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Use a proof tree visitor to refine the Obligation for error reporting
This commit is contained in:
Michael Goulet
parent
382d0f73ad
commit
3e03b1b190
@ -454,7 +454,7 @@ impl<'a, 'tcx> EvalCtxt<'a, 'tcx> {
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} else {
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self.infcx.enter_forall(kind, |kind| {
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let goal = goal.with(self.tcx(), ty::Binder::dummy(kind));
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self.add_goal(GoalSource::Misc, goal);
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self.add_goal(GoalSource::ImplWhereBound, goal);
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self.evaluate_added_goals_and_make_canonical_response(Certainty::Yes)
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})
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}
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@ -1,15 +1,19 @@
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use std::mem;
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use std::ops::ControlFlow;
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use rustc_infer::infer::InferCtxt;
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use rustc_infer::traits::solve::MaybeCause;
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use rustc_infer::traits::query::NoSolution;
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use rustc_infer::traits::solve::inspect::ProbeKind;
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use rustc_infer::traits::solve::{CandidateSource, GoalSource, MaybeCause};
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use rustc_infer::traits::{
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query::NoSolution, FulfillmentError, FulfillmentErrorCode, MismatchedProjectionTypes,
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self, FulfillmentError, FulfillmentErrorCode, MismatchedProjectionTypes, Obligation,
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PredicateObligation, SelectionError, TraitEngine,
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};
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use rustc_middle::ty;
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use rustc_middle::ty::error::{ExpectedFound, TypeError};
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use super::eval_ctxt::GenerateProofTree;
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use super::inspect::{ProofTreeInferCtxtExt, ProofTreeVisitor};
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use super::{Certainty, InferCtxtEvalExt};
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/// A trait engine using the new trait solver.
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@ -133,9 +137,9 @@ impl<'tcx> TraitEngine<'tcx> for FulfillmentCtxt<'tcx> {
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.collect();
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errors.extend(self.obligations.overflowed.drain(..).map(|obligation| FulfillmentError {
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root_obligation: obligation.clone(),
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obligation: find_best_leaf_obligation(infcx, &obligation),
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code: FulfillmentErrorCode::Ambiguity { overflow: Some(true) },
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obligation,
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root_obligation: obligation,
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}));
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errors
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@ -192,8 +196,10 @@ impl<'tcx> TraitEngine<'tcx> for FulfillmentCtxt<'tcx> {
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fn fulfillment_error_for_no_solution<'tcx>(
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infcx: &InferCtxt<'tcx>,
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obligation: PredicateObligation<'tcx>,
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root_obligation: PredicateObligation<'tcx>,
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) -> FulfillmentError<'tcx> {
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let obligation = find_best_leaf_obligation(infcx, &root_obligation);
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let code = match obligation.predicate.kind().skip_binder() {
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ty::PredicateKind::Clause(ty::ClauseKind::Projection(_)) => {
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FulfillmentErrorCode::ProjectionError(
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@ -213,14 +219,14 @@ fn fulfillment_error_for_no_solution<'tcx>(
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}
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ty::PredicateKind::Subtype(pred) => {
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let (a, b) = infcx.enter_forall_and_leak_universe(
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obligation.predicate.kind().rebind((pred.a, pred.b)),
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root_obligation.predicate.kind().rebind((pred.a, pred.b)),
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);
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let expected_found = ExpectedFound::new(true, a, b);
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FulfillmentErrorCode::SubtypeError(expected_found, TypeError::Sorts(expected_found))
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}
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ty::PredicateKind::Coerce(pred) => {
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let (a, b) = infcx.enter_forall_and_leak_universe(
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obligation.predicate.kind().rebind((pred.a, pred.b)),
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root_obligation.predicate.kind().rebind((pred.a, pred.b)),
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);
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let expected_found = ExpectedFound::new(false, a, b);
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FulfillmentErrorCode::SubtypeError(expected_found, TypeError::Sorts(expected_found))
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@ -234,7 +240,8 @@ fn fulfillment_error_for_no_solution<'tcx>(
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bug!("unexpected goal: {obligation:?}")
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}
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};
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FulfillmentError { root_obligation: obligation.clone(), code, obligation }
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FulfillmentError { obligation, code, root_obligation }
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}
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fn fulfillment_error_for_stalled<'tcx>(
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@ -258,5 +265,135 @@ fn fulfillment_error_for_stalled<'tcx>(
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}
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});
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FulfillmentError { obligation: obligation.clone(), code, root_obligation: obligation }
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FulfillmentError {
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obligation: find_best_leaf_obligation(infcx, &obligation),
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code,
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root_obligation: obligation,
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}
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}
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struct BestObligation<'tcx> {
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obligation: PredicateObligation<'tcx>,
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}
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impl<'tcx> BestObligation<'tcx> {
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fn with_derived_obligation(
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&mut self,
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derive_obligation: impl FnOnce(&mut Self) -> PredicateObligation<'tcx>,
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and_then: impl FnOnce(&mut Self) -> <Self as ProofTreeVisitor<'tcx>>::Result,
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) -> <Self as ProofTreeVisitor<'tcx>>::Result {
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let derived_obligation = derive_obligation(self);
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let old_obligation = std::mem::replace(&mut self.obligation, derived_obligation);
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let res = and_then(self);
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self.obligation = old_obligation;
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res
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}
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}
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impl<'tcx> ProofTreeVisitor<'tcx> for BestObligation<'tcx> {
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type Result = ControlFlow<PredicateObligation<'tcx>>;
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fn span(&self) -> rustc_span::Span {
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self.obligation.cause.span
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}
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fn visit_goal(&mut self, goal: &super::inspect::InspectGoal<'_, 'tcx>) -> Self::Result {
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let candidates = goal.candidates();
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// FIXME: Throw out candidates that have no failing WC and >1 failing misc goal.
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// HACK:
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if self.obligation.recursion_depth > 3 {
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return ControlFlow::Break(self.obligation.clone());
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}
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let [candidate] = candidates.as_slice() else {
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return ControlFlow::Break(self.obligation.clone());
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};
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// FIXME: Could we extract a trait ref from a projection here too?
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// FIXME: Also, what about considering >1 layer up the stack? May be necessary
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// for normalizes-to.
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let Some(parent_trait_pred) = goal.goal().predicate.to_opt_poly_trait_pred() else {
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return ControlFlow::Break(self.obligation.clone());
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};
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let tcx = goal.infcx().tcx;
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let mut impl_where_bound_count = 0;
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for nested_goal in candidate.instantiate_nested_goals(self.span()) {
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if matches!(nested_goal.source(), GoalSource::ImplWhereBound) {
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impl_where_bound_count += 1;
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} else {
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continue;
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}
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// Skip nested goals that hold.
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if matches!(nested_goal.result(), Ok(Certainty::Yes)) {
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continue;
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}
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self.with_derived_obligation(
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|self_| {
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let mut cause = self_.obligation.cause.clone();
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cause = match candidate.kind() {
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ProbeKind::TraitCandidate {
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source: CandidateSource::Impl(impl_def_id),
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result: _,
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} => {
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let idx = impl_where_bound_count - 1;
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if let Some((_, span)) = tcx
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.predicates_of(impl_def_id)
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.instantiate_identity(tcx)
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.iter()
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.nth(idx)
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{
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cause.derived_cause(parent_trait_pred, |derived| {
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traits::ImplDerivedObligation(Box::new(
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traits::ImplDerivedObligationCause {
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derived,
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impl_or_alias_def_id: impl_def_id,
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impl_def_predicate_index: Some(idx),
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span,
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},
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))
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})
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} else {
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cause
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}
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}
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ProbeKind::TraitCandidate {
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source: CandidateSource::BuiltinImpl(..),
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result: _,
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} => {
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cause.derived_cause(parent_trait_pred, traits::BuiltinDerivedObligation)
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}
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_ => cause,
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};
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Obligation {
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cause,
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param_env: nested_goal.goal().param_env,
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predicate: nested_goal.goal().predicate,
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recursion_depth: self_.obligation.recursion_depth + 1,
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}
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},
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|self_| self_.visit_goal(&nested_goal),
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)?;
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}
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ControlFlow::Break(self.obligation.clone())
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}
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}
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fn find_best_leaf_obligation<'tcx>(
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infcx: &InferCtxt<'tcx>,
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obligation: &PredicateObligation<'tcx>,
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) -> PredicateObligation<'tcx> {
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let obligation = infcx.resolve_vars_if_possible(obligation.clone());
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infcx
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.visit_proof_tree(
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obligation.clone().into(),
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&mut BestObligation { obligation: obligation.clone() },
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)
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.break_value()
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.unwrap_or(obligation)
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}
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@ -11,7 +11,7 @@ error[E0282]: type annotations needed
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--> $DIR/opaques.rs:13:20
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LL | pub fn cast<T>(x: Container<Alias<T>, T>) -> Container<T, T> {
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| ^ cannot infer type for struct `Container<T, T>`
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| ^ cannot infer type for associated type `<T as Trait<T>>::Assoc`
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error: aborting due to 2 previous errors
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@ -2,9 +2,14 @@ error[E0277]: `dyn Iterator<Item = &'a mut u8>` is not an iterator
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--> $DIR/issue-20605.rs:6:17
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LL | for item in *things { *item = 0 }
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| ^^^^^^^ `dyn Iterator<Item = &'a mut u8>` is not an iterator
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| ^^^^^^^ the trait `IntoIterator` is not implemented for `dyn Iterator<Item = &'a mut u8>`
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= help: the trait `IntoIterator` is not implemented for `dyn Iterator<Item = &'a mut u8>`
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= note: the trait bound `dyn Iterator<Item = &'a mut u8>: IntoIterator` is not satisfied
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= note: required for `dyn Iterator<Item = &'a mut u8>` to implement `IntoIterator`
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help: consider mutably borrowing here
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LL | for item in &mut *things { *item = 0 }
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| ++++
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error: the type `<dyn Iterator<Item = &'a mut u8> as IntoIterator>::IntoIter` is not well-formed
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--> $DIR/issue-20605.rs:6:17
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@ -23,7 +23,20 @@ error[E0283]: type annotations needed
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LL | impls_indirect_leak::<Box<_>>();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot infer type of the type parameter `T` declared on the function `impls_indirect_leak`
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= note: cannot satisfy `for<'a> Box<_>: IndirectLeak<'a>`
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note: multiple `impl`s satisfying `for<'a> Box<_>: Leak<'a>` found
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--> $DIR/leak-check-in-selection-3.rs:9:1
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LL | impl Leak<'_> for Box<u32> {}
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^
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LL | impl Leak<'static> for Box<u16> {}
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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note: required for `Box<_>` to implement `for<'a> IndirectLeak<'a>`
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--> $DIR/leak-check-in-selection-3.rs:23:23
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LL | impl<'a, T: Leak<'a>> IndirectLeak<'a> for T {}
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| -------- ^^^^^^^^^^^^^^^^ ^
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| |
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| unsatisfied trait bound introduced here
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note: required by a bound in `impls_indirect_leak`
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--> $DIR/leak-check-in-selection-3.rs:25:27
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@ -1,18 +1,26 @@
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error[E0277]: `impl Future<Output = ()>` cannot be sent between threads safely
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error: future cannot be sent between threads safely
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--> $DIR/auto-with-drop_tracking_mir.rs:25:13
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LL | is_send(foo());
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| ------- ^^^^^ `impl Future<Output = ()>` cannot be sent between threads safely
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| |
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| required by a bound introduced by this call
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| ^^^^^ future returned by `foo` is not `Send`
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|
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= help: the trait `Send` is not implemented for `impl Future<Output = ()>`
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= help: the trait `Sync` is not implemented for `impl Future<Output = ()>`, which is required by `impl Future<Output = ()>: Send`
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note: future is not `Send` as this value is used across an await
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--> $DIR/auto-with-drop_tracking_mir.rs:16:11
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LL | let x = &NotSync;
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| - has type `&NotSync` which is not `Send`
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LL | bar().await;
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| ^^^^^ await occurs here, with `x` maybe used later
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note: required by a bound in `is_send`
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--> $DIR/auto-with-drop_tracking_mir.rs:24:24
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LL | fn is_send(_: impl Send) {}
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| ^^^^ required by this bound in `is_send`
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help: consider dereferencing here
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LL | is_send(*foo());
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| +
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error: aborting due to 1 previous error
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For more information about this error, try `rustc --explain E0277`.
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@ -23,5 +23,5 @@ async fn bar() {}
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fn main() {
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fn is_send(_: impl Send) {}
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is_send(foo());
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//[fail]~^ ERROR `impl Future<Output = ()>` cannot be sent between threads safely
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//[fail]~^ ERROR future cannot be sent between threads safely
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}
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@ -13,5 +13,5 @@ fn foo<F: Fn<T>, T: Tuple>(f: Option<F>, t: T) {
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fn main() {
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foo::<fn() -> str, _>(None, ());
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//~^ expected a `Fn<_>` closure, found `fn() -> str`
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//~^ the size for values of type `str` cannot be known at compilation time
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}
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@ -1,10 +1,11 @@
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error[E0277]: expected a `Fn<_>` closure, found `fn() -> str`
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error[E0277]: the size for values of type `str` cannot be known at compilation time
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--> $DIR/builtin-fn-must-return-sized.rs:15:11
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|
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LL | foo::<fn() -> str, _>(None, ());
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| ^^^^^^^^^^^ expected an `Fn<_>` closure, found `fn() -> str`
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| ^^^^^^^^^^^ doesn't have a size known at compile-time
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|
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= help: the trait `Fn<_>` is not implemented for `fn() -> str`
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= help: within `fn() -> str`, the trait `Sized` is not implemented for `str`, which is required by `fn() -> str: Fn<_>`
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= note: required because it appears within the type `fn() -> str`
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note: required by a bound in `foo`
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--> $DIR/builtin-fn-must-return-sized.rs:10:11
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|
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@ -1,12 +1,12 @@
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error[E0119]: conflicting implementations of trait `Trait` for type `W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<_>>>>>>>>>>>>>>>>>>>>>`
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error[E0119]: conflicting implementations of trait `Trait` for type `W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<_>>>>>>>>>>>>>>>>>>>>>>`
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--> $DIR/coherence-fulfill-overflow.rs:12:1
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|
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LL | impl<T: ?Sized + TwoW> Trait for W<T> {}
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| ------------------------------------- first implementation here
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LL | impl<T: ?Sized + TwoW> Trait for T {}
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<_>>>>>>>>>>>>>>>>>>>>>`
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<_>>>>>>>>>>>>>>>>>>>>>>`
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|
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= note: overflow evaluating the requirement `W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<W<_>>>>>>>>>>>>>>>>>>>>>: TwoW`
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= note: overflow evaluating the requirement `W<W<W<W<W<W<W<W<W<W<W<W<W<W<_>>>>>>>>>>>>>>: TwoW`
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= help: consider increasing the recursion limit by adding a `#![recursion_limit = "20"]` attribute to your crate (`coherence_fulfill_overflow`)
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error: aborting due to 1 previous error
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@ -1,9 +1,16 @@
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error[E0275]: overflow evaluating the requirement `W<_>: Trait`
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error[E0275]: overflow evaluating the requirement `_: Sized`
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--> $DIR/fixpoint-exponential-growth.rs:33:13
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|
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LL | impls::<W<_>>();
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| ^^^^
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|
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note: required for `W<(W<_>, W<_>)>` to implement `Trait`
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--> $DIR/fixpoint-exponential-growth.rs:23:12
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|
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LL | impl<T, U> Trait for W<(W<T>, W<U>)>
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| - ^^^^^ ^^^^^^^^^^^^^^^
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| |
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| unsatisfied trait bound introduced here
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note: required by a bound in `impls`
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--> $DIR/fixpoint-exponential-growth.rs:30:13
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|
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@ -61,7 +61,7 @@ where
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// entering the cycle from `A` fails, but would work if we were to use the cache
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// result of `B<X>`.
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impls_trait::<A<X>, _, _, _>();
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//~^ ERROR the trait bound `A<X>: Trait<_, _, _>` is not satisfied
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//~^ ERROR the trait bound `X: IncompleteGuidance<_, _>` is not satisfied
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}
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fn main() {
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@ -1,10 +1,21 @@
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error[E0277]: the trait bound `A<X>: Trait<_, _, _>` is not satisfied
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error[E0277]: the trait bound `X: IncompleteGuidance<_, _>` is not satisfied
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--> $DIR/incompleteness-unstable-result.rs:63:19
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|
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LL | impls_trait::<A<X>, _, _, _>();
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| ^^^^ the trait `Trait<_, _, _>` is not implemented for `A<X>`
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| ^^^^ the trait `IncompleteGuidance<_, _>` is not implemented for `X`, which is required by `A<X>: Trait<_, _, _>`
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|
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= help: the trait `Trait<U, V, D>` is implemented for `A<T>`
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= help: the following other types implement trait `IncompleteGuidance<T, V>`:
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<T as IncompleteGuidance<U, i16>>
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<T as IncompleteGuidance<U, i8>>
|
||||
<T as IncompleteGuidance<U, u8>>
|
||||
note: required for `A<X>` to implement `Trait<_, _, u8>`
|
||||
--> $DIR/incompleteness-unstable-result.rs:32:50
|
||||
|
|
||||
LL | impl<T: ?Sized, U: ?Sized, V: ?Sized, D: ?Sized> Trait<U, V, D> for A<T>
|
||||
| ^^^^^^^^^^^^^^ ^^^^
|
||||
LL | where
|
||||
LL | T: IncompleteGuidance<U, V>,
|
||||
| ------------------------ unsatisfied trait bound introduced here
|
||||
note: required by a bound in `impls_trait`
|
||||
--> $DIR/incompleteness-unstable-result.rs:51:28
|
||||
|
|
||||
|
||||
@ -4,6 +4,22 @@ error[E0275]: overflow evaluating the requirement `(): Trait`
|
||||
LL | impls_trait::<()>();
|
||||
| ^^
|
||||
|
|
||||
note: required for `()` to implement `Inductive`
|
||||
--> $DIR/double-cycle-inductive-coinductive.rs:12:16
|
||||
|
|
||||
LL | impl<T: Trait> Inductive for T {}
|
||||
| ----- ^^^^^^^^^ ^
|
||||
| |
|
||||
| unsatisfied trait bound introduced here
|
||||
note: required for `()` to implement `Trait`
|
||||
--> $DIR/double-cycle-inductive-coinductive.rs:9:34
|
||||
|
|
||||
LL | impl<T: Inductive + Coinductive> Trait for T {}
|
||||
| --------- ^^^^^ ^
|
||||
| |
|
||||
| unsatisfied trait bound introduced here
|
||||
= note: 2 redundant requirements hidden
|
||||
= note: required for `()` to implement `Trait`
|
||||
note: required by a bound in `impls_trait`
|
||||
--> $DIR/double-cycle-inductive-coinductive.rs:17:19
|
||||
|
|
||||
@ -16,6 +32,22 @@ error[E0275]: overflow evaluating the requirement `(): TraitRev`
|
||||
LL | impls_trait_rev::<()>();
|
||||
| ^^
|
||||
|
|
||||
note: required for `()` to implement `CoinductiveRev`
|
||||
--> $DIR/double-cycle-inductive-coinductive.rs:27:19
|
||||
|
|
||||
LL | impl<T: TraitRev> CoinductiveRev for T {}
|
||||
| -------- ^^^^^^^^^^^^^^ ^
|
||||
| |
|
||||
| unsatisfied trait bound introduced here
|
||||
note: required for `()` to implement `TraitRev`
|
||||
--> $DIR/double-cycle-inductive-coinductive.rs:21:40
|
||||
|
|
||||
LL | impl<T: CoinductiveRev + InductiveRev> TraitRev for T {}
|
||||
| -------------- ^^^^^^^^ ^
|
||||
| |
|
||||
| unsatisfied trait bound introduced here
|
||||
= note: 2 redundant requirements hidden
|
||||
= note: required for `()` to implement `TraitRev`
|
||||
note: required by a bound in `impls_trait_rev`
|
||||
--> $DIR/double-cycle-inductive-coinductive.rs:29:23
|
||||
|
|
||||
|
||||
@ -4,6 +4,16 @@ error[E0275]: overflow evaluating the requirement `W<_>: Trait`
|
||||
LL | impls_trait::<W<_>>();
|
||||
| ^^^^
|
||||
|
|
||||
note: required for `W<W<_>>` to implement `Trait`
|
||||
--> $DIR/inductive-fixpoint-hang.rs:22:17
|
||||
|
|
||||
LL | impl<T: ?Sized> Trait for W<W<T>>
|
||||
| ^^^^^ ^^^^^^^
|
||||
LL | where
|
||||
LL | W<T>: Trait,
|
||||
| ----- unsatisfied trait bound introduced here
|
||||
= note: 3 redundant requirements hidden
|
||||
= note: required for `W<W<W<W<W<_>>>>>` to implement `Trait`
|
||||
note: required by a bound in `impls_trait`
|
||||
--> $DIR/inductive-fixpoint-hang.rs:28:19
|
||||
|
|
||||
|
||||
@ -42,5 +42,5 @@ fn main() {
|
||||
//~^ ERROR overflow evaluating the requirement `(): A`
|
||||
|
||||
impls_ar::<()>();
|
||||
//~^ ERROR overflow evaluating the requirement `(): AR`
|
||||
//~^ ERROR overflow evaluating the requirement `(): CR`
|
||||
}
|
||||
|
||||
@ -4,18 +4,57 @@ error[E0275]: overflow evaluating the requirement `(): A`
|
||||
LL | impls_a::<()>();
|
||||
| ^^
|
||||
|
|
||||
note: required for `()` to implement `B`
|
||||
--> $DIR/inductive-not-on-stack.rs:22:12
|
||||
|
|
||||
LL | impl<T: A> B for T {}
|
||||
| - ^ ^
|
||||
| |
|
||||
| unsatisfied trait bound introduced here
|
||||
note: required for `()` to implement `A`
|
||||
--> $DIR/inductive-not-on-stack.rs:21:16
|
||||
|
|
||||
LL | impl<T: B + C> A for T {}
|
||||
| - ^ ^
|
||||
| |
|
||||
| unsatisfied trait bound introduced here
|
||||
= note: 2 redundant requirements hidden
|
||||
= note: required for `()` to implement `A`
|
||||
note: required by a bound in `impls_a`
|
||||
--> $DIR/inductive-not-on-stack.rs:25:15
|
||||
|
|
||||
LL | fn impls_a<T: A>() {}
|
||||
| ^ required by this bound in `impls_a`
|
||||
|
||||
error[E0275]: overflow evaluating the requirement `(): AR`
|
||||
error[E0275]: overflow evaluating the requirement `(): CR`
|
||||
--> $DIR/inductive-not-on-stack.rs:44:16
|
||||
|
|
||||
LL | impls_ar::<()>();
|
||||
| ^^
|
||||
|
|
||||
note: required for `()` to implement `AR`
|
||||
--> $DIR/inductive-not-on-stack.rs:34:18
|
||||
|
|
||||
LL | impl<T: CR + BR> AR for T {}
|
||||
| -- ^^ ^
|
||||
| |
|
||||
| unsatisfied trait bound introduced here
|
||||
note: required for `()` to implement `BR`
|
||||
--> $DIR/inductive-not-on-stack.rs:35:13
|
||||
|
|
||||
LL | impl<T: AR> BR for T {}
|
||||
| -- ^^ ^
|
||||
| |
|
||||
| unsatisfied trait bound introduced here
|
||||
note: required for `()` to implement `CR`
|
||||
--> $DIR/inductive-not-on-stack.rs:36:13
|
||||
|
|
||||
LL | impl<T: BR> CR for T {}
|
||||
| -- ^^ ^
|
||||
| |
|
||||
| unsatisfied trait bound introduced here
|
||||
= note: 1 redundant requirement hidden
|
||||
= note: required for `()` to implement `AR`
|
||||
note: required by a bound in `impls_ar`
|
||||
--> $DIR/inductive-not-on-stack.rs:38:16
|
||||
|
|
||||
|
||||
@ -35,5 +35,5 @@ fn impls_a<T: A>() {}
|
||||
|
||||
fn main() {
|
||||
impls_a::<()>();
|
||||
//~^ ERROR overflow evaluating the requirement `(): A`
|
||||
//~^ ERROR overflow evaluating the requirement `(): C`
|
||||
}
|
||||
|
||||
@ -1,9 +1,37 @@
|
||||
error[E0275]: overflow evaluating the requirement `(): A`
|
||||
error[E0275]: overflow evaluating the requirement `(): C`
|
||||
--> $DIR/mixed-cycles-1.rs:37:15
|
||||
|
|
||||
LL | impls_a::<()>();
|
||||
| ^^
|
||||
|
|
||||
note: required for `()` to implement `CInd`
|
||||
--> $DIR/mixed-cycles-1.rs:28:21
|
||||
|
|
||||
LL | impl<T: ?Sized + C> CInd for T {}
|
||||
| - ^^^^ ^
|
||||
| |
|
||||
| unsatisfied trait bound introduced here
|
||||
note: required for `()` to implement `B`
|
||||
--> $DIR/mixed-cycles-1.rs:31:28
|
||||
|
|
||||
LL | impl<T: ?Sized + CInd + C> B for T {}
|
||||
| ---- ^ ^
|
||||
| |
|
||||
| unsatisfied trait bound introduced here
|
||||
note: required for `()` to implement `BInd`
|
||||
--> $DIR/mixed-cycles-1.rs:23:21
|
||||
|
|
||||
LL | impl<T: ?Sized + B> BInd for T {}
|
||||
| - ^^^^ ^
|
||||
| |
|
||||
| unsatisfied trait bound introduced here
|
||||
note: required for `()` to implement `A`
|
||||
--> $DIR/mixed-cycles-1.rs:30:28
|
||||
|
|
||||
LL | impl<T: ?Sized + BInd + C> A for T {}
|
||||
| ---- ^ ^
|
||||
| |
|
||||
| unsatisfied trait bound introduced here
|
||||
note: required by a bound in `impls_a`
|
||||
--> $DIR/mixed-cycles-1.rs:34:15
|
||||
|
|
||||
|
||||
@ -28,5 +28,5 @@ fn impls_a<T: A>() {}
|
||||
|
||||
fn main() {
|
||||
impls_a::<()>();
|
||||
//~^ ERROR overflow evaluating the requirement `(): A`
|
||||
//~^ ERROR overflow evaluating the requirement `(): B`
|
||||
}
|
||||
|
||||
@ -1,9 +1,32 @@
|
||||
error[E0275]: overflow evaluating the requirement `(): A`
|
||||
error[E0275]: overflow evaluating the requirement `(): B`
|
||||
--> $DIR/mixed-cycles-2.rs:30:15
|
||||
|
|
||||
LL | impls_a::<()>();
|
||||
| ^^
|
||||
|
|
||||
note: required for `()` to implement `BInd`
|
||||
--> $DIR/mixed-cycles-2.rs:22:21
|
||||
|
|
||||
LL | impl<T: ?Sized + B> BInd for T {}
|
||||
| - ^^^^ ^
|
||||
| |
|
||||
| unsatisfied trait bound introduced here
|
||||
note: required for `()` to implement `B`
|
||||
--> $DIR/mixed-cycles-2.rs:25:24
|
||||
|
|
||||
LL | impl<T: ?Sized + BInd> B for T {}
|
||||
| ---- ^ ^
|
||||
| |
|
||||
| unsatisfied trait bound introduced here
|
||||
= note: 1 redundant requirement hidden
|
||||
= note: required for `()` to implement `BInd`
|
||||
note: required for `()` to implement `A`
|
||||
--> $DIR/mixed-cycles-2.rs:24:28
|
||||
|
|
||||
LL | impl<T: ?Sized + BInd + B> A for T {}
|
||||
| ---- ^ ^
|
||||
| |
|
||||
| unsatisfied trait bound introduced here
|
||||
note: required by a bound in `impls_a`
|
||||
--> $DIR/mixed-cycles-2.rs:27:15
|
||||
|
|
||||
|
||||
@ -25,7 +25,7 @@ fn foo<T: Foo>() {
|
||||
//
|
||||
// https://github.com/rust-lang/trait-system-refactor-initiative/issues/76
|
||||
require_bar::<T>();
|
||||
//~^ ERROR the trait bound `T: Bar` is not satisfied
|
||||
//~^ ERROR type mismatch resolving `<T as Foo>::Assoc == i32`
|
||||
}
|
||||
|
||||
fn main() {}
|
||||
|
||||
@ -1,19 +1,25 @@
|
||||
error[E0277]: the trait bound `T: Bar` is not satisfied
|
||||
error[E0271]: type mismatch resolving `<T as Foo>::Assoc == i32`
|
||||
--> $DIR/param-candidate-shadows-project.rs:27:19
|
||||
|
|
||||
LL | require_bar::<T>();
|
||||
| ^ the trait `Bar` is not implemented for `T`
|
||||
| ^ type mismatch resolving `<T as Foo>::Assoc == i32`
|
||||
|
|
||||
note: types differ
|
||||
--> $DIR/param-candidate-shadows-project.rs:10:18
|
||||
|
|
||||
LL | type Assoc = i32;
|
||||
| ^^^
|
||||
note: required for `T` to implement `Bar`
|
||||
--> $DIR/param-candidate-shadows-project.rs:13:9
|
||||
|
|
||||
LL | impl<T> Bar for T where T: Foo<Assoc = i32> {}
|
||||
| ^^^ ^ ----------- unsatisfied trait bound introduced here
|
||||
note: required by a bound in `require_bar`
|
||||
--> $DIR/param-candidate-shadows-project.rs:15:19
|
||||
|
|
||||
LL | fn require_bar<T: Bar>() {}
|
||||
| ^^^ required by this bound in `require_bar`
|
||||
help: consider further restricting this bound
|
||||
|
|
||||
LL | fn foo<T: Foo + Bar>() {
|
||||
| +++++
|
||||
|
||||
error: aborting due to 1 previous error
|
||||
|
||||
For more information about this error, try `rustc --explain E0277`.
|
||||
For more information about this error, try `rustc --explain E0271`.
|
||||
|
||||
@ -10,7 +10,7 @@ trait Trait: SuperTrait<A = <Self as SuperTrait>::B> {}
|
||||
|
||||
fn transmute<A, B>(x: A) -> B {
|
||||
foo::<A, B, dyn Trait<A = A, B = B>>(x)
|
||||
//~^ ERROR the trait bound `dyn Trait<A = A, B = B>: Trait` is not satisfied
|
||||
//~^ ERROR type mismatch resolving `<dyn Trait<A = A, B = B> as SuperTrait>::A == B`
|
||||
}
|
||||
|
||||
fn foo<A, B, T: ?Sized>(x: T::A) -> B
|
||||
|
||||
@ -1,9 +1,10 @@
|
||||
error[E0277]: the trait bound `dyn Trait<A = A, B = B>: Trait` is not satisfied
|
||||
error[E0271]: type mismatch resolving `<dyn Trait<A = A, B = B> as SuperTrait>::A == B`
|
||||
--> $DIR/more-object-bound.rs:12:5
|
||||
|
|
||||
LL | foo::<A, B, dyn Trait<A = A, B = B>>(x)
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Trait` is not implemented for `dyn Trait<A = A, B = B>`
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ types differ
|
||||
|
|
||||
= note: required because it appears within the type `dyn Trait<A = A, B = B>`
|
||||
note: required by a bound in `foo`
|
||||
--> $DIR/more-object-bound.rs:18:8
|
||||
|
|
||||
@ -12,11 +13,7 @@ LL | fn foo<A, B, T: ?Sized>(x: T::A) -> B
|
||||
LL | where
|
||||
LL | T: Trait<B = B>,
|
||||
| ^^^^^^^^^^^^ required by this bound in `foo`
|
||||
help: consider introducing a `where` clause, but there might be an alternative better way to express this requirement
|
||||
|
|
||||
LL | fn transmute<A, B>(x: A) -> B where dyn Trait<A = A, B = B>: Trait {
|
||||
| ++++++++++++++++++++++++++++++++++++
|
||||
|
||||
error: aborting due to 1 previous error
|
||||
|
||||
For more information about this error, try `rustc --explain E0277`.
|
||||
For more information about this error, try `rustc --explain E0271`.
|
||||
|
||||
@ -24,7 +24,7 @@ fn needs_bar<T: Bar>() {}
|
||||
|
||||
fn foo<T: Foo<Assoc = i32> + Foo<Assoc = u32>>() {
|
||||
needs_bar::<T>();
|
||||
//~^ ERROR type annotations needed: cannot satisfy `T: Bar`
|
||||
//~^ ERROR type annotations needed: cannot satisfy `<T as Foo>::Assoc == i32`
|
||||
}
|
||||
|
||||
fn main() {}
|
||||
|
||||
@ -1,11 +1,14 @@
|
||||
error[E0283]: type annotations needed: cannot satisfy `T: Bar`
|
||||
error[E0284]: type annotations needed: cannot satisfy `<T as Foo>::Assoc == i32`
|
||||
--> $DIR/two-projection-param-candidates-are-ambiguous.rs:26:17
|
||||
|
|
||||
LL | needs_bar::<T>();
|
||||
| ^
|
||||
| ^ cannot satisfy `<T as Foo>::Assoc == i32`
|
||||
|
|
||||
= note: cannot satisfy `T: Bar`
|
||||
= help: the trait `Bar` is implemented for `T`
|
||||
note: required for `T` to implement `Bar`
|
||||
--> $DIR/two-projection-param-candidates-are-ambiguous.rs:21:9
|
||||
|
|
||||
LL | impl<T> Bar for T where T: Foo<Assoc = i32> {}
|
||||
| ^^^ ^ ----------- unsatisfied trait bound introduced here
|
||||
note: required by a bound in `needs_bar`
|
||||
--> $DIR/two-projection-param-candidates-are-ambiguous.rs:23:17
|
||||
|
|
||||
@ -14,4 +17,4 @@ LL | fn needs_bar<T: Bar>() {}
|
||||
|
||||
error: aborting due to 1 previous error
|
||||
|
||||
For more information about this error, try `rustc --explain E0283`.
|
||||
For more information about this error, try `rustc --explain E0284`.
|
||||
|
||||
@ -11,9 +11,9 @@ fn copy<U: Setup + ?Sized>(from: &U::From) -> U::From {
|
||||
pub fn copy_any<T>(t: &T) -> T {
|
||||
copy::<dyn Setup<From=T>>(t)
|
||||
//~^ ERROR the type `&<dyn Setup<From = T> as Setup>::From` is not well-formed
|
||||
//~| ERROR the trait bound `dyn Setup<From = T>: Setup` is not satisfied
|
||||
//~| ERROR mismatched types
|
||||
//~| ERROR the type `<dyn Setup<From = T> as Setup>::From` is not well-formed
|
||||
//~| ERROR the trait bound `T: Copy` is not satisfied
|
||||
|
||||
// FIXME(-Znext-solver): These error messages are horrible and some of them
|
||||
// are even simple fallout from previous error.
|
||||
|
||||
@ -1,18 +1,19 @@
|
||||
error[E0277]: the trait bound `dyn Setup<From = T>: Setup` is not satisfied
|
||||
error[E0277]: the trait bound `T: Copy` is not satisfied in `dyn Setup<From = T>`
|
||||
--> $DIR/object-unsafety.rs:12:12
|
||||
|
|
||||
LL | copy::<dyn Setup<From=T>>(t)
|
||||
| ^^^^^^^^^^^^^^^^^ the trait `Setup` is not implemented for `dyn Setup<From = T>`
|
||||
| ^^^^^^^^^^^^^^^^^ within `dyn Setup<From = T>`, the trait `Copy` is not implemented for `T`, which is required by `dyn Setup<From = T>: Setup`
|
||||
|
|
||||
= note: required because it appears within the type `dyn Setup<From = T>`
|
||||
note: required by a bound in `copy`
|
||||
--> $DIR/object-unsafety.rs:7:12
|
||||
|
|
||||
LL | fn copy<U: Setup + ?Sized>(from: &U::From) -> U::From {
|
||||
| ^^^^^ required by this bound in `copy`
|
||||
help: consider introducing a `where` clause, but there might be an alternative better way to express this requirement
|
||||
help: consider restricting type parameter `T`
|
||||
|
|
||||
LL | pub fn copy_any<T>(t: &T) -> T where dyn Setup<From = T>: Setup {
|
||||
| ++++++++++++++++++++++++++++++++
|
||||
LL | pub fn copy_any<T: std::marker::Copy>(t: &T) -> T {
|
||||
| +++++++++++++++++++
|
||||
|
||||
error: the type `&<dyn Setup<From = T> as Setup>::From` is not well-formed
|
||||
--> $DIR/object-unsafety.rs:12:31
|
||||
|
||||
@ -15,5 +15,5 @@ fn impls<T: Trait>() {}
|
||||
|
||||
fn main() {
|
||||
impls::<W<_>>();
|
||||
//~^ ERROR overflow evaluating the requirement `W<_>: Trait`
|
||||
//~^ ERROR overflow evaluating the requirement `_: Sized`
|
||||
}
|
||||
|
||||
@ -1,9 +1,16 @@
|
||||
error[E0275]: overflow evaluating the requirement `W<_>: Trait`
|
||||
error[E0275]: overflow evaluating the requirement `_: Sized`
|
||||
--> $DIR/exponential-trait-goals.rs:17:13
|
||||
|
|
||||
LL | impls::<W<_>>();
|
||||
| ^^^^
|
||||
|
|
||||
note: required for `W<(W<_>, W<_>)>` to implement `Trait`
|
||||
--> $DIR/exponential-trait-goals.rs:7:12
|
||||
|
|
||||
LL | impl<T, U> Trait for W<(W<T>, W<U>)>
|
||||
| - ^^^^^ ^^^^^^^^^^^^^^^
|
||||
| |
|
||||
| unsatisfied trait bound introduced here
|
||||
note: required by a bound in `impls`
|
||||
--> $DIR/exponential-trait-goals.rs:14:13
|
||||
|
|
||||
|
||||
@ -5,6 +5,15 @@ LL | impls_trait::<Four<Four<Four<Four<()>>>>>();
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
|
|
||||
= help: consider increasing the recursion limit by adding a `#![recursion_limit = "18"]` attribute to your crate (`global_cache`)
|
||||
note: required for `Inc<Inc<Inc<Inc<Inc<Inc<Inc<Inc<Inc<Inc<Inc<Inc<Inc<()>>>>>>>>>>>>>` to implement `Trait`
|
||||
--> $DIR/global-cache.rs:12:16
|
||||
|
|
||||
LL | impl<T: Trait> Trait for Inc<T> {}
|
||||
| ----- ^^^^^ ^^^^^^
|
||||
| |
|
||||
| unsatisfied trait bound introduced here
|
||||
= note: 3 redundant requirements hidden
|
||||
= note: required for `Inc<Inc<Inc<Inc<Inc<Inc<Inc<Inc<Inc<Inc<Inc<Inc<Inc<Inc<Inc<Inc<()>>>>>>>>>>>>>>>>` to implement `Trait`
|
||||
note: required by a bound in `impls_trait`
|
||||
--> $DIR/global-cache.rs:15:19
|
||||
|
|
||||
|
||||
Loading…
Reference in New Issue
Block a user