Harmonize use of leaf and root obligation in trait error reporting
This commit is contained in:
Michael Goulet
parent
8337ba9189
commit
c453c82de4
@ -412,8 +412,8 @@ fn report_selection_error(
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let bound_predicate = obligation.predicate.kind();
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match bound_predicate.skip_binder() {
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ty::PredicateKind::Clause(ty::ClauseKind::Trait(trait_predicate)) => {
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let trait_predicate = bound_predicate.rebind(trait_predicate);
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let trait_predicate = self.resolve_vars_if_possible(trait_predicate);
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let leaf_trait_predicate =
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self.resolve_vars_if_possible(bound_predicate.rebind(trait_predicate));
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// Let's use the root obligation as the main message, when we care about the
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// most general case ("X doesn't implement Pattern<'_>") over the case that
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@ -424,7 +424,7 @@ fn report_selection_error(
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let (main_trait_predicate, o) = if let ty::PredicateKind::Clause(
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ty::ClauseKind::Trait(root_pred)
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) = root_obligation.predicate.kind().skip_binder()
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&& !trait_predicate.self_ty().skip_binder().has_escaping_bound_vars()
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&& !leaf_trait_predicate.self_ty().skip_binder().has_escaping_bound_vars()
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&& !root_pred.self_ty().has_escaping_bound_vars()
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// The type of the leaf predicate is (roughly) the same as the type
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// from the root predicate, as a proxy for "we care about the root"
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@ -434,20 +434,20 @@ fn report_selection_error(
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// `T: Trait` && `&&T: OtherTrait`, we want `OtherTrait`
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self.can_eq(
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obligation.param_env,
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trait_predicate.self_ty().skip_binder(),
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leaf_trait_predicate.self_ty().skip_binder(),
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root_pred.self_ty().peel_refs(),
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)
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// `&str: Iterator` && `&str: IntoIterator`, we want `IntoIterator`
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|| self.can_eq(
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obligation.param_env,
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trait_predicate.self_ty().skip_binder(),
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leaf_trait_predicate.self_ty().skip_binder(),
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root_pred.self_ty(),
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)
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)
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// The leaf trait and the root trait are different, so as to avoid
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// talking about `&mut T: Trait` and instead remain talking about
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// `T: Trait` instead
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&& trait_predicate.def_id() != root_pred.def_id()
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&& leaf_trait_predicate.def_id() != root_pred.def_id()
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// The root trait is not `Unsize`, as to avoid talking about it in
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// `tests/ui/coercion/coerce-issue-49593-box-never.rs`.
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&& Some(root_pred.def_id()) != self.tcx.lang_items().unsize_trait()
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@ -459,13 +459,14 @@ fn report_selection_error(
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root_obligation,
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)
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} else {
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(trait_predicate, &obligation)
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(leaf_trait_predicate, &obligation)
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};
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let trait_ref = main_trait_predicate.to_poly_trait_ref();
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let main_trait_ref = main_trait_predicate.to_poly_trait_ref();
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let leaf_trait_ref = leaf_trait_predicate.to_poly_trait_ref();
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if let Some(guar) = self.emit_specialized_closure_kind_error(
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&obligation,
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trait_ref,
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leaf_trait_ref,
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) {
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return guar;
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}
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@ -473,7 +474,7 @@ fn report_selection_error(
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// FIXME(effects)
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let predicate_is_const = false;
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if let Err(guar) = trait_predicate.error_reported()
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if let Err(guar) = leaf_trait_predicate.error_reported()
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{
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return guar;
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}
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@ -507,16 +508,17 @@ fn report_selection_error(
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notes,
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parent_label,
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append_const_msg,
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} = self.on_unimplemented_note(trait_ref, o, &mut long_ty_file);
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} = self.on_unimplemented_note(main_trait_ref, o, &mut long_ty_file);
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let have_alt_message = message.is_some() || label.is_some();
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let is_try_conversion = self.is_try_conversion(span, trait_ref.def_id());
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let is_try_conversion = self.is_try_conversion(span, main_trait_ref.def_id());
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let is_unsize =
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Some(trait_ref.def_id()) == self.tcx.lang_items().unsize_trait();
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Some(leaf_trait_ref.def_id()) == self.tcx.lang_items().unsize_trait();
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let (message, notes, append_const_msg) = if is_try_conversion {
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(
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Some(format!(
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"`?` couldn't convert the error to `{}`",
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trait_ref.skip_binder().self_ty(),
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main_trait_ref.skip_binder().self_ty(),
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)),
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vec![
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"the question mark operation (`?`) implicitly performs a \
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@ -537,13 +539,13 @@ fn report_selection_error(
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post_message,
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);
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let (err_msg, safe_transmute_explanation) = if Some(trait_ref.def_id())
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let (err_msg, safe_transmute_explanation) = if Some(main_trait_ref.def_id())
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== self.tcx.lang_items().transmute_trait()
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{
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// Recompute the safe transmute reason and use that for the error reporting
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match self.get_safe_transmute_error_and_reason(
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obligation.clone(),
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trait_ref,
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main_trait_ref,
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span,
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) {
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GetSafeTransmuteErrorAndReason::Silent => {
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@ -571,7 +573,7 @@ fn report_selection_error(
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}
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let mut suggested = false;
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if is_try_conversion {
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suggested = self.try_conversion_context(&obligation, trait_ref.skip_binder(), &mut err);
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suggested = self.try_conversion_context(&obligation, main_trait_ref.skip_binder(), &mut err);
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}
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if is_try_conversion && let Some(ret_span) = self.return_type_span(&obligation) {
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@ -579,19 +581,19 @@ fn report_selection_error(
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ret_span,
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format!(
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"expected `{}` because of this",
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trait_ref.skip_binder().self_ty()
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main_trait_ref.skip_binder().self_ty()
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),
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);
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}
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if Some(trait_ref.def_id()) == tcx.lang_items().tuple_trait() {
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if Some(leaf_trait_ref.def_id()) == tcx.lang_items().tuple_trait() {
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self.add_tuple_trait_message(
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obligation.cause.code().peel_derives(),
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&mut err,
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);
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}
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if Some(trait_ref.def_id()) == tcx.lang_items().drop_trait()
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if Some(leaf_trait_ref.def_id()) == tcx.lang_items().drop_trait()
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&& predicate_is_const
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{
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err.note("`~const Drop` was renamed to `~const Destruct`");
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@ -601,15 +603,15 @@ fn report_selection_error(
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let explanation = get_explanation_based_on_obligation(
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self.tcx,
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&obligation,
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trait_ref,
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&trait_predicate,
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leaf_trait_ref,
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&leaf_trait_predicate,
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pre_message,
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);
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self.check_for_binding_assigned_block_without_tail_expression(
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&obligation,
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&mut err,
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trait_predicate,
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leaf_trait_predicate,
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);
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self.suggest_add_result_as_return_type(&obligation,
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&mut err,
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@ -618,7 +620,7 @@ fn report_selection_error(
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if self.suggest_add_reference_to_arg(
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&obligation,
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&mut err,
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trait_predicate,
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leaf_trait_predicate,
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have_alt_message,
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) {
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self.note_obligation_cause(&mut err, &obligation);
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@ -630,7 +632,7 @@ fn report_selection_error(
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// If it has a custom `#[rustc_on_unimplemented]`
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// error message, let's display it as the label!
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err.span_label(span, s);
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if !matches!(trait_ref.skip_binder().self_ty().kind(), ty::Param(_)) {
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if !matches!(leaf_trait_ref.skip_binder().self_ty().kind(), ty::Param(_)) {
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// When the self type is a type param We don't need to "the trait
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// `std::marker::Sized` is not implemented for `T`" as we will point
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// at the type param with a label to suggest constraining it.
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@ -645,7 +647,7 @@ fn report_selection_error(
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if let ObligationCauseCode::Coercion { source, target } =
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*obligation.cause.code().peel_derives()
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{
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if Some(trait_ref.def_id()) == self.tcx.lang_items().sized_trait() {
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if Some(leaf_trait_ref.def_id()) == self.tcx.lang_items().sized_trait() {
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self.suggest_borrowing_for_object_cast(
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&mut err,
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root_obligation,
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@ -657,7 +659,7 @@ fn report_selection_error(
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let UnsatisfiedConst(unsatisfied_const) = self
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.maybe_add_note_for_unsatisfied_const(
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&trait_predicate,
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&leaf_trait_predicate,
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&mut err,
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span,
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);
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@ -674,15 +676,15 @@ fn report_selection_error(
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err.span_label(tcx.def_span(body), s);
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}
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self.suggest_floating_point_literal(&obligation, &mut err, &trait_ref);
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self.suggest_dereferencing_index(&obligation, &mut err, trait_predicate);
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suggested |= self.suggest_dereferences(&obligation, &mut err, trait_predicate);
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suggested |= self.suggest_fn_call(&obligation, &mut err, trait_predicate);
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let impl_candidates = self.find_similar_impl_candidates(trait_predicate);
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self.suggest_floating_point_literal(&obligation, &mut err, &leaf_trait_ref);
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self.suggest_dereferencing_index(&obligation, &mut err, leaf_trait_predicate);
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suggested |= self.suggest_dereferences(&obligation, &mut err, leaf_trait_predicate);
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suggested |= self.suggest_fn_call(&obligation, &mut err, leaf_trait_predicate);
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let impl_candidates = self.find_similar_impl_candidates(leaf_trait_predicate);
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suggested = if let &[cand] = &impl_candidates[..] {
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let cand = cand.trait_ref;
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if let (ty::FnPtr(_), ty::FnDef(..)) =
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(cand.self_ty().kind(), trait_ref.self_ty().skip_binder().kind())
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(cand.self_ty().kind(), main_trait_ref.self_ty().skip_binder().kind())
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{
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err.span_suggestion(
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span.shrink_to_hi(),
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@ -702,31 +704,31 @@ fn report_selection_error(
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false
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} || suggested;
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suggested |=
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self.suggest_remove_reference(&obligation, &mut err, trait_predicate);
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self.suggest_remove_reference(&obligation, &mut err, leaf_trait_predicate);
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suggested |= self.suggest_semicolon_removal(
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&obligation,
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&mut err,
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span,
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trait_predicate,
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leaf_trait_predicate,
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);
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self.note_version_mismatch(&mut err, &trait_ref);
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self.note_version_mismatch(&mut err, &leaf_trait_ref);
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self.suggest_remove_await(&obligation, &mut err);
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self.suggest_derive(&obligation, &mut err, trait_predicate);
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self.suggest_derive(&obligation, &mut err, leaf_trait_predicate);
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if Some(trait_ref.def_id()) == tcx.lang_items().try_trait() {
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if Some(leaf_trait_ref.def_id()) == tcx.lang_items().try_trait() {
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self.suggest_await_before_try(
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&mut err,
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&obligation,
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trait_predicate,
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leaf_trait_predicate,
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span,
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);
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}
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if self.suggest_add_clone_to_arg(&obligation, &mut err, trait_predicate) {
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if self.suggest_add_clone_to_arg(&obligation, &mut err, leaf_trait_predicate) {
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return err.emit();
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}
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if self.suggest_impl_trait(&mut err, &obligation, trait_predicate) {
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if self.suggest_impl_trait(&mut err, &obligation, leaf_trait_predicate) {
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return err.emit();
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}
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@ -741,9 +743,9 @@ fn report_selection_error(
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);
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}
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let is_fn_trait = tcx.is_fn_trait(trait_ref.def_id());
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let is_fn_trait = tcx.is_fn_trait(leaf_trait_ref.def_id());
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let is_target_feature_fn = if let ty::FnDef(def_id, _) =
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*trait_ref.skip_binder().self_ty().kind()
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*leaf_trait_ref.skip_binder().self_ty().kind()
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{
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!self.tcx.codegen_fn_attrs(def_id).target_features.is_empty()
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} else {
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@ -757,8 +759,8 @@ fn report_selection_error(
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self.try_to_add_help_message(
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&obligation,
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trait_ref,
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&trait_predicate,
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leaf_trait_ref,
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&leaf_trait_predicate,
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&mut err,
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span,
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is_fn_trait,
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@ -769,17 +771,17 @@ fn report_selection_error(
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// Changing mutability doesn't make a difference to whether we have
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// an `Unsize` impl (Fixes ICE in #71036)
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if !is_unsize {
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self.suggest_change_mut(&obligation, &mut err, trait_predicate);
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self.suggest_change_mut(&obligation, &mut err, leaf_trait_predicate);
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}
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// If this error is due to `!: Trait` not implemented but `(): Trait` is
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// implemented, and fallback has occurred, then it could be due to a
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// variable that used to fallback to `()` now falling back to `!`. Issue a
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// note informing about the change in behaviour.
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if trait_predicate.skip_binder().self_ty().is_never()
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if leaf_trait_predicate.skip_binder().self_ty().is_never()
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&& self.fallback_has_occurred
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{
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let predicate = trait_predicate.map_bound(|trait_pred| {
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let predicate = leaf_trait_predicate.map_bound(|trait_pred| {
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trait_pred.with_self_ty(self.tcx, tcx.types.unit)
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});
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let unit_obligation = obligation.with(tcx, predicate);
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@ -794,8 +796,8 @@ fn report_selection_error(
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}
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}
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self.explain_hrtb_projection(&mut err, trait_predicate, obligation.param_env, &obligation.cause);
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self.suggest_desugaring_async_fn_in_trait(&mut err, trait_ref);
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self.explain_hrtb_projection(&mut err, leaf_trait_predicate, obligation.param_env, &obligation.cause);
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self.suggest_desugaring_async_fn_in_trait(&mut err, main_trait_ref);
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// Return early if the trait is Debug or Display and the invocation
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// originates within a standard library macro, because the output
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@ -813,15 +815,13 @@ fn report_selection_error(
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if in_std_macro
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&& matches!(
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self.tcx.get_diagnostic_name(trait_ref.def_id()),
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self.tcx.get_diagnostic_name(leaf_trait_ref.def_id()),
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Some(sym::Debug | sym::Display)
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)
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{
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return err.emit();
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}
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err
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}
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@ -2,7 +2,7 @@ error[E0277]: the trait bound `&'static u32: Defaulted` is not satisfied
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--> $DIR/typeck-default-trait-impl-precedence.rs:19:20
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|
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LL | is_defaulted::<&'static u32>();
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| ^^^^^^^^^^^^ the trait `Signed` is not implemented for `&'static u32`, which is required by `&'static u32: Defaulted`
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| ^^^^^^^^^^^^ the trait `Signed` is not implemented for `u32`, which is required by `&'static u32: Defaulted`
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|
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note: required for `&'static u32` to implement `Defaulted`
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--> $DIR/typeck-default-trait-impl-precedence.rs:10:19
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@ -2,7 +2,7 @@ error[E0277]: the trait bound `i32: Baz<Self>` is not satisfied
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--> $DIR/assume-gat-normalization-for-nested-goals.rs:9:30
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|
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LL | type Bar<T>: Baz<Self> = i32;
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| ^^^ the trait `Eq<i32>` is not implemented for `i32`, which is required by `i32: Baz<Self>`
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| ^^^ the trait `Eq<i32>` is not implemented for `<Self as Foo>::Bar<()>`, which is required by `i32: Baz<Self>`
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|
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note: required for `i32` to implement `Baz<Self>`
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--> $DIR/assume-gat-normalization-for-nested-goals.rs:16:23
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@ -4,7 +4,7 @@ error[E0277]: `&'static (dyn Dummy + 'static)` cannot be sent between threads sa
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LL | assert_send::<&'static (dyn Dummy + 'static)>();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `&'static (dyn Dummy + 'static)` cannot be sent between threads safely
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|
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= help: the trait `Sync` is not implemented for `&'static (dyn Dummy + 'static)`, which is required by `&'static (dyn Dummy + 'static): Send`
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= help: the trait `Sync` is not implemented for `(dyn Dummy + 'static)`, which is required by `&'static (dyn Dummy + 'static): Send`
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= note: required for `&'static (dyn Dummy + 'static)` to implement `Send`
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note: required by a bound in `assert_send`
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--> $DIR/kindck-send-object.rs:5:18
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@ -4,7 +4,7 @@ error[E0277]: `&'a (dyn Dummy + 'a)` cannot be sent between threads safely
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LL | assert_send::<&'a dyn Dummy>();
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| ^^^^^^^^^^^^^ `&'a (dyn Dummy + 'a)` cannot be sent between threads safely
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|
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= help: the trait `Sync` is not implemented for `&'a (dyn Dummy + 'a)`, which is required by `&'a (dyn Dummy + 'a): Send`
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= help: the trait `Sync` is not implemented for `(dyn Dummy + 'a)`, which is required by `&'a (dyn Dummy + 'a): Send`
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= note: required for `&'a (dyn Dummy + 'a)` to implement `Send`
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note: required by a bound in `assert_send`
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--> $DIR/kindck-send-object1.rs:5:18
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@ -4,7 +4,7 @@ error[E0277]: `&'static (dyn Dummy + 'static)` cannot be sent between threads sa
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LL | assert_send::<&'static dyn Dummy>();
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| ^^^^^^^^^^^^^^^^^^ `&'static (dyn Dummy + 'static)` cannot be sent between threads safely
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|
|
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= help: the trait `Sync` is not implemented for `&'static (dyn Dummy + 'static)`, which is required by `&'static (dyn Dummy + 'static): Send`
|
||||
= help: the trait `Sync` is not implemented for `(dyn Dummy + 'static)`, which is required by `&'static (dyn Dummy + 'static): Send`
|
||||
= note: required for `&'static (dyn Dummy + 'static)` to implement `Send`
|
||||
note: required by a bound in `assert_send`
|
||||
--> $DIR/kindck-send-object2.rs:3:18
|
||||
|
||||
@ -4,7 +4,7 @@ error[E0277]: `&mut &mut &mut &mut Vec<i32>` is not an iterator
|
||||
LL | for _ in &mut &mut v {}
|
||||
| ^^^^^^^^^^^ `&mut &mut &mut &mut Vec<i32>` is not an iterator
|
||||
|
|
||||
= help: the trait `Iterator` is not implemented for `&mut &mut &mut &mut Vec<i32>`, which is required by `&mut &mut &mut &mut Vec<i32>: IntoIterator`
|
||||
= help: the trait `Iterator` is not implemented for `Vec<i32>`, which is required by `&mut &mut &mut &mut Vec<i32>: IntoIterator`
|
||||
= note: required for `&mut Vec<i32>` to implement `Iterator`
|
||||
= note: 3 redundant requirements hidden
|
||||
= note: required for `&mut &mut &mut &mut Vec<i32>` to implement `Iterator`
|
||||
@ -21,7 +21,7 @@ error[E0277]: `&mut &mut &mut [u8; 1]` is not an iterator
|
||||
LL | for _ in &mut v {}
|
||||
| ^^^^^^ `&mut &mut &mut [u8; 1]` is not an iterator
|
||||
|
|
||||
= help: the trait `Iterator` is not implemented for `&mut &mut &mut [u8; 1]`, which is required by `&mut &mut &mut [u8; 1]: IntoIterator`
|
||||
= help: the trait `Iterator` is not implemented for `[u8; 1]`, which is required by `&mut &mut &mut [u8; 1]: IntoIterator`
|
||||
= note: required for `&mut [u8; 1]` to implement `Iterator`
|
||||
= note: 2 redundant requirements hidden
|
||||
= note: required for `&mut &mut &mut [u8; 1]` to implement `Iterator`
|
||||
|
||||
@ -4,7 +4,7 @@ error: future cannot be sent between threads safely
|
||||
LL | is_send(foo());
|
||||
| ^^^^^ future returned by `foo` is not `Send`
|
||||
|
|
||||
= help: the trait `Sync` is not implemented for `impl Future<Output = ()>`, which is required by `impl Future<Output = ()>: Send`
|
||||
= help: the trait `Sync` is not implemented for `NotSync`, which is required by `impl Future<Output = ()>: Send`
|
||||
note: future is not `Send` as this value is used across an await
|
||||
--> $DIR/auto-with-drop_tracking_mir.rs:16:11
|
||||
|
|
||||
|
||||
@ -4,6 +4,11 @@ error[E0277]: the trait bound `(): Foo` is not satisfied
|
||||
LL | needs_foo::<()>();
|
||||
| ^^ the trait `Bar` is not implemented for `()`, which is required by `(): Foo`
|
||||
|
|
||||
help: this trait has no implementations, consider adding one
|
||||
--> $DIR/point-at-failing-nested.rs:4:1
|
||||
|
|
||||
LL | trait Bar {}
|
||||
| ^^^^^^^^^
|
||||
note: required for `()` to implement `Foo`
|
||||
--> $DIR/point-at-failing-nested.rs:9:12
|
||||
|
|
||||
|
||||
@ -6,6 +6,11 @@ LL | needs_foo(());
|
||||
| |
|
||||
| required by a bound introduced by this call
|
||||
|
|
||||
help: this trait has no implementations, consider adding one
|
||||
--> $DIR/where-clause-doesnt-apply.rs:2:1
|
||||
|
|
||||
LL | trait Bar {}
|
||||
| ^^^^^^^^^
|
||||
note: required for `()` to implement `Foo`
|
||||
--> $DIR/where-clause-doesnt-apply.rs:4:9
|
||||
|
|
||||
|
||||
@ -2,7 +2,7 @@ error[E0277]: the trait bound `&char: Pattern<'_>` is not satisfied
|
||||
--> $DIR/root-obligation.rs:6:38
|
||||
|
|
||||
LL | .filter(|c| "aeiou".contains(c))
|
||||
| -------- ^ the trait `Fn(char)` is not implemented for `&char`, which is required by `&char: Pattern<'_>`
|
||||
| -------- ^ the trait `Fn(char)` is not implemented for `char`, which is required by `&char: Pattern<'_>`
|
||||
| |
|
||||
| required by a bound introduced by this call
|
||||
|
|
||||
|
||||
@ -2,7 +2,7 @@ error[E0277]: `&u8` cannot be safely transmuted into `&UnsafeCell<u8>`
|
||||
--> $DIR/unsafecell.rs:27:50
|
||||
|
|
||||
LL | assert::is_maybe_transmutable::<&'static u8, &'static UnsafeCell<u8>>();
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^ the trait `Freeze` is not implemented for `&'static UnsafeCell<u8>`
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^ the trait `Freeze` is not implemented for `UnsafeCell<u8>`
|
||||
|
|
||||
note: required by a bound in `is_maybe_transmutable`
|
||||
--> $DIR/unsafecell.rs:12:14
|
||||
@ -17,7 +17,7 @@ error[E0277]: `&UnsafeCell<u8>` cannot be safely transmuted into `&UnsafeCell<u8
|
||||
--> $DIR/unsafecell.rs:29:62
|
||||
|
|
||||
LL | assert::is_maybe_transmutable::<&'static UnsafeCell<u8>, &'static UnsafeCell<u8>>();
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^ the trait `Freeze` is not implemented for `&'static UnsafeCell<u8>`
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^ the trait `Freeze` is not implemented for `UnsafeCell<u8>`
|
||||
|
|
||||
note: required by a bound in `is_maybe_transmutable`
|
||||
--> $DIR/unsafecell.rs:12:14
|
||||
|
||||
Loading…
Reference in New Issue
Block a user