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Fix unsoundness bug in functions input references #49885

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Merged
merged 3 commits into from
Apr 15, 2018
Merged

Fix unsoundness bug in functions input references #49885

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9ec7aa2
Run rustfmt over type_check/mod.rs
spastorino Apr 11, 2018
0e2e179
Make prove_predicates take an Iterator
spastorino Apr 11, 2018
55fb12c
Fix unsoundness bug in functions input references
spastorino Apr 11, 2018
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25 changes: 16 additions & 9 deletions src/librustc_mir/borrow_check/nll/type_check/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -275,7 +275,7 @@ impl<'a, 'b, 'gcx, 'tcx> TypeVerifier<'a, 'b, 'gcx, 'tcx> {
tcx.predicates_of(def_id).instantiate(tcx, substs);
let predicates =
type_checker.normalize(&instantiated_predicates.predicates, location);
type_checker.prove_predicates(&predicates, location);
type_checker.prove_predicates(predicates.iter().cloned(), location);
}

value.ty
Expand Down Expand Up @@ -1511,28 +1511,35 @@ impl<'a, 'gcx, 'tcx> TypeChecker<'a, 'gcx, 'tcx> {

let predicates = self.normalize(&instantiated_predicates.predicates, location);
debug!("prove_aggregate_predicates: predicates={:?}", predicates);
self.prove_predicates(&predicates, location);
self.prove_predicates(predicates.iter().cloned(), location);
}

fn prove_trait_ref(&mut self, trait_ref: ty::TraitRef<'tcx>, location: Location) {
self.prove_predicates(
&[ty::Predicate::Trait(
[ty::Predicate::Trait(
trait_ref.to_poly_trait_ref().to_poly_trait_predicate(),
)],
)].iter()
.cloned(),
location,
);
}

fn prove_predicates(&mut self, predicates: &[ty::Predicate<'tcx>], location: Location) {
fn prove_predicates(
&mut self,
predicates: impl IntoIterator<Item = ty::Predicate<'tcx>>,
location: Location,
) {
let mut predicates_iter = predicates.into_iter();

debug!(
"prove_predicates(predicates={:?}, location={:?})",
predicates, location
predicates_iter.by_ref().collect::<Vec<_>>(),
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won't this exhaust the iterator, so that this code no longer generates any obligations below when debug output is enabled?

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Ooops, you're right. Going to fix this :).

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Fixed, PR sent #50076

location
);
self.fully_perform_op(location.at_self(), |this| {
let cause = this.misc(this.last_span);
let obligations = predicates
.iter()
.map(|&p| traits::Obligation::new(cause.clone(), this.param_env, p))
let obligations = predicates_iter
.map(|p| traits::Obligation::new(cause.clone(), this.param_env, p))
.collect();
Ok(InferOk {
value: (),
Expand Down