx> LowerInto<'tcx, Option<chalk_solve::rust_ir::QuantifiedInlineBound<RustInterner<'tcx>>>> | |
750 | for ty::Predicate<'tcx> | |
751 | { | |
752 | fn lower_into( | |
753 | self, | |
a2a8927a | 754 | interner: RustInterner<'tcx>, |
29967ef6 | 755 | ) -> Option<chalk_solve::rust_ir::QuantifiedInlineBound<RustInterner<'tcx>>> { |
5869c6ff XL |
756 | let (predicate, binders, _named_regions) = |
757 | collect_bound_vars(interner, interner.tcx, self.kind()); | |
29967ef6 | 758 | match predicate { |
487cf647 FG |
759 | ty::PredicateKind::Clause(ty::Clause::Trait(predicate)) => { |
760 | Some(chalk_ir::Binders::new( | |
761 | binders, | |
762 | chalk_solve::rust_ir::InlineBound::TraitBound( | |
763 | predicate.trait_ref.lower_into(interner), | |
764 | ), | |
765 | )) | |
766 | } | |
767 | ty::PredicateKind::Clause(ty::Clause::Projection(predicate)) => { | |
768 | Some(chalk_ir::Binders::new( | |
769 | binders, | |
770 | chalk_solve::rust_ir::InlineBound::AliasEqBound(predicate.lower_into(interner)), | |
771 | )) | |
772 | } | |
773 | ty::PredicateKind::Clause(ty::Clause::TypeOutlives(_predicate)) => None, | |
5869c6ff XL |
774 | ty::PredicateKind::WellFormed(_ty) => None, |
775 | ||
487cf647 | 776 | ty::PredicateKind::Clause(ty::Clause::RegionOutlives(..)) |
5869c6ff XL |
777 | | ty::PredicateKind::ObjectSafe(..) |
778 | | ty::PredicateKind::ClosureKind(..) | |
779 | | ty::PredicateKind::Subtype(..) | |
94222f64 | 780 | | ty::PredicateKind::Coerce(..) |
5869c6ff XL |
781 | | ty::PredicateKind::ConstEvaluatable(..) |
782 | | ty::PredicateKind::ConstEquate(..) | |
487cf647 | 783 | | ty::PredicateKind::Ambiguous |
5869c6ff | 784 | | ty::PredicateKind::TypeWellFormedFromEnv(..) => { |
29967ef6 XL |
785 | bug!("unexpected predicate {}", &self) |
786 | } | |
787 | } | |
788 | } | |
789 | } | |
790 | ||
791 | impl<'tcx> LowerInto<'tcx, chalk_solve::rust_ir::TraitBound<RustInterner<'tcx>>> | |
792 | for ty::TraitRef<'tcx> | |
793 | { | |
794 | fn lower_into( | |
795 | self, | |
a2a8927a | 796 | interner: RustInterner<'tcx>, |
29967ef6 XL |
797 | ) -> chalk_solve::rust_ir::TraitBound<RustInterner<'tcx>> { |
798 | chalk_solve::rust_ir::TraitBound { | |
799 | trait_id: chalk_ir::TraitId(self.def_id), | |
800 | args_no_self: self.substs[1..].iter().map(|arg| arg.lower_into(interner)).collect(), | |
801 | } | |
802 | } | |
803 | } | |
804 | ||
805 | impl<'tcx> LowerInto<'tcx, chalk_ir::Mutability> for ast::Mutability { | |
a2a8927a | 806 | fn lower_into(self, _interner: RustInterner<'tcx>) -> chalk_ir::Mutability { |
29967ef6 XL |
807 | match self { |
808 | rustc_ast::Mutability::Mut => chalk_ir::Mutability::Mut, | |
809 | rustc_ast::Mutability::Not => chalk_ir::Mutability::Not, | |
810 | } | |
811 | } | |
812 | } | |
813 | ||
814 | impl<'tcx> LowerInto<'tcx, ast::Mutability> for chalk_ir::Mutability { | |
a2a8927a | 815 | fn lower_into(self, _interner: RustInterner<'tcx>) -> ast::Mutability { |
29967ef6 XL |
816 | match self { |
817 | chalk_ir::Mutability::Mut => ast::Mutability::Mut, | |
818 | chalk_ir::Mutability::Not => ast::Mutability::Not, | |
819 | } | |
820 | } | |
821 | } | |
822 | ||
823 | impl<'tcx> LowerInto<'tcx, chalk_solve::rust_ir::Polarity> for ty::ImplPolarity { | |
a2a8927a | 824 | fn lower_into(self, _interner: RustInterner<'tcx>) -> chalk_solve::rust_ir::Polarity { |
29967ef6 XL |
825 | match self { |
826 | ty::ImplPolarity::Positive => chalk_solve::rust_ir::Polarity::Positive, | |
827 | ty::ImplPolarity::Negative => chalk_solve::rust_ir::Polarity::Negative, | |
828 | // FIXME(chalk) reservation impls | |
829 | ty::ImplPolarity::Reservation => chalk_solve::rust_ir::Polarity::Negative, | |
830 | } | |
831 | } | |
832 | } | |
5099ac24 FG |
833 | impl<'tcx> LowerInto<'tcx, chalk_ir::Variance> for ty::Variance { |
834 | fn lower_into(self, _interner: RustInterner<'tcx>) -> chalk_ir::Variance { | |
835 | match self { | |
836 | ty::Variance::Covariant => chalk_ir::Variance::Covariant, | |
837 | ty::Variance::Invariant => chalk_ir::Variance::Invariant, | |
838 | ty::Variance::Contravariant => chalk_ir::Variance::Contravariant, | |
839 | ty::Variance::Bivariant => unimplemented!(), | |
840 | } | |
841 | } | |
842 | } | |
29967ef6 XL |
843 | |
844 | impl<'tcx> LowerInto<'tcx, chalk_solve::rust_ir::AliasEqBound<RustInterner<'tcx>>> | |
845 | for ty::ProjectionPredicate<'tcx> | |
846 | { | |
847 | fn lower_into( | |
848 | self, | |
a2a8927a | 849 | interner: RustInterner<'tcx>, |
29967ef6 | 850 | ) -> chalk_solve::rust_ir::AliasEqBound<RustInterner<'tcx>> { |
6a06907d | 851 | let (trait_ref, own_substs) = self.projection_ty.trait_ref_and_own_substs(interner.tcx); |
29967ef6 XL |
852 | chalk_solve::rust_ir::AliasEqBound { |
853 | trait_bound: trait_ref.lower_into(interner), | |
9c376795 | 854 | associated_ty_id: chalk_ir::AssocTypeId(self.projection_ty.def_id), |
6a06907d | 855 | parameters: own_substs.iter().map(|arg| arg.lower_into(interner)).collect(), |
5099ac24 | 856 | value: self.term.ty().unwrap().lower_into(interner), |
29967ef6 XL |
857 | } |
858 | } | |
859 | } | |
860 | ||
f9f354fc | 861 | /// To collect bound vars, we have to do two passes. In the first pass, we |
fc512014 | 862 | /// collect all `BoundRegionKind`s and `ty::Bound`s. In the second pass, we then |
f9f354fc XL |
863 | /// replace `BrNamed` into `BrAnon`. The two separate passes are important, |
864 | /// since we can only replace `BrNamed` with `BrAnon`s with indices *after* all | |
865 | /// "real" `BrAnon`s. | |
866 | /// | |
867 | /// It's important to note that because of prior substitution, we may have | |
868 | /// late-bound regions, even outside of fn contexts, since this is the best way | |
869 | /// to prep types for chalk lowering. | |
923072b8 | 870 | pub(crate) fn collect_bound_vars<'tcx, T: TypeFoldable<'tcx>>( |
a2a8927a | 871 | interner: RustInterner<'tcx>, |
f9f354fc | 872 | tcx: TyCtxt<'tcx>, |
cdc7bbd5 | 873 | ty: Binder<'tcx, T>, |
f035d41b | 874 | ) -> (T, chalk_ir::VariableKinds<RustInterner<'tcx>>, BTreeMap<DefId, u32>) { |
5099ac24 | 875 | let mut bound_vars_collector = BoundVarsCollector::new(); |
f035d41b | 876 | ty.as_ref().skip_binder().visit_with(&mut bound_vars_collector); |
f9f354fc XL |
877 | let mut parameters = bound_vars_collector.parameters; |
878 | let named_parameters: BTreeMap<DefId, u32> = bound_vars_collector | |
879 | .named_parameters | |
880 | .into_iter() | |
881 | .enumerate() | |
882 | .map(|(i, def_id)| (def_id, (i + parameters.len()) as u32)) | |
883 | .collect(); | |
884 | ||
885 | let mut bound_var_substitutor = NamedBoundVarSubstitutor::new(tcx, &named_parameters); | |
fc512014 | 886 | let new_ty = ty.skip_binder().fold_with(&mut bound_var_substitutor); |
f9f354fc XL |
887 | |
888 | for var in named_parameters.values() { | |
f035d41b | 889 | parameters.insert(*var, chalk_ir::VariableKind::Lifetime); |
f9f354fc XL |
890 | } |
891 | ||
892 | (0..parameters.len()).for_each(|i| { | |
3dfed10e XL |
893 | parameters |
894 | .get(&(i as u32)) | |
fc512014 | 895 | .or_else(|| bug!("Skipped bound var index: parameters={:?}", parameters)); |
f9f354fc XL |
896 | }); |
897 | ||
1b1a35ee XL |
898 | let binders = |
899 | chalk_ir::VariableKinds::from_iter(interner, parameters.into_iter().map(|(_, v)| v)); | |
f9f354fc XL |
900 | |
901 | (new_ty, binders, named_parameters) | |
902 | } | |
903 | ||
923072b8 | 904 | pub(crate) struct BoundVarsCollector<'tcx> { |
f9f354fc | 905 | binder_index: ty::DebruijnIndex, |
923072b8 FG |
906 | pub(crate) parameters: BTreeMap<u32, chalk_ir::VariableKind<RustInterner<'tcx>>>, |
907 | pub(crate) named_parameters: Vec<DefId>, | |
f9f354fc XL |
908 | } |
909 | ||
f035d41b | 910 | impl<'tcx> BoundVarsCollector<'tcx> { |
923072b8 | 911 | pub(crate) fn new() -> Self { |
f9f354fc XL |
912 | BoundVarsCollector { |
913 | binder_index: ty::INNERMOST, | |
914 | parameters: BTreeMap::new(), | |
915 | named_parameters: vec![], | |
916 | } | |
917 | } | |
918 | } | |
919 | ||
f035d41b | 920 | impl<'tcx> TypeVisitor<'tcx> for BoundVarsCollector<'tcx> { |
064997fb | 921 | fn visit_binder<T: TypeVisitable<'tcx>>( |
cdc7bbd5 XL |
922 | &mut self, |
923 | t: &Binder<'tcx, T>, | |
924 | ) -> ControlFlow<Self::BreakTy> { | |
f9f354fc XL |
925 | self.binder_index.shift_in(1); |
926 | let result = t.super_visit_with(self); | |
927 | self.binder_index.shift_out(1); | |
928 | result | |
929 | } | |
930 | ||
fc512014 | 931 | fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> { |
1b1a35ee | 932 | match *t.kind() { |
f9f354fc XL |
933 | ty::Bound(debruijn, bound_ty) if debruijn == self.binder_index => { |
934 | match self.parameters.entry(bound_ty.var.as_u32()) { | |
935 | Entry::Vacant(entry) => { | |
29967ef6 | 936 | entry.insert(chalk_ir::VariableKind::Ty(chalk_ir::TyVariableKind::General)); |
f9f354fc | 937 | } |
f035d41b XL |
938 | Entry::Occupied(entry) => match entry.get() { |
939 | chalk_ir::VariableKind::Ty(_) => {} | |
940 | _ => panic!(), | |
941 | }, | |
f9f354fc XL |
942 | } |
943 | } | |
944 | ||
945 | _ => (), | |
946 | }; | |
947 | ||
948 | t.super_visit_with(self) | |
949 | } | |
950 | ||
fc512014 | 951 | fn visit_region(&mut self, r: Region<'tcx>) -> ControlFlow<Self::BreakTy> { |
5099ac24 FG |
952 | match *r { |
953 | ty::ReLateBound(index, br) if index == self.binder_index => match br.kind { | |
fc512014 | 954 | ty::BoundRegionKind::BrNamed(def_id, _name) => { |
c295e0f8 | 955 | if !self.named_parameters.iter().any(|d| *d == def_id) { |
fc512014 | 956 | self.named_parameters.push(def_id); |
f9f354fc XL |
957 | } |
958 | } | |
959 | ||
487cf647 | 960 | ty::BoundRegionKind::BrAnon(var, _) => match self.parameters.entry(var) { |
f9f354fc | 961 | Entry::Vacant(entry) => { |
f035d41b | 962 | entry.insert(chalk_ir::VariableKind::Lifetime); |
f9f354fc | 963 | } |
f035d41b XL |
964 | Entry::Occupied(entry) => match entry.get() { |
965 | chalk_ir::VariableKind::Lifetime => {} | |
966 | _ => panic!(), | |
967 | }, | |
f9f354fc XL |
968 | }, |
969 | ||
cdc7bbd5 | 970 | ty::BoundRegionKind::BrEnv => unimplemented!(), |
f9f354fc XL |
971 | }, |
972 | ||
973 | ty::ReEarlyBound(_re) => { | |
974 | // FIXME(chalk): jackh726 - I think we should always have already | |
975 | // substituted away `ReEarlyBound`s for `ReLateBound`s, but need to confirm. | |
976 | unimplemented!(); | |
977 | } | |
978 | ||
979 | _ => (), | |
980 | }; | |
981 | ||
982 | r.super_visit_with(self) | |
983 | } | |
984 | } | |
985 | ||
fc512014 | 986 | /// This is used to replace `BoundRegionKind::BrNamed` with `BoundRegionKind::BrAnon`. |
f9f354fc XL |
987 | /// Note: we assume that we will always have room for more bound vars. (i.e. we |
988 | /// won't ever hit the `u32` limit in `BrAnon`s). | |
989 | struct NamedBoundVarSubstitutor<'a, 'tcx> { | |
990 | tcx: TyCtxt<'tcx>, | |
991 | binder_index: ty::DebruijnIndex, | |
992 | named_parameters: &'a BTreeMap<DefId, u32>, | |
993 | } | |
994 | ||
995 | impl<'a, 'tcx> NamedBoundVarSubstitutor<'a, 'tcx> { | |
996 | fn new(tcx: TyCtxt<'tcx>, named_parameters: &'a BTreeMap<DefId, u32>) -> Self { | |
997 | NamedBoundVarSubstitutor { tcx, binder_index: ty::INNERMOST, named_parameters } | |
998 | } | |
999 | } | |
1000 | ||
1001 | impl<'a, 'tcx> TypeFolder<'tcx> for NamedBoundVarSubstitutor<'a, 'tcx> { | |
1002 | fn tcx<'b>(&'b self) -> TyCtxt<'tcx> { | |
1003 | self.tcx | |
1004 | } | |
1005 | ||
cdc7bbd5 | 1006 | fn fold_binder<T: TypeFoldable<'tcx>>(&mut self, t: Binder<'tcx, T>) -> Binder<'tcx, T> { |
f9f354fc XL |
1007 | self.binder_index.shift_in(1); |
1008 | let result = t.super_fold_with(self); | |
1009 | self.binder_index.shift_out(1); | |
1010 | result | |
1011 | } | |
1012 | ||
f9f354fc | 1013 | fn fold_region(&mut self, r: Region<'tcx>) -> Region<'tcx> { |
5099ac24 FG |
1014 | match *r { |
1015 | ty::ReLateBound(index, br) if index == self.binder_index => match br.kind { | |
fc512014 XL |
1016 | ty::BrNamed(def_id, _name) => match self.named_parameters.get(&def_id) { |
1017 | Some(idx) => { | |
487cf647 | 1018 | let new_br = ty::BoundRegion { var: br.var, kind: ty::BrAnon(*idx, None) }; |
5099ac24 | 1019 | return self.tcx.mk_region(ty::ReLateBound(index, new_br)); |
f9f354fc | 1020 | } |
fc512014 XL |
1021 | None => panic!("Missing `BrNamed`."), |
1022 | }, | |
f9f354fc | 1023 | ty::BrEnv => unimplemented!(), |
487cf647 | 1024 | ty::BrAnon(..) => {} |
f9f354fc XL |
1025 | }, |
1026 | _ => (), | |
1027 | }; | |
1028 | ||
1029 | r.super_fold_with(self) | |
1030 | } | |
1031 | } | |
1032 | ||
1033 | /// Used to substitute `Param`s with placeholders. We do this since Chalk | |
1034 | /// have a notion of `Param`s. | |
923072b8 | 1035 | pub(crate) struct ParamsSubstitutor<'tcx> { |
f9f354fc XL |
1036 | tcx: TyCtxt<'tcx>, |
1037 | binder_index: ty::DebruijnIndex, | |
1038 | list: Vec<rustc_middle::ty::ParamTy>, | |
1b1a35ee | 1039 | next_ty_placeholder: usize, |
923072b8 FG |
1040 | pub(crate) params: rustc_data_structures::fx::FxHashMap<usize, rustc_middle::ty::ParamTy>, |
1041 | pub(crate) named_regions: BTreeMap<DefId, u32>, | |
f9f354fc XL |
1042 | } |
1043 | ||
1044 | impl<'tcx> ParamsSubstitutor<'tcx> { | |
923072b8 | 1045 | pub(crate) fn new(tcx: TyCtxt<'tcx>, next_ty_placeholder: usize) -> Self { |
f9f354fc XL |
1046 | ParamsSubstitutor { |
1047 | tcx, | |
1048 | binder_index: ty::INNERMOST, | |
1049 | list: vec![], | |
1b1a35ee | 1050 | next_ty_placeholder, |
f9f354fc XL |
1051 | params: rustc_data_structures::fx::FxHashMap::default(), |
1052 | named_regions: BTreeMap::default(), | |
1053 | } | |
1054 | } | |
1055 | } | |
1056 | ||
1057 | impl<'tcx> TypeFolder<'tcx> for ParamsSubstitutor<'tcx> { | |
1058 | fn tcx<'b>(&'b self) -> TyCtxt<'tcx> { | |
1059 | self.tcx | |
1060 | } | |
1061 | ||
cdc7bbd5 | 1062 | fn fold_binder<T: TypeFoldable<'tcx>>(&mut self, t: Binder<'tcx, T>) -> Binder<'tcx, T> { |
f9f354fc XL |
1063 | self.binder_index.shift_in(1); |
1064 | let result = t.super_fold_with(self); | |
1065 | self.binder_index.shift_out(1); | |
1066 | result | |
1067 | } | |
1068 | ||
1069 | fn fold_ty(&mut self, t: Ty<'tcx>) -> Ty<'tcx> { | |
1b1a35ee | 1070 | match *t.kind() { |
f9f354fc | 1071 | ty::Param(param) => match self.list.iter().position(|r| r == ¶m) { |
1b1a35ee | 1072 | Some(idx) => self.tcx.mk_ty(ty::Placeholder(ty::PlaceholderType { |
f9f354fc | 1073 | universe: ty::UniverseIndex::from_usize(0), |
1b1a35ee | 1074 | name: ty::BoundVar::from_usize(idx), |
f9f354fc XL |
1075 | })), |
1076 | None => { | |
1077 | self.list.push(param); | |
1b1a35ee | 1078 | let idx = self.list.len() - 1 + self.next_ty_placeholder; |
f9f354fc XL |
1079 | self.params.insert(idx, param); |
1080 | self.tcx.mk_ty(ty::Placeholder(ty::PlaceholderType { | |
1081 | universe: ty::UniverseIndex::from_usize(0), | |
1082 | name: ty::BoundVar::from_usize(idx), | |
1083 | })) | |
1084 | } | |
1085 | }, | |
f9f354fc XL |
1086 | _ => t.super_fold_with(self), |
1087 | } | |
1088 | } | |
1089 | ||
1090 | fn fold_region(&mut self, r: Region<'tcx>) -> Region<'tcx> { | |
5099ac24 FG |
1091 | match *r { |
1092 | // FIXME(chalk) - jackh726 - this currently isn't hit in any tests, | |
1093 | // since canonicalization will already change these to canonical | |
1094 | // variables (ty::ReLateBound). | |
f9f354fc | 1095 | ty::ReEarlyBound(_re) => match self.named_regions.get(&_re.def_id) { |
fc512014 | 1096 | Some(idx) => { |
cdc7bbd5 XL |
1097 | let br = ty::BoundRegion { |
1098 | var: ty::BoundVar::from_u32(*idx), | |
487cf647 | 1099 | kind: ty::BrAnon(*idx, None), |
cdc7bbd5 | 1100 | }; |
5099ac24 | 1101 | self.tcx.mk_region(ty::ReLateBound(self.binder_index, br)) |
fc512014 | 1102 | } |
f9f354fc XL |
1103 | None => { |
1104 | let idx = self.named_regions.len() as u32; | |
487cf647 FG |
1105 | let br = ty::BoundRegion { |
1106 | var: ty::BoundVar::from_u32(idx), | |
1107 | kind: ty::BrAnon(idx, None), | |
1108 | }; | |
f9f354fc | 1109 | self.named_regions.insert(_re.def_id, idx); |
5099ac24 | 1110 | self.tcx.mk_region(ty::ReLateBound(self.binder_index, br)) |
f9f354fc XL |
1111 | } |
1112 | }, | |
1113 | ||
1114 | _ => r.super_fold_with(self), | |
1115 | } | |
1116 | } | |
1117 | } | |
1b1a35ee | 1118 | |
923072b8 | 1119 | pub(crate) struct ReverseParamsSubstitutor<'tcx> { |
5099ac24 FG |
1120 | tcx: TyCtxt<'tcx>, |
1121 | params: rustc_data_structures::fx::FxHashMap<usize, rustc_middle::ty::ParamTy>, | |
1122 | } | |
1123 | ||
1124 | impl<'tcx> ReverseParamsSubstitutor<'tcx> { | |
923072b8 | 1125 | pub(crate) fn new( |
5099ac24 FG |
1126 | tcx: TyCtxt<'tcx>, |
1127 | params: rustc_data_structures::fx::FxHashMap<usize, rustc_middle::ty::ParamTy>, | |
1128 | ) -> Self { | |
1129 | Self { tcx, params } | |
1130 | } | |
1131 | } | |
1132 | ||
1133 | impl<'tcx> TypeFolder<'tcx> for ReverseParamsSubstitutor<'tcx> { | |
1134 | fn tcx<'b>(&'b self) -> TyCtxt<'tcx> { | |
1135 | self.tcx | |
1136 | } | |
1137 | ||
1138 | fn fold_ty(&mut self, t: Ty<'tcx>) -> Ty<'tcx> { | |
1139 | match *t.kind() { | |
1140 | ty::Placeholder(ty::PlaceholderType { universe: ty::UniverseIndex::ROOT, name }) => { | |
1141 | match self.params.get(&name.as_usize()) { | |
1142 | Some(param) => self.tcx.mk_ty(ty::Param(*param)), | |
1143 | None => t, | |
1144 | } | |
1145 | } | |
1146 | ||
1147 | _ => t.super_fold_with(self), | |
1148 | } | |
1149 | } | |
1150 | } | |
1151 | ||
1b1a35ee | 1152 | /// Used to collect `Placeholder`s. |
923072b8 | 1153 | pub(crate) struct PlaceholdersCollector { |
1b1a35ee | 1154 | universe_index: ty::UniverseIndex, |
923072b8 FG |
1155 | pub(crate) next_ty_placeholder: usize, |
1156 | pub(crate) next_anon_region_placeholder: u32, | |
1b1a35ee XL |
1157 | } |
1158 | ||
1159 | impl PlaceholdersCollector { | |
923072b8 | 1160 | pub(crate) fn new() -> Self { |
1b1a35ee XL |
1161 | PlaceholdersCollector { |
1162 | universe_index: ty::UniverseIndex::ROOT, | |
1163 | next_ty_placeholder: 0, | |
1164 | next_anon_region_placeholder: 0, | |
1165 | } | |
1166 | } | |
1167 | } | |
1168 | ||
1169 | impl<'tcx> TypeVisitor<'tcx> for PlaceholdersCollector { | |
fc512014 | 1170 | fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> { |
1b1a35ee XL |
1171 | match t.kind() { |
1172 | ty::Placeholder(p) if p.universe == self.universe_index => { | |
1173 | self.next_ty_placeholder = self.next_ty_placeholder.max(p.name.as_usize() + 1); | |
1174 | } | |
1175 | ||
1176 | _ => (), | |
1177 | }; | |
1178 | ||
1179 | t.super_visit_with(self) | |
1180 | } | |
1181 | ||
fc512014 | 1182 | fn visit_region(&mut self, r: Region<'tcx>) -> ControlFlow<Self::BreakTy> { |
5099ac24 | 1183 | match *r { |
1b1a35ee | 1184 | ty::RePlaceholder(p) if p.universe == self.universe_index => { |
487cf647 | 1185 | if let ty::BoundRegionKind::BrAnon(anon, _) = p.name { |
1b1a35ee XL |
1186 | self.next_anon_region_placeholder = self.next_anon_region_placeholder.max(anon); |
1187 | } | |
1188 | } | |
1189 | ||
1190 | _ => (), | |
1191 | }; | |
1192 | ||
1193 | r.super_visit_with(self) | |
1194 | } | |
1195 | } |