diff options
Diffstat (limited to 'compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs')
| -rw-r--r-- | compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs | 242 |
1 files changed, 110 insertions, 132 deletions
diff --git a/compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs b/compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs index 8c41d9d24..6ea54b625 100644 --- a/compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs +++ b/compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs @@ -1,11 +1,8 @@ -use super::{ - DefIdOrName, Obligation, ObligationCause, ObligationCauseCode, PredicateObligation, - SelectionContext, -}; +use super::{DefIdOrName, Obligation, ObligationCause, ObligationCauseCode, PredicateObligation}; use crate::autoderef::Autoderef; use crate::infer::InferCtxt; -use crate::traits::normalize_to; +use crate::traits::NormalizeExt; use hir::def::CtorOf; use hir::HirId; @@ -23,7 +20,7 @@ use rustc_hir::lang_items::LangItem; use rustc_hir::{AsyncGeneratorKind, GeneratorKind, Node}; use rustc_infer::infer::error_reporting::TypeErrCtxt; use rustc_infer::infer::type_variable::{TypeVariableOrigin, TypeVariableOriginKind}; -use rustc_infer::infer::LateBoundRegionConversionTime; +use rustc_infer::infer::{InferOk, LateBoundRegionConversionTime}; use rustc_middle::hir::map; use rustc_middle::ty::{ self, suggest_arbitrary_trait_bound, suggest_constraining_type_param, AdtKind, DefIdTree, @@ -44,7 +41,7 @@ use rustc_middle::ty::print::with_no_trimmed_paths; #[derive(Debug)] pub enum GeneratorInteriorOrUpvar { // span of interior type - Interior(Span), + Interior(Span, Option<(Option<Span>, Span, Option<hir::HirId>, Option<Span>)>), // span of upvar Upvar(Span), } @@ -283,7 +280,6 @@ pub trait TypeErrCtxtExt<'tcx> { &self, err: &mut Diagnostic, interior_or_upvar_span: GeneratorInteriorOrUpvar, - interior_extra_info: Option<(Option<Span>, Span, Option<hir::HirId>, Option<Span>)>, is_async: bool, outer_generator: Option<DefId>, trait_pred: ty::TraitPredicate<'tcx>, @@ -302,7 +298,7 @@ pub trait TypeErrCtxtExt<'tcx> { obligated_types: &mut Vec<Ty<'tcx>>, seen_requirements: &mut FxHashSet<DefId>, ) where - T: fmt::Display; + T: fmt::Display + ToPredicate<'tcx>; /// Suggest to await before try: future? => future.await? fn suggest_await_before_try( @@ -335,7 +331,7 @@ pub trait TypeErrCtxtExt<'tcx> { ); } -fn predicate_constraint(generics: &hir::Generics<'_>, pred: String) -> (Span, String) { +fn predicate_constraint(generics: &hir::Generics<'_>, pred: ty::Predicate<'_>) -> (Span, String) { ( generics.tail_span_for_predicate_suggestion(), format!("{} {}", generics.add_where_or_trailing_comma(), pred), @@ -417,7 +413,7 @@ fn suggest_restriction<'tcx>( }, // `fn foo(t: impl Trait)` // ^ suggest `where <T as Trait>::A: Bound` - predicate_constraint(hir_generics, trait_pred.to_predicate(tcx).to_string()), + predicate_constraint(hir_generics, trait_pred.to_predicate(tcx)), ]; sugg.extend(ty_spans.into_iter().map(|s| (s, type_param_name.to_string()))); @@ -441,9 +437,7 @@ fn suggest_restriction<'tcx>( .find(|p| !matches!(p.kind, hir::GenericParamKind::Type { synthetic: true, .. })), super_traits, ) { - (_, None) => { - predicate_constraint(hir_generics, trait_pred.to_predicate(tcx).to_string()) - } + (_, None) => predicate_constraint(hir_generics, trait_pred.to_predicate(tcx)), (None, Some((ident, []))) => ( ident.span.shrink_to_hi(), format!(": {}", trait_pred.print_modifiers_and_trait_path()), @@ -714,7 +708,6 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { obligation.cause.body_id, span, base_ty, - span, ); if let Some(steps) = autoderef.find_map(|(ty, steps)| { // Re-add the `&` @@ -814,7 +807,7 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { err: &mut Diagnostic, trait_pred: ty::PolyTraitPredicate<'tcx>, ) -> bool { - if let ty::PredicateKind::Trait(trait_pred) = obligation.predicate.kind().skip_binder() + if let ty::PredicateKind::Clause(ty::Clause::Trait(trait_pred)) = obligation.predicate.kind().skip_binder() && Some(trait_pred.def_id()) == self.tcx.lang_items().sized_trait() { // Don't suggest calling to turn an unsized type into a sized type @@ -843,7 +836,7 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { } ty::Opaque(def_id, substs) => { self.tcx.bound_item_bounds(def_id).subst(self.tcx, substs).iter().find_map(|pred| { - if let ty::PredicateKind::Projection(proj) = pred.kind().skip_binder() + if let ty::PredicateKind::Clause(ty::Clause::Projection(proj)) = pred.kind().skip_binder() && Some(proj.projection_ty.item_def_id) == self.tcx.lang_items().fn_once_output() // args tuple will always be substs[1] && let ty::Tuple(args) = proj.projection_ty.substs.type_at(1).kind() @@ -877,7 +870,7 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { } ty::Param(_) => { obligation.param_env.caller_bounds().iter().find_map(|pred| { - if let ty::PredicateKind::Projection(proj) = pred.kind().skip_binder() + if let ty::PredicateKind::Clause(ty::Clause::Projection(proj)) = pred.kind().skip_binder() && Some(proj.projection_ty.item_def_id) == self.tcx.lang_items().fn_once_output() && proj.projection_ty.self_ty() == found // args tuple will always be substs[1] @@ -1019,7 +1012,7 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { let mut never_suggest_borrow: Vec<_> = [LangItem::Copy, LangItem::Clone, LangItem::Unpin, LangItem::Sized] .iter() - .filter_map(|lang_item| self.tcx.lang_items().require(*lang_item).ok()) + .filter_map(|lang_item| self.tcx.lang_items().get(*lang_item)) .collect(); if let Some(def_id) = self.tcx.get_diagnostic_item(sym::Send) { @@ -1063,7 +1056,7 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { { ( mk_result(old_pred.map_bound(|trait_pred| (trait_pred, *ty))), - matches!(mutability, hir::Mutability::Mut), + mutability.is_mut(), ) } else { (false, false) @@ -1117,7 +1110,7 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { err.span_suggestions( span.shrink_to_lo(), "consider borrowing here", - ["&".to_string(), "&mut ".to_string()].into_iter(), + ["&".to_string(), "&mut ".to_string()], Applicability::MaybeIncorrect, ); } else { @@ -1164,7 +1157,7 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { for predicate in predicates.iter() { if !self.predicate_must_hold_modulo_regions( - &obligation.with(predicate.with_self_ty(self.tcx, self_ref_ty)), + &obligation.with(self.tcx, predicate.with_self_ty(self.tcx, self_ref_ty)), ) { return; } @@ -1260,7 +1253,7 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { ); // FIXME: account for associated `async fn`s. if let hir::Expr { span, kind: hir::ExprKind::Call(base, _), .. } = expr { - if let ty::PredicateKind::Trait(pred) = + if let ty::PredicateKind::Clause(ty::Clause::Trait(pred)) = obligation.predicate.kind().skip_binder() { err.span_label( @@ -1353,7 +1346,7 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { .sess .source_map() .span_take_while(span, |c| c.is_whitespace() || *c == '&'); - if points_at_arg && mutability == hir::Mutability::Not && refs_number > 0 { + if points_at_arg && mutability.is_not() && refs_number > 0 { err.span_suggestion_verbose( sp, "consider changing this borrow's mutability", @@ -1525,7 +1518,7 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { let self_ty_satisfies_dyn_predicates = |self_ty| { predicates.iter().all(|predicate| { let pred = predicate.with_self_ty(self.tcx, self_ty); - let obl = Obligation::new(cause.clone(), param_env, pred); + let obl = Obligation::new(self.tcx, cause.clone(), param_env, pred); self.predicate_may_hold(&obl) }) }; @@ -1688,9 +1681,7 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { ) -> Ty<'tcx> { let inputs = trait_ref.skip_binder().substs.type_at(1); let sig = match inputs.kind() { - ty::Tuple(inputs) - if infcx.tcx.fn_trait_kind_from_lang_item(trait_ref.def_id()).is_some() => - { + ty::Tuple(inputs) if infcx.tcx.is_fn_trait(trait_ref.def_id()) => { infcx.tcx.mk_fn_sig( inputs.iter(), infcx.next_ty_var(TypeVariableOrigin { @@ -1760,8 +1751,8 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { if let ObligationCauseCode::ExprBindingObligation(def_id, _, _, idx) = cause && let predicates = self.tcx.predicates_of(def_id).instantiate_identity(self.tcx) && let Some(pred) = predicates.predicates.get(*idx) - && let ty::PredicateKind::Trait(trait_pred) = pred.kind().skip_binder() - && ty::ClosureKind::from_def_id(self.tcx, trait_pred.def_id()).is_some() + && let ty::PredicateKind::Clause(ty::Clause::Trait(trait_pred)) = pred.kind().skip_binder() + && self.tcx.is_fn_trait(trait_pred.def_id()) { let expected_self = self.tcx.anonymize_late_bound_regions(pred.kind().rebind(trait_pred.self_ty())); @@ -1774,9 +1765,8 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { let other_pred = std::iter::zip(&predicates.predicates, &predicates.spans) .enumerate() .find(|(other_idx, (pred, _))| match pred.kind().skip_binder() { - ty::PredicateKind::Trait(trait_pred) - if ty::ClosureKind::from_def_id(self.tcx, trait_pred.def_id()) - .is_some() + ty::PredicateKind::Clause(ty::Clause::Trait(trait_pred)) + if self.tcx.is_fn_trait(trait_pred.def_id()) && other_idx != idx // Make sure that the self type matches // (i.e. constraining this closure) @@ -1890,13 +1880,9 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { // // - `BuiltinDerivedObligation` with a generator witness (B) // - `BuiltinDerivedObligation` with a generator (B) - // - `BuiltinDerivedObligation` with `std::future::GenFuture` (B) - // - `BuiltinDerivedObligation` with `impl std::future::Future` (B) // - `BuiltinDerivedObligation` with `impl std::future::Future` (B) // - `BuiltinDerivedObligation` with a generator witness (A) // - `BuiltinDerivedObligation` with a generator (A) - // - `BuiltinDerivedObligation` with `std::future::GenFuture` (A) - // - `BuiltinDerivedObligation` with `impl std::future::Future` (A) // - `BuiltinDerivedObligation` with `impl std::future::Future` (A) // - `BindingObligation` with `impl_send (Send requirement) // @@ -1905,7 +1891,7 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { // bound was introduced. At least one generator should be present for this diagnostic to be // modified. let (mut trait_ref, mut target_ty) = match obligation.predicate.kind().skip_binder() { - ty::PredicateKind::Trait(p) => (Some(p), Some(p.self_ty())), + ty::PredicateKind::Clause(ty::Clause::Trait(p)) => (Some(p), Some(p.self_ty())), _ => (None, None), }; let mut generator = None; @@ -2004,17 +1990,6 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { .as_local() .and_then(|def_id| hir.maybe_body_owned_by(def_id)) .map(|body_id| hir.body(body_id)); - let is_async = match generator_did.as_local() { - Some(_) => generator_body - .and_then(|body| body.generator_kind()) - .map(|generator_kind| matches!(generator_kind, hir::GeneratorKind::Async(..))) - .unwrap_or(false), - None => self - .tcx - .generator_kind(generator_did) - .map(|generator_kind| matches!(generator_kind, hir::GeneratorKind::Async(..))) - .unwrap_or(false), - }; let mut visitor = AwaitsVisitor::default(); if let Some(body) = generator_body { visitor.visit_body(body); @@ -2044,61 +2019,61 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { eq }; - let mut interior_or_upvar_span = None; - let mut interior_extra_info = None; - // Get the typeck results from the infcx if the generator is the function we are currently // type-checking; otherwise, get them by performing a query. This is needed to avoid // cycles. If we can't use resolved types because the generator comes from another crate, // we still provide a targeted error but without all the relevant spans. - let generator_data: Option<GeneratorData<'tcx, '_>> = match &self.typeck_results { - Some(t) if t.hir_owner.to_def_id() == generator_did_root => { - Some(GeneratorData::Local(&t)) - } + let generator_data = match &self.typeck_results { + Some(t) if t.hir_owner.to_def_id() == generator_did_root => GeneratorData::Local(&t), _ if generator_did.is_local() => { - Some(GeneratorData::Local(self.tcx.typeck(generator_did.expect_local()))) + GeneratorData::Local(self.tcx.typeck(generator_did.expect_local())) } - _ => self - .tcx - .generator_diagnostic_data(generator_did) - .as_ref() - .map(|generator_diag_data| GeneratorData::Foreign(generator_diag_data)), + _ if let Some(generator_diag_data) = self.tcx.generator_diagnostic_data(generator_did) => { + GeneratorData::Foreign(generator_diag_data) + } + _ => return false, }; - if let Some(generator_data) = generator_data.as_ref() { - interior_or_upvar_span = - generator_data.try_get_upvar_span(&self, generator_did, ty_matches); + let mut interior_or_upvar_span = None; - // The generator interior types share the same binders - if let Some(cause) = - generator_data.get_generator_interior_types().skip_binder().iter().find( - |ty::GeneratorInteriorTypeCause { ty, .. }| { - ty_matches(generator_data.get_generator_interior_types().rebind(*ty)) - }, - ) - { - let from_awaited_ty = generator_data.get_from_await_ty(visitor, hir, ty_matches); - let ty::GeneratorInteriorTypeCause { span, scope_span, yield_span, expr, .. } = - cause; + let from_awaited_ty = generator_data.get_from_await_ty(visitor, hir, ty_matches); + debug!(?from_awaited_ty); - interior_or_upvar_span = Some(GeneratorInteriorOrUpvar::Interior(*span)); - interior_extra_info = Some((*scope_span, *yield_span, *expr, from_awaited_ty)); - } + // The generator interior types share the same binders + if let Some(cause) = + generator_data.get_generator_interior_types().skip_binder().iter().find( + |ty::GeneratorInteriorTypeCause { ty, .. }| { + ty_matches(generator_data.get_generator_interior_types().rebind(*ty)) + }, + ) + { + let ty::GeneratorInteriorTypeCause { span, scope_span, yield_span, expr, .. } = cause; - if interior_or_upvar_span.is_none() && generator_data.is_foreign() { - interior_or_upvar_span = Some(GeneratorInteriorOrUpvar::Interior(span)); - } + interior_or_upvar_span = Some(GeneratorInteriorOrUpvar::Interior( + *span, + Some((*scope_span, *yield_span, *expr, from_awaited_ty)), + )); } + if interior_or_upvar_span.is_none() { + interior_or_upvar_span = + generator_data.try_get_upvar_span(&self, generator_did, ty_matches); + } + + if interior_or_upvar_span.is_none() && generator_data.is_foreign() { + interior_or_upvar_span = Some(GeneratorInteriorOrUpvar::Interior(span, None)); + } + + debug!(?interior_or_upvar_span); if let Some(interior_or_upvar_span) = interior_or_upvar_span { - let typeck_results = generator_data.and_then(|generator_data| match generator_data { + let is_async = self.tcx.generator_is_async(generator_did); + let typeck_results = match generator_data { GeneratorData::Local(typeck_results) => Some(typeck_results), GeneratorData::Foreign(_) => None, - }); + }; self.note_obligation_cause_for_async_await( err, interior_or_upvar_span, - interior_extra_info, is_async, outer_generator, trait_ref, @@ -2120,7 +2095,6 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { &self, err: &mut Diagnostic, interior_or_upvar_span: GeneratorInteriorOrUpvar, - interior_extra_info: Option<(Option<Span>, Span, Option<hir::HirId>, Option<Span>)>, is_async: bool, outer_generator: Option<DefId>, trait_pred: ty::TraitPredicate<'tcx>, @@ -2242,7 +2216,7 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { } }; match interior_or_upvar_span { - GeneratorInteriorOrUpvar::Interior(interior_span) => { + GeneratorInteriorOrUpvar::Interior(interior_span, interior_extra_info) => { if let Some((scope_span, yield_span, expr, from_awaited_ty)) = interior_extra_info { if let Some(await_span) = from_awaited_ty { // The type causing this obligation is one being awaited at await_span. @@ -2379,7 +2353,7 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { obligated_types: &mut Vec<Ty<'tcx>>, seen_requirements: &mut FxHashSet<DefId>, ) where - T: fmt::Display, + T: fmt::Display + ToPredicate<'tcx>, { let tcx = self.tcx; match *cause_code { @@ -2407,7 +2381,8 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { | ObligationCauseCode::CheckAssociatedTypeBounds { .. } | ObligationCauseCode::LetElse | ObligationCauseCode::BinOp { .. } - | ObligationCauseCode::AscribeUserTypeProvePredicate(..) => {} + | ObligationCauseCode::AscribeUserTypeProvePredicate(..) + | ObligationCauseCode::RustCall => {} ObligationCauseCode::SliceOrArrayElem => { err.note("slice and array elements must have `Sized` type"); } @@ -2445,12 +2420,12 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { (Ok(l), Ok(r)) => l.line == r.line, _ => true, }; - if !ident.span.overlaps(span) && !same_line { + if !ident.span.is_dummy() && !ident.span.overlaps(span) && !same_line { multispan.push_span_label(ident.span, "required by a bound in this"); } } let descr = format!("required by a bound in `{}`", item_name); - if span != DUMMY_SP { + if !span.is_dummy() { let msg = format!("required by this bound in `{}`", item_name); multispan.push_span_label(span, msg); err.span_note(multispan, &descr); @@ -2636,30 +2611,24 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { } }; - let from_generator = tcx.lang_items().from_generator_fn().unwrap(); + let identity_future = tcx.require_lang_item(LangItem::IdentityFuture, None); // Don't print the tuple of capture types 'print: { if !is_upvar_tys_infer_tuple { let msg = format!("required because it appears within the type `{}`", ty); match ty.kind() { - ty::Adt(def, _) => { - // `gen_future` is used in all async functions; it doesn't add any additional info. - if self.tcx.is_diagnostic_item(sym::gen_future, def.did()) { - break 'print; - } - match self.tcx.opt_item_ident(def.did()) { - Some(ident) => err.span_note(ident.span, &msg), - None => err.note(&msg), - } - } + ty::Adt(def, _) => match self.tcx.opt_item_ident(def.did()) { + Some(ident) => err.span_note(ident.span, &msg), + None => err.note(&msg), + }, ty::Opaque(def_id, _) => { - // Avoid printing the future from `core::future::from_generator`, it's not helpful - if tcx.parent(*def_id) == from_generator { + // Avoid printing the future from `core::future::identity_future`, it's not helpful + if tcx.parent(*def_id) == identity_future { break 'print; } - // If the previous type is `from_generator`, this is the future generated by the body of an async function. + // If the previous type is `identity_future`, this is the future generated by the body of an async function. // Avoid printing it twice (it was already printed in the `ty::Generator` arm below). let is_future = tcx.ty_is_opaque_future(ty); debug!( @@ -2669,8 +2638,8 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { ); if is_future && obligated_types.last().map_or(false, |ty| match ty.kind() { - ty::Opaque(last_def_id, _) => { - tcx.parent(*last_def_id) == from_generator + ty::Generator(last_def_id, ..) => { + tcx.generator_is_async(*last_def_id) } _ => false, }) @@ -2696,7 +2665,7 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { let sp = self.tcx.def_span(def_id); // Special-case this to say "async block" instead of `[static generator]`. - let kind = tcx.generator_kind(def_id).unwrap(); + let kind = tcx.generator_kind(def_id).unwrap().descr(); err.span_note( sp, &format!("required because it's used within this {}", kind), @@ -2713,7 +2682,7 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { obligated_types.push(ty); - let parent_predicate = parent_trait_ref.to_predicate(tcx); + let parent_predicate = parent_trait_ref; if !self.is_recursive_obligation(obligated_types, &data.parent_code) { // #74711: avoid a stack overflow ensure_sufficient_stack(|| { @@ -2744,9 +2713,10 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { self.resolve_vars_if_possible(data.derived.parent_trait_pred); parent_trait_pred.remap_constness_diag(param_env); let parent_def_id = parent_trait_pred.def_id(); + let (self_ty, file) = + self.tcx.short_ty_string(parent_trait_pred.skip_binder().self_ty()); let msg = format!( - "required for `{}` to implement `{}`", - parent_trait_pred.skip_binder().self_ty(), + "required for `{self_ty}` to implement `{}`", parent_trait_pred.print_modifiers_and_trait_path() ); let mut is_auto_trait = false; @@ -2775,7 +2745,13 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { _ => err.note(&msg), }; - let mut parent_predicate = parent_trait_pred.to_predicate(tcx); + if let Some(file) = file { + err.note(&format!( + "the full type name has been written to '{}'", + file.display(), + )); + } + let mut parent_predicate = parent_trait_pred; let mut data = &data.derived; let mut count = 0; seen_requirements.insert(parent_def_id); @@ -2815,11 +2791,18 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { count, pluralize!(count) )); + let (self_ty, file) = + self.tcx.short_ty_string(parent_trait_pred.skip_binder().self_ty()); err.note(&format!( - "required for `{}` to implement `{}`", - parent_trait_pred.skip_binder().self_ty(), + "required for `{self_ty}` to implement `{}`", parent_trait_pred.print_modifiers_and_trait_path() )); + if let Some(file) = file { + err.note(&format!( + "the full type name has been written to '{}'", + file.display(), + )); + } } // #74711: avoid a stack overflow ensure_sufficient_stack(|| { @@ -2835,7 +2818,7 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { } ObligationCauseCode::DerivedObligation(ref data) => { let parent_trait_ref = self.resolve_vars_if_possible(data.parent_trait_pred); - let parent_predicate = parent_trait_ref.to_predicate(tcx); + let parent_predicate = parent_trait_ref; // #74711: avoid a stack overflow ensure_sufficient_stack(|| { self.note_obligation_cause_code( @@ -2968,8 +2951,7 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { let self_ty = self.resolve_vars_if_possible(trait_pred.self_ty()); let impls_future = self.type_implements_trait( future_trait, - self.tcx.erase_late_bound_regions(self_ty), - ty::List::empty(), + [self.tcx.erase_late_bound_regions(self_ty)], obligation.param_env, ); if !impls_future.must_apply_modulo_regions() { @@ -2982,16 +2964,11 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { self.tcx.mk_projection( item_def_id, // Future::Output has no substs - self.tcx.mk_substs_trait(trait_pred.self_ty(), &[]), + self.tcx.mk_substs_trait(trait_pred.self_ty(), []), ) }); - let projection_ty = normalize_to( - &mut SelectionContext::new(self), - obligation.param_env, - obligation.cause.clone(), - projection_ty, - &mut vec![], - ); + let InferOk { value: projection_ty, .. } = + self.at(&obligation.cause, obligation.param_env).normalize(projection_ty); debug!( normalized_projection_type = ?self.resolve_vars_if_possible(projection_ty) @@ -3067,21 +3044,22 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { let field_ty = field.ty(self.tcx, substs); let trait_substs = match diagnostic_name { sym::PartialEq | sym::PartialOrd => { - self.tcx.mk_substs_trait(field_ty, &[field_ty.into()]) + Some(field_ty) } - _ => self.tcx.mk_substs_trait(field_ty, &[]), + _ => None, }; let trait_pred = trait_pred.map_bound_ref(|tr| ty::TraitPredicate { - trait_ref: ty::TraitRef { - substs: trait_substs, - ..trait_pred.skip_binder().trait_ref - }, + trait_ref: self.tcx.mk_trait_ref( + trait_pred.def_id(), + [field_ty].into_iter().chain(trait_substs), + ), ..*tr }); let field_obl = Obligation::new( + self.tcx, obligation.cause.clone(), obligation.param_env, - trait_pred.to_predicate(self.tcx), + trait_pred, ); self.predicate_must_hold_modulo_regions(&field_obl) }) |