diff options
Diffstat (limited to 'compiler/rustc_trait_selection/src/traits/error_reporting/type_err_ctxt_ext.rs')
| -rw-r--r-- | compiler/rustc_trait_selection/src/traits/error_reporting/type_err_ctxt_ext.rs | 446 |
1 files changed, 368 insertions, 78 deletions
diff --git a/compiler/rustc_trait_selection/src/traits/error_reporting/type_err_ctxt_ext.rs b/compiler/rustc_trait_selection/src/traits/error_reporting/type_err_ctxt_ext.rs index ba2e3d1ae..9ee091bbd 100644 --- a/compiler/rustc_trait_selection/src/traits/error_reporting/type_err_ctxt_ext.rs +++ b/compiler/rustc_trait_selection/src/traits/error_reporting/type_err_ctxt_ext.rs @@ -3,6 +3,7 @@ use super::suggestions::{get_explanation_based_on_obligation, TypeErrCtxtExt as use crate::errors::{ClosureFnMutLabel, ClosureFnOnceLabel, ClosureKindMismatch}; use crate::infer::error_reporting::{TyCategory, TypeAnnotationNeeded as ErrorCode}; use crate::infer::type_variable::{TypeVariableOrigin, TypeVariableOriginKind}; +use crate::infer::InferCtxtExt as _; use crate::infer::{self, InferCtxt}; use crate::traits::error_reporting::infer_ctxt_ext::InferCtxtExt; use crate::traits::error_reporting::{ambiguity, ambiguity::Ambiguity::*}; @@ -36,11 +37,11 @@ use rustc_middle::ty::{ self, SubtypePredicate, ToPolyTraitRef, ToPredicate, TraitRef, Ty, TyCtxt, TypeFoldable, TypeVisitable, TypeVisitableExt, }; -use rustc_session::config::{DumpSolverProofTree, TraitSolver}; +use rustc_session::config::DumpSolverProofTree; use rustc_session::Limit; use rustc_span::def_id::LOCAL_CRATE; use rustc_span::symbol::sym; -use rustc_span::{ExpnKind, Span, DUMMY_SP}; +use rustc_span::{BytePos, ExpnKind, Span, Symbol, DUMMY_SP}; use std::borrow::Cow; use std::fmt; use std::iter; @@ -98,8 +99,21 @@ pub trait TypeErrCtxtExt<'tcx> { error: &SelectionError<'tcx>, ); + fn emit_specialized_closure_kind_error( + &self, + obligation: &PredicateObligation<'tcx>, + trait_ref: ty::PolyTraitRef<'tcx>, + ) -> Option<ErrorGuaranteed>; + fn fn_arg_obligation(&self, obligation: &PredicateObligation<'tcx>) -> bool; + fn try_conversion_context( + &self, + obligation: &PredicateObligation<'tcx>, + trait_ref: ty::TraitRef<'tcx>, + err: &mut Diagnostic, + ) -> bool; + fn report_const_param_not_wf( &self, ty: Ty<'tcx>, @@ -212,7 +226,7 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { } } - self.tcx.sess.delay_span_bug(DUMMY_SP, "expected fulfillment errors") + self.tcx.sess.span_delayed_bug(DUMMY_SP, "expected fulfillment errors") } /// Reports that an overflow has occurred and halts compilation. We @@ -236,7 +250,12 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { err.emit(); self.tcx.sess.abort_if_errors(); - bug!(); + // FIXME: this should be something like `build_overflow_error_fatal`, which returns + // `DiagnosticBuilder<', !>`. Then we don't even need anything after that `emit()`. + unreachable!( + "did not expect compilation to continue after `abort_if_errors`, \ + since an error was definitely emitted!" + ); } fn build_overflow_error<T>( @@ -356,14 +375,16 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { ) { let tcx = self.tcx; - if tcx.sess.opts.unstable_opts.dump_solver_proof_tree == DumpSolverProofTree::OnError { + if tcx.sess.opts.unstable_opts.next_solver.map(|c| c.dump_tree).unwrap_or_default() + == DumpSolverProofTree::OnError + { dump_proof_tree(root_obligation, self.infcx); } let mut span = obligation.cause.span; // FIXME: statically guarantee this by tainting after the diagnostic is emitted self.set_tainted_by_errors( - tcx.sess.delay_span_bug(span, "`report_selection_error` did not emit an error"), + tcx.sess.span_delayed_bug(span, "`report_selection_error` did not emit an error"), ); let mut err = match *error { @@ -411,6 +432,11 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { ty::PredicateKind::Clause(ty::ClauseKind::Trait(trait_predicate)) => { let trait_predicate = bound_predicate.rebind(trait_predicate); let trait_predicate = self.resolve_vars_if_possible(trait_predicate); + let trait_ref = trait_predicate.to_poly_trait_ref(); + + if let Some(_guar) = self.emit_specialized_closure_kind_error(&obligation, trait_ref) { + return; + } // FIXME(effects) let predicate_is_const = false; @@ -425,22 +451,22 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { // reported on the binding definition (#56607). return; } - let trait_ref = trait_predicate.to_poly_trait_ref(); - let (post_message, pre_message, type_def, file_note) = self + let mut file = None; + let (post_message, pre_message, type_def) = self .get_parent_trait_ref(obligation.cause.code()) .map(|(t, s)| { - let (t, file) = self.tcx.short_ty_string(t); + let t = self.tcx.short_ty_string(t, &mut file); ( format!(" in `{t}`"), format!("within `{t}`, "), s.map(|s| (format!("within this `{t}`"), s)), - file.map(|file| format!( - "the full trait has been written to '{}'", - file.display(), - )) ) }) .unwrap_or_default(); + let file_note = file.map(|file| format!( + "the full trait has been written to '{}'", + file.display(), + )); let OnUnimplementedNote { message, @@ -499,6 +525,11 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { let mut err = struct_span_err!(self.tcx.sess, span, E0277, "{}", err_msg); + let mut suggested = false; + if is_try_conversion { + suggested = self.try_conversion_context(&obligation, trait_ref.skip_binder(), &mut err); + } + if is_try_conversion && let Some(ret_span) = self.return_type_span(&obligation) { err.span_label( ret_span, @@ -511,7 +542,7 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { if Some(trait_ref.def_id()) == tcx.lang_items().tuple_trait() { self.add_tuple_trait_message( - &obligation.cause.code().peel_derives(), + obligation.cause.code().peel_derives(), &mut err, ); } @@ -524,6 +555,7 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { } let explanation = get_explanation_based_on_obligation( + self.tcx, &obligation, trait_ref, &trait_predicate, @@ -569,7 +601,7 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { if Some(trait_ref.def_id()) == self.tcx.lang_items().sized_trait() { self.suggest_borrowing_for_object_cast( &mut err, - &root_obligation, + root_obligation, source, target, ); @@ -599,8 +631,7 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { self.suggest_floating_point_literal(&obligation, &mut err, &trait_ref); self.suggest_dereferencing_index(&obligation, &mut err, trait_predicate); - let mut suggested = - self.suggest_dereferences(&obligation, &mut err, trait_predicate); + suggested |= self.suggest_dereferences(&obligation, &mut err, trait_predicate); suggested |= self.suggest_fn_call(&obligation, &mut err, trait_predicate); let impl_candidates = self.find_similar_impl_candidates(trait_predicate); suggested = if let &[cand] = &impl_candidates[..] { @@ -612,7 +643,7 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { span.shrink_to_hi(), format!( "the trait `{}` is implemented for fn pointer `{}`, try casting using `as`", - cand.print_only_trait_path(), + cand.print_trait_sugared(), cand.self_ty(), ), format!(" as {}", cand.self_ty()), @@ -786,30 +817,22 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { report_object_safety_error(self.tcx, span, trait_def_id, violations) } - ty::PredicateKind::ClosureKind(closure_def_id, closure_args, kind) => { - let found_kind = self.closure_kind(closure_args).unwrap(); - self.report_closure_error(&obligation, closure_def_id, found_kind, kind) - } - ty::PredicateKind::Clause(ty::ClauseKind::WellFormed(ty)) => { let ty = self.resolve_vars_if_possible(ty); - match self.tcx.sess.opts.unstable_opts.trait_solver { - TraitSolver::Classic => { - // WF predicates cannot themselves make - // errors. They can only block due to - // ambiguity; otherwise, they always - // degenerate into other obligations - // (which may fail). - span_bug!(span, "WF predicate not satisfied for {:?}", ty); - } - TraitSolver::Next | TraitSolver::NextCoherence => { - // FIXME: we'll need a better message which takes into account - // which bounds actually failed to hold. - self.tcx.sess.struct_span_err( - span, - format!("the type `{ty}` is not well-formed"), - ) - } + if self.next_trait_solver() { + // FIXME: we'll need a better message which takes into account + // which bounds actually failed to hold. + self.tcx.sess.struct_span_err( + span, + format!("the type `{ty}` is not well-formed"), + ) + } else { + // WF predicates cannot themselves make + // errors. They can only block due to + // ambiguity; otherwise, they always + // degenerate into other obligations + // (which may fail). + span_bug!(span, "WF predicate not satisfied for {:?}", ty); } } @@ -837,6 +860,11 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { ty::PredicateKind::Ambiguous => span_bug!(span, "ambiguous"), + ty::PredicateKind::NormalizesTo(..) => span_bug!( + span, + "NormalizesTo predicate should never be the predicate cause of a SelectionError" + ), + ty::PredicateKind::AliasRelate(..) => span_bug!( span, "AliasRelate predicate should never be the predicate cause of a SelectionError" @@ -927,18 +955,48 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { err.emit(); } + fn emit_specialized_closure_kind_error( + &self, + obligation: &PredicateObligation<'tcx>, + trait_ref: ty::PolyTraitRef<'tcx>, + ) -> Option<ErrorGuaranteed> { + if let ty::Closure(closure_def_id, closure_args) = *trait_ref.self_ty().skip_binder().kind() + && let Some(expected_kind) = self.tcx.fn_trait_kind_from_def_id(trait_ref.def_id()) + && let Some(found_kind) = self.closure_kind(closure_args) + && !found_kind.extends(expected_kind) + && let sig = closure_args.as_closure().sig() + && self.can_sub( + obligation.param_env, + trait_ref, + sig.map_bound(|sig| { + ty::TraitRef::new( + self.tcx, + trait_ref.def_id(), + [trait_ref.self_ty().skip_binder(), sig.inputs()[0]], + ) + }), + ) + { + let mut err = + self.report_closure_error(&obligation, closure_def_id, found_kind, expected_kind); + self.note_obligation_cause(&mut err, &obligation); + self.point_at_returns_when_relevant(&mut err, &obligation); + Some(err.emit()) + } else { + None + } + } + fn fn_arg_obligation(&self, obligation: &PredicateObligation<'tcx>) -> bool { - if let ObligationCauseCode::FunctionArgumentObligation { - arg_hir_id, - .. - } = obligation.cause.code() - && let Some(Node::Expr(arg)) = self.tcx.hir().find(*arg_hir_id) + if let ObligationCauseCode::FunctionArgumentObligation { arg_hir_id, .. } = + obligation.cause.code() + && let Some(Node::Expr(arg)) = self.tcx.opt_hir_node(*arg_hir_id) && let arg = arg.peel_borrows() && let hir::ExprKind::Path(hir::QPath::Resolved( None, hir::Path { res: hir::def::Res::Local(hir_id), .. }, )) = arg.kind - && let Some(Node::Pat(pat)) = self.tcx.hir().find(*hir_id) + && let Some(Node::Pat(pat)) = self.tcx.opt_hir_node(*hir_id) && let Some(preds) = self.reported_trait_errors.borrow().get(&pat.span) && preds.contains(&obligation.predicate) { @@ -947,6 +1005,223 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> { false } + /// When the `E` of the resulting `Result<T, E>` in an expression `foo().bar().baz()?`, + /// identify thoe method chain sub-expressions that could or could not have been annotated + /// with `?`. + fn try_conversion_context( + &self, + obligation: &PredicateObligation<'tcx>, + trait_ref: ty::TraitRef<'tcx>, + err: &mut Diagnostic, + ) -> bool { + let span = obligation.cause.span; + struct V<'v> { + search_span: Span, + found: Option<&'v hir::Expr<'v>>, + } + impl<'v> Visitor<'v> for V<'v> { + fn visit_expr(&mut self, ex: &'v hir::Expr<'v>) { + if let hir::ExprKind::Match(expr, _arms, hir::MatchSource::TryDesugar(_)) = ex.kind + { + if ex.span.with_lo(ex.span.hi() - BytePos(1)).source_equal(self.search_span) { + if let hir::ExprKind::Call(_, [expr, ..]) = expr.kind { + self.found = Some(expr); + return; + } + } + } + hir::intravisit::walk_expr(self, ex); + } + } + let hir_id = self.tcx.local_def_id_to_hir_id(obligation.cause.body_id); + let body_id = match self.tcx.opt_hir_node(hir_id) { + Some(hir::Node::Item(hir::Item { kind: hir::ItemKind::Fn(_, _, body_id), .. })) => { + body_id + } + _ => return false, + }; + let mut v = V { search_span: span, found: None }; + v.visit_body(self.tcx.hir().body(*body_id)); + let Some(expr) = v.found else { + return false; + }; + let Some(typeck) = &self.typeck_results else { + return false; + }; + let Some((ObligationCauseCode::QuestionMark, Some(y))) = obligation.cause.code().parent() + else { + return false; + }; + if !self.tcx.is_diagnostic_item(sym::FromResidual, y.def_id()) { + return false; + } + let self_ty = trait_ref.self_ty(); + let found_ty = trait_ref.args.get(1).and_then(|a| a.as_type()); + + let mut prev_ty = self.resolve_vars_if_possible( + typeck.expr_ty_adjusted_opt(expr).unwrap_or(Ty::new_misc_error(self.tcx)), + ); + + // We always look at the `E` type, because that's the only one affected by `?`. If the + // incorrect `Result<T, E>` is because of the `T`, we'll get an E0308 on the whole + // expression, after the `?` has "unwrapped" the `T`. + let get_e_type = |prev_ty: Ty<'tcx>| -> Option<Ty<'tcx>> { + let ty::Adt(def, args) = prev_ty.kind() else { + return None; + }; + let Some(arg) = args.get(1) else { + return None; + }; + if !self.tcx.is_diagnostic_item(sym::Result, def.did()) { + return None; + } + arg.as_type() + }; + + let mut suggested = false; + let mut chain = vec![]; + + // The following logic is simlar to `point_at_chain`, but that's focused on associated types + let mut expr = expr; + while let hir::ExprKind::MethodCall(path_segment, rcvr_expr, args, span) = expr.kind { + // Point at every method call in the chain with the `Result` type. + // let foo = bar.iter().map(mapper)?; + // ------ ----------- + expr = rcvr_expr; + chain.push((span, prev_ty)); + + let next_ty = self.resolve_vars_if_possible( + typeck.expr_ty_adjusted_opt(expr).unwrap_or(Ty::new_misc_error(self.tcx)), + ); + + let is_diagnostic_item = |symbol: Symbol, ty: Ty<'tcx>| { + let ty::Adt(def, _) = ty.kind() else { + return false; + }; + self.tcx.is_diagnostic_item(symbol, def.did()) + }; + // For each method in the chain, see if this is `Result::map_err` or + // `Option::ok_or_else` and if it is, see if the closure passed to it has an incorrect + // trailing `;`. + if let Some(ty) = get_e_type(prev_ty) + && let Some(found_ty) = found_ty + // Ideally we would instead use `FnCtxt::lookup_method_for_diagnostic` for 100% + // accurate check, but we are in the wrong stage to do that and looking for + // `Result::map_err` by checking the Self type and the path segment is enough. + // sym::ok_or_else + && ( + ( // Result::map_err + path_segment.ident.name == sym::map_err + && is_diagnostic_item(sym::Result, next_ty) + ) || ( // Option::ok_or_else + path_segment.ident.name == sym::ok_or_else + && is_diagnostic_item(sym::Option, next_ty) + ) + ) + // Found `Result<_, ()>?` + && let ty::Tuple(tys) = found_ty.kind() + && tys.is_empty() + // The current method call returns `Result<_, ()>` + && self.can_eq(obligation.param_env, ty, found_ty) + // There's a single argument in the method call and it is a closure + && args.len() == 1 + && let Some(arg) = args.get(0) + && let hir::ExprKind::Closure(closure) = arg.kind + // The closure has a block for its body with no tail expression + && let body = self.tcx.hir().body(closure.body) + && let hir::ExprKind::Block(block, _) = body.value.kind + && let None = block.expr + // The last statement is of a type that can be converted to the return error type + && let [.., stmt] = block.stmts + && let hir::StmtKind::Semi(expr) = stmt.kind + && let expr_ty = self.resolve_vars_if_possible( + typeck.expr_ty_adjusted_opt(expr) + .unwrap_or(Ty::new_misc_error(self.tcx)), + ) + && self + .infcx + .type_implements_trait( + self.tcx.get_diagnostic_item(sym::From).unwrap(), + [self_ty, expr_ty], + obligation.param_env, + ) + .must_apply_modulo_regions() + { + suggested = true; + err.span_suggestion_short( + stmt.span.with_lo(expr.span.hi()), + "remove this semicolon", + String::new(), + Applicability::MachineApplicable, + ); + } + + prev_ty = next_ty; + + if let hir::ExprKind::Path(hir::QPath::Resolved(None, path)) = expr.kind + && let hir::Path { res: hir::def::Res::Local(hir_id), .. } = path + && let Some(hir::Node::Pat(binding)) = self.tcx.opt_hir_node(*hir_id) + && let Some(parent) = self.tcx.hir().find_parent(binding.hir_id) + { + // We've reached the root of the method call chain... + if let hir::Node::Local(local) = parent + && let Some(binding_expr) = local.init + { + // ...and it is a binding. Get the binding creation and continue the chain. + expr = binding_expr; + } + if let hir::Node::Param(_param) = parent { + // ...and it is a an fn argument. + break; + } + } + } + // `expr` is now the "root" expression of the method call chain, which can be any + // expression kind, like a method call or a path. If this expression is `Result<T, E>` as + // well, then we also point at it. + prev_ty = self.resolve_vars_if_possible( + typeck.expr_ty_adjusted_opt(expr).unwrap_or(Ty::new_misc_error(self.tcx)), + ); + chain.push((expr.span, prev_ty)); + + let mut prev = None; + for (span, err_ty) in chain.into_iter().rev() { + let err_ty = get_e_type(err_ty); + let err_ty = match (err_ty, prev) { + (Some(err_ty), Some(prev)) if !self.can_eq(obligation.param_env, err_ty, prev) => { + err_ty + } + (Some(err_ty), None) => err_ty, + _ => { + prev = err_ty; + continue; + } + }; + if self + .infcx + .type_implements_trait( + self.tcx.get_diagnostic_item(sym::From).unwrap(), + [self_ty, err_ty], + obligation.param_env, + ) + .must_apply_modulo_regions() + { + if !suggested { + err.span_label(span, format!("this has type `Result<_, {err_ty}>`")); + } + } else { + err.span_label( + span, + format!( + "this can't be annotated with `?` because it has type `Result<_, {err_ty}>`", + ), + ); + } + prev = Some(err_ty); + } + suggested + } + fn report_const_param_not_wf( &self, ty: Ty<'tcx>, @@ -1291,7 +1566,9 @@ impl<'tcx> InferCtxtPrivExt<'tcx> for TypeErrCtxt<'_, 'tcx> { #[instrument(skip(self), level = "debug")] fn report_fulfillment_error(&self, error: &FulfillmentError<'tcx>) { - if self.tcx.sess.opts.unstable_opts.dump_solver_proof_tree == DumpSolverProofTree::OnError { + if self.tcx.sess.opts.unstable_opts.next_solver.map(|c| c.dump_tree).unwrap_or_default() + == DumpSolverProofTree::OnError + { dump_proof_tree(&error.root_obligation, self.infcx); } @@ -1377,7 +1654,7 @@ impl<'tcx> InferCtxtPrivExt<'tcx> for TypeErrCtxt<'_, 'tcx> { { let data = self.instantiate_binder_with_fresh_vars( obligation.cause.span, - infer::LateBoundRegionConversionTime::HigherRankedType, + infer::BoundRegionConversionTime::HigherRankedType, bound_predicate.rebind(data), ); let unnormalized_term = match data.term.unpack() { @@ -1397,7 +1674,7 @@ impl<'tcx> InferCtxtPrivExt<'tcx> for TypeErrCtxt<'_, 'tcx> { ) .into(), }; - // FIXME(-Ztrait-solver=next): For diagnostic purposes, it would be nice + // FIXME(-Znext-solver): For diagnostic purposes, it would be nice // to deeply normalize this type. let normalized_term = ocx.normalize(&obligation.cause, obligation.param_env, unnormalized_term); @@ -1413,7 +1690,6 @@ impl<'tcx> InferCtxtPrivExt<'tcx> for TypeErrCtxt<'_, 'tcx> { | ObligationCauseCode::ExprItemObligation(..) | ObligationCauseCode::ExprBindingObligation(..) | ObligationCauseCode::Coercion { .. } - | ObligationCauseCode::OpaqueType ); // constrain inference variables a bit more to nested obligations from normalize so @@ -1653,6 +1929,9 @@ impl<'tcx> InferCtxtPrivExt<'tcx> for TypeErrCtxt<'_, 'tcx> { hir::CoroutineKind::Async(hir::CoroutineSource::Block) => "an async block", hir::CoroutineKind::Async(hir::CoroutineSource::Fn) => "an async function", hir::CoroutineKind::Async(hir::CoroutineSource::Closure) => "an async closure", + hir::CoroutineKind::AsyncGen(hir::CoroutineSource::Block) => "an async gen block", + hir::CoroutineKind::AsyncGen(hir::CoroutineSource::Fn) => "an async gen function", + hir::CoroutineKind::AsyncGen(hir::CoroutineSource::Closure) => "an async gen closure", hir::CoroutineKind::Gen(hir::CoroutineSource::Block) => "a gen block", hir::CoroutineKind::Gen(hir::CoroutineSource::Fn) => "a gen function", hir::CoroutineKind::Gen(hir::CoroutineSource::Closure) => "a gen closure", @@ -1751,7 +2030,7 @@ impl<'tcx> InferCtxtPrivExt<'tcx> for TypeErrCtxt<'_, 'tcx> { ct_op: |ct| ct.normalize(self.tcx, ty::ParamEnv::empty()), }); err.highlighted_help(vec![ - (format!("the trait `{}` ", cand.print_only_trait_path()), Style::NoStyle), + (format!("the trait `{}` ", cand.print_trait_sugared()), Style::NoStyle), ("is".to_string(), Style::Highlight), (" implemented for `".to_string(), Style::NoStyle), (cand.self_ty().to_string(), Style::Highlight), @@ -1787,7 +2066,7 @@ impl<'tcx> InferCtxtPrivExt<'tcx> for TypeErrCtxt<'_, 'tcx> { _ => (" implemented for `", ""), }; err.highlighted_help(vec![ - (format!("the trait `{}` ", cand.print_only_trait_path()), Style::NoStyle), + (format!("the trait `{}` ", cand.print_trait_sugared()), Style::NoStyle), ("is".to_string(), Style::Highlight), (desc.to_string(), Style::NoStyle), (cand.self_ty().to_string(), Style::Highlight), @@ -1820,7 +2099,7 @@ impl<'tcx> InferCtxtPrivExt<'tcx> for TypeErrCtxt<'_, 'tcx> { let end = if candidates.len() <= 9 { candidates.len() } else { 8 }; err.help(format!( "the following {other}types implement trait `{}`:{}{}", - trait_ref.print_only_trait_path(), + trait_ref.print_trait_sugared(), candidates[..end].join(""), if candidates.len() > 9 { format!("\nand {} others", candidates.len() - 8) @@ -1967,7 +2246,7 @@ impl<'tcx> InferCtxtPrivExt<'tcx> for TypeErrCtxt<'_, 'tcx> { } } ObligationCauseCode::FunctionArgumentObligation { parent_code, .. } => { - self.get_parent_trait_ref(&parent_code) + self.get_parent_trait_ref(parent_code) } _ => None, } @@ -2182,7 +2461,7 @@ impl<'tcx> InferCtxtPrivExt<'tcx> for TypeErrCtxt<'_, 'tcx> { self.tcx.hir().maybe_body_owned_by(obligation.cause.body_id) { let mut expr_finder = FindExprBySpan::new(span); - expr_finder.visit_expr(&self.tcx.hir().body(body_id).value); + expr_finder.visit_expr(self.tcx.hir().body(body_id).value); if let Some(hir::Expr { kind: hir::ExprKind::Path(hir::QPath::Resolved(None, path)), @@ -2228,7 +2507,7 @@ impl<'tcx> InferCtxtPrivExt<'tcx> for TypeErrCtxt<'_, 'tcx> { ident: trait_name, kind: hir::ItemKind::Trait(_, _, _, _, trait_item_refs), .. - })) = self.tcx.hir().find_by_def_id(local_def_id) + })) = self.tcx.opt_hir_node_by_def_id(local_def_id) && let Some(method_ref) = trait_item_refs .iter() .find(|item_ref| item_ref.ident == *assoc_item_name) @@ -2731,7 +3010,7 @@ impl<'tcx> InferCtxtPrivExt<'tcx> for TypeErrCtxt<'_, 'tcx> { Some(format!("{cannot_do_this} in const contexts")) } // overridden post message - (true, Some(AppendConstMessage::Custom(custom_msg))) => { + (true, Some(AppendConstMessage::Custom(custom_msg, _))) => { Some(format!("{cannot_do_this}{custom_msg}")) } // fallback to generic message @@ -2752,7 +3031,8 @@ impl<'tcx> InferCtxtPrivExt<'tcx> for TypeErrCtxt<'_, 'tcx> { use rustc_transmute::Answer; // Erase regions because layout code doesn't particularly care about regions. - let trait_ref = self.tcx.erase_regions(self.tcx.erase_late_bound_regions(trait_ref)); + let trait_ref = + self.tcx.erase_regions(self.tcx.instantiate_bound_regions_with_erased(trait_ref)); let src_and_dst = rustc_transmute::Types { dst: trait_ref.args.type_at(0), @@ -2933,7 +3213,7 @@ impl<'tcx> InferCtxtPrivExt<'tcx> for TypeErrCtxt<'_, 'tcx> { obligation.param_env, ) { self.report_similar_impl_candidates_for_root_obligation( - &obligation, + obligation, *trait_predicate, body_def_id, err, @@ -3040,18 +3320,18 @@ impl<'tcx> InferCtxtPrivExt<'tcx> for TypeErrCtxt<'_, 'tcx> { // Additional context information explaining why the closure only implements // a particular trait. if let Some(typeck_results) = &self.typeck_results { - let hir_id = self.tcx.hir().local_def_id_to_hir_id(closure_def_id.expect_local()); + let hir_id = self.tcx.local_def_id_to_hir_id(closure_def_id.expect_local()); match (found_kind, typeck_results.closure_kind_origins().get(hir_id)) { (ty::ClosureKind::FnOnce, Some((span, place))) => { err.fn_once_label = Some(ClosureFnOnceLabel { span: *span, - place: ty::place_to_string_for_capture(self.tcx, &place), + place: ty::place_to_string_for_capture(self.tcx, place), }) } (ty::ClosureKind::FnMut, Some((span, place))) => { err.fn_mut_label = Some(ClosureFnMutLabel { span: *span, - place: ty::place_to_string_for_capture(self.tcx, &place), + place: ty::place_to_string_for_capture(self.tcx, place), }) } _ => {} @@ -3115,7 +3395,7 @@ impl<'tcx> InferCtxtPrivExt<'tcx> for TypeErrCtxt<'_, 'tcx> { }; if let Some(diag) = - self.tcx.sess.diagnostic().steal_diagnostic(self.tcx.def_span(def_id), StashKey::Cycle) + self.tcx.sess.dcx().steal_diagnostic(self.tcx.def_span(def_id), StashKey::Cycle) { diag.cancel(); } @@ -3163,7 +3443,7 @@ impl<'tcx> InferCtxtPrivExt<'tcx> for TypeErrCtxt<'_, 'tcx> { let mut not_tupled = false; let found = match found_trait_ref.skip_binder().args.type_at(1).kind() { - ty::Tuple(ref tys) => vec![ArgKind::empty(); tys.len()], + ty::Tuple(tys) => vec![ArgKind::empty(); tys.len()], _ => { not_tupled = true; vec![ArgKind::empty()] @@ -3172,7 +3452,7 @@ impl<'tcx> InferCtxtPrivExt<'tcx> for TypeErrCtxt<'_, 'tcx> { let expected_ty = expected_trait_ref.skip_binder().args.type_at(1); let expected = match expected_ty.kind() { - ty::Tuple(ref tys) => { + ty::Tuple(tys) => { tys.iter().map(|t| ArgKind::from_expected_ty(t, Some(span))).collect() } _ => { @@ -3253,20 +3533,30 @@ impl<'tcx> InferCtxtPrivExt<'tcx> for TypeErrCtxt<'_, 'tcx> { } match obligation.predicate.kind().skip_binder() { - ty::PredicateKind::Clause(ty::ClauseKind::ConstEvaluatable(ct)) => { - let ty::ConstKind::Unevaluated(uv) = ct.kind() else { + ty::PredicateKind::Clause(ty::ClauseKind::ConstEvaluatable(ct)) => match ct.kind() { + ty::ConstKind::Unevaluated(uv) => { + let mut err = + self.tcx.sess.struct_span_err(span, "unconstrained generic constant"); + let const_span = self.tcx.def_span(uv.def); + match self.tcx.sess.source_map().span_to_snippet(const_span) { + Ok(snippet) => err.help(format!( + "try adding a `where` bound using this expression: `where [(); {snippet}]:`" + )), + _ => err.help("consider adding a `where` bound using this expression"), + }; + Some(err) + } + ty::ConstKind::Expr(_) => { + let err = self + .tcx + .sess + .struct_span_err(span, format!("unconstrained generic constant `{ct}`")); + Some(err) + } + _ => { bug!("const evaluatable failed for non-unevaluated const `{ct:?}`"); - }; - let mut err = self.tcx.sess.struct_span_err(span, "unconstrained generic constant"); - let const_span = self.tcx.def_span(uv.def); - match self.tcx.sess.source_map().span_to_snippet(const_span) { - Ok(snippet) => err.help(format!( - "try adding a `where` bound using this expression: `where [(); {snippet}]:`" - )), - _ => err.help("consider adding a `where` bound using this expression"), - }; - Some(err) - } + } + }, _ => { span_bug!( span, |