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Auto merge of #121796 - oli-obk:eager_opaque_checks3, r=lcnr

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Make `DefiningAnchor::Bind` only store the opaque types that may be constrained, instead of the current infcx root item.

This makes `Bind` almost always be empty, so we can start forwarding it to queries, allowing us to remove `Bubble` entirely (not done in this PR)

The only behaviour change is in diagnostics.

r? `@lcnr` `@compiler-errors`
This commit is contained in:
bors 2024-03-11 19:01:15 +00:00
commit 4ccbb7dc95
48 changed files with 322 additions and 251 deletions
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2
compiler/rustc_borrowck/src/consumers.rs
View File

@ -106,7 +106,7 @@ pub fn get_body_with_borrowck_facts(
options: ConsumerOptions,
) -> BodyWithBorrowckFacts<'_> {
let (input_body, promoted) = tcx.mir_promoted(def);
let infcx = tcx.infer_ctxt().with_opaque_type_inference(DefiningAnchor::Bind(def)).build();
let infcx = tcx.infer_ctxt().with_opaque_type_inference(DefiningAnchor::bind(tcx, def)).build();
let input_body: &Body<'_> = &input_body.borrow();
let promoted: &IndexSlice<_, _> = &promoted.borrow();
*super::do_mir_borrowck(&infcx, input_body, promoted, Some(options)).1.unwrap()

5
compiler/rustc_borrowck/src/lib.rs
View File

@ -126,10 +126,7 @@ fn mir_borrowck(tcx: TyCtxt<'_>, def: LocalDefId) -> &BorrowCheckResult<'_> {
return tcx.arena.alloc(result);
}
let hir_owner = tcx.local_def_id_to_hir_id(def).owner;
let infcx =
tcx.infer_ctxt().with_opaque_type_inference(DefiningAnchor::Bind(hir_owner.def_id)).build();
let infcx = tcx.infer_ctxt().with_opaque_type_inference(DefiningAnchor::bind(tcx, def)).build();
let promoted: &IndexSlice<_, _> = &promoted.borrow();
let opt_closure_req = do_mir_borrowck(&infcx, input_body, promoted, None).0;
debug!("mir_borrowck done");

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

@ -311,13 +311,13 @@ fn check_opaque_type_well_formed<'tcx>(
parent_def_id = tcx.local_parent(parent_def_id);
}
// FIXME(-Znext-solver): We probably should use `DefiningAnchor::Error`
// FIXME(-Znext-solver): We probably should use `DefiningAnchor::Bind(&[])`
// and prepopulate this `InferCtxt` with known opaque values, rather than
// using the `Bind` anchor here. For now it's fine.
let infcx = tcx
.infer_ctxt()
.with_next_trait_solver(next_trait_solver)
.with_opaque_type_inference(DefiningAnchor::Bind(parent_def_id))
.with_opaque_type_inference(DefiningAnchor::bind(tcx, parent_def_id))
.build();
let ocx = ObligationCtxt::new(&infcx);
let identity_args = GenericArgs::identity_for_item(tcx, def_id);

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

@ -347,7 +347,7 @@ fn check_opaque_meets_bounds<'tcx>(
let infcx = tcx
.infer_ctxt()
.with_opaque_type_inference(DefiningAnchor::Bind(defining_use_anchor))
.with_opaque_type_inference(DefiningAnchor::bind(tcx, defining_use_anchor))
.build();
let ocx = ObligationCtxt::new(&infcx);
@ -1558,7 +1558,7 @@ pub(super) fn check_coroutine_obligations(
.ignoring_regions()
// Bind opaque types to type checking root, as they should have been checked by borrowck,
// but may show up in some cases, like when (root) obligations are stalled in the new solver.
.with_opaque_type_inference(DefiningAnchor::Bind(typeck.hir_owner.def_id))
.with_opaque_type_inference(DefiningAnchor::bind(tcx, typeck.hir_owner.def_id))
.build();
let mut fulfillment_cx = <dyn TraitEngine<'_>>::new(&infcx);

2
compiler/rustc_hir_typeck/src/inherited.rs
View File

@ -79,7 +79,7 @@ pub fn new(tcx: TyCtxt<'tcx>, def_id: LocalDefId) -> Self {
let infcx = tcx
.infer_ctxt()
.ignoring_regions()
.with_opaque_type_inference(DefiningAnchor::Bind(def_id))
.with_opaque_type_inference(DefiningAnchor::bind(tcx, def_id))
.build();
let typeck_results = RefCell::new(ty::TypeckResults::new(hir_owner));

13
compiler/rustc_infer/src/infer/mod.rs
View File

@ -242,9 +242,10 @@ pub struct InferCtxt<'tcx> {
/// short lived InferCtxt within queries. The opaque type obligations are forwarded
/// to the outside until the end up in an `InferCtxt` for typeck or borrowck.
///
/// Its default value is `DefiningAnchor::Error`, this way it is easier to catch errors that
/// Its default value is `DefiningAnchor::Bind(&[])`, which means no opaque types may be defined.
/// This way it is easier to catch errors that
/// might come up during inference or typeck.
pub defining_use_anchor: DefiningAnchor,
pub defining_use_anchor: DefiningAnchor<'tcx>,
/// Whether this inference context should care about region obligations in
/// the root universe. Most notably, this is used during hir typeck as region
@ -605,7 +606,7 @@ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
/// Used to configure inference contexts before their creation.
pub struct InferCtxtBuilder<'tcx> {
tcx: TyCtxt<'tcx>,
defining_use_anchor: DefiningAnchor,
defining_use_anchor: DefiningAnchor<'tcx>,
considering_regions: bool,
skip_leak_check: bool,
/// Whether we are in coherence mode.
@ -620,7 +621,7 @@ impl<'tcx> TyCtxt<'tcx> {
fn infer_ctxt(self) -> InferCtxtBuilder<'tcx> {
InferCtxtBuilder {
tcx: self,
defining_use_anchor: DefiningAnchor::Error,
defining_use_anchor: DefiningAnchor::Bind(ty::List::empty()),
considering_regions: true,
skip_leak_check: false,
intercrate: false,
@ -636,7 +637,7 @@ impl<'tcx> InferCtxtBuilder<'tcx> {
/// It is only meant to be called in two places, for typeck
/// (via `Inherited::build`) and for the inference context used
/// in mir borrowck.
pub fn with_opaque_type_inference(mut self, defining_use_anchor: DefiningAnchor) -> Self {
pub fn with_opaque_type_inference(mut self, defining_use_anchor: DefiningAnchor<'tcx>) -> Self {
self.defining_use_anchor = defining_use_anchor;
self
}
@ -1208,13 +1209,11 @@ pub fn get_region_var_origins(&self) -> VarInfos {
#[instrument(level = "debug", skip(self), ret)]
pub fn take_opaque_types(&self) -> opaque_types::OpaqueTypeMap<'tcx> {
debug_assert_ne!(self.defining_use_anchor, DefiningAnchor::Error);
std::mem::take(&mut self.inner.borrow_mut().opaque_type_storage.opaque_types)
}
#[instrument(level = "debug", skip(self), ret)]
pub fn clone_opaque_types(&self) -> opaque_types::OpaqueTypeMap<'tcx> {
debug_assert_ne!(self.defining_use_anchor, DefiningAnchor::Error);
self.inner.borrow().opaque_type_storage.opaque_types.clone()
}

65
compiler/rustc_infer/src/infer/opaque_types/mod.rs
View File

@ -150,9 +150,6 @@ pub fn handle_opaque_type(
}
}
DefiningAnchor::Bubble => {}
DefiningAnchor::Error => {
return None;
}
}
if let ty::Alias(ty::Opaque, ty::AliasTy { def_id: b_def_id, .. }) = *b.kind() {
// We could accept this, but there are various ways to handle this situation, and we don't
@ -378,28 +375,14 @@ pub fn register_member_constraints(
/// in its defining scope.
#[instrument(skip(self), level = "trace", ret)]
pub fn opaque_type_origin(&self, def_id: LocalDefId) -> Option<OpaqueTyOrigin> {
let opaque_hir_id = self.tcx.local_def_id_to_hir_id(def_id);
let parent_def_id = match self.defining_use_anchor {
DefiningAnchor::Bubble | DefiningAnchor::Error => return None,
let defined_opaque_types = match self.defining_use_anchor {
DefiningAnchor::Bubble => return None,
DefiningAnchor::Bind(bind) => bind,
};
let origin = self.tcx.opaque_type_origin(def_id);
let in_definition_scope = match origin {
// Async `impl Trait`
hir::OpaqueTyOrigin::AsyncFn(parent) => parent == parent_def_id,
// Anonymous `impl Trait`
hir::OpaqueTyOrigin::FnReturn(parent) => parent == parent_def_id,
// Named `type Foo = impl Bar;`
hir::OpaqueTyOrigin::TyAlias { in_assoc_ty, .. } => {
if in_assoc_ty {
self.tcx.opaque_types_defined_by(parent_def_id).contains(&def_id)
} else {
may_define_opaque_type(self.tcx, parent_def_id, opaque_hir_id)
}
}
};
in_definition_scope.then_some(origin)
defined_opaque_types.contains(&def_id).then_some(origin)
}
}
@ -656,43 +639,3 @@ pub fn add_item_bounds_for_hidden_type(
}
}
}
/// Returns `true` if `opaque_hir_id` is a sibling or a child of a sibling of `def_id`.
///
/// Example:
/// ```ignore UNSOLVED (is this a bug?)
/// # #![feature(type_alias_impl_trait)]
/// pub mod foo {
/// pub mod bar {
/// pub trait Bar { /* ... */ }
/// pub type Baz = impl Bar;
///
/// # impl Bar for () {}
/// fn f1() -> Baz { /* ... */ }
/// }
/// fn f2() -> bar::Baz { /* ... */ }
/// }
/// ```
///
/// Here, `def_id` is the `LocalDefId` of the defining use of the opaque type (e.g., `f1` or `f2`),
/// and `opaque_hir_id` is the `HirId` of the definition of the opaque type `Baz`.
/// For the above example, this function returns `true` for `f1` and `false` for `f2`.
fn may_define_opaque_type(tcx: TyCtxt<'_>, def_id: LocalDefId, opaque_hir_id: hir::HirId) -> bool {
let mut hir_id = tcx.local_def_id_to_hir_id(def_id);
// Named opaque types can be defined by any siblings or children of siblings.
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().get_parent_item(hir_id).into();
}
// Syntactically, we are allowed to define the concrete type if:
let res = hir_id == scope;
trace!(
"may_define_opaque_type(def={:?}, opaque_node={:?}) = {}",
tcx.hir_node(hir_id),
tcx.hir_node(opaque_hir_id),
res
);
res
}

10
compiler/rustc_middle/src/mir/type_foldable.rs
View File

@ -1,6 +1,7 @@
//! `TypeFoldable` implementations for MIR types
use rustc_ast::InlineAsmTemplatePiece;
use rustc_hir::def_id::LocalDefId;
use super::*;
@ -44,6 +45,15 @@ fn try_fold_with<F: FallibleTypeFolder<TyCtxt<'tcx>>>(
}
}
impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for &'tcx ty::List<LocalDefId> {
fn try_fold_with<F: FallibleTypeFolder<TyCtxt<'tcx>>>(
self,
_folder: &mut F,
) -> Result<Self, F::Error> {
Ok(self)
}
}
impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for &'tcx ty::List<PlaceElem<'tcx>> {
fn try_fold_with<F: FallibleTypeFolder<TyCtxt<'tcx>>>(
self,

24
compiler/rustc_middle/src/traits/mod.rs
View File

@ -12,8 +12,8 @@
use crate::infer::canonical::Canonical;
use crate::mir::ConstraintCategory;
use crate::ty::abstract_const::NotConstEvaluatable;
use crate::ty::GenericArgsRef;
use crate::ty::{self, AdtKind, Ty};
use crate::ty::{GenericArgsRef, TyCtxt};
use rustc_data_structures::sync::Lrc;
use rustc_errors::{Applicability, Diag, EmissionGuarantee};
@ -1001,10 +1001,14 @@ pub enum CodegenObligationError {
/// opaques are replaced with inference vars eagerly in the old solver (e.g.
/// in projection, and in the signature during function type-checking).
#[derive(Debug, PartialEq, Eq, Clone, Copy, Hash, HashStable, TypeFoldable, TypeVisitable)]
pub enum DefiningAnchor {
/// Define opaques which are in-scope of the `LocalDefId`. Also, eagerly
/// replace opaque types in `replace_opaque_types_with_inference_vars`.
Bind(LocalDefId),
pub enum DefiningAnchor<'tcx> {
/// Define opaques which are in-scope of the current item being analyzed.
/// Also, eagerly replace these opaque types in `replace_opaque_types_with_inference_vars`.
///
/// If the list is empty, do not allow any opaques to be defined. This is used to catch type mismatch
/// errors when handling opaque types, and also should be used when we would
/// otherwise reveal opaques (such as [`Reveal::All`] reveal mode).
Bind(&'tcx ty::List<LocalDefId>),
/// In contexts where we don't currently know what opaques are allowed to be
/// defined, such as (old solver) canonical queries, we will simply allow
/// opaques to be defined, but "bubble" them up in the canonical response or
@ -1013,8 +1017,10 @@ pub enum DefiningAnchor {
/// We do not eagerly replace opaque types in `replace_opaque_types_with_inference_vars`,
/// which may affect what predicates pass and fail in the old trait solver.
Bubble,
/// Do not allow any opaques to be defined. This is used to catch type mismatch
/// errors when handling opaque types, and also should be used when we would
/// otherwise reveal opaques (such as [`Reveal::All`] reveal mode).
Error,
}
impl<'tcx> DefiningAnchor<'tcx> {
pub fn bind(tcx: TyCtxt<'tcx>, item: LocalDefId) -> Self {
Self::Bind(tcx.opaque_types_defined_by(item))
}
}

2
compiler/rustc_middle/src/traits/solve.rs
View File

@ -114,7 +114,7 @@ fn unify_with(self, other: MaybeCause) -> MaybeCause {
#[derive(Debug, PartialEq, Eq, Clone, Copy, Hash, HashStable, TypeFoldable, TypeVisitable)]
pub struct QueryInput<'tcx, T> {
pub goal: Goal<'tcx, T>,
pub anchor: DefiningAnchor,
pub anchor: DefiningAnchor<'tcx>,
pub predefined_opaques_in_body: PredefinedOpaques<'tcx>,
}

10
compiler/rustc_middle/src/ty/codec.rs
View File

@ -17,6 +17,7 @@
use crate::ty::GenericArgsRef;
use crate::ty::{self, AdtDef, Ty};
use rustc_data_structures::fx::FxHashMap;
use rustc_hir::def_id::LocalDefId;
use rustc_middle::ty::TyCtxt;
use rustc_serialize::{Decodable, Encodable};
use rustc_span::Span;
@ -431,6 +432,15 @@ fn decode(decoder: &mut D) -> &'tcx Self {
}
}
impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> RefDecodable<'tcx, D> for ty::List<LocalDefId> {
fn decode(decoder: &mut D) -> &'tcx Self {
let len = decoder.read_usize();
decoder.interner().mk_local_def_ids_from_iter(
(0..len).map::<LocalDefId, _>(|_| Decodable::decode(decoder)),
)
}
}
impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> RefDecodable<'tcx, D>
for ty::List<(VariantIdx, FieldIdx)>
{

8
compiler/rustc_middle/src/ty/context.rs
View File

@ -2014,6 +2014,14 @@ pub fn mk_local_def_ids(self, clauses: &[LocalDefId]) -> &'tcx List<LocalDefId>
self.intern_local_def_ids(clauses)
}
pub fn mk_local_def_ids_from_iter<I, T>(self, iter: I) -> T::Output
where
I: Iterator<Item = T>,
T: CollectAndApply<LocalDefId, &'tcx List<LocalDefId>>,
{
T::collect_and_apply(iter, |xs| self.mk_local_def_ids(xs))
}
pub fn mk_const_list_from_iter<I, T>(self, iter: I) -> T::Output
where
I: Iterator<Item = T>,

5
compiler/rustc_trait_selection/src/solve/eval_ctxt/mod.rs
View File

@ -16,7 +16,7 @@
CanonicalInput, CanonicalResponse, Certainty, IsNormalizesToHack, PredefinedOpaques,
PredefinedOpaquesData, QueryResult,
};
use rustc_middle::traits::{specialization_graph, DefiningAnchor};
use rustc_middle::traits::specialization_graph;
use rustc_middle::ty::{
self, InferCtxtLike, OpaqueTypeKey, Ty, TyCtxt, TypeFoldable, TypeSuperVisitable,
TypeVisitable, TypeVisitableExt, TypeVisitor,
@ -258,10 +258,7 @@ fn enter_canonical<R>(
// instead of taking them. This would cause an ICE here, since we have
// assertions against dropping an `InferCtxt` without taking opaques.
// FIXME: Once we remove support for the old impl we can remove this.
if input.anchor != DefiningAnchor::Error {
// This seems ok, but fragile.
let _ = infcx.take_opaque_types();
}
result
}

19
compiler/rustc_trait_selection/src/traits/error_reporting/type_err_ctxt_ext.rs
View File

@ -32,7 +32,7 @@
use rustc_infer::infer::error_reporting::TypeErrCtxt;
use rustc_infer::infer::{InferOk, TypeTrace};
use rustc_middle::traits::select::OverflowError;
use rustc_middle::traits::{DefiningAnchor, SignatureMismatchData};
use rustc_middle::traits::SignatureMismatchData;
use rustc_middle::ty::abstract_const::NotConstEvaluatable;
use rustc_middle::ty::error::{ExpectedFound, TypeError};
use rustc_middle::ty::fold::{BottomUpFolder, TypeFolder, TypeSuperFoldable};
@ -3390,19 +3390,12 @@ fn report_opaque_type_auto_trait_leakage(
obligation.cause.span,
format!("cannot check whether the hidden type of {name} satisfies auto traits"),
);
err.span_note(self.tcx.def_span(def_id), "opaque type is declared here");
match self.defining_use_anchor {
DefiningAnchor::Bubble | DefiningAnchor::Error => {}
DefiningAnchor::Bind(bind) => {
err.span_note(
self.tcx.def_ident_span(bind).unwrap_or_else(|| self.tcx.def_span(bind)),
"this item depends on auto traits of the hidden type, \
but may also be registering the hidden type. \
This is not supported right now. \
You can try moving the opaque type and the item that actually registers a hidden type into a new submodule".to_string(),
err.note(
"fetching the hidden types of an opaque inside of the defining scope is not supported. \
You can try moving the opaque type and the item that actually registers a hidden type into a new submodule",
);
}
};
err.span_note(self.tcx.def_span(def_id), "opaque type is declared here");
self.note_obligation_cause(&mut err, &obligation);
self.point_at_returns_when_relevant(&mut err, &obligation);

27
compiler/rustc_ty_utils/src/opaque_types.rs
View File

@ -54,7 +54,7 @@ fn visit_spanned(&mut self, span: Span, value: impl TypeVisitable<TyCtxt<'tcx>>)
self.span = old;
}
fn parent_trait_ref(&self) -> Option<ty::TraitRef<'tcx>> {
fn parent_impl_trait_ref(&self) -> Option<ty::TraitRef<'tcx>> {
let parent = self.parent()?;
if matches!(self.tcx.def_kind(parent), DefKind::Impl { .. }) {
Some(self.tcx.impl_trait_ref(parent)?.instantiate_identity())
@ -210,6 +210,7 @@ fn visit_ty(&mut self, t: Ty<'tcx>) {
ty::Alias(ty::Opaque, alias_ty) if alias_ty.def_id.is_local() => {
self.visit_opaque_ty(alias_ty);
}
// Skips type aliases, as they are meant to be transparent.
ty::Alias(ty::Weak, alias_ty) if alias_ty.def_id.is_local() => {
self.tcx
.type_of(alias_ty.def_id)
@ -220,11 +221,11 @@ fn visit_ty(&mut self, t: Ty<'tcx>) {
// This avoids having to do normalization of `Self::AssocTy` by only
// supporting the case of a method defining opaque types from assoc types
// in the same impl block.
if let Some(parent_trait_ref) = self.parent_trait_ref() {
if let Some(impl_trait_ref) = self.parent_impl_trait_ref() {
// If the trait ref of the associated item and the impl differs,
// then we can't use the impl's identity args below, so
// just skip.
if alias_ty.trait_ref(self.tcx) == parent_trait_ref {
if alias_ty.trait_ref(self.tcx) == impl_trait_ref {
let parent = self.parent().expect("we should have a parent here");
for &assoc in self.tcx.associated_items(parent).in_definition_order() {
@ -241,7 +242,7 @@ fn visit_ty(&mut self, t: Ty<'tcx>) {
let impl_args = alias_ty.args.rebase_onto(
self.tcx,
parent_trait_ref.def_id,
impl_trait_ref.def_id,
ty::GenericArgs::identity_for_item(self.tcx, parent),
);
@ -259,6 +260,24 @@ fn visit_ty(&mut self, t: Ty<'tcx>) {
}
}
}
} else if let Some(ty::ImplTraitInTraitData::Trait { fn_def_id, .. }) =
self.tcx.opt_rpitit_info(alias_ty.def_id)
&& fn_def_id == self.item.into()
{
// RPITIT in trait definitions get desugared to an associated type. For
// default methods we also create an opaque type this associated type
// normalizes to. The associated type is only known to normalize to the
// opaque if it is fully concrete. There could otherwise be an impl
// overwriting the default method.
//
// However, we have to be able to normalize the associated type while inside
// of the default method. This is normally handled by adding an unchecked
// `Projection(<Self as Trait>::synthetic_assoc_ty, trait_def::opaque)`
// assumption to the `param_env` of the default method. We also separately
// rely on that assumption here.
let ty = self.tcx.type_of(alias_ty.def_id).instantiate(self.tcx, alias_ty.args);
let ty::Alias(ty::Opaque, alias_ty) = ty.kind() else { bug!("{ty:?}") };
self.visit_opaque_ty(alias_ty);
}
}
ty::Adt(def, _) if def.did().is_local() => {

14
compiler/rustc_ty_utils/src/sig_types.rs
View File

@ -23,8 +23,14 @@ pub fn walk_types<'tcx, V: SpannedTypeVisitor<'tcx>>(
match kind {
// Walk over the signature of the function
DefKind::AssocFn | DefKind::Fn => {
let ty_sig = tcx.fn_sig(item).instantiate_identity();
let hir_sig = tcx.hir_node_by_def_id(item).fn_decl().unwrap();
// If the type of the item uses `_`, we're gonna error out anyway, but
// typeck (which type_of invokes below), will call back into opaque_types_defined_by
// causing a cycle. So we just bail out in this case.
if hir_sig.output.get_infer_ret_ty().is_some() {
return V::Result::output();
}
let ty_sig = tcx.fn_sig(item).instantiate_identity();
// Walk over the inputs and outputs manually in order to get good spans for them.
try_visit!(visitor.visit(hir_sig.output.span(), ty_sig.output()));
for (hir, ty) in hir_sig.inputs.iter().zip(ty_sig.inputs().iter()) {
@ -39,6 +45,12 @@ pub fn walk_types<'tcx, V: SpannedTypeVisitor<'tcx>>(
// Walk over the type of the item
DefKind::Static(_) | DefKind::Const | DefKind::AssocConst | DefKind::AnonConst => {
if let Some(ty) = tcx.hir_node_by_def_id(item).ty() {
// If the type of the item uses `_`, we're gonna error out anyway, but
// typeck (which type_of invokes below), will call back into opaque_types_defined_by
// causing a cycle. So we just bail out in this case.
if ty.is_suggestable_infer_ty() {
return V::Result::output();
}
// Associated types in traits don't necessarily have a type that we can visit
try_visit!(visitor.visit(ty.span, tcx.type_of(item).instantiate_identity()));
}

1
tests/ui/generic-associated-types/issue-88595.rs
View File

@ -19,4 +19,5 @@ impl<'a> A<'a> for C {
type B<'b> = impl Clone;
fn a(&'a self) -> Self::B<'a> {} //~ ERROR: non-defining opaque type use in defining scope
//~^ ERROR: non-defining opaque type use in defining scope
}

16
tests/ui/generic-associated-types/issue-88595.stderr
View File

@ -10,5 +10,19 @@ note: for this opaque type
LL | type B<'b> = impl Clone;
| ^^^^^^^^^^
error: aborting due to 1 previous error
error: non-defining opaque type use in defining scope
--> $DIR/issue-88595.rs:21:35
|
LL | fn a(&'a self) -> Self::B<'a> {}
| ^^
|
note: lifetime used multiple times
--> $DIR/issue-88595.rs:18:6
|
LL | impl<'a> A<'a> for C {
| ^^
LL | type B<'b> = impl Clone;
| ^^
error: aborting due to 2 previous errors

6
tests/ui/impl-trait/auto-trait-leak.stderr
View File

@ -6,16 +6,12 @@ LL | send(cycle1().clone());
| |
| required by a bound introduced by this call
|
= note: fetching the hidden types of an opaque inside of the defining scope is not supported. You can try moving the opaque type and the item that actually registers a hidden type into a new submodule
note: opaque type is declared here
--> $DIR/auto-trait-leak.rs:11:16
|
LL | fn cycle1() -> impl Clone {
| ^^^^^^^^^^
note: this item depends on auto traits of the hidden type, but may also be registering the hidden type. This is not supported right now. You can try moving the opaque type and the item that actually registers a hidden type into a new submodule
--> $DIR/auto-trait-leak.rs:17:4
|
LL | fn cycle2() -> impl Clone {
| ^^^^^^
note: required by a bound in `send`
--> $DIR/auto-trait-leak.rs:4:12
|

4
tests/ui/impl-trait/issues/issue-78722-2.rs
View File

@ -12,9 +12,9 @@ fn concrete_use() -> F {
//~^ ERROR future that resolves to `u8`, but it resolves to `()`
async {}
}
// FIXME(type_alias_impl_trait): inform the user about why `F` is not available here.
let f: F = async { 1 };
//~^ ERROR item constrains opaque type that is not in its signature
//~| ERROR `async` blocks are not allowed in constants
//~^ ERROR mismatched types
1
}],
}

33
tests/ui/impl-trait/issues/issue-78722-2.stderr
View File

@ -4,30 +4,21 @@ error[E0271]: expected `{async block@$DIR/issue-78722-2.rs:13:13: 13:21}` to be
LL | fn concrete_use() -> F {
| ^ expected `()`, found `u8`
error: item constrains opaque type that is not in its signature
--> $DIR/issue-78722-2.rs:15:20
error[E0308]: mismatched types
--> $DIR/issue-78722-2.rs:16:20
|
LL | type F = impl core::future::Future<Output = u8>;
| -------------------------------------- the expected future
...
LL | let f: F = async { 1 };
| ^^^^^^^^^^^
| - ^^^^^^^^^^^ expected future, found `async` block
| |
| expected due to this
|
= note: this item must mention the opaque type in its signature in order to be able to register hidden types
note: this item must mention the opaque type in its signature in order to be able to register hidden types
--> $DIR/issue-78722-2.rs:15:20
|
LL | let f: F = async { 1 };
| ^^^^^^^^^^^
= note: expected opaque type `F`
found `async` block `{async block@$DIR/issue-78722-2.rs:16:20: 16:31}`
error[E0658]: `async` blocks are not allowed in constants
--> $DIR/issue-78722-2.rs:15:20
|
LL | let f: F = async { 1 };
| ^^^^^^^^^^^
|
= note: see issue #85368 <https://github.com/rust-lang/rust/issues/85368> for more information
= help: add `#![feature(const_async_blocks)]` to the crate attributes to enable
= note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
error: aborting due to 2 previous errors
error: aborting due to 3 previous errors
Some errors have detailed explanations: E0271, E0658.
Some errors have detailed explanations: E0271, E0308.
For more information about an error, try `rustc --explain E0271`.

2
tests/ui/lint/issue-99387.rs
View File

@ -19,8 +19,8 @@ impl<'a> Tr for &'a () {
}
pub fn ohno<'a>() -> <&'a () as Tr>::Item {
//~^ ERROR item constrains opaque type that is not in its signature
None.into_iter()
//~^ ERROR mismatched types
}
fn main() {}

17
tests/ui/lint/issue-99387.stderr
View File

@ -1,11 +1,17 @@
error: item constrains opaque type that is not in its signature
--> $DIR/issue-99387.rs:21:22
error[E0308]: mismatched types
--> $DIR/issue-99387.rs:22:5
|
LL | pub type Successors<'a> = impl Iterator<Item = &'a ()>;
| ---------------------------- the expected opaque type
...
LL | pub fn ohno<'a>() -> <&'a () as Tr>::Item {
| ^^^^^^^^^^^^^^^^^^^^
| -------------------- expected `Successors<'a>` because of return type
LL | None.into_iter()
| ^^^^^^^^^^^^^^^^ expected opaque type, found `IntoIter<_>`
|
= note: this item must mention the opaque type in its signature in order to be able to register hidden types
note: this item must mention the opaque type in its signature in order to be able to register hidden types
= note: expected opaque type `Successors<'a>`
found struct `std::option::IntoIter<_>`
note: this item must have the opaque type in its signature in order to be able to register hidden types
--> $DIR/issue-99387.rs:21:8
|
LL | pub fn ohno<'a>() -> <&'a () as Tr>::Item {
@ -13,3 +19,4 @@ LL | pub fn ohno<'a>() -> <&'a () as Tr>::Item {
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0308`.

6
tests/ui/type-alias-impl-trait/auto-trait-leakage3.stderr
View File

@ -6,16 +6,12 @@ LL | is_send(foo());
| |
| required by a bound introduced by this call
|
= note: fetching the hidden types of an opaque inside of the defining scope is not supported. You can try moving the opaque type and the item that actually registers a hidden type into a new submodule
note: opaque type is declared here
--> $DIR/auto-trait-leakage3.rs:7:20
|
LL | pub type Foo = impl std::fmt::Debug;
| ^^^^^^^^^^^^^^^^^^^^
note: this item depends on auto traits of the hidden type, but may also be registering the hidden type. This is not supported right now. You can try moving the opaque type and the item that actually registers a hidden type into a new submodule
--> $DIR/auto-trait-leakage3.rs:12:12
|
LL | pub fn bar() {
| ^^^
note: required by a bound in `is_send`
--> $DIR/auto-trait-leakage3.rs:17:19
|

24
tests/ui/type-alias-impl-trait/generic_duplicate_param_use.stderr
View File

@ -34,18 +34,6 @@ note: for this opaque type
LL | type TwoLifetimes<'a, 'b> = impl Debug;
| ^^^^^^^^^^
error: non-defining opaque type use in defining scope
--> $DIR/generic_duplicate_param_use.rs:29:5
|
LL | t
| ^
|
note: lifetime used multiple times
--> $DIR/generic_duplicate_param_use.rs:17:19
|
LL | type TwoLifetimes<'a, 'b> = impl Debug;
| ^^ ^^
error: non-defining opaque type use in defining scope
--> $DIR/generic_duplicate_param_use.rs:33:50
|
@ -58,6 +46,18 @@ note: for this opaque type
LL | type TwoConsts<const X: usize, const Y: usize> = impl Debug;
| ^^^^^^^^^^
error: non-defining opaque type use in defining scope
--> $DIR/generic_duplicate_param_use.rs:29:5
|
LL | t
| ^
|
note: lifetime used multiple times
--> $DIR/generic_duplicate_param_use.rs:17:19
|
LL | type TwoLifetimes<'a, 'b> = impl Debug;
| ^^ ^^
error: non-defining opaque type use in defining scope
--> $DIR/generic_duplicate_param_use.rs:35:5
|

18
tests/ui/type-alias-impl-trait/generic_nondefining_use.stderr
View File

@ -31,15 +31,6 @@ note: for this opaque type
LL | type OneLifetime<'a> = impl Debug;
| ^^^^^^^^^^
error[E0792]: expected generic lifetime parameter, found `'static`
--> $DIR/generic_nondefining_use.rs:23:5
|
LL | type OneLifetime<'a> = impl Debug;
| -- cannot use static lifetime; use a bound lifetime instead or remove the lifetime parameter from the opaque type
...
LL | 6u32
| ^^^^
error[E0792]: non-defining opaque type use in defining scope
--> $DIR/generic_nondefining_use.rs:27:24
|
@ -52,6 +43,15 @@ note: for this opaque type
LL | type OneConst<const X: usize> = impl Debug;
| ^^^^^^^^^^
error[E0792]: expected generic lifetime parameter, found `'static`
--> $DIR/generic_nondefining_use.rs:23:5
|
LL | type OneLifetime<'a> = impl Debug;
| -- cannot use static lifetime; use a bound lifetime instead or remove the lifetime parameter from the opaque type
...
LL | 6u32
| ^^^^
error[E0792]: expected generic constant parameter, found `123`
--> $DIR/generic_nondefining_use.rs:29:5
|

2
tests/ui/type-alias-impl-trait/hidden_type_mismatch.rs
View File

@ -9,7 +9,6 @@
mod sus {
use super::*;
pub type Sep = impl Sized + std::fmt::Display;
//~^ ERROR: concrete type differs from previous defining opaque type use
pub fn mk_sep() -> Sep {
String::from("hello")
}
@ -42,6 +41,7 @@ pub fn define_tait() -> Tait
(): Proj<Assoc = i32>,
{
Bar { inner: 1i32, _marker: () }
//~^ ERROR type mismatch
}
}

27
tests/ui/type-alias-impl-trait/hidden_type_mismatch.stderr
View File

@ -1,14 +1,27 @@
error: concrete type differs from previous defining opaque type use
--> $DIR/hidden_type_mismatch.rs:11:20
error[E0271]: type mismatch resolving `<() as Proj>::Assoc == i32`
--> $DIR/hidden_type_mismatch.rs:43:9
|
LL | pub type Sep = impl Sized + std::fmt::Display;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `i32`, got `String`
| ------------------------------ the expected opaque type
...
LL | Bar { inner: 1i32, _marker: () }
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type mismatch resolving `<() as Proj>::Assoc == i32`
|
note: previous use here
--> $DIR/hidden_type_mismatch.rs:37:21
note: expected this to be `Sep`
--> $DIR/hidden_type_mismatch.rs:20:22
|
LL | pub type Tait = impl Copy + From<Bar<()>> + Into<Bar<()>>;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
LL | type Assoc = sus::Sep;
| ^^^^^^^^
= note: expected opaque type `Sep`
found type `i32`
note: required for `Bar<()>` to implement `Copy`
--> $DIR/hidden_type_mismatch.rs:32:39
|
LL | impl<T: Proj<Assoc = i32> + Copy> Copy for Bar<T> {}
| ----------- ^^^^ ^^^^^^
| |
| unsatisfied trait bound introduced here
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0271`.

2
tests/ui/type-alias-impl-trait/higher_kinded_params2.rs
View File

@ -24,7 +24,7 @@ impl<'a> B for &'a A {
impl Terminator {
fn successors(&self, mut f: for<'x> fn(&'x ()) -> <&'x A as B>::C) -> Successors<'_> {
f = g;
//~^ ERROR item constrains opaque type that is not in its signature
//~^ ERROR mismatched types
}
}

13
tests/ui/type-alias-impl-trait/higher_kinded_params2.stderr
View File

@ -1,11 +1,15 @@
error: item constrains opaque type that is not in its signature
error[E0308]: mismatched types
--> $DIR/higher_kinded_params2.rs:26:13
|
LL | type Tait = impl std::fmt::Debug;
| -------------------- the expected opaque type
...
LL | f = g;
| ^
| ^ expected fn pointer, found fn item
|
= note: this item must mention the opaque type in its signature in order to be able to register hidden types
note: this item must mention the opaque type in its signature in order to be able to register hidden types
= note: expected fn pointer `for<'x> fn(&'x ()) -> Tait`
found fn item `for<'a> fn(&'a ()) -> String {g}`
note: this item must have the opaque type in its signature in order to be able to register hidden types
--> $DIR/higher_kinded_params2.rs:25:8
|
LL | fn successors(&self, mut f: for<'x> fn(&'x ()) -> <&'x A as B>::C) -> Successors<'_> {
@ -13,3 +17,4 @@ LL | fn successors(&self, mut f: for<'x> fn(&'x ()) -> <&'x A as B>::C) -> S
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0308`.

1
tests/ui/type-alias-impl-trait/higher_kinded_params3.rs
View File

@ -25,7 +25,6 @@ impl Terminator {
fn successors(&self, mut f: for<'x> fn(&'x ()) -> <&'x A as B>::C) -> Successors<'_> {
f = g;
//~^ ERROR mismatched types
//~| ERROR item constrains opaque type that is not in its signature
}
}

26
tests/ui/type-alias-impl-trait/higher_kinded_params3.stderr
View File

@ -1,28 +1,20 @@
error: item constrains opaque type that is not in its signature
--> $DIR/higher_kinded_params3.rs:26:13
|
LL | f = g;
| ^
|
= note: this item must mention the opaque type in its signature in order to be able to register hidden types
note: this item must mention the opaque type in its signature in order to be able to register hidden types
--> $DIR/higher_kinded_params3.rs:25:8
|
LL | fn successors(&self, mut f: for<'x> fn(&'x ()) -> <&'x A as B>::C) -> Successors<'_> {
| ^^^^^^^^^^
error[E0308]: mismatched types
--> $DIR/higher_kinded_params3.rs:26:9
--> $DIR/higher_kinded_params3.rs:26:13
|
LL | type Tait<'a> = impl std::fmt::Debug + 'a;
| ------------------------- the expected opaque type
...
LL | f = g;
| ^^^^^ one type is more general than the other
| ^ expected fn pointer, found fn item
|
= note: expected fn pointer `for<'x> fn(&'x ()) -> Tait<'x>`
found fn pointer `for<'a> fn(&'a ()) -> &'a ()`
found fn item `for<'a> fn(&'a ()) -> &'a () {g}`
note: this item must have the opaque type in its signature in order to be able to register hidden types
--> $DIR/higher_kinded_params3.rs:25:8
|
LL | fn successors(&self, mut f: for<'x> fn(&'x ()) -> <&'x A as B>::C) -> Successors<'_> {
| ^^^^^^^^^^
error: aborting due to 2 previous errors
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0308`.

1
tests/ui/type-alias-impl-trait/implied_bounds_from_types.rs
View File

@ -12,6 +12,7 @@ impl<'a> Convert<'a> for () {
type Witness = WithLifetime<&'a ()>;
fn convert<'b, T: ?Sized>(_proof: &'b WithLifetime<&'a ()>, x: &'a T) -> &'b T {
//~^ ERROR non-defining opaque type use
// compiler used to think it gets to assume 'a: 'b here because
// of the `&'b WithLifetime<&'a ()>` argument
x

17
tests/ui/type-alias-impl-trait/implied_bounds_from_types.stderr
View File

@ -1,5 +1,17 @@
error[E0792]: non-defining opaque type use in defining scope
--> $DIR/implied_bounds_from_types.rs:14:39
|
LL | fn convert<'b, T: ?Sized>(_proof: &'b WithLifetime<&'a ()>, x: &'a T) -> &'b T {
| ^^^^^^^^^^^^^^^^^^^^^^^^ argument `&'a ()` is not a generic parameter
|
note: for this opaque type
--> $DIR/implied_bounds_from_types.rs:3:24
|
LL | type WithLifetime<T> = impl Equals<SelfType = ()>;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^
error: lifetime may not live long enough
--> $DIR/implied_bounds_from_types.rs:17:9
--> $DIR/implied_bounds_from_types.rs:18:9
|
LL | impl<'a> Convert<'a> for () {
| -- lifetime `'a` defined here
@ -12,5 +24,6 @@ LL | x
|
= help: consider adding the following bound: `'a: 'b`
error: aborting due to 1 previous error
error: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0792`.

6
tests/ui/type-alias-impl-trait/inference-cycle.stderr
View File

@ -6,16 +6,12 @@ LL | is_send(foo());
| |
| required by a bound introduced by this call
|
= note: fetching the hidden types of an opaque inside of the defining scope is not supported. You can try moving the opaque type and the item that actually registers a hidden type into a new submodule
note: opaque type is declared here
--> $DIR/inference-cycle.rs:5:20
|
LL | pub type Foo = impl std::fmt::Debug;
| ^^^^^^^^^^^^^^^^^^^^
note: this item depends on auto traits of the hidden type, but may also be registering the hidden type. This is not supported right now. You can try moving the opaque type and the item that actually registers a hidden type into a new submodule
--> $DIR/inference-cycle.rs:11:12
|
LL | pub fn bar() {
| ^^^
note: required by a bound in `is_send`
--> $DIR/inference-cycle.rs:21:19
|

1
tests/ui/type-alias-impl-trait/issue-53092-2.rs
View File

@ -4,6 +4,7 @@
type Bug<T, U> = impl Fn(T) -> U + Copy; //~ ERROR cycle detected
const CONST_BUG: Bug<u8, ()> = unsafe { std::mem::transmute(|_: u8| ()) };
//~^ ERROR: non-defining opaque type use
fn make_bug<T, U: From<T>>() -> Bug<T, U> {
|x| x.into() //~ ERROR the trait bound `U: From<T>` is not satisfied

20
tests/ui/type-alias-impl-trait/issue-53092-2.stderr
View File

@ -1,3 +1,15 @@
error[E0792]: non-defining opaque type use in defining scope
--> $DIR/issue-53092-2.rs:6:18
|
LL | const CONST_BUG: Bug<u8, ()> = unsafe { std::mem::transmute(|_: u8| ()) };
| ^^^^^^^^^^^ argument `u8` is not a generic parameter
|
note: for this opaque type
--> $DIR/issue-53092-2.rs:4:18
|
LL | type Bug<T, U> = impl Fn(T) -> U + Copy;
| ^^^^^^^^^^^^^^^^^^^^^^
error[E0391]: cycle detected when computing type of `Bug::{opaque#0}`
--> $DIR/issue-53092-2.rs:4:18
|
@ -25,13 +37,13 @@ LL | type Bug<T, U> = impl Fn(T) -> U + Copy;
= note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information
error[E0277]: the trait bound `U: From<T>` is not satisfied
--> $DIR/issue-53092-2.rs:9:5
--> $DIR/issue-53092-2.rs:10:5
|
LL | |x| x.into()
| ^^^^^^^^^^^^ the trait `From<T>` is not implemented for `U`
|
note: required by a bound in `make_bug`
--> $DIR/issue-53092-2.rs:8:19
--> $DIR/issue-53092-2.rs:9:19
|
LL | fn make_bug<T, U: From<T>>() -> Bug<T, U> {
| ^^^^^^^ required by this bound in `make_bug`
@ -40,7 +52,7 @@ help: consider restricting type parameter `U`
LL | type Bug<T, U: std::convert::From<T>> = impl Fn(T) -> U + Copy;
| +++++++++++++++++++++++
error: aborting due to 2 previous errors
error: aborting due to 3 previous errors
Some errors have detailed explanations: E0277, E0391.
Some errors have detailed explanations: E0277, E0391, E0792.
For more information about an error, try `rustc --explain E0277`.

1
tests/ui/type-alias-impl-trait/issue-53092.rs
View File

@ -9,6 +9,7 @@ union Moo {
}
const CONST_BUG: Bug<u8, ()> = unsafe { Moo { y: () }.x };
//~^ ERROR non-defining opaque type use
fn make_bug<T, U: From<T>>() -> Bug<T, U> {
|x| x.into() //~ ERROR the trait bound `U: From<T>` is not satisfied

21
tests/ui/type-alias-impl-trait/issue-53092.stderr
View File

@ -1,11 +1,23 @@
error[E0792]: non-defining opaque type use in defining scope
--> $DIR/issue-53092.rs:11:18
|
LL | const CONST_BUG: Bug<u8, ()> = unsafe { Moo { y: () }.x };
| ^^^^^^^^^^^ argument `u8` is not a generic parameter
|
note: for this opaque type
--> $DIR/issue-53092.rs:4:18
|
LL | type Bug<T, U> = impl Fn(T) -> U + Copy;
| ^^^^^^^^^^^^^^^^^^^^^^
error[E0277]: the trait bound `U: From<T>` is not satisfied
--> $DIR/issue-53092.rs:14:5
--> $DIR/issue-53092.rs:15:5
|
LL | |x| x.into()
| ^^^^^^^^^^^^ the trait `From<T>` is not implemented for `U`
|
note: required by a bound in `make_bug`
--> $DIR/issue-53092.rs:13:19
--> $DIR/issue-53092.rs:14:19
|
LL | fn make_bug<T, U: From<T>>() -> Bug<T, U> {
| ^^^^^^^ required by this bound in `make_bug`
@ -14,6 +26,7 @@ help: consider restricting type parameter `U`
LL | type Bug<T, U: std::convert::From<T>> = impl Fn(T) -> U + Copy;
| +++++++++++++++++++++++
error: aborting due to 1 previous error
error: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0277`.
Some errors have detailed explanations: E0277, E0792.
For more information about an error, try `rustc --explain E0277`.

2
tests/ui/type-alias-impl-trait/issue-70121.rs
View File

@ -15,8 +15,8 @@ impl<'a> Tr for &'a () {
}
pub fn kazusa<'a>() -> <&'a () as Tr>::Item {
//~^ ERROR item constrains opaque type that is not in its signature
None.into_iter()
//~^ ERROR mismatched types
}
fn main() {}

17
tests/ui/type-alias-impl-trait/issue-70121.stderr
View File

@ -1,11 +1,17 @@
error: item constrains opaque type that is not in its signature
--> $DIR/issue-70121.rs:17:24
error[E0308]: mismatched types
--> $DIR/issue-70121.rs:18:5
|
LL | pub type Successors<'a> = impl Iterator<Item = &'a ()>;
| ---------------------------- the expected opaque type
...
LL | pub fn kazusa<'a>() -> <&'a () as Tr>::Item {
| ^^^^^^^^^^^^^^^^^^^^
| -------------------- expected `Successors<'a>` because of return type
LL | None.into_iter()
| ^^^^^^^^^^^^^^^^ expected opaque type, found `IntoIter<_>`
|
= note: this item must mention the opaque type in its signature in order to be able to register hidden types
note: this item must mention the opaque type in its signature in order to be able to register hidden types
= note: expected opaque type `Successors<'a>`
found struct `std::option::IntoIter<_>`
note: this item must have the opaque type in its signature in order to be able to register hidden types
--> $DIR/issue-70121.rs:17:8
|
LL | pub fn kazusa<'a>() -> <&'a () as Tr>::Item {
@ -13,3 +19,4 @@ LL | pub fn kazusa<'a>() -> <&'a () as Tr>::Item {
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0308`.

2
tests/ui/type-alias-impl-trait/issue-77179.rs
View File

@ -7,7 +7,7 @@
fn test() -> Pointer<_> {
//~^ ERROR: the placeholder `_` is not allowed within types
Box::new(1)
//~^ ERROR: expected generic type parameter, found `i32`
//~^ ERROR: mismatched types
}
fn main() {

36
tests/ui/type-alias-impl-trait/issue-77179.stderr
View File

@ -1,11 +1,28 @@
error[E0308]: mismatched types
--> $DIR/issue-77179.rs:9:5
|
LL | type Pointer<T> = impl std::ops::Deref<Target = T>;
| -------------------------------- the expected opaque type
LL |
LL | fn test() -> Pointer<_> {
| ---------- expected `Pointer<_>` because of return type
LL |
LL | Box::new(1)
| ^^^^^^^^^^^ expected opaque type, found `Box<{integer}>`
|
= note: expected opaque type `Pointer<_>`
found struct `Box<{integer}>`
note: this item must have the opaque type in its signature in order to be able to register hidden types
--> $DIR/issue-77179.rs:7:4
|
LL | fn test() -> Pointer<_> {
| ^^^^
error[E0121]: the placeholder `_` is not allowed within types on item signatures for return types
--> $DIR/issue-77179.rs:7:22
|
LL | fn test() -> Pointer<_> {
| --------^-
| | |
| | not allowed in type signatures
| help: replace with the correct return type: `Pointer<i32>`
| ^ not allowed in type signatures
error[E0121]: the placeholder `_` is not allowed within types on item signatures for functions
--> $DIR/issue-77179.rs:18:25
@ -16,16 +33,7 @@ LL | fn bar() -> Pointer<_>;
| not allowed in type signatures
| help: use type parameters instead: `T`
error[E0792]: expected generic type parameter, found `i32`
--> $DIR/issue-77179.rs:9:5
|
LL | type Pointer<T> = impl std::ops::Deref<Target = T>;
| - this generic parameter must be used with a generic type parameter
...
LL | Box::new(1)
| ^^^^^^^^^^^
error: aborting due to 3 previous errors
Some errors have detailed explanations: E0121, E0792.
Some errors have detailed explanations: E0121, E0308.
For more information about an error, try `rustc --explain E0121`.

1
tests/ui/type-alias-impl-trait/multi-error.rs
View File

@ -17,6 +17,7 @@ impl Foo for () {
fn foo() -> (Self::Bar<u32>, Self::Baz) {
//~^ ERROR non-defining opaque type use
((), ())
//~^ ERROR expected generic type parameter
}
}

11
tests/ui/type-alias-impl-trait/multi-error.stderr
View File

@ -10,6 +10,15 @@ note: for this opaque type
LL | type Bar<T> = impl Sized;
| ^^^^^^^^^^
error: aborting due to 1 previous error
error[E0792]: expected generic type parameter, found `u32`
--> $DIR/multi-error.rs:19:9
|
LL | type Bar<T> = impl Sized;
| - this generic parameter must be used with a generic type parameter
...
LL | ((), ())
| ^^^^^^^^
error: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0792`.

1
tests/ui/type-alias-impl-trait/non-defining-method.rs
View File

@ -15,6 +15,7 @@ impl Foo for () {
type Bar<T> = impl Sized;
fn foo() -> Self::Bar<u32> {}
//~^ ERROR non-defining opaque type use
//~| ERROR expected generic type parameter, found `u32`
fn bar<T>() -> Self::Bar<T> {}
}

10
tests/ui/type-alias-impl-trait/non-defining-method.stderr
View File

@ -10,6 +10,14 @@ note: for this opaque type
LL | type Bar<T> = impl Sized;
| ^^^^^^^^^^
error: aborting due to 1 previous error
error[E0792]: expected generic type parameter, found `u32`
--> $DIR/non-defining-method.rs:16:32
|
LL | type Bar<T> = impl Sized;
| - this generic parameter must be used with a generic type parameter
LL | fn foo() -> Self::Bar<u32> {}
| ^^
error: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0792`.

12
tests/ui/type-alias-impl-trait/reveal_local.stderr
View File

@ -4,16 +4,12 @@ error: cannot check whether the hidden type of `reveal_local[9507]::Foo::{opaque
LL | is_send::<Foo>();
| ^^^
|
= note: fetching the hidden types of an opaque inside of the defining scope is not supported. You can try moving the opaque type and the item that actually registers a hidden type into a new submodule
note: opaque type is declared here
--> $DIR/reveal_local.rs:5:12
|
LL | type Foo = impl Debug;
| ^^^^^^^^^^
note: this item depends on auto traits of the hidden type, but may also be registering the hidden type. This is not supported right now. You can try moving the opaque type and the item that actually registers a hidden type into a new submodule
--> $DIR/reveal_local.rs:9:4
|
LL | fn not_good() {
| ^^^^^^^^
note: required by a bound in `is_send`
--> $DIR/reveal_local.rs:7:15
|
@ -26,16 +22,12 @@ error: cannot check whether the hidden type of `reveal_local[9507]::Foo::{opaque
LL | is_send::<Foo>();
| ^^^
|
= note: fetching the hidden types of an opaque inside of the defining scope is not supported. You can try moving the opaque type and the item that actually registers a hidden type into a new submodule
note: opaque type is declared here
--> $DIR/reveal_local.rs:5:12
|
LL | type Foo = impl Debug;
| ^^^^^^^^^^
note: this item depends on auto traits of the hidden type, but may also be registering the hidden type. This is not supported right now. You can try moving the opaque type and the item that actually registers a hidden type into a new submodule
--> $DIR/reveal_local.rs:16:4
|
LL | fn not_gooder() -> Foo {
| ^^^^^^^^^^
note: required by a bound in `is_send`
--> $DIR/reveal_local.rs:7:15
|