diff options
Diffstat (limited to 'compiler/rustc_infer/src')
| -rw-r--r-- | compiler/rustc_infer/src/infer/canonical/query_response.rs | 16 | ||||
| -rw-r--r-- | compiler/rustc_infer/src/infer/nll_relate/mod.rs | 15 | ||||
| -rw-r--r-- | compiler/rustc_infer/src/infer/opaque_types.rs | 13 | ||||
| -rw-r--r-- | compiler/rustc_infer/src/infer/sub.rs | 39 |
4 files changed, 31 insertions, 52 deletions
diff --git a/compiler/rustc_infer/src/infer/canonical/query_response.rs b/compiler/rustc_infer/src/infer/canonical/query_response.rs index 608b5cc8756..4d287988e33 100644 --- a/compiler/rustc_infer/src/infer/canonical/query_response.rs +++ b/compiler/rustc_infer/src/infer/canonical/query_response.rs @@ -16,8 +16,8 @@ use crate::infer::nll_relate::{NormalizationStrategy, TypeRelating, TypeRelating use crate::infer::region_constraints::{Constraint, RegionConstraintData}; use crate::infer::{InferCtxt, InferOk, InferResult, NllRegionVariableOrigin}; use crate::traits::query::{Fallible, NoSolution}; -use crate::traits::TraitEngine; use crate::traits::{Obligation, ObligationCause, PredicateObligation}; +use crate::traits::{PredicateObligations, TraitEngine}; use rustc_data_structures::captures::Captures; use rustc_index::vec::Idx; use rustc_index::vec::IndexVec; @@ -509,7 +509,7 @@ impl<'tcx> InferCtxt<'tcx> { for &(a, b) in &query_response.value.opaque_types { let a = substitute_value(self.tcx, &result_subst, a); let b = substitute_value(self.tcx, &result_subst, b); - obligations.extend(self.handle_opaque_type(a, b, true, cause, param_env)?.obligations); + obligations.extend(self.at(cause, param_env).eq(a, b)?.obligations); } Ok(InferOk { value: result_subst, obligations }) @@ -741,17 +741,11 @@ impl<'tcx> TypeRelatingDelegate<'tcx> for QueryTypeRelatingDelegate<'_, 'tcx> { true } - fn register_opaque_type( + fn register_opaque_type_obligations( &mut self, - a: Ty<'tcx>, - b: Ty<'tcx>, - a_is_expected: bool, + obligations: PredicateObligations<'tcx>, ) -> Result<(), TypeError<'tcx>> { - self.obligations.extend( - self.infcx - .handle_opaque_type(a, b, a_is_expected, &self.cause, self.param_env)? - .obligations, - ); + self.obligations.extend(obligations); Ok(()) } } diff --git a/compiler/rustc_infer/src/infer/nll_relate/mod.rs b/compiler/rustc_infer/src/infer/nll_relate/mod.rs index bd4a1155092..600f94f095e 100644 --- a/compiler/rustc_infer/src/infer/nll_relate/mod.rs +++ b/compiler/rustc_infer/src/infer/nll_relate/mod.rs @@ -25,7 +25,9 @@ use crate::infer::combine::ConstEquateRelation; use crate::infer::InferCtxt; use crate::infer::{ConstVarValue, ConstVariableValue}; use crate::infer::{TypeVariableOrigin, TypeVariableOriginKind}; +use crate::traits::PredicateObligation; use rustc_data_structures::fx::FxHashMap; +use rustc_middle::traits::ObligationCause; use rustc_middle::ty::error::TypeError; use rustc_middle::ty::relate::{self, Relate, RelateResult, TypeRelation}; use rustc_middle::ty::visit::{TypeSuperVisitable, TypeVisitable, TypeVisitor}; @@ -91,11 +93,9 @@ pub trait TypeRelatingDelegate<'tcx> { ); fn const_equate(&mut self, a: ty::Const<'tcx>, b: ty::Const<'tcx>); - fn register_opaque_type( + fn register_opaque_type_obligations( &mut self, - a: Ty<'tcx>, - b: Ty<'tcx>, - a_is_expected: bool, + obligations: Vec<PredicateObligation<'tcx>>, ) -> Result<(), TypeError<'tcx>>; /// Creates a new universe index. Used when instantiating placeholders. @@ -414,7 +414,12 @@ where (_, &ty::Opaque(..)) => (generalize(a, true)?, b), _ => unreachable!(), }; - self.delegate.register_opaque_type(a, b, true)?; + let cause = ObligationCause::dummy_with_span(self.delegate.span()); + let obligations = self + .infcx + .handle_opaque_type(a, b, true, &cause, self.delegate.param_env())? + .obligations; + self.delegate.register_opaque_type_obligations(obligations)?; trace!(a = ?a.kind(), b = ?b.kind(), "opaque type instantiated"); Ok(a) } diff --git a/compiler/rustc_infer/src/infer/opaque_types.rs b/compiler/rustc_infer/src/infer/opaque_types.rs index 0a4ecc4c033..a982f11f718 100644 --- a/compiler/rustc_infer/src/infer/opaque_types.rs +++ b/compiler/rustc_infer/src/infer/opaque_types.rs @@ -103,7 +103,7 @@ impl<'tcx> InferCtxt<'tcx> { return Ok(InferOk { value: (), obligations: vec![] }); } let (a, b) = if a_is_expected { (a, b) } else { (b, a) }; - let process = |a: Ty<'tcx>, b: Ty<'tcx>| match *a.kind() { + let process = |a: Ty<'tcx>, b: Ty<'tcx>, a_is_expected| match *a.kind() { ty::Opaque(def_id, substs) if def_id.is_local() => { let def_id = def_id.expect_local(); let origin = match self.defining_use_anchor { @@ -169,13 +169,14 @@ impl<'tcx> InferCtxt<'tcx> { param_env, b, origin, + a_is_expected, )) } _ => None, }; - if let Some(res) = process(a, b) { + if let Some(res) = process(a, b, true) { res - } else if let Some(res) = process(b, a) { + } else if let Some(res) = process(b, a, false) { res } else { let (a, b) = self.resolve_vars_if_possible((a, b)); @@ -514,13 +515,14 @@ impl UseKind { impl<'tcx> InferCtxt<'tcx> { #[instrument(skip(self), level = "debug")] - pub fn register_hidden_type( + fn register_hidden_type( &self, opaque_type_key: OpaqueTypeKey<'tcx>, cause: ObligationCause<'tcx>, param_env: ty::ParamEnv<'tcx>, hidden_ty: Ty<'tcx>, origin: hir::OpaqueTyOrigin, + a_is_expected: bool, ) -> InferResult<'tcx, ()> { let tcx = self.tcx; let OpaqueTypeKey { def_id, substs } = opaque_type_key; @@ -539,7 +541,8 @@ impl<'tcx> InferCtxt<'tcx> { origin, ); if let Some(prev) = prev { - obligations = self.at(&cause, param_env).eq(prev, hidden_ty)?.obligations; + obligations = + self.at(&cause, param_env).eq_exp(a_is_expected, prev, hidden_ty)?.obligations; } let item_bounds = tcx.bound_explicit_item_bounds(def_id.to_def_id()); diff --git a/compiler/rustc_infer/src/infer/sub.rs b/compiler/rustc_infer/src/infer/sub.rs index a4b55dfa691..97354ba5d1b 100644 --- a/compiler/rustc_infer/src/infer/sub.rs +++ b/compiler/rustc_infer/src/infer/sub.rs @@ -2,9 +2,7 @@ use super::combine::{CombineFields, RelationDir}; use super::SubregionOrigin; use crate::infer::combine::ConstEquateRelation; -use crate::infer::{TypeVariableOrigin, TypeVariableOriginKind}; use crate::traits::Obligation; -use rustc_middle::ty::error::{ExpectedFound, TypeError}; use rustc_middle::ty::relate::{Cause, Relate, RelateResult, TypeRelation}; use rustc_middle::ty::visit::TypeVisitable; use rustc_middle::ty::TyVar; @@ -130,39 +128,18 @@ impl<'tcx> TypeRelation<'tcx> for Sub<'_, '_, 'tcx> { (&ty::Opaque(did, ..), _) | (_, &ty::Opaque(did, ..)) if self.fields.define_opaque_types && did.is_local() => { - let mut generalize = |ty, ty_is_expected| { - let var = infcx.next_ty_var_id_in_universe( - TypeVariableOrigin { - kind: TypeVariableOriginKind::MiscVariable, - span: self.fields.trace.cause.span, - }, - ty::UniverseIndex::ROOT, - ); - self.fields.instantiate(ty, RelationDir::SubtypeOf, var, ty_is_expected)?; - Ok(infcx.tcx.mk_ty_var(var)) - }; - let (a, b) = if self.a_is_expected { (a, b) } else { (b, a) }; - let (ga, gb) = match (a.kind(), b.kind()) { - (&ty::Opaque(..), _) => (a, generalize(b, true)?), - (_, &ty::Opaque(..)) => (generalize(a, false)?, b), - _ => unreachable!(), - }; self.fields.obligations.extend( infcx - .handle_opaque_type(ga, gb, true, &self.fields.trace.cause, self.param_env()) - // Don't leak any generalized type variables out of this - // subtyping relation in the case of a type error. - .map_err(|err| { - let (ga, gb) = self.fields.infcx.resolve_vars_if_possible((ga, gb)); - if let TypeError::Sorts(sorts) = err && sorts.expected == ga && sorts.found == gb { - TypeError::Sorts(ExpectedFound { expected: a, found: b }) - } else { - err - } - })? + .handle_opaque_type( + a, + b, + self.a_is_expected, + &self.fields.trace.cause, + self.param_env(), + )? .obligations, ); - Ok(ga) + Ok(a) } // Optimization of GeneratorWitness relation since we know that all // free regions are replaced with bound regions during construction. |