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Rollup merge of #131183 - compiler-errors:opaque-ty-origin, r=estebank

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Refactoring to `OpaqueTyOrigin`

Pulled out of a larger PR that uses these changes to do cross-crate encoding of opaque origin, so we can use them for edition 2024 migrations. These changes should be self-explanatory on their own, tho 😄
This commit is contained in:
Matthias Krüger 2024-10-03 21:52:46 +02:00 committed by GitHub
commit da81f64d84
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GPG Key ID: B5690EEEBB952194
34 changed files with 223 additions and 163 deletions
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2
compiler/rustc_ast_lowering/src/item.rs
View File

@ -286,7 +286,6 @@ impl<'hir> LoweringContext<'_, 'hir> {
parent: this.local_def_id(id),
in_assoc_ty: false,
},
fn_kind: None,
}),
},
);
@ -983,7 +982,6 @@ impl<'hir> LoweringContext<'_, 'hir> {
parent: this.local_def_id(i.id),
in_assoc_ty: true,
},
fn_kind: None,
});
hir::ImplItemKind::Type(ty)
}

87
compiler/rustc_ast_lowering/src/lib.rs
View File

@ -288,12 +288,7 @@ enum ImplTraitContext {
/// Example: `fn foo() -> impl Debug`, where `impl Debug` is conceptually
/// equivalent to a new opaque type like `type T = impl Debug; fn foo() -> T`.
///
OpaqueTy {
origin: hir::OpaqueTyOrigin,
/// Only used to change the lifetime capture rules, since
/// RPITIT captures all in scope, RPIT does not.
fn_kind: Option<FnDeclKind>,
},
OpaqueTy { origin: hir::OpaqueTyOrigin },
/// `impl Trait` is unstably accepted in this position.
FeatureGated(ImplTraitPosition, Symbol),
/// `impl Trait` is not accepted in this position.
@ -1404,14 +1399,9 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
TyKind::ImplTrait(def_node_id, bounds) => {
let span = t.span;
match itctx {
ImplTraitContext::OpaqueTy { origin, fn_kind } => self.lower_opaque_impl_trait(
span,
origin,
*def_node_id,
bounds,
fn_kind,
itctx,
),
ImplTraitContext::OpaqueTy { origin } => {
self.lower_opaque_impl_trait(span, origin, *def_node_id, bounds, itctx)
}
ImplTraitContext::Universal => {
if let Some(span) = bounds.iter().find_map(|bound| match *bound {
ast::GenericBound::Use(_, span) => Some(span),
@ -1513,7 +1503,6 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
origin: hir::OpaqueTyOrigin,
opaque_ty_node_id: NodeId,
bounds: &GenericBounds,
fn_kind: Option<FnDeclKind>,
itctx: ImplTraitContext,
) -> hir::TyKind<'hir> {
// Make sure we know that some funky desugaring has been going on here.
@ -1555,11 +1544,9 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
.map(|(ident, id, _)| Lifetime { id, ident })
.collect()
}
hir::OpaqueTyOrigin::FnReturn(..) => {
if matches!(
fn_kind.expect("expected RPITs to be lowered with a FnKind"),
FnDeclKind::Impl | FnDeclKind::Trait
) || self.tcx.features().lifetime_capture_rules_2024
hir::OpaqueTyOrigin::FnReturn { in_trait_or_impl, .. } => {
if in_trait_or_impl.is_some()
|| self.tcx.features().lifetime_capture_rules_2024
|| span.at_least_rust_2024()
{
// return-position impl trait in trait was decided to capture all
@ -1576,16 +1563,16 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
lifetime_collector::lifetimes_in_bounds(self.resolver, bounds)
}
}
hir::OpaqueTyOrigin::AsyncFn(..) => {
hir::OpaqueTyOrigin::AsyncFn { .. } => {
unreachable!("should be using `lower_async_fn_ret_ty`")
}
}
};
debug!(?captured_lifetimes_to_duplicate);
match fn_kind {
// Deny `use<>` on RPITIT in trait/trait-impl for now.
Some(FnDeclKind::Trait | FnDeclKind::Impl) => {
// Feature gate for RPITIT + use<..>
match origin {
rustc_hir::OpaqueTyOrigin::FnReturn { in_trait_or_impl: Some(_), .. } => {
if let Some(span) = bounds.iter().find_map(|bound| match *bound {
ast::GenericBound::Use(_, span) => Some(span),
_ => None,
@ -1593,20 +1580,12 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
self.tcx.dcx().emit_err(errors::NoPreciseCapturesOnRpitit { span });
}
}
None
| Some(
FnDeclKind::Fn
| FnDeclKind::Inherent
| FnDeclKind::ExternFn
| FnDeclKind::Closure
| FnDeclKind::Pointer,
) => {}
_ => {}
}
self.lower_opaque_inner(
opaque_ty_node_id,
origin,
matches!(fn_kind, Some(FnDeclKind::Trait)),
captured_lifetimes_to_duplicate,
span,
opaque_ty_span,
@ -1618,7 +1597,6 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
&mut self,
opaque_ty_node_id: NodeId,
origin: hir::OpaqueTyOrigin,
in_trait: bool,
captured_lifetimes_to_duplicate: FxIndexSet<Lifetime>,
span: Span,
opaque_ty_span: Span,
@ -1747,7 +1725,6 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
bounds,
origin,
lifetime_mapping,
in_trait,
};
// Generate an `type Foo = impl Trait;` declaration.
@ -1776,7 +1753,6 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
hir::TyKind::OpaqueDef(
hir::ItemId { owner_id: hir::OwnerId { def_id: opaque_ty_def_id } },
generic_args,
in_trait,
)
}
@ -1864,12 +1840,23 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
None => match &decl.output {
FnRetTy::Ty(ty) => {
let itctx = match kind {
FnDeclKind::Fn
| FnDeclKind::Inherent
| FnDeclKind::Trait
| FnDeclKind::Impl => ImplTraitContext::OpaqueTy {
origin: hir::OpaqueTyOrigin::FnReturn(self.local_def_id(fn_node_id)),
fn_kind: Some(kind),
FnDeclKind::Fn | FnDeclKind::Inherent => ImplTraitContext::OpaqueTy {
origin: hir::OpaqueTyOrigin::FnReturn {
parent: self.local_def_id(fn_node_id),
in_trait_or_impl: None,
},
},
FnDeclKind::Trait => ImplTraitContext::OpaqueTy {
origin: hir::OpaqueTyOrigin::FnReturn {
parent: self.local_def_id(fn_node_id),
in_trait_or_impl: Some(hir::RpitContext::Trait),
},
},
FnDeclKind::Impl => ImplTraitContext::OpaqueTy {
origin: hir::OpaqueTyOrigin::FnReturn {
parent: self.local_def_id(fn_node_id),
in_trait_or_impl: Some(hir::RpitContext::TraitImpl),
},
},
FnDeclKind::ExternFn => {
ImplTraitContext::Disallowed(ImplTraitPosition::ExternFnReturn)
@ -1951,10 +1938,16 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
.map(|(ident, id, _)| Lifetime { id, ident })
.collect();
let in_trait_or_impl = match fn_kind {
FnDeclKind::Trait => Some(hir::RpitContext::Trait),
FnDeclKind::Impl => Some(hir::RpitContext::TraitImpl),
FnDeclKind::Fn | FnDeclKind::Inherent => None,
FnDeclKind::ExternFn | FnDeclKind::Closure | FnDeclKind::Pointer => unreachable!(),
};
let opaque_ty_ref = self.lower_opaque_inner(
opaque_ty_node_id,
hir::OpaqueTyOrigin::AsyncFn(fn_def_id),
matches!(fn_kind, FnDeclKind::Trait),
hir::OpaqueTyOrigin::AsyncFn { parent: fn_def_id, in_trait_or_impl },
captured_lifetimes,
span,
opaque_ty_span,
@ -1964,8 +1957,10 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
coro,
opaque_ty_span,
ImplTraitContext::OpaqueTy {
origin: hir::OpaqueTyOrigin::FnReturn(fn_def_id),
fn_kind: Some(fn_kind),
origin: hir::OpaqueTyOrigin::FnReturn {
parent: fn_def_id,
in_trait_or_impl,
},
},
);
arena_vec![this; bound]

2
compiler/rustc_borrowck/src/diagnostics/region_name.rs
View File

@ -832,7 +832,7 @@ impl<'tcx> MirBorrowckCtxt<'_, '_, 'tcx> {
fn get_future_inner_return_ty(&self, hir_ty: &'tcx hir::Ty<'tcx>) -> &'tcx hir::Ty<'tcx> {
let hir = self.infcx.tcx.hir();
let hir::TyKind::OpaqueDef(id, _, _) = hir_ty.kind else {
let hir::TyKind::OpaqueDef(id, _) = hir_ty.kind else {
span_bug!(
hir_ty.span,
"lowered return type of async fn is not OpaqueDef: {:?}",

4
compiler/rustc_borrowck/src/region_infer/opaque_types.rs
View File

@ -503,8 +503,8 @@ impl<'tcx> LazyOpaqueTyEnv<'tcx> {
let &Self { tcx, def_id, .. } = self;
let origin = tcx.opaque_type_origin(def_id);
let parent = match origin {
hir::OpaqueTyOrigin::FnReturn(parent)
| hir::OpaqueTyOrigin::AsyncFn(parent)
hir::OpaqueTyOrigin::FnReturn { parent, .. }
| hir::OpaqueTyOrigin::AsyncFn { parent, .. }
| hir::OpaqueTyOrigin::TyAlias { parent, .. } => parent,
};
let param_env = tcx.param_env(parent);

28
compiler/rustc_hir/src/hir.rs
View File

@ -2632,7 +2632,7 @@ impl<'hir> Ty<'hir> {
}
TyKind::Tup(tys) => tys.iter().any(Self::is_suggestable_infer_ty),
TyKind::Ptr(mut_ty) | TyKind::Ref(_, mut_ty) => mut_ty.ty.is_suggestable_infer_ty(),
TyKind::OpaqueDef(_, generic_args, _) => are_suggestable_generic_args(generic_args),
TyKind::OpaqueDef(_, generic_args) => are_suggestable_generic_args(generic_args),
TyKind::Path(QPath::TypeRelative(ty, segment)) => {
ty.is_suggestable_infer_ty() || are_suggestable_generic_args(segment.args().args)
}
@ -2762,10 +2762,6 @@ pub struct OpaqueTy<'hir> {
/// This mapping associated a captured lifetime (first parameter) with the new
/// early-bound lifetime that was generated for the opaque.
pub lifetime_mapping: &'hir [(&'hir Lifetime, LocalDefId)],
/// Whether the opaque is a return-position impl trait (or async future)
/// originating from a trait method. This makes it so that the opaque is
/// lowered as an associated type.
pub in_trait: bool,
}
#[derive(Debug, Clone, Copy, HashStable_Generic)]
@ -2802,13 +2798,29 @@ pub struct PreciseCapturingNonLifetimeArg {
pub res: Res,
}
#[derive(Copy, Clone, PartialEq, Eq, Debug, HashStable_Generic)]
pub enum RpitContext {
Trait,
TraitImpl,
}
/// From whence the opaque type came.
#[derive(Copy, Clone, PartialEq, Eq, Debug, HashStable_Generic)]
pub enum OpaqueTyOrigin {
/// `-> impl Trait`
FnReturn(LocalDefId),
FnReturn {
/// The defining function.
parent: LocalDefId,
// Whether this is an RPITIT (return position impl trait in trait)
in_trait_or_impl: Option<RpitContext>,
},
/// `async fn`
AsyncFn(LocalDefId),
AsyncFn {
/// The defining function.
parent: LocalDefId,
// Whether this is an AFIT (async fn in trait)
in_trait_or_impl: Option<RpitContext>,
},
/// type aliases: `type Foo = impl Trait;`
TyAlias {
/// The type alias or associated type parent of the TAIT/ATPIT
@ -2856,7 +2868,7 @@ pub enum TyKind<'hir> {
/// possibly parameters) that are actually bound on the `impl Trait`.
///
/// The last parameter specifies whether this opaque appears in a trait definition.
OpaqueDef(ItemId, &'hir [GenericArg<'hir>], bool),
OpaqueDef(ItemId, &'hir [GenericArg<'hir>]),
/// A trait object type `Bound1 + Bound2 + Bound3`
/// where `Bound` is a trait or a lifetime.
TraitObject(

2
compiler/rustc_hir/src/intravisit.rs
View File

@ -894,7 +894,7 @@ pub fn walk_ty<'v, V: Visitor<'v>>(visitor: &mut V, typ: &'v Ty<'v>) -> V::Resul
TyKind::Path(ref qpath) => {
try_visit!(visitor.visit_qpath(qpath, typ.hir_id, typ.span));
}
TyKind::OpaqueDef(item_id, lifetimes, _in_trait) => {
TyKind::OpaqueDef(item_id, lifetimes) => {
try_visit!(visitor.visit_nested_item(item_id));
walk_list!(visitor, visit_generic_arg, lifetimes);
}

16
compiler/rustc_hir_analysis/src/check/check.rs
View File

@ -336,9 +336,9 @@ fn check_opaque_meets_bounds<'tcx>(
origin: &hir::OpaqueTyOrigin,
) -> Result<(), ErrorGuaranteed> {
let defining_use_anchor = match *origin {
hir::OpaqueTyOrigin::FnReturn(did)
| hir::OpaqueTyOrigin::AsyncFn(did)
| hir::OpaqueTyOrigin::TyAlias { parent: did, .. } => did,
hir::OpaqueTyOrigin::FnReturn { parent, .. }
| hir::OpaqueTyOrigin::AsyncFn { parent, .. }
| hir::OpaqueTyOrigin::TyAlias { parent, .. } => parent,
};
let param_env = tcx.param_env(defining_use_anchor);
@ -346,8 +346,8 @@ fn check_opaque_meets_bounds<'tcx>(
let ocx = ObligationCtxt::new_with_diagnostics(&infcx);
let args = match *origin {
hir::OpaqueTyOrigin::FnReturn(parent)
| hir::OpaqueTyOrigin::AsyncFn(parent)
hir::OpaqueTyOrigin::FnReturn { parent, .. }
| hir::OpaqueTyOrigin::AsyncFn { parent, .. }
| hir::OpaqueTyOrigin::TyAlias { parent, .. } => GenericArgs::identity_for_item(
tcx, parent,
)
@ -409,7 +409,7 @@ fn check_opaque_meets_bounds<'tcx>(
let outlives_env = OutlivesEnvironment::with_bounds(param_env, implied_bounds);
ocx.resolve_regions_and_report_errors(defining_use_anchor, &outlives_env)?;
if let hir::OpaqueTyOrigin::FnReturn(..) | hir::OpaqueTyOrigin::AsyncFn(..) = origin {
if let hir::OpaqueTyOrigin::FnReturn { .. } | hir::OpaqueTyOrigin::AsyncFn { .. } = origin {
// HACK: this should also fall through to the hidden type check below, but the original
// implementation had a bug where equivalent lifetimes are not identical. This caused us
// to reject existing stable code that is otherwise completely fine. The real fix is to
@ -736,8 +736,8 @@ pub(crate) fn check_item_type(tcx: TyCtxt<'_>, def_id: LocalDefId) {
check_opaque_precise_captures(tcx, def_id);
let origin = tcx.opaque_type_origin(def_id);
if let hir::OpaqueTyOrigin::FnReturn(fn_def_id)
| hir::OpaqueTyOrigin::AsyncFn(fn_def_id) = origin
if let hir::OpaqueTyOrigin::FnReturn { parent: fn_def_id, .. }
| hir::OpaqueTyOrigin::AsyncFn { parent: fn_def_id, .. } = origin
&& let hir::Node::TraitItem(trait_item) = tcx.hir_node_by_def_id(fn_def_id)
&& let (_, hir::TraitFn::Required(..)) = trait_item.expect_fn()
{

4
compiler/rustc_hir_analysis/src/check/compare_impl_item/refine.rs
View File

@ -94,8 +94,8 @@ pub(super) fn check_refining_return_position_impl_trait_in_trait<'tcx>(
if !tcx.hir().get_if_local(impl_opaque.def_id).is_some_and(|node| {
matches!(
node.expect_item().expect_opaque_ty().origin,
hir::OpaqueTyOrigin::AsyncFn(def_id) | hir::OpaqueTyOrigin::FnReturn(def_id)
if def_id == impl_m.def_id.expect_local()
hir::OpaqueTyOrigin::AsyncFn { parent, .. } | hir::OpaqueTyOrigin::FnReturn { parent, .. }
if parent == impl_m.def_id.expect_local()
)
}) {
report_mismatched_rpitit_signature(

6
compiler/rustc_hir_analysis/src/collect/generics_of.rs
View File

@ -210,11 +210,11 @@ pub(super) fn generics_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::Generics {
Node::Item(item) => match item.kind {
ItemKind::OpaqueTy(&hir::OpaqueTy {
origin:
hir::OpaqueTyOrigin::FnReturn(fn_def_id) | hir::OpaqueTyOrigin::AsyncFn(fn_def_id),
in_trait,
hir::OpaqueTyOrigin::FnReturn { parent: fn_def_id, in_trait_or_impl }
| hir::OpaqueTyOrigin::AsyncFn { parent: fn_def_id, in_trait_or_impl },
..
}) => {
if in_trait {
if in_trait_or_impl.is_some() {
assert_matches!(tcx.def_kind(fn_def_id), DefKind::AssocFn);
} else {
assert_matches!(tcx.def_kind(fn_def_id), DefKind::AssocFn | DefKind::Fn);

70
compiler/rustc_hir_analysis/src/collect/item_bounds.rs
View File

@ -370,39 +370,47 @@ pub(super) fn explicit_item_bounds_with_filter(
..
}) => associated_type_bounds(tcx, def_id, bounds, *span, filter),
hir::Node::Item(hir::Item {
kind: hir::ItemKind::OpaqueTy(hir::OpaqueTy { bounds, in_trait: false, .. }),
kind: hir::ItemKind::OpaqueTy(hir::OpaqueTy { bounds, origin, .. }),
span,
..
}) => {
let args = GenericArgs::identity_for_item(tcx, def_id);
let item_ty = Ty::new_opaque(tcx, def_id.to_def_id(), args);
let bounds = opaque_type_bounds(tcx, def_id, bounds, item_ty, *span, filter);
assert_only_contains_predicates_from(filter, bounds, item_ty);
bounds
}
// Since RPITITs are lowered as projections in `<dyn HirTyLowerer>::lower_ty`, when we're
// asking for the item bounds of the *opaques* in a trait's default method signature, we
// need to map these projections back to opaques.
hir::Node::Item(hir::Item {
kind: hir::ItemKind::OpaqueTy(hir::OpaqueTy { bounds, in_trait: true, origin, .. }),
span,
..
}) => {
let (hir::OpaqueTyOrigin::FnReturn(fn_def_id)
| hir::OpaqueTyOrigin::AsyncFn(fn_def_id)) = *origin
else {
span_bug!(*span, "RPITIT cannot be a TAIT, but got origin {origin:?}");
};
let args = GenericArgs::identity_for_item(tcx, def_id);
let item_ty = Ty::new_opaque(tcx, def_id.to_def_id(), args);
let bounds = &*tcx.arena.alloc_slice(
&opaque_type_bounds(tcx, def_id, bounds, item_ty, *span, filter)
.to_vec()
.fold_with(&mut AssocTyToOpaque { tcx, fn_def_id: fn_def_id.to_def_id() }),
);
assert_only_contains_predicates_from(filter, bounds, item_ty);
bounds
}
}) => match origin {
// Since RPITITs are lowered as projections in `<dyn HirTyLowerer>::lower_ty`,
// when we're asking for the item bounds of the *opaques* in a trait's default
// method signature, we need to map these projections back to opaques.
rustc_hir::OpaqueTyOrigin::FnReturn {
parent,
in_trait_or_impl: Some(hir::RpitContext::Trait),
}
| rustc_hir::OpaqueTyOrigin::AsyncFn {
parent,
in_trait_or_impl: Some(hir::RpitContext::Trait),
} => {
let args = GenericArgs::identity_for_item(tcx, def_id);
let item_ty = Ty::new_opaque(tcx, def_id.to_def_id(), args);
let bounds = &*tcx.arena.alloc_slice(
&opaque_type_bounds(tcx, def_id, bounds, item_ty, *span, filter)
.to_vec()
.fold_with(&mut AssocTyToOpaque { tcx, fn_def_id: parent.to_def_id() }),
);
assert_only_contains_predicates_from(filter, bounds, item_ty);
bounds
}
rustc_hir::OpaqueTyOrigin::FnReturn {
parent: _,
in_trait_or_impl: None | Some(hir::RpitContext::TraitImpl),
}
| rustc_hir::OpaqueTyOrigin::AsyncFn {
parent: _,
in_trait_or_impl: None | Some(hir::RpitContext::TraitImpl),
}
| rustc_hir::OpaqueTyOrigin::TyAlias { parent: _, .. } => {
let args = GenericArgs::identity_for_item(tcx, def_id);
let item_ty = Ty::new_opaque(tcx, def_id.to_def_id(), args);
let bounds = opaque_type_bounds(tcx, def_id, bounds, item_ty, *span, filter);
assert_only_contains_predicates_from(filter, bounds, item_ty);
bounds
}
},
hir::Node::Item(hir::Item { kind: hir::ItemKind::TyAlias(..), .. }) => &[],
_ => bug!("item_bounds called on {:?}", def_id),
};

2
compiler/rustc_hir_analysis/src/collect/predicates_of.rs
View File

@ -332,7 +332,7 @@ fn gather_explicit_predicates_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::Gen
// and the duplicated parameter, to ensure that they do not get out of sync.
if let Node::Item(&Item { kind: ItemKind::OpaqueTy(..), .. }) = node {
let opaque_ty_node = tcx.parent_hir_node(hir_id);
let Node::Ty(&hir::Ty { kind: TyKind::OpaqueDef(_, lifetimes, _), .. }) = opaque_ty_node
let Node::Ty(&hir::Ty { kind: TyKind::OpaqueDef(_, lifetimes), .. }) = opaque_ty_node
else {
bug!("unexpected {opaque_ty_node:?}")
};

6
compiler/rustc_hir_analysis/src/collect/resolve_bound_vars.rs
View File

@ -515,8 +515,8 @@ impl<'a, 'tcx> Visitor<'tcx> for BoundVarContext<'a, 'tcx> {
}
hir::ItemKind::OpaqueTy(&hir::OpaqueTy {
origin:
hir::OpaqueTyOrigin::FnReturn(parent)
| hir::OpaqueTyOrigin::AsyncFn(parent)
hir::OpaqueTyOrigin::FnReturn { parent, .. }
| hir::OpaqueTyOrigin::AsyncFn { parent, .. }
| hir::OpaqueTyOrigin::TyAlias { parent, .. },
generics,
..
@ -689,7 +689,7 @@ impl<'a, 'tcx> Visitor<'tcx> for BoundVarContext<'a, 'tcx> {
};
self.with(scope, |this| this.visit_ty(mt.ty));
}
hir::TyKind::OpaqueDef(item_id, lifetimes, _in_trait) => {
hir::TyKind::OpaqueDef(item_id, lifetimes) => {
// Resolve the lifetimes in the bounds to the lifetime defs in the generics.
// `fn foo<'a>() -> impl MyTrait<'a> { ... }` desugars to
// `type MyAnonTy<'b> = impl MyTrait<'b>;`

8
compiler/rustc_hir_analysis/src/collect/type_of.rs
View File

@ -618,11 +618,13 @@ pub(super) fn type_of_opaque(
// Opaque types desugared from `impl Trait`.
ItemKind::OpaqueTy(&OpaqueTy {
origin:
hir::OpaqueTyOrigin::FnReturn(owner) | hir::OpaqueTyOrigin::AsyncFn(owner),
in_trait,
hir::OpaqueTyOrigin::FnReturn { parent: owner, in_trait_or_impl }
| hir::OpaqueTyOrigin::AsyncFn { parent: owner, in_trait_or_impl },
..
}) => {
if in_trait && !tcx.defaultness(owner).has_value() {
if in_trait_or_impl == Some(hir::RpitContext::Trait)
&& !tcx.defaultness(owner).has_value()
{
span_bug!(
tcx.def_span(def_id),
"tried to get type of this RPITIT with no definition"

36
compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs
View File

@ -2087,21 +2087,41 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
let opt_self_ty = maybe_qself.as_ref().map(|qself| self.lower_ty(qself));
self.lower_path(opt_self_ty, path, hir_ty.hir_id, false)
}
&hir::TyKind::OpaqueDef(item_id, lifetimes, in_trait) => {
&hir::TyKind::OpaqueDef(item_id, lifetimes) => {
let opaque_ty = tcx.hir().item(item_id);
match opaque_ty.kind {
hir::ItemKind::OpaqueTy(&hir::OpaqueTy { .. }) => {
hir::ItemKind::OpaqueTy(&hir::OpaqueTy { origin, .. }) => {
let local_def_id = item_id.owner_id.def_id;
// If this is an RPITIT and we are using the new RPITIT lowering scheme, we
// generate the def_id of an associated type for the trait and return as
// type a projection.
let def_id = if in_trait {
tcx.associated_type_for_impl_trait_in_trait(local_def_id).to_def_id()
} else {
local_def_id.to_def_id()
};
self.lower_opaque_ty(def_id, lifetimes, in_trait)
match origin {
hir::OpaqueTyOrigin::FnReturn {
in_trait_or_impl: Some(hir::RpitContext::Trait),
..
}
| hir::OpaqueTyOrigin::AsyncFn {
in_trait_or_impl: Some(hir::RpitContext::Trait),
..
} => self.lower_opaque_ty(
tcx.associated_type_for_impl_trait_in_trait(local_def_id)
.to_def_id(),
lifetimes,
true,
),
hir::OpaqueTyOrigin::FnReturn {
in_trait_or_impl: None | Some(hir::RpitContext::TraitImpl),
..
}
| hir::OpaqueTyOrigin::AsyncFn {
in_trait_or_impl: None | Some(hir::RpitContext::TraitImpl),
..
}
| hir::OpaqueTyOrigin::TyAlias { .. } => {
self.lower_opaque_ty(local_def_id.to_def_id(), lifetimes, false)
}
}
}
ref i => bug!("`impl Trait` pointed to non-opaque type?? {:#?}", i),
}

3
compiler/rustc_hir_typeck/src/_match.rs
View File

@ -602,7 +602,8 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
.map(|(k, _)| (k.def_id, k.args))?,
_ => return None,
};
let hir::OpaqueTyOrigin::FnReturn(parent_def_id) = self.tcx.opaque_type_origin(def_id)
let hir::OpaqueTyOrigin::FnReturn { parent: parent_def_id, .. } =
self.tcx.opaque_type_origin(def_id)
else {
return None;
};

4
compiler/rustc_lint/src/impl_trait_overcaptures.rs
View File

@ -259,8 +259,8 @@ where
// If it's owned by this function
&& let opaque =
self.tcx.hir_node_by_def_id(opaque_def_id).expect_item().expect_opaque_ty()
&& let hir::OpaqueTyOrigin::FnReturn(parent_def_id) = opaque.origin
&& parent_def_id == self.parent_def_id
&& let hir::OpaqueTyOrigin::FnReturn { parent, .. } = opaque.origin
&& parent == self.parent_def_id
{
let opaque_span = self.tcx.def_span(opaque_def_id);
let new_capture_rules =

10
compiler/rustc_lint/src/opaque_hidden_inferred_bound.rs
View File

@ -77,7 +77,7 @@ impl<'tcx> LateLintPass<'tcx> for OpaqueHiddenInferredBound {
// That's because although we may have an opaque type on the function,
// it won't have a hidden type, so proving predicates about it is
// not really meaningful.
if let hir::OpaqueTyOrigin::FnReturn(method_def_id) = opaque.origin
if let hir::OpaqueTyOrigin::FnReturn { parent: method_def_id, .. } = opaque.origin
&& let hir::Node::TraitItem(trait_item) = cx.tcx.hir_node_by_def_id(method_def_id)
&& !trait_item.defaultness.has_value()
{
@ -103,7 +103,7 @@ impl<'tcx> LateLintPass<'tcx> for OpaqueHiddenInferredBound {
&& cx.tcx.parent(opaque_ty.def_id) == def_id
&& matches!(
opaque.origin,
hir::OpaqueTyOrigin::FnReturn(_) | hir::OpaqueTyOrigin::AsyncFn(_)
hir::OpaqueTyOrigin::FnReturn { .. } | hir::OpaqueTyOrigin::AsyncFn { .. }
)
{
return;
@ -114,8 +114,10 @@ impl<'tcx> LateLintPass<'tcx> for OpaqueHiddenInferredBound {
// return type is well-formed in traits even when `Self` isn't sized.
if let ty::Param(param_ty) = *proj_term.kind()
&& param_ty.name == kw::SelfUpper
&& matches!(opaque.origin, hir::OpaqueTyOrigin::AsyncFn(_))
&& opaque.in_trait
&& matches!(opaque.origin, hir::OpaqueTyOrigin::AsyncFn {
in_trait_or_impl: Some(hir::RpitContext::Trait),
..
})
{
return;
}

6
compiler/rustc_metadata/src/rmeta/encoder.rs
View File

@ -1186,9 +1186,9 @@ fn should_encode_type(tcx: TyCtxt<'_>, def_id: LocalDefId, def_kind: DefKind) ->
DefKind::OpaqueTy => {
let origin = tcx.opaque_type_origin(def_id);
if let hir::OpaqueTyOrigin::FnReturn(fn_def_id)
| hir::OpaqueTyOrigin::AsyncFn(fn_def_id) = origin
&& let hir::Node::TraitItem(trait_item) = tcx.hir_node_by_def_id(fn_def_id)
if let hir::OpaqueTyOrigin::FnReturn { parent, .. }
| hir::OpaqueTyOrigin::AsyncFn { parent, .. } = origin
&& let hir::Node::TraitItem(trait_item) = tcx.hir_node_by_def_id(parent)
&& let (_, hir::TraitFn::Required(..)) = trait_item.expect_fn()
{
false

8
compiler/rustc_middle/src/hir/map/mod.rs
View File

@ -1139,13 +1139,7 @@ fn hir_id_to_string(map: Map<'_>, id: HirId) -> String {
ItemKind::ForeignMod { .. } => "foreign mod",
ItemKind::GlobalAsm(..) => "global asm",
ItemKind::TyAlias(..) => "ty",
ItemKind::OpaqueTy(opaque) => {
if opaque.in_trait {
"opaque type in trait"
} else {
"opaque type"
}
}
ItemKind::OpaqueTy(..) => "opaque type",
ItemKind::Enum(..) => "enum",
ItemKind::Struct(..) => "struct",
ItemKind::Union(..) => "union",

2
compiler/rustc_middle/src/ty/diagnostics.rs
View File

@ -510,7 +510,7 @@ impl<'v> hir::intravisit::Visitor<'v> for TraitObjectVisitor<'v> {
) => {
self.0.push(ty);
}
hir::TyKind::OpaqueDef(item_id, _, _) => {
hir::TyKind::OpaqueDef(item_id, _) => {
self.0.push(ty);
let item = self.1.item(item_id);
hir::intravisit::walk_item(self, item);

2
compiler/rustc_passes/src/dead.rs
View File

@ -656,7 +656,7 @@ impl<'tcx> Visitor<'tcx> for MarkSymbolVisitor<'tcx> {
}
fn visit_ty(&mut self, ty: &'tcx hir::Ty<'tcx>) {
if let TyKind::OpaqueDef(item_id, _, _) = ty.kind {
if let TyKind::OpaqueDef(item_id, _) = ty.kind {
let item = self.tcx.hir().item(item_id);
intravisit::walk_item(self, item);
}

47
compiler/rustc_privacy/src/lib.rs
View File

@ -637,17 +637,44 @@ impl<'tcx> Visitor<'tcx> for EmbargoVisitor<'tcx> {
fn visit_item(&mut self, item: &'tcx hir::Item<'tcx>) {
if self.impl_trait_pass
&& let hir::ItemKind::OpaqueTy(opaque) = item.kind
&& !opaque.in_trait
{
// FIXME: This is some serious pessimization intended to workaround deficiencies
// in the reachability pass (`middle/reachable.rs`). Types are marked as link-time
// reachable if they are returned via `impl Trait`, even from private functions.
let pub_ev = EffectiveVisibility::from_vis(ty::Visibility::Public);
self.reach_through_impl_trait(item.owner_id.def_id, pub_ev)
.generics()
.predicates()
.ty();
return;
let should_visit = match opaque.origin {
hir::OpaqueTyOrigin::FnReturn {
parent,
in_trait_or_impl: Some(hir::RpitContext::Trait),
}
| hir::OpaqueTyOrigin::AsyncFn {
parent,
in_trait_or_impl: Some(hir::RpitContext::Trait),
} => match self.tcx.hir_node_by_def_id(parent).expect_trait_item().expect_fn().1 {
hir::TraitFn::Required(_) => false,
hir::TraitFn::Provided(..) => true,
},
// Always visit RPITs in functions that have definitions,
// and all TAITs.
hir::OpaqueTyOrigin::FnReturn {
in_trait_or_impl: None | Some(hir::RpitContext::TraitImpl),
..
}
| hir::OpaqueTyOrigin::AsyncFn {
in_trait_or_impl: None | Some(hir::RpitContext::TraitImpl),
..
}
| hir::OpaqueTyOrigin::TyAlias { .. } => true,
};
if should_visit {
// FIXME: This is some serious pessimization intended to workaround deficiencies
// in the reachability pass (`middle/reachable.rs`). Types are marked as link-time
// reachable if they are returned via `impl Trait`, even from private functions.
let pub_ev = EffectiveVisibility::from_vis(ty::Visibility::Public);
self.reach_through_impl_trait(item.owner_id.def_id, pub_ev)
.generics()
.predicates()
.ty();
return;
}
}
// Update levels of nested things and mark all items

2
compiler/rustc_trait_selection/src/error_reporting/infer/nice_region_error/static_impl_trait.rs
View File

@ -284,7 +284,7 @@ pub fn suggest_new_region_bound(
}
match fn_return.kind {
// FIXME(precise_captures): Suggest adding to `use<...>` list instead.
TyKind::OpaqueDef(item_id, _, _) => {
TyKind::OpaqueDef(item_id, _) => {
let item = tcx.hir().item(item_id);
let ItemKind::OpaqueTy(opaque) = &item.kind else {
return;

4
compiler/rustc_trait_selection/src/error_reporting/infer/region.rs
View File

@ -857,7 +857,7 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
}
fn visit_ty(&mut self, ty: &'hir hir::Ty<'hir>) {
let hir::TyKind::OpaqueDef(item_id, _, _) = ty.kind else {
let hir::TyKind::OpaqueDef(item_id, _) = ty.kind else {
return hir::intravisit::walk_ty(self, ty);
};
let opaque_ty = self.tcx.hir().item(item_id).expect_opaque_ty();
@ -1271,7 +1271,7 @@ fn suggest_precise_capturing<'tcx>(
let hir::OpaqueTy { bounds, origin, .. } =
tcx.hir_node_by_def_id(opaque_def_id).expect_item().expect_opaque_ty();
let hir::OpaqueTyOrigin::FnReturn(fn_def_id) = *origin else {
let hir::OpaqueTyOrigin::FnReturn { parent: fn_def_id, .. } = *origin else {
return;
};

2
compiler/rustc_trait_selection/src/error_reporting/traits/fulfillment_errors.rs
View File

@ -2640,7 +2640,7 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
def_id: DefId,
) -> ErrorGuaranteed {
let name = match self.tcx.opaque_type_origin(def_id.expect_local()) {
hir::OpaqueTyOrigin::FnReturn(_) | hir::OpaqueTyOrigin::AsyncFn(_) => {
hir::OpaqueTyOrigin::FnReturn { .. } | hir::OpaqueTyOrigin::AsyncFn { .. } => {
"opaque type".to_string()
}
hir::OpaqueTyOrigin::TyAlias { .. } => {

5
compiler/rustc_ty_utils/src/assoc.rs
View File

@ -323,7 +323,7 @@ fn associated_types_for_impl_traits_in_associated_fn(
impl<'tcx> Visitor<'tcx> for RPITVisitor<'tcx> {
fn visit_ty(&mut self, ty: &'tcx hir::Ty<'tcx>) {
if let hir::TyKind::OpaqueDef(item_id, _, _) = ty.kind
if let hir::TyKind::OpaqueDef(item_id, _) = ty.kind
&& self.rpits.insert(item_id.owner_id.def_id)
{
let opaque_item =
@ -379,7 +379,8 @@ fn associated_type_for_impl_trait_in_trait(
tcx: TyCtxt<'_>,
opaque_ty_def_id: LocalDefId,
) -> LocalDefId {
let (hir::OpaqueTyOrigin::FnReturn(fn_def_id) | hir::OpaqueTyOrigin::AsyncFn(fn_def_id)) =
let (hir::OpaqueTyOrigin::FnReturn { parent: fn_def_id, .. }
| hir::OpaqueTyOrigin::AsyncFn { parent: fn_def_id, .. }) =
tcx.opaque_type_origin(opaque_ty_def_id)
else {
bug!("expected opaque for {opaque_ty_def_id:?}");

3
compiler/rustc_ty_utils/src/opaque_types.rs
View File

@ -141,7 +141,8 @@ impl<'tcx> OpaqueTypeCollector<'tcx> {
let origin = self.tcx.opaque_type_origin(alias_ty.def_id.expect_local());
trace!(?origin);
match origin {
rustc_hir::OpaqueTyOrigin::FnReturn(_) | rustc_hir::OpaqueTyOrigin::AsyncFn(_) => {}
rustc_hir::OpaqueTyOrigin::FnReturn { .. }
| rustc_hir::OpaqueTyOrigin::AsyncFn { .. } => {}
rustc_hir::OpaqueTyOrigin::TyAlias { in_assoc_ty, .. } => {
if !in_assoc_ty && !self.check_tait_defining_scope(alias_ty.def_id.expect_local()) {
return;

2
src/librustdoc/clean/mod.rs
View File

@ -1828,7 +1828,7 @@ pub(crate) fn clean_ty<'tcx>(ty: &hir::Ty<'tcx>, cx: &mut DocContext<'tcx>) -> T
Array(Box::new(clean_ty(ty, cx)), length.into())
}
TyKind::Tup(tys) => Tuple(tys.iter().map(|ty| clean_ty(ty, cx)).collect()),
TyKind::OpaqueDef(item_id, _, _) => {
TyKind::OpaqueDef(item_id, _) => {
let item = cx.tcx.hir().item(item_id);
if let hir::ItemKind::OpaqueTy(ty) = item.kind {
ImplTrait(ty.bounds.iter().filter_map(|x| clean_generic_bound(x, cx)).collect())

2
src/librustdoc/visit_ast.rs
View File

@ -515,7 +515,7 @@ impl<'a, 'tcx> RustdocVisitor<'a, 'tcx> {
self.add_to_current_mod(item, renamed, import_id);
}
hir::ItemKind::OpaqueTy(hir::OpaqueTy {
origin: hir::OpaqueTyOrigin::AsyncFn(_) | hir::OpaqueTyOrigin::FnReturn(_),
origin: hir::OpaqueTyOrigin::AsyncFn { .. } | hir::OpaqueTyOrigin::FnReturn { .. },
..
}) => {
// return-position impl traits are never nameable, and should never be documented.

2
src/tools/clippy/clippy_lints/src/extra_unused_type_parameters.rs
View File

@ -199,7 +199,7 @@ impl<'tcx> Visitor<'tcx> for TypeWalker<'_, 'tcx> {
fn visit_ty(&mut self, t: &'tcx Ty<'tcx>) {
if let Some((def_id, _)) = t.peel_refs().as_generic_param() {
self.ty_params.remove(&def_id);
} else if let TyKind::OpaqueDef(id, _, _) = t.kind {
} else if let TyKind::OpaqueDef(id, _) = t.kind {
// Explicitly walk OpaqueDef. Normally `walk_ty` would do the job, but it calls
// `visit_nested_item`, which checks that `Self::NestedFilter::INTER` is set. We're
// using `OnlyBodies`, so the check ends up failing and the type isn't fully walked.

2
src/tools/clippy/clippy_lints/src/len_zero.rs
View File

@ -313,7 +313,7 @@ fn extract_future_output<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> Option<&
kind: ItemKind::OpaqueTy(opaque),
..
} = item
&& let OpaqueTyOrigin::AsyncFn(_) = opaque.origin
&& let OpaqueTyOrigin::AsyncFn { .. } = opaque.origin
&& let [GenericBound::Trait(trait_ref, _)] = &opaque.bounds
&& let Some(segment) = trait_ref.trait_ref.path.segments.last()
&& let Some(generic_args) = segment.args

2
src/tools/clippy/clippy_lints/src/lifetimes.rs
View File

@ -420,7 +420,7 @@ impl<'tcx> Visitor<'tcx> for RefVisitor<'_, 'tcx> {
fn visit_ty(&mut self, ty: &'tcx Ty<'_>) {
match ty.kind {
TyKind::OpaqueDef(item, bounds, _) => {
TyKind::OpaqueDef(item, bounds) => {
let map = self.cx.tcx.hir();
let item = map.item(item);
let len = self.lts.len();

2
src/tools/clippy/clippy_lints/src/manual_async_fn.rs
View File

@ -105,7 +105,7 @@ fn future_trait_ref<'tcx>(
cx: &LateContext<'tcx>,
ty: &'tcx Ty<'tcx>,
) -> Option<(&'tcx TraitRef<'tcx>, Vec<LifetimeName>)> {
if let TyKind::OpaqueDef(item_id, bounds, false) = ty.kind
if let TyKind::OpaqueDef(item_id, bounds) = ty.kind
&& let item = cx.tcx.hir().item(item_id)
&& let ItemKind::OpaqueTy(opaque) = &item.kind
&& let Some(trait_ref) = opaque.bounds.iter().find_map(|bound| {

3
src/tools/clippy/clippy_utils/src/hir_utils.rs
View File

@ -1126,9 +1126,8 @@ impl<'a, 'tcx> SpanlessHash<'a, 'tcx> {
}
},
TyKind::Path(ref qpath) => self.hash_qpath(qpath),
TyKind::OpaqueDef(_, arg_list, in_trait) => {
TyKind::OpaqueDef(_, arg_list) => {
self.hash_generic_args(arg_list);
in_trait.hash(&mut self.s);
},
TyKind::TraitObject(_, lifetime, _) => {
self.hash_lifetime(lifetime);