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extract fulfillment err creation

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This commit is contained in:
lcnr 2024-02-23 10:35:43 +01:00
parent 5ec9b8d778
commit dd4be4cb2f
1 changed files with 73 additions and 82 deletions
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155
compiler/rustc_trait_selection/src/solve/fulfill.rs
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@ -73,36 +73,7 @@ fn register_predicate_obligation(
fn collect_remaining_errors(&mut self, infcx: &InferCtxt<'tcx>) -> Vec<FulfillmentError<'tcx>> {
self.obligations
.drain(..)
.map(|obligation| {
let code = infcx.probe(|_| {
match infcx
.evaluate_root_goal(obligation.clone().into(), GenerateProofTree::IfEnabled)
.0
{
Ok((_, Certainty::Maybe(MaybeCause::Ambiguity))) => {
FulfillmentErrorCode::Ambiguity { overflow: None }
}
Ok((
_,
Certainty::Maybe(MaybeCause::Overflow { suggest_increasing_limit }),
)) => FulfillmentErrorCode::Ambiguity {
overflow: Some(suggest_increasing_limit),
},
Ok((_, Certainty::Yes)) => {
bug!("did not expect successful goal when collecting ambiguity errors")
}
Err(_) => {
bug!("did not expect selection error when collecting ambiguity errors")
}
}
});
FulfillmentError {
obligation: obligation.clone(),
code,
root_obligation: obligation,
}
})
.map(|obligation| fulfillment_error_for_stalled(infcx, obligation))
.collect()
}
@ -125,58 +96,7 @@ fn select_where_possible(&mut self, infcx: &InferCtxt<'tcx>) -> Vec<FulfillmentE
let (changed, certainty) = match result {
Ok(result) => result,
Err(NoSolution) => {
errors.push(FulfillmentError {
obligation: obligation.clone(),
code: match goal.predicate.kind().skip_binder() {
ty::PredicateKind::Clause(ty::ClauseKind::Projection(_)) => {
FulfillmentErrorCode::ProjectionError(
// FIXME: This could be a `Sorts` if the term is a type
MismatchedProjectionTypes { err: TypeError::Mismatch },
)
}
ty::PredicateKind::NormalizesTo(..) => {
FulfillmentErrorCode::ProjectionError(
MismatchedProjectionTypes { err: TypeError::Mismatch },
)
}
ty::PredicateKind::AliasRelate(_, _, _) => {
FulfillmentErrorCode::ProjectionError(
MismatchedProjectionTypes { err: TypeError::Mismatch },
)
}
ty::PredicateKind::Subtype(pred) => {
let (a, b) = infcx.enter_forall_and_leak_universe(
goal.predicate.kind().rebind((pred.a, pred.b)),
);
let expected_found = ExpectedFound::new(true, a, b);
FulfillmentErrorCode::SubtypeError(
expected_found,
TypeError::Sorts(expected_found),
)
}
ty::PredicateKind::Coerce(pred) => {
let (a, b) = infcx.enter_forall_and_leak_universe(
goal.predicate.kind().rebind((pred.a, pred.b)),
);
let expected_found = ExpectedFound::new(false, a, b);
FulfillmentErrorCode::SubtypeError(
expected_found,
TypeError::Sorts(expected_found),
)
}
ty::PredicateKind::Clause(_)
| ty::PredicateKind::ObjectSafe(_)
| ty::PredicateKind::Ambiguous => {
FulfillmentErrorCode::SelectionError(
SelectionError::Unimplemented,
)
}
ty::PredicateKind::ConstEquate(..) => {
bug!("unexpected goal: {goal:?}")
}
},
root_obligation: obligation,
});
errors.push(fulfillment_error_for_no_solution(infcx, obligation));
continue;
}
};
@ -206,3 +126,74 @@ fn drain_unstalled_obligations(
std::mem::take(&mut self.obligations)
}
}
fn fulfillment_error_for_no_solution<'tcx>(
infcx: &InferCtxt<'tcx>,
obligation: PredicateObligation<'tcx>,
) -> FulfillmentError<'tcx> {
let code = match obligation.predicate.kind().skip_binder() {
ty::PredicateKind::Clause(ty::ClauseKind::Projection(_)) => {
FulfillmentErrorCode::ProjectionError(
// FIXME: This could be a `Sorts` if the term is a type
MismatchedProjectionTypes { err: TypeError::Mismatch },
)
}
ty::PredicateKind::NormalizesTo(..) => {
FulfillmentErrorCode::ProjectionError(MismatchedProjectionTypes {
err: TypeError::Mismatch,
})
}
ty::PredicateKind::AliasRelate(_, _, _) => {
FulfillmentErrorCode::ProjectionError(MismatchedProjectionTypes {
err: TypeError::Mismatch,
})
}
ty::PredicateKind::Subtype(pred) => {
let (a, b) = infcx.enter_forall_and_leak_universe(
obligation.predicate.kind().rebind((pred.a, pred.b)),
);
let expected_found = ExpectedFound::new(true, a, b);
FulfillmentErrorCode::SubtypeError(expected_found, TypeError::Sorts(expected_found))
}
ty::PredicateKind::Coerce(pred) => {
let (a, b) = infcx.enter_forall_and_leak_universe(
obligation.predicate.kind().rebind((pred.a, pred.b)),
);
let expected_found = ExpectedFound::new(false, a, b);
FulfillmentErrorCode::SubtypeError(expected_found, TypeError::Sorts(expected_found))
}
ty::PredicateKind::Clause(_)
| ty::PredicateKind::ObjectSafe(_)
| ty::PredicateKind::Ambiguous => {
FulfillmentErrorCode::SelectionError(SelectionError::Unimplemented)
}
ty::PredicateKind::ConstEquate(..) => {
bug!("unexpected goal: {obligation:?}")
}
};
FulfillmentError { root_obligation: obligation.clone(), code, obligation }
}
fn fulfillment_error_for_stalled<'tcx>(
infcx: &InferCtxt<'tcx>,
obligation: PredicateObligation<'tcx>,
) -> FulfillmentError<'tcx> {
let code = infcx.probe(|_| {
match infcx.evaluate_root_goal(obligation.clone().into(), GenerateProofTree::Never).0 {
Ok((_, Certainty::Maybe(MaybeCause::Ambiguity))) => {
FulfillmentErrorCode::Ambiguity { overflow: None }
}
Ok((_, Certainty::Maybe(MaybeCause::Overflow { suggest_increasing_limit }))) => {
FulfillmentErrorCode::Ambiguity { overflow: Some(suggest_increasing_limit) }
}
Ok((_, Certainty::Yes)) => {
bug!("did not expect successful goal when collecting ambiguity errors")
}
Err(_) => {
bug!("did not expect selection error when collecting ambiguity errors")
}
}
});
FulfillmentError { obligation: obligation.clone(), code, root_obligation: obligation }
}