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change make_query_outlives to take an iterator

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This commit is contained in:
Niko Matsakis 2018-08-21 19:19:49 -04:00
parent a9d496796f
commit 1ca467d4a1
2 changed files with 18 additions and 10 deletions
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19
src/librustc/infer/canonical/query_result.rs
View File

@ -24,19 +24,18 @@
};
use infer::region_constraints::{Constraint, RegionConstraintData};
use infer::InferCtxtBuilder;
use infer::{InferCtxt, InferOk, InferResult, RegionObligation};
use infer::{InferCtxt, InferOk, InferResult};
use rustc_data_structures::indexed_vec::Idx;
use rustc_data_structures::indexed_vec::IndexVec;
use rustc_data_structures::sync::Lrc;
use std::fmt::Debug;
use syntax::ast;
use syntax_pos::DUMMY_SP;
use traits::query::{Fallible, NoSolution};
use traits::{FulfillmentContext, TraitEngine};
use traits::{Obligation, ObligationCause, PredicateObligation};
use ty::fold::TypeFoldable;
use ty::subst::{Kind, UnpackedKind};
use ty::{self, CanonicalVar, Lift, TyCtxt};
use ty::{self, CanonicalVar, Lift, Ty, TyCtxt};
impl<'cx, 'gcx, 'tcx> InferCtxtBuilder<'cx, 'gcx, 'tcx> {
/// The "main method" for a canonicalized trait query. Given the
@ -157,7 +156,12 @@ fn make_query_result<T>(
let region_obligations = self.take_registered_region_obligations();
let region_constraints = self.with_region_constraints(|region_constraints| {
make_query_outlives(tcx, region_obligations, region_constraints)
make_query_outlives(
tcx,
region_obligations
.iter()
.map(|(_, r_o)| (r_o.sup_type, r_o.sub_region)),
region_constraints)
});
let certainty = if ambig_errors.is_empty() {
@ -567,7 +571,7 @@ fn unify_canonical_vars(
/// creates query region constraints.
pub fn make_query_outlives<'tcx>(
tcx: TyCtxt<'_, '_, 'tcx>,
region_obligations: Vec<(ast::NodeId, RegionObligation<'tcx>)>,
outlives_obligations: impl Iterator<Item = (Ty<'tcx>, ty::Region<'tcx>)>,
region_constraints: &RegionConstraintData<'tcx>,
) -> Vec<QueryRegionConstraint<'tcx>> {
let RegionConstraintData {
@ -600,9 +604,8 @@ pub fn make_query_outlives<'tcx>(
.collect();
outlives.extend(
region_obligations
.into_iter()
.map(|(_, r_o)| ty::OutlivesPredicate(r_o.sup_type.into(), r_o.sub_region))
outlives_obligations
.map(|(ty, r)| ty::OutlivesPredicate(ty.into(), r))
.map(ty::Binder::dummy), // no bound regions in the code above
);

9
src/librustc/traits/query/type_op/custom.rs
View File

@ -102,8 +102,13 @@ fn scrape_region_constraints<'gcx, 'tcx, R>(
let region_constraint_data = infcx.take_and_reset_region_constraints();
let outlives =
query_result::make_query_outlives(infcx.tcx, region_obligations, &region_constraint_data);
let outlives = query_result::make_query_outlives(
infcx.tcx,
region_obligations
.iter()
.map(|(_, r_o)| (r_o.sup_type, r_o.sub_region)),
&region_constraint_data,
);
if outlives.is_empty() {
Ok((value, None))