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Auto merge of #118133 - Urgau:stabilize_trait_upcasting, r=WaffleLapkin
Stabilize RFC3324 dyn upcasting coercion This PR stabilize the `trait_upcasting` feature, aka https://github.com/rust-lang/rfcs/pull/3324. The FCP was completed here: https://github.com/rust-lang/rust/issues/65991#issuecomment-1817552398. ~~And also remove the `deref_into_dyn_supertrait` lint which is now handled by dyn upcasting coercion.~~ Heavily inspired by https://github.com/rust-lang/rust/pull/101718 Fixes https://github.com/rust-lang/rust/issues/65991
This commit is contained in:
bors
commit
6d2b84b3ed
@ -338,6 +338,9 @@ declare_features! (
|
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/// Allows `#[track_caller]` to be used which provides
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/// accurate caller location reporting during panic (RFC 2091).
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(accepted, track_caller, "1.46.0", Some(47809), None),
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/// Allows dyn upcasting trait objects via supertraits.
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/// Dyn upcasting is casting, e.g., `dyn Foo -> dyn Bar` where `Foo: Bar`.
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(accepted, trait_upcasting, "CURRENT_RUSTC_VERSION", Some(65991), None),
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/// Allows #[repr(transparent)] on univariant enums (RFC 2645).
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(accepted, transparent_enums, "1.42.0", Some(60405), None),
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/// Allows indexing tuples.
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@ -562,9 +562,6 @@ declare_features! (
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(unstable, thread_local, "1.0.0", Some(29594), None),
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/// Allows defining `trait X = A + B;` alias items.
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(unstable, trait_alias, "1.24.0", Some(41517), None),
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/// Allows dyn upcasting trait objects via supertraits.
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/// Dyn upcasting is casting, e.g., `dyn Foo -> dyn Bar` where `Foo: Bar`.
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(unstable, trait_upcasting, "1.56.0", Some(65991), None),
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/// Allows for transmuting between arrays with sizes that contain generic consts.
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(unstable, transmute_generic_consts, "1.70.0", Some(109929), None),
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/// Allows #[repr(transparent)] on unions (RFC 2645).
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@ -626,7 +626,6 @@ impl<'f, 'tcx> Coerce<'f, 'tcx> {
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)];
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let mut has_unsized_tuple_coercion = false;
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let mut has_trait_upcasting_coercion = None;
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// Keep resolving `CoerceUnsized` and `Unsize` predicates to avoid
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// emitting a coercion in cases like `Foo<$1>` -> `Foo<$2>`, where
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@ -694,13 +693,6 @@ impl<'f, 'tcx> Coerce<'f, 'tcx> {
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// these here and emit a feature error if coercion doesn't fail
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// due to another reason.
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match impl_source {
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traits::ImplSource::Builtin(
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BuiltinImplSource::TraitUpcasting { .. },
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_,
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) => {
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has_trait_upcasting_coercion =
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Some((trait_pred.self_ty(), trait_pred.trait_ref.args.type_at(1)));
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}
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traits::ImplSource::Builtin(BuiltinImplSource::TupleUnsizing, _) => {
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has_unsized_tuple_coercion = true;
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}
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@ -711,21 +703,6 @@ impl<'f, 'tcx> Coerce<'f, 'tcx> {
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}
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}
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if let Some((sub, sup)) = has_trait_upcasting_coercion
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&& !self.tcx().features().trait_upcasting
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{
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// Renders better when we erase regions, since they're not really the point here.
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let (sub, sup) = self.tcx.erase_regions((sub, sup));
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let mut err = feature_err(
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&self.tcx.sess.parse_sess,
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sym::trait_upcasting,
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self.cause.span,
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format!("cannot cast `{sub}` to `{sup}`, trait upcasting coercion is experimental"),
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);
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err.note(format!("required when coercing `{source}` into `{target}`"));
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err.emit();
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}
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if has_unsized_tuple_coercion && !self.tcx.features().unsized_tuple_coercion {
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feature_err(
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&self.tcx.sess.parse_sess,
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@ -490,8 +490,9 @@ lint_requested_level = requested on the command line with `{$level} {$lint_name}
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lint_span_use_eq_ctxt = use `.eq_ctxt()` instead of `.ctxt() == .ctxt()`
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lint_supertrait_as_deref_target = `{$t}` implements `Deref` with supertrait `{$target_principal}` as target
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.label = target type is set here
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lint_supertrait_as_deref_target = this `Deref` implementation is covered by an implicit supertrait coercion
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.help = consider removing this implementation or replacing it with a method instead
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.label = target type is a supertrait of `{$t}`
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lint_suspicious_double_ref_clone =
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using `.clone()` on a double reference, which returns `{$ty}` instead of cloning the inner type
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@ -5,7 +5,6 @@ use crate::{
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use rustc_hir as hir;
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use rustc_middle::ty;
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use rustc_session::lint::FutureIncompatibilityReason;
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use rustc_span::sym;
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use rustc_trait_selection::traits::supertraits;
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@ -13,9 +12,6 @@ declare_lint! {
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/// The `deref_into_dyn_supertrait` lint is output whenever there is a use of the
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/// `Deref` implementation with a `dyn SuperTrait` type as `Output`.
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///
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/// These implementations will become shadowed when the `trait_upcasting` feature is stabilized.
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/// The `deref` functions will no longer be called implicitly, so there might be behavior change.
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///
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/// ### Example
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///
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/// ```rust,compile_fail
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@ -44,15 +40,10 @@ declare_lint! {
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///
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/// ### Explanation
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///
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/// The dyn upcasting coercion feature adds new coercion rules, taking priority
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/// over certain other coercion rules, which will cause some behavior change.
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/// The implicit dyn upcasting coercion take priority over those `Deref` impls.
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pub DEREF_INTO_DYN_SUPERTRAIT,
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Warn,
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"`Deref` implementation usage with a supertrait trait object for output might be shadowed in the future",
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@future_incompatible = FutureIncompatibleInfo {
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reason: FutureIncompatibilityReason::FutureReleaseSemanticsChange,
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reference: "issue #89460 <https://github.com/rust-lang/rust/issues/89460>",
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};
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"`Deref` implementation usage with a supertrait trait object for output are shadow by implicit coercion",
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}
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declare_lint_pass!(DerefIntoDynSupertrait => [DEREF_INTO_DYN_SUPERTRAIT]);
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@ -90,7 +81,7 @@ impl<'tcx> LateLintPass<'tcx> for DerefIntoDynSupertrait {
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cx.emit_spanned_lint(
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DEREF_INTO_DYN_SUPERTRAIT,
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tcx.def_span(item.owner_id.def_id),
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SupertraitAsDerefTarget { t, target_principal, label },
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SupertraitAsDerefTarget { t, label },
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);
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}
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}
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@ -10,9 +10,7 @@ use rustc_errors::{
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};
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use rustc_hir::def_id::DefId;
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use rustc_macros::{LintDiagnostic, Subdiagnostic};
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use rustc_middle::ty::{
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inhabitedness::InhabitedPredicate, Clause, PolyExistentialTraitRef, Ty, TyCtxt,
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};
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use rustc_middle::ty::{inhabitedness::InhabitedPredicate, Clause, Ty, TyCtxt};
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use rustc_session::parse::ParseSess;
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use rustc_span::{edition::Edition, sym, symbol::Ident, Span, Symbol};
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@ -556,9 +554,9 @@ pub enum BuiltinSpecialModuleNameUsed {
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// deref_into_dyn_supertrait.rs
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#[derive(LintDiagnostic)]
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#[diag(lint_supertrait_as_deref_target)]
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#[help]
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pub struct SupertraitAsDerefTarget<'a> {
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pub t: Ty<'a>,
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pub target_principal: PolyExistentialTraitRef<'a>,
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#[subdiagnostic]
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pub label: Option<SupertraitAsDerefTargetLabel>,
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}
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@ -49,7 +49,7 @@
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#![feature(associated_type_bounds)]
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#![feature(rustc_attrs)]
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#![feature(control_flow_enum)]
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#![feature(trait_upcasting)]
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#![cfg_attr(bootstrap, feature(trait_upcasting))]
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#![feature(trusted_step)]
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#![feature(try_blocks)]
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#![feature(try_reserve_kind)]
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@ -9,13 +9,10 @@
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use hir::def_id::DefId;
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use hir::LangItem;
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use rustc_hir as hir;
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use rustc_infer::traits::ObligationCause;
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use rustc_infer::traits::{Obligation, PolyTraitObligation, SelectionError};
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use rustc_middle::ty::fast_reject::{DeepRejectCtxt, TreatParams};
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use rustc_middle::ty::{self, Ty, TypeVisitableExt};
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use crate::traits;
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use crate::traits::query::evaluate_obligation::InferCtxtExt;
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use crate::traits::util;
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use super::BuiltinImplConditions;
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@ -690,45 +687,6 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
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})
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}
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/// Temporary migration for #89190
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fn need_migrate_deref_output_trait_object(
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&mut self,
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ty: Ty<'tcx>,
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param_env: ty::ParamEnv<'tcx>,
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cause: &ObligationCause<'tcx>,
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) -> Option<ty::PolyExistentialTraitRef<'tcx>> {
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let tcx = self.tcx();
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if tcx.features().trait_upcasting {
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return None;
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}
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// <ty as Deref>
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let trait_ref = ty::TraitRef::new(tcx, tcx.lang_items().deref_trait()?, [ty]);
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let obligation =
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traits::Obligation::new(tcx, cause.clone(), param_env, ty::Binder::dummy(trait_ref));
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if !self.infcx.predicate_may_hold(&obligation) {
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return None;
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}
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self.infcx.probe(|_| {
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let ty = traits::normalize_projection_type(
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self,
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param_env,
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ty::AliasTy::new(tcx, tcx.lang_items().deref_target()?, trait_ref.args),
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cause.clone(),
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0,
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// We're *intentionally* throwing these away,
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// since we don't actually use them.
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&mut vec![],
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)
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.ty()
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.unwrap();
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if let ty::Dynamic(data, ..) = ty.kind() { data.principal() } else { None }
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})
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}
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/// Searches for unsizing that might apply to `obligation`.
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fn assemble_candidates_for_unsizing(
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&mut self,
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@ -786,15 +744,6 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
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let principal_a = a_data.principal().unwrap();
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let target_trait_did = principal_def_id_b.unwrap();
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let source_trait_ref = principal_a.with_self_ty(self.tcx(), source);
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if let Some(deref_trait_ref) = self.need_migrate_deref_output_trait_object(
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source,
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obligation.param_env,
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&obligation.cause,
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) {
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if deref_trait_ref.def_id() == target_trait_did {
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return;
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}
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}
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for (idx, upcast_trait_ref) in
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util::supertraits(self.tcx(), source_trait_ref).enumerate()
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@ -111,7 +111,7 @@
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#![feature(slice_flatten)]
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#![feature(error_generic_member_access)]
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#![feature(error_in_core)]
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#![feature(trait_upcasting)]
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#![cfg_attr(bootstrap, feature(trait_upcasting))]
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#![feature(utf8_chunks)]
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#![feature(is_ascii_octdigit)]
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#![feature(get_many_mut)]
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@ -1,27 +0,0 @@
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# `trait_upcasting`
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|
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The tracking issue for this feature is: [#65991]
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|
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[#65991]: https://github.com/rust-lang/rust/issues/65991
|
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|
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------------------------
|
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|
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The `trait_upcasting` feature adds support for trait upcasting coercion. This allows a
|
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trait object of type `dyn Bar` to be cast to a trait object of type `dyn Foo`
|
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so long as `Bar: Foo`.
|
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|
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```rust,edition2018
|
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#![feature(trait_upcasting)]
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#![allow(incomplete_features)]
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|
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trait Foo {}
|
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|
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trait Bar: Foo {}
|
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|
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impl Foo for i32 {}
|
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|
||||
impl<T: Foo + ?Sized> Bar for T {}
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|
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let bar: &dyn Bar = &123;
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let foo: &dyn Foo = bar;
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```
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@ -11,7 +11,7 @@
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#![feature(round_ties_even)]
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#![feature(let_chains)]
|
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#![feature(lint_reasons)]
|
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#![feature(trait_upcasting)]
|
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#![cfg_attr(bootstrap, feature(trait_upcasting))]
|
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// Configure clippy and other lints
|
||||
#![allow(
|
||||
clippy::collapsible_else_if,
|
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|
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@ -1,6 +1,3 @@
|
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#![feature(trait_upcasting)]
|
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#![allow(incomplete_features)]
|
||||
|
||||
trait Foo: PartialEq<i32> + std::fmt::Debug + Send + Sync {
|
||||
fn a(&self) -> i32 {
|
||||
10
|
||||
|
||||
@ -1,7 +1,6 @@
|
||||
//@revisions: stack tree
|
||||
//@[tree]compile-flags: -Zmiri-tree-borrows
|
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#![allow(incomplete_features)] // for trait upcasting
|
||||
#![feature(allocator_api, trait_upcasting)]
|
||||
#![feature(allocator_api)]
|
||||
|
||||
use std::alloc::Layout;
|
||||
use std::alloc::{AllocError, Allocator};
|
||||
|
||||
@ -1,6 +1,3 @@
|
||||
#![feature(trait_upcasting)]
|
||||
#![allow(incomplete_features)]
|
||||
|
||||
fn main() {
|
||||
basic();
|
||||
diamond();
|
||||
|
||||
@ -1,5 +1,4 @@
|
||||
// build-pass
|
||||
#![feature(trait_upcasting)]
|
||||
|
||||
pub trait A {}
|
||||
pub trait B {}
|
||||
|
||||
@ -1,4 +1,4 @@
|
||||
#![feature(dyn_star, trait_upcasting)]
|
||||
#![feature(dyn_star)]
|
||||
//~^ WARN the feature `dyn_star` is incomplete and may not be safe to use and/or cause compiler crashes
|
||||
|
||||
trait A: B {}
|
||||
|
||||
@ -1,7 +1,7 @@
|
||||
warning: the feature `dyn_star` is incomplete and may not be safe to use and/or cause compiler crashes
|
||||
--> $DIR/no-unsize-coerce-dyn-trait.rs:1:12
|
||||
|
|
||||
LL | #![feature(dyn_star, trait_upcasting)]
|
||||
LL | #![feature(dyn_star)]
|
||||
| ^^^^^^^^
|
||||
|
|
||||
= note: see issue #102425 <https://github.com/rust-lang/rust/issues/102425> for more information
|
||||
|
||||
@ -1,6 +1,6 @@
|
||||
// known-bug: #104800
|
||||
|
||||
#![feature(dyn_star, trait_upcasting)]
|
||||
#![feature(dyn_star)]
|
||||
|
||||
trait Foo: Bar {
|
||||
fn hello(&self);
|
||||
|
||||
@ -1,7 +1,7 @@
|
||||
warning: the feature `dyn_star` is incomplete and may not be safe to use and/or cause compiler crashes
|
||||
--> $DIR/upcast.rs:3:12
|
||||
|
|
||||
LL | #![feature(dyn_star, trait_upcasting)]
|
||||
LL | #![feature(dyn_star)]
|
||||
| ^^^^^^^^
|
||||
|
|
||||
= note: see issue #102425 <https://github.com/rust-lang/rust/issues/102425> for more information
|
||||
|
||||
@ -1,13 +0,0 @@
|
||||
trait Foo {}
|
||||
|
||||
trait Bar: Foo {}
|
||||
|
||||
impl Foo for () {}
|
||||
|
||||
impl Bar for () {}
|
||||
|
||||
fn main() {
|
||||
let bar: &dyn Bar = &();
|
||||
let foo: &dyn Foo = bar;
|
||||
//~^ ERROR trait upcasting coercion is experimental [E0658]
|
||||
}
|
||||
@ -1,13 +0,0 @@
|
||||
error[E0658]: cannot cast `dyn Bar` to `dyn Foo`, trait upcasting coercion is experimental
|
||||
--> $DIR/feature-gate-trait_upcasting.rs:11:25
|
||||
|
|
||||
LL | let foo: &dyn Foo = bar;
|
||||
| ^^^
|
||||
|
|
||||
= note: see issue #65991 <https://github.com/rust-lang/rust/issues/65991> for more information
|
||||
= help: add `#![feature(trait_upcasting)]` to the crate attributes to enable
|
||||
= note: required when coercing `&dyn Bar` into `&dyn Foo`
|
||||
|
||||
error: aborting due to previous error
|
||||
|
||||
For more information about this error, try `rustc --explain E0658`.
|
||||
@ -1,8 +1,6 @@
|
||||
// compile-flags: -Ztrait-solver=next
|
||||
// check-pass
|
||||
|
||||
#![feature(trait_upcasting)]
|
||||
|
||||
trait A {}
|
||||
trait B: A {}
|
||||
|
||||
|
||||
@ -1,8 +1,6 @@
|
||||
// check-pass
|
||||
// compile-flags: -Ztrait-solver=next
|
||||
|
||||
#![feature(trait_upcasting)]
|
||||
|
||||
pub trait A {}
|
||||
pub trait B: A {}
|
||||
|
||||
|
||||
@ -1,8 +1,6 @@
|
||||
// compile-flags: -Ztrait-solver=next
|
||||
// check-pass
|
||||
|
||||
#![feature(trait_upcasting)]
|
||||
|
||||
trait Foo: Bar<i32> + Bar<u32> {}
|
||||
|
||||
trait Bar<T> {}
|
||||
|
||||
@ -1,7 +1,5 @@
|
||||
// compile-flags: -Ztrait-solver=next
|
||||
|
||||
#![feature(trait_upcasting)]
|
||||
|
||||
trait Foo: Bar<i32> + Bar<u32> {}
|
||||
|
||||
trait Bar<T> {}
|
||||
|
||||
@ -1,5 +1,5 @@
|
||||
error[E0308]: mismatched types
|
||||
--> $DIR/upcast-wrong-substs.rs:11:30
|
||||
--> $DIR/upcast-wrong-substs.rs:9:30
|
||||
|
|
||||
LL | let y: &dyn Bar<usize> = x;
|
||||
| --------------- ^ expected trait `Bar`, found trait `Foo`
|
||||
|
||||
@ -1,4 +1,3 @@
|
||||
#![feature(trait_upcasting)]
|
||||
#![feature(trait_alias)]
|
||||
|
||||
// Although we *elaborate* `T: Alias` to `i32: B`, we should
|
||||
|
||||
@ -1,5 +1,5 @@
|
||||
error[E0308]: mismatched types
|
||||
--> $DIR/alias-where-clause-isnt-supertrait.rs:27:5
|
||||
--> $DIR/alias-where-clause-isnt-supertrait.rs:26:5
|
||||
|
|
||||
LL | fn test(x: &dyn C) -> &dyn B {
|
||||
| ------ expected `&dyn B` because of return type
|
||||
|
||||
@ -1,7 +1,5 @@
|
||||
// run-pass
|
||||
|
||||
#![feature(trait_upcasting)]
|
||||
|
||||
trait Foo: PartialEq<i32> + std::fmt::Debug + Send + Sync {
|
||||
fn a(&self) -> i32 {
|
||||
10
|
||||
|
||||
@ -1,5 +1,4 @@
|
||||
// run-pass
|
||||
#![feature(trait_upcasting)]
|
||||
|
||||
trait Foo<T: Default + ToString>: Bar<i32> + Bar<T> {}
|
||||
trait Bar<T: Default + ToString> {
|
||||
|
||||
@ -1,4 +1,4 @@
|
||||
#![deny(deref_into_dyn_supertrait)]
|
||||
// check-pass
|
||||
|
||||
use std::ops::Deref;
|
||||
|
||||
@ -6,8 +6,7 @@ trait Bar<'a> {}
|
||||
trait Foo<'a>: Bar<'a> {}
|
||||
|
||||
impl<'a> Deref for dyn Foo<'a> {
|
||||
//~^ ERROR dyn Foo<'_>` implements `Deref` with supertrait `Bar<'_>` as target
|
||||
//~| WARN this will change its meaning in a future release!
|
||||
//~^ WARN this `Deref` implementation is covered by an implicit supertrait coercion
|
||||
type Target = dyn Bar<'a>;
|
||||
|
||||
fn deref(&self) -> &Self::Target {
|
||||
14
tests/ui/traits/trait-upcasting/deref-lint-regions.stderr
Normal file
14
tests/ui/traits/trait-upcasting/deref-lint-regions.stderr
Normal file
@ -0,0 +1,14 @@
|
||||
warning: this `Deref` implementation is covered by an implicit supertrait coercion
|
||||
--> $DIR/deref-lint-regions.rs:8:1
|
||||
|
|
||||
LL | impl<'a> Deref for dyn Foo<'a> {
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
LL |
|
||||
LL | type Target = dyn Bar<'a>;
|
||||
| -------------------------- target type is a supertrait of `dyn Foo<'_>`
|
||||
|
|
||||
= help: consider removing this implementation or replacing it with a method instead
|
||||
= note: `#[warn(deref_into_dyn_supertrait)]` on by default
|
||||
|
||||
warning: 1 warning emitted
|
||||
|
||||
@ -1,4 +1,4 @@
|
||||
#![deny(deref_into_dyn_supertrait)]
|
||||
// check-pass
|
||||
|
||||
use std::ops::Deref;
|
||||
|
||||
@ -7,9 +7,7 @@ trait A {}
|
||||
trait B: A {}
|
||||
|
||||
impl<'a> Deref for dyn 'a + B {
|
||||
//~^ ERROR `dyn B` implements `Deref` with supertrait `A` as target
|
||||
//~| WARN this will change its meaning in a future release!
|
||||
|
||||
//~^ WARN this `Deref` implementation is covered by an implicit supertrait coercion
|
||||
type Target = dyn A;
|
||||
fn deref(&self) -> &Self::Target {
|
||||
todo!()
|
||||
14
tests/ui/traits/trait-upcasting/deref-lint.stderr
Normal file
14
tests/ui/traits/trait-upcasting/deref-lint.stderr
Normal file
@ -0,0 +1,14 @@
|
||||
warning: this `Deref` implementation is covered by an implicit supertrait coercion
|
||||
--> $DIR/deref-lint.rs:9:1
|
||||
|
|
||||
LL | impl<'a> Deref for dyn 'a + B {
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
LL |
|
||||
LL | type Target = dyn A;
|
||||
| -------------------- target type is a supertrait of `dyn B`
|
||||
|
|
||||
= help: consider removing this implementation or replacing it with a method instead
|
||||
= note: `#[warn(deref_into_dyn_supertrait)]` on by default
|
||||
|
||||
warning: 1 warning emitted
|
||||
|
||||
@ -1,7 +1,5 @@
|
||||
// run-pass
|
||||
|
||||
#![feature(trait_upcasting)]
|
||||
|
||||
trait Foo: PartialEq<i32> + std::fmt::Debug + Send + Sync {
|
||||
fn a(&self) -> i32 {
|
||||
10
|
||||
|
||||
@ -3,8 +3,6 @@
|
||||
// revisions: current next
|
||||
//[next] compile-flags: -Ztrait-solver=next
|
||||
|
||||
#![feature(trait_upcasting)]
|
||||
|
||||
trait A: B {
|
||||
type Assoc;
|
||||
}
|
||||
|
||||
@ -1,5 +1,5 @@
|
||||
error[E0308]: mismatched types
|
||||
--> $DIR/illegal-upcast-from-impl.rs:16:66
|
||||
--> $DIR/illegal-upcast-from-impl.rs:14:66
|
||||
|
|
||||
LL | fn illegal(x: &dyn Sub<Assoc = ()>) -> &dyn Super<Assoc = i32> { x }
|
||||
| ----------------------- ^ expected trait `Super`, found trait `Sub`
|
||||
|
||||
@ -1,5 +1,5 @@
|
||||
error[E0308]: mismatched types
|
||||
--> $DIR/illegal-upcast-from-impl.rs:16:66
|
||||
--> $DIR/illegal-upcast-from-impl.rs:14:66
|
||||
|
|
||||
LL | fn illegal(x: &dyn Sub<Assoc = ()>) -> &dyn Super<Assoc = i32> { x }
|
||||
| ----------------------- ^ expected trait `Super`, found trait `Sub`
|
||||
|
||||
@ -1,8 +1,6 @@
|
||||
// revisions: current next
|
||||
//[next] compile-flags: -Ztrait-solver=next
|
||||
|
||||
#![feature(trait_upcasting)]
|
||||
|
||||
trait Super {
|
||||
type Assoc;
|
||||
}
|
||||
|
||||
@ -1,5 +1,4 @@
|
||||
#![deny(deref_into_dyn_supertrait)]
|
||||
#![feature(trait_upcasting)] // remove this and the test compiles
|
||||
|
||||
use std::ops::Deref;
|
||||
|
||||
|
||||
@ -1,5 +1,5 @@
|
||||
error[E0308]: mismatched types
|
||||
--> $DIR/inference-behavior-change-deref.rs:34:18
|
||||
--> $DIR/inference-behavior-change-deref.rs:33:18
|
||||
|
|
||||
LL | let z: u32 = y;
|
||||
| --- ^ expected `u32`, found `i32`
|
||||
|
||||
@ -1,5 +1,3 @@
|
||||
#![feature(trait_upcasting)]
|
||||
|
||||
trait Foo {
|
||||
fn a(&self) -> i32 {
|
||||
10
|
||||
|
||||
@ -1,5 +1,5 @@
|
||||
error[E0308]: mismatched types
|
||||
--> $DIR/invalid-upcast.rs:53:35
|
||||
--> $DIR/invalid-upcast.rs:51:35
|
||||
|
|
||||
LL | let _: &dyn std::fmt::Debug = baz;
|
||||
| -------------------- ^^^ expected trait `Debug`, found trait `Baz`
|
||||
@ -10,7 +10,7 @@ LL | let _: &dyn std::fmt::Debug = baz;
|
||||
found reference `&dyn Baz`
|
||||
|
||||
error[E0308]: mismatched types
|
||||
--> $DIR/invalid-upcast.rs:55:24
|
||||
--> $DIR/invalid-upcast.rs:53:24
|
||||
|
|
||||
LL | let _: &dyn Send = baz;
|
||||
| --------- ^^^ expected trait `Send`, found trait `Baz`
|
||||
@ -21,7 +21,7 @@ LL | let _: &dyn Send = baz;
|
||||
found reference `&dyn Baz`
|
||||
|
||||
error[E0308]: mismatched types
|
||||
--> $DIR/invalid-upcast.rs:57:24
|
||||
--> $DIR/invalid-upcast.rs:55:24
|
||||
|
|
||||
LL | let _: &dyn Sync = baz;
|
||||
| --------- ^^^ expected trait `Sync`, found trait `Baz`
|
||||
@ -32,7 +32,7 @@ LL | let _: &dyn Sync = baz;
|
||||
found reference `&dyn Baz`
|
||||
|
||||
error[E0308]: mismatched types
|
||||
--> $DIR/invalid-upcast.rs:60:25
|
||||
--> $DIR/invalid-upcast.rs:58:25
|
||||
|
|
||||
LL | let bar: &dyn Bar = baz;
|
||||
| -------- ^^^ expected trait `Bar`, found trait `Baz`
|
||||
@ -43,7 +43,7 @@ LL | let bar: &dyn Bar = baz;
|
||||
found reference `&dyn Baz`
|
||||
|
||||
error[E0308]: mismatched types
|
||||
--> $DIR/invalid-upcast.rs:62:35
|
||||
--> $DIR/invalid-upcast.rs:60:35
|
||||
|
|
||||
LL | let _: &dyn std::fmt::Debug = bar;
|
||||
| -------------------- ^^^ expected trait `Debug`, found trait `Bar`
|
||||
@ -54,7 +54,7 @@ LL | let _: &dyn std::fmt::Debug = bar;
|
||||
found reference `&dyn Bar`
|
||||
|
||||
error[E0308]: mismatched types
|
||||
--> $DIR/invalid-upcast.rs:64:24
|
||||
--> $DIR/invalid-upcast.rs:62:24
|
||||
|
|
||||
LL | let _: &dyn Send = bar;
|
||||
| --------- ^^^ expected trait `Send`, found trait `Bar`
|
||||
@ -65,7 +65,7 @@ LL | let _: &dyn Send = bar;
|
||||
found reference `&dyn Bar`
|
||||
|
||||
error[E0308]: mismatched types
|
||||
--> $DIR/invalid-upcast.rs:66:24
|
||||
--> $DIR/invalid-upcast.rs:64:24
|
||||
|
|
||||
LL | let _: &dyn Sync = bar;
|
||||
| --------- ^^^ expected trait `Sync`, found trait `Bar`
|
||||
@ -76,7 +76,7 @@ LL | let _: &dyn Sync = bar;
|
||||
found reference `&dyn Bar`
|
||||
|
||||
error[E0308]: mismatched types
|
||||
--> $DIR/invalid-upcast.rs:69:25
|
||||
--> $DIR/invalid-upcast.rs:67:25
|
||||
|
|
||||
LL | let foo: &dyn Foo = baz;
|
||||
| -------- ^^^ expected trait `Foo`, found trait `Baz`
|
||||
@ -87,7 +87,7 @@ LL | let foo: &dyn Foo = baz;
|
||||
found reference `&dyn Baz`
|
||||
|
||||
error[E0308]: mismatched types
|
||||
--> $DIR/invalid-upcast.rs:71:35
|
||||
--> $DIR/invalid-upcast.rs:69:35
|
||||
|
|
||||
LL | let _: &dyn std::fmt::Debug = foo;
|
||||
| -------------------- ^^^ expected trait `Debug`, found trait `Foo`
|
||||
@ -98,7 +98,7 @@ LL | let _: &dyn std::fmt::Debug = foo;
|
||||
found reference `&dyn Foo`
|
||||
|
||||
error[E0308]: mismatched types
|
||||
--> $DIR/invalid-upcast.rs:73:24
|
||||
--> $DIR/invalid-upcast.rs:71:24
|
||||
|
|
||||
LL | let _: &dyn Send = foo;
|
||||
| --------- ^^^ expected trait `Send`, found trait `Foo`
|
||||
@ -109,7 +109,7 @@ LL | let _: &dyn Send = foo;
|
||||
found reference `&dyn Foo`
|
||||
|
||||
error[E0308]: mismatched types
|
||||
--> $DIR/invalid-upcast.rs:75:24
|
||||
--> $DIR/invalid-upcast.rs:73:24
|
||||
|
|
||||
LL | let _: &dyn Sync = foo;
|
||||
| --------- ^^^ expected trait `Sync`, found trait `Foo`
|
||||
@ -120,7 +120,7 @@ LL | let _: &dyn Sync = foo;
|
||||
found reference `&dyn Foo`
|
||||
|
||||
error[E0308]: mismatched types
|
||||
--> $DIR/invalid-upcast.rs:78:25
|
||||
--> $DIR/invalid-upcast.rs:76:25
|
||||
|
|
||||
LL | let foo: &dyn Foo = bar;
|
||||
| -------- ^^^ expected trait `Foo`, found trait `Bar`
|
||||
@ -131,7 +131,7 @@ LL | let foo: &dyn Foo = bar;
|
||||
found reference `&dyn Bar`
|
||||
|
||||
error[E0308]: mismatched types
|
||||
--> $DIR/invalid-upcast.rs:80:35
|
||||
--> $DIR/invalid-upcast.rs:78:35
|
||||
|
|
||||
LL | let _: &dyn std::fmt::Debug = foo;
|
||||
| -------------------- ^^^ expected trait `Debug`, found trait `Foo`
|
||||
@ -142,7 +142,7 @@ LL | let _: &dyn std::fmt::Debug = foo;
|
||||
found reference `&dyn Foo`
|
||||
|
||||
error[E0308]: mismatched types
|
||||
--> $DIR/invalid-upcast.rs:82:24
|
||||
--> $DIR/invalid-upcast.rs:80:24
|
||||
|
|
||||
LL | let _: &dyn Send = foo;
|
||||
| --------- ^^^ expected trait `Send`, found trait `Foo`
|
||||
@ -153,7 +153,7 @@ LL | let _: &dyn Send = foo;
|
||||
found reference `&dyn Foo`
|
||||
|
||||
error[E0308]: mismatched types
|
||||
--> $DIR/invalid-upcast.rs:84:24
|
||||
--> $DIR/invalid-upcast.rs:82:24
|
||||
|
|
||||
LL | let _: &dyn Sync = foo;
|
||||
| --------- ^^^ expected trait `Sync`, found trait `Foo`
|
||||
|
||||
@ -1,5 +1,4 @@
|
||||
// run-pass
|
||||
#![feature(trait_upcasting)]
|
||||
|
||||
struct Test {
|
||||
func: Box<dyn FnMut() + 'static>,
|
||||
|
||||
@ -1,13 +0,0 @@
|
||||
error[E0658]: cannot cast `dyn Fn()` to `dyn FnMut()`, trait upcasting coercion is experimental
|
||||
--> $DIR/issue-11515.rs:10:38
|
||||
|
|
||||
LL | let test = Box::new(Test { func: closure });
|
||||
| ^^^^^^^
|
||||
|
|
||||
= note: see issue #65991 <https://github.com/rust-lang/rust/issues/65991> for more information
|
||||
= help: add `#![feature(trait_upcasting)]` to the crate attributes to enable
|
||||
= note: required when coercing `Box<(dyn Fn() + 'static)>` into `Box<(dyn FnMut() + 'static)>`
|
||||
|
||||
error: aborting due to previous error
|
||||
|
||||
For more information about this error, try `rustc --explain E0658`.
|
||||
@ -1,13 +0,0 @@
|
||||
error[E0658]: cannot cast `dyn Fn()` to `dyn FnMut()`, trait upcasting coercion is experimental
|
||||
--> $DIR/issue-11515.rs:10:38
|
||||
|
|
||||
LL | let test = Box::new(Test { func: closure });
|
||||
| ^^^^^^^
|
||||
|
|
||||
= note: see issue #65991 <https://github.com/rust-lang/rust/issues/65991> for more information
|
||||
= help: add `#![feature(trait_upcasting)]` to the crate attributes to enable
|
||||
= note: required when coercing `Box<(dyn Fn() + 'static)>` into `Box<(dyn FnMut() + 'static)>`
|
||||
|
||||
error: aborting due to previous error
|
||||
|
||||
For more information about this error, try `rustc --explain E0658`.
|
||||
@ -1,3 +1,4 @@
|
||||
// check-pass
|
||||
// revisions: current next
|
||||
//[next] compile-flags: -Ztrait-solver=next
|
||||
|
||||
@ -7,5 +8,5 @@ struct Test {
|
||||
|
||||
fn main() {
|
||||
let closure: Box<dyn Fn() + 'static> = Box::new(|| ());
|
||||
let test = Box::new(Test { func: closure }); //~ ERROR trait upcasting coercion is experimental [E0658]
|
||||
let test = Box::new(Test { func: closure });
|
||||
}
|
||||
|
||||
@ -1,7 +1,5 @@
|
||||
// run-pass
|
||||
|
||||
#![feature(trait_upcasting)]
|
||||
|
||||
trait Foo: PartialEq<i32> + std::fmt::Debug + Send + Sync {
|
||||
fn a(&self) -> i32 {
|
||||
10
|
||||
|
||||
@ -1,19 +0,0 @@
|
||||
error: `dyn Foo<'_>` implements `Deref` with supertrait `Bar<'_>` as target
|
||||
--> $DIR/migrate-lint-deny-regions.rs:8:1
|
||||
|
|
||||
LL | impl<'a> Deref for dyn Foo<'a> {
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
...
|
||||
LL | type Target = dyn Bar<'a>;
|
||||
| -------------------------- target type is set here
|
||||
|
|
||||
= warning: this will change its meaning in a future release!
|
||||
= note: for more information, see issue #89460 <https://github.com/rust-lang/rust/issues/89460>
|
||||
note: the lint level is defined here
|
||||
--> $DIR/migrate-lint-deny-regions.rs:1:9
|
||||
|
|
||||
LL | #![deny(deref_into_dyn_supertrait)]
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
|
||||
error: aborting due to previous error
|
||||
|
||||
@ -1,19 +0,0 @@
|
||||
error: `dyn B` implements `Deref` with supertrait `A` as target
|
||||
--> $DIR/migrate-lint-deny.rs:9:1
|
||||
|
|
||||
LL | impl<'a> Deref for dyn 'a + B {
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
...
|
||||
LL | type Target = dyn A;
|
||||
| -------------------- target type is set here
|
||||
|
|
||||
= warning: this will change its meaning in a future release!
|
||||
= note: for more information, see issue #89460 <https://github.com/rust-lang/rust/issues/89460>
|
||||
note: the lint level is defined here
|
||||
--> $DIR/migrate-lint-deny.rs:1:9
|
||||
|
|
||||
LL | #![deny(deref_into_dyn_supertrait)]
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
|
||||
error: aborting due to previous error
|
||||
|
||||
@ -1,5 +1,4 @@
|
||||
// check-fail
|
||||
#![feature(trait_upcasting)]
|
||||
|
||||
trait Bar<T> {
|
||||
fn bar(&self, _: T) {}
|
||||
|
||||
@ -1,5 +1,5 @@
|
||||
error[E0308]: mismatched types
|
||||
--> $DIR/multiple-occurrence-ambiguousity.rs:20:26
|
||||
--> $DIR/multiple-occurrence-ambiguousity.rs:19:26
|
||||
|
|
||||
LL | let t: &dyn Bar<_> = s;
|
||||
| ----------- ^ expected trait `Bar`, found trait `Foo`
|
||||
|
||||
@ -3,8 +3,6 @@
|
||||
// revisions: current next
|
||||
//[next] compile-flags: -Ztrait-solver=next
|
||||
|
||||
#![feature(trait_upcasting)]
|
||||
|
||||
trait Mirror {
|
||||
type Assoc;
|
||||
}
|
||||
|
||||
@ -1,7 +1,5 @@
|
||||
// run-pass
|
||||
|
||||
#![feature(trait_upcasting)]
|
||||
|
||||
trait A {
|
||||
fn foo_a(&self);
|
||||
}
|
||||
|
||||
@ -1,7 +1,5 @@
|
||||
// run-pass
|
||||
|
||||
#![feature(trait_upcasting)]
|
||||
|
||||
use std::rc::Rc;
|
||||
use std::sync::Arc;
|
||||
|
||||
|
||||
@ -1,5 +1,3 @@
|
||||
#![feature(trait_upcasting)]
|
||||
|
||||
trait Foo: PartialEq<i32> + std::fmt::Debug + Send + Sync {
|
||||
fn a(&self) -> i32 {
|
||||
10
|
||||
|
||||
@ -1,64 +1,64 @@
|
||||
error[E0599]: no method named `c` found for reference `&dyn Bar` in the current scope
|
||||
--> $DIR/subtrait-method.rs:55:9
|
||||
--> $DIR/subtrait-method.rs:53:9
|
||||
|
|
||||
LL | bar.c();
|
||||
| ^ help: there is a method with a similar name: `a`
|
||||
|
|
||||
= help: items from traits can only be used if the trait is implemented and in scope
|
||||
note: `Baz` defines an item `c`, perhaps you need to implement it
|
||||
--> $DIR/subtrait-method.rs:27:1
|
||||
--> $DIR/subtrait-method.rs:25:1
|
||||
|
|
||||
LL | trait Baz: Bar {
|
||||
| ^^^^^^^^^^^^^^
|
||||
|
||||
error[E0599]: no method named `b` found for reference `&dyn Foo` in the current scope
|
||||
--> $DIR/subtrait-method.rs:57:9
|
||||
|
|
||||
LL | foo.b();
|
||||
| ^ help: there is a method with a similar name: `a`
|
||||
|
|
||||
= help: items from traits can only be used if the trait is implemented and in scope
|
||||
note: `Bar` defines an item `b`, perhaps you need to implement it
|
||||
--> $DIR/subtrait-method.rs:15:1
|
||||
|
|
||||
LL | trait Bar: Foo {
|
||||
| ^^^^^^^^^^^^^^
|
||||
|
||||
error[E0599]: no method named `c` found for reference `&dyn Foo` in the current scope
|
||||
--> $DIR/subtrait-method.rs:59:9
|
||||
|
|
||||
LL | foo.b();
|
||||
| ^ help: there is a method with a similar name: `a`
|
||||
|
|
||||
= help: items from traits can only be used if the trait is implemented and in scope
|
||||
note: `Bar` defines an item `b`, perhaps you need to implement it
|
||||
--> $DIR/subtrait-method.rs:17:1
|
||||
|
|
||||
LL | trait Bar: Foo {
|
||||
| ^^^^^^^^^^^^^^
|
||||
|
||||
error[E0599]: no method named `c` found for reference `&dyn Foo` in the current scope
|
||||
--> $DIR/subtrait-method.rs:61:9
|
||||
|
|
||||
LL | foo.c();
|
||||
| ^ help: there is a method with a similar name: `a`
|
||||
|
|
||||
= help: items from traits can only be used if the trait is implemented and in scope
|
||||
note: `Baz` defines an item `c`, perhaps you need to implement it
|
||||
--> $DIR/subtrait-method.rs:27:1
|
||||
--> $DIR/subtrait-method.rs:25:1
|
||||
|
|
||||
LL | trait Baz: Bar {
|
||||
| ^^^^^^^^^^^^^^
|
||||
|
||||
error[E0599]: no method named `b` found for reference `&dyn Foo` in the current scope
|
||||
--> $DIR/subtrait-method.rs:65:9
|
||||
--> $DIR/subtrait-method.rs:63:9
|
||||
|
|
||||
LL | foo.b();
|
||||
| ^ help: there is a method with a similar name: `a`
|
||||
|
|
||||
= help: items from traits can only be used if the trait is implemented and in scope
|
||||
note: `Bar` defines an item `b`, perhaps you need to implement it
|
||||
--> $DIR/subtrait-method.rs:17:1
|
||||
--> $DIR/subtrait-method.rs:15:1
|
||||
|
|
||||
LL | trait Bar: Foo {
|
||||
| ^^^^^^^^^^^^^^
|
||||
|
||||
error[E0599]: no method named `c` found for reference `&dyn Foo` in the current scope
|
||||
--> $DIR/subtrait-method.rs:67:9
|
||||
--> $DIR/subtrait-method.rs:65:9
|
||||
|
|
||||
LL | foo.c();
|
||||
| ^ help: there is a method with a similar name: `a`
|
||||
|
|
||||
= help: items from traits can only be used if the trait is implemented and in scope
|
||||
note: `Baz` defines an item `c`, perhaps you need to implement it
|
||||
--> $DIR/subtrait-method.rs:27:1
|
||||
--> $DIR/subtrait-method.rs:25:1
|
||||
|
|
||||
LL | trait Baz: Bar {
|
||||
| ^^^^^^^^^^^^^^
|
||||
|
||||
@ -1,5 +1,5 @@
|
||||
error[E0605]: non-primitive cast: `&dyn Foo` as `&dyn Bar<_>`
|
||||
--> $DIR/type-checking-test-1.rs:19:13
|
||||
--> $DIR/type-checking-test-1.rs:17:13
|
||||
|
|
||||
LL | let _ = x as &dyn Bar<_>; // Ambiguous
|
||||
| ^^^^^^^^^^^^^^^^ an `as` expression can only be used to convert between primitive types or to coerce to a specific trait object
|
||||
|
||||
@ -1,5 +1,5 @@
|
||||
error[E0605]: non-primitive cast: `&dyn Foo` as `&dyn Bar<_>`
|
||||
--> $DIR/type-checking-test-1.rs:19:13
|
||||
--> $DIR/type-checking-test-1.rs:17:13
|
||||
|
|
||||
LL | let _ = x as &dyn Bar<_>; // Ambiguous
|
||||
| ^^^^^^^^^^^^^^^^ an `as` expression can only be used to convert between primitive types or to coerce to a specific trait object
|
||||
|
||||
@ -1,8 +1,6 @@
|
||||
// revisions: current next
|
||||
//[next] compile-flags: -Ztrait-solver=next
|
||||
|
||||
#![feature(trait_upcasting)]
|
||||
|
||||
trait Foo: Bar<i32> + Bar<u32> {}
|
||||
trait Bar<T> {
|
||||
fn bar(&self) -> Option<T> {
|
||||
|
||||
@ -1,5 +1,3 @@
|
||||
#![feature(trait_upcasting)]
|
||||
|
||||
trait Foo<T>: Bar<i32> + Bar<T> {}
|
||||
trait Bar<T> {
|
||||
fn bar(&self) -> Option<T> {
|
||||
|
||||
@ -1,11 +1,11 @@
|
||||
error[E0605]: non-primitive cast: `&dyn Foo<i32>` as `&dyn Bar<u32>`
|
||||
--> $DIR/type-checking-test-2.rs:19:13
|
||||
--> $DIR/type-checking-test-2.rs:17:13
|
||||
|
|
||||
LL | let _ = x as &dyn Bar<u32>; // Error
|
||||
| ^^^^^^^^^^^^^^^^^^ an `as` expression can only be used to convert between primitive types or to coerce to a specific trait object
|
||||
|
||||
error[E0605]: non-primitive cast: `&dyn Foo<u32>` as `&dyn Bar<_>`
|
||||
--> $DIR/type-checking-test-2.rs:24:13
|
||||
--> $DIR/type-checking-test-2.rs:22:13
|
||||
|
|
||||
LL | let a = x as &dyn Bar<_>; // Ambiguous
|
||||
| ^^^^^^^^^^^^^^^^ an `as` expression can only be used to convert between primitive types or to coerce to a specific trait object
|
||||
|
||||
@ -1,5 +1,3 @@
|
||||
#![feature(trait_upcasting)]
|
||||
|
||||
trait Foo<'a>: Bar<'a> {}
|
||||
trait Bar<'a> {}
|
||||
|
||||
|
||||
@ -1,5 +1,5 @@
|
||||
error: lifetime may not live long enough
|
||||
--> $DIR/type-checking-test-3.rs:11:13
|
||||
--> $DIR/type-checking-test-3.rs:9:13
|
||||
|
|
||||
LL | fn test_wrong1<'a>(x: &dyn Foo<'static>, y: &'a u32) {
|
||||
| -- lifetime `'a` defined here
|
||||
@ -7,7 +7,7 @@ LL | let _ = x as &dyn Bar<'a>; // Error
|
||||
| ^^^^^^^^^^^^^^^^^ type annotation requires that `'a` must outlive `'static`
|
||||
|
||||
error: lifetime may not live long enough
|
||||
--> $DIR/type-checking-test-3.rs:16:13
|
||||
--> $DIR/type-checking-test-3.rs:14:13
|
||||
|
|
||||
LL | fn test_wrong2<'a>(x: &dyn Foo<'a>) {
|
||||
| -- lifetime `'a` defined here
|
||||
|
||||
@ -1,5 +1,3 @@
|
||||
#![feature(trait_upcasting)]
|
||||
|
||||
trait Foo<'a>: Bar<'a, 'a> {}
|
||||
trait Bar<'a, 'b> {
|
||||
fn get_b(&self) -> Option<&'a u32> {
|
||||
|
||||
@ -1,5 +1,5 @@
|
||||
error: lifetime may not live long enough
|
||||
--> $DIR/type-checking-test-4.rs:15:13
|
||||
--> $DIR/type-checking-test-4.rs:13:13
|
||||
|
|
||||
LL | fn test_wrong1<'a>(x: &dyn Foo<'static>, y: &'a u32) {
|
||||
| -- lifetime `'a` defined here
|
||||
@ -7,7 +7,7 @@ LL | let _ = x as &dyn Bar<'static, 'a>; // Error
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ type annotation requires that `'a` must outlive `'static`
|
||||
|
||||
error: lifetime may not live long enough
|
||||
--> $DIR/type-checking-test-4.rs:20:13
|
||||
--> $DIR/type-checking-test-4.rs:18:13
|
||||
|
|
||||
LL | fn test_wrong2<'a>(x: &dyn Foo<'static>, y: &'a u32) {
|
||||
| -- lifetime `'a` defined here
|
||||
@ -15,7 +15,7 @@ LL | let _ = x as &dyn Bar<'a, 'static>; // Error
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ type annotation requires that `'a` must outlive `'static`
|
||||
|
||||
error: lifetime may not live long enough
|
||||
--> $DIR/type-checking-test-4.rs:26:5
|
||||
--> $DIR/type-checking-test-4.rs:24:5
|
||||
|
|
||||
LL | fn test_wrong3<'a>(x: &dyn Foo<'a>) -> Option<&'static u32> {
|
||||
| -- lifetime `'a` defined here
|
||||
@ -24,7 +24,7 @@ LL | y.get_b() // ERROR
|
||||
| ^^^^^^^^^ returning this value requires that `'a` must outlive `'static`
|
||||
|
||||
error: lifetime may not live long enough
|
||||
--> $DIR/type-checking-test-4.rs:31:5
|
||||
--> $DIR/type-checking-test-4.rs:29:5
|
||||
|
|
||||
LL | fn test_wrong4<'a>(x: &dyn Foo<'a>) -> Option<&'static u32> {
|
||||
| -- lifetime `'a` defined here
|
||||
@ -32,7 +32,7 @@ LL | <_ as Bar>::get_b(x) // ERROR
|
||||
| ^^^^^^^^^^^^^^^^^^^^ returning this value requires that `'a` must outlive `'static`
|
||||
|
||||
error: lifetime may not live long enough
|
||||
--> $DIR/type-checking-test-4.rs:36:5
|
||||
--> $DIR/type-checking-test-4.rs:34:5
|
||||
|
|
||||
LL | fn test_wrong5<'a>(x: &dyn Foo<'a>) -> Option<&'static u32> {
|
||||
| -- lifetime `'a` defined here
|
||||
@ -40,7 +40,7 @@ LL | <_ as Bar<'_, '_>>::get_b(x) // ERROR
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ returning this value requires that `'a` must outlive `'static`
|
||||
|
||||
error: lifetime may not live long enough
|
||||
--> $DIR/type-checking-test-4.rs:44:5
|
||||
--> $DIR/type-checking-test-4.rs:42:5
|
||||
|
|
||||
LL | fn test_wrong6<'a>(x: &dyn Foo<'a>) -> Option<&'static u32> {
|
||||
| -- lifetime `'a` defined here
|
||||
|
||||
@ -1,13 +0,0 @@
|
||||
error[E0658]: cannot cast `dyn A` to `dyn B`, trait upcasting coercion is experimental
|
||||
--> $DIR/upcast-through-struct-tail.rs:10:5
|
||||
|
|
||||
LL | x
|
||||
| ^
|
||||
|
|
||||
= note: see issue #65991 <https://github.com/rust-lang/rust/issues/65991> for more information
|
||||
= help: add `#![feature(trait_upcasting)]` to the crate attributes to enable
|
||||
= note: required when coercing `Box<Wrapper<(dyn A + 'a)>>` into `Box<Wrapper<(dyn B + 'a)>>`
|
||||
|
||||
error: aborting due to previous error
|
||||
|
||||
For more information about this error, try `rustc --explain E0658`.
|
||||
@ -1,13 +0,0 @@
|
||||
error[E0658]: cannot cast `dyn A` to `dyn B`, trait upcasting coercion is experimental
|
||||
--> $DIR/upcast-through-struct-tail.rs:10:5
|
||||
|
|
||||
LL | x
|
||||
| ^
|
||||
|
|
||||
= note: see issue #65991 <https://github.com/rust-lang/rust/issues/65991> for more information
|
||||
= help: add `#![feature(trait_upcasting)]` to the crate attributes to enable
|
||||
= note: required when coercing `Box<Wrapper<(dyn A + 'a)>>` into `Box<Wrapper<(dyn B + 'a)>>`
|
||||
|
||||
error: aborting due to previous error
|
||||
|
||||
For more information about this error, try `rustc --explain E0658`.
|
||||
@ -1,3 +1,4 @@
|
||||
// check-pass
|
||||
// revisions: current next
|
||||
//[next] compile-flags: -Ztrait-solver=next
|
||||
|
||||
@ -8,7 +9,6 @@ trait B {}
|
||||
|
||||
fn test<'a>(x: Box<Wrapper<dyn A + 'a>>) -> Box<Wrapper<dyn B + 'a>> {
|
||||
x
|
||||
//~^ ERROR cannot cast `dyn A` to `dyn B`, trait upcasting coercion is experimental
|
||||
}
|
||||
|
||||
fn main() {}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user