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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:11:38 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:12:43 +0000 |
commit | cf94bdc0742c13e2a0cac864c478b8626b266e1b (patch) | |
tree | 044670aa50cc5e2b4229aa0b6b3df6676730c0a6 /compiler/rustc_infer/src/infer/opaque_types.rs | |
parent | Adding debian version 1.65.0+dfsg1-2. (diff) | |
download | rustc-cf94bdc0742c13e2a0cac864c478b8626b266e1b.tar.xz rustc-cf94bdc0742c13e2a0cac864c478b8626b266e1b.zip |
Merging upstream version 1.66.0+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'compiler/rustc_infer/src/infer/opaque_types.rs')
-rw-r--r-- | compiler/rustc_infer/src/infer/opaque_types.rs | 53 |
1 files changed, 29 insertions, 24 deletions
diff --git a/compiler/rustc_infer/src/infer/opaque_types.rs b/compiler/rustc_infer/src/infer/opaque_types.rs index 8c9ddf866..a982f11f7 100644 --- a/compiler/rustc_infer/src/infer/opaque_types.rs +++ b/compiler/rustc_infer/src/infer/opaque_types.rs @@ -1,14 +1,16 @@ use crate::errors::OpaqueHiddenTypeDiag; use crate::infer::{DefiningAnchor, InferCtxt, InferOk}; use crate::traits; +use hir::def::DefKind; use hir::def_id::{DefId, LocalDefId}; use hir::{HirId, OpaqueTyOrigin}; use rustc_data_structures::sync::Lrc; use rustc_data_structures::vec_map::VecMap; use rustc_hir as hir; use rustc_middle::traits::ObligationCause; +use rustc_middle::ty::error::{ExpectedFound, TypeError}; use rustc_middle::ty::fold::BottomUpFolder; -use rustc_middle::ty::subst::{GenericArgKind, Subst}; +use rustc_middle::ty::GenericArgKind; use rustc_middle::ty::{ self, OpaqueHiddenType, OpaqueTypeKey, Ty, TyCtxt, TypeFoldable, TypeSuperVisitable, TypeVisitable, TypeVisitor, @@ -40,7 +42,7 @@ pub struct OpaqueTypeDecl<'tcx> { pub origin: hir::OpaqueTyOrigin, } -impl<'a, 'tcx> InferCtxt<'a, 'tcx> { +impl<'tcx> InferCtxt<'tcx> { /// This is a backwards compatibility hack to prevent breaking changes from /// lazy TAIT around RPIT handling. pub fn replace_opaque_types_with_inference_vars<T: TypeFoldable<'tcx>>( @@ -101,7 +103,7 @@ impl<'a, 'tcx> InferCtxt<'a, '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 { @@ -167,25 +169,18 @@ impl<'a, 'tcx> InferCtxt<'a, '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 { - // Rerun equality check, but this time error out due to - // different types. - match self.at(cause, param_env).define_opaque_types(false).eq(a, b) { - Ok(_) => span_bug!( - cause.span, - "opaque types are never equal to anything but themselves: {:#?}", - (a.kind(), b.kind()) - ), - Err(e) => Err(e), - } + let (a, b) = self.resolve_vars_if_possible((a, b)); + Err(TypeError::Sorts(ExpectedFound::new(true, a, b))) } } @@ -518,15 +513,16 @@ impl UseKind { } } -impl<'a, 'tcx> InferCtxt<'a, 'tcx> { +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; @@ -545,21 +541,24 @@ impl<'a, 'tcx> InferCtxt<'a, '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()); - for predicate in item_bounds.transpose_iter().map(|e| e.map_bound(|(p, _)| *p)) { - debug!(?predicate); - let predicate = predicate.subst(tcx, substs); - + for (predicate, _) in item_bounds.subst_iter_copied(tcx, substs) { let predicate = predicate.fold_with(&mut BottomUpFolder { tcx, ty_op: |ty| match *ty.kind() { // We can't normalize associated types from `rustc_infer`, // but we can eagerly register inference variables for them. - ty::Projection(projection_ty) if !projection_ty.has_escaping_bound_vars() => { + // FIXME(RPITIT): Don't replace RPITITs with inference vars. + ty::Projection(projection_ty) + if !projection_ty.has_escaping_bound_vars() + && tcx.def_kind(projection_ty.item_def_id) + != DefKind::ImplTraitPlaceholder => + { self.infer_projection( param_env, projection_ty, @@ -575,6 +574,12 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> { { hidden_ty } + // FIXME(RPITIT): This can go away when we move to associated types + ty::Projection(proj) + if def_id.to_def_id() == proj.item_def_id && substs == proj.substs => + { + hidden_ty + } _ => ty, }, lt_op: |lt| lt, @@ -623,7 +628,7 @@ fn may_define_opaque_type(tcx: TyCtxt<'_>, def_id: LocalDefId, opaque_hir_id: hi let scope = tcx.hir().get_defining_scope(opaque_hir_id); // We walk up the node tree until we hit the root or the scope of the opaque type. while hir_id != scope && hir_id != hir::CRATE_HIR_ID { - hir_id = tcx.hir().local_def_id_to_hir_id(tcx.hir().get_parent_item(hir_id)); + hir_id = tcx.hir().get_parent_item(hir_id).into(); } // Syntactically, we are allowed to define the concrete type if: let res = hir_id == scope; |