bjoernager/rust
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Clean up some generic substs handling

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This commit is contained in:
varkor 2019-02-20 12:47:19 +00:00
parent 162405f222
commit 0da0457593
3 changed files with 35 additions and 18 deletions
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11
src/librustc/infer/opaque_types/mod.rs
View file

@ -381,10 +381,15 @@ impl<'a, 'gcx, 'tcx> InferCtxt<'a, 'gcx, 'tcx> {
substs,
item_def_id: _,
}) => {
for r in substs.regions() {
bound_region(r);
for k in substs {
match k.unpack() {
UnpackedKind::Lifetime(lt) => bound_region(lt),
UnpackedKind::Type(ty) => types.push(ty),
UnpackedKind::Const(_) => {
// Const parameters don't impose constraints.
}
}
}
types.extend(substs.types());
}
Component::EscapingProjection(more_components) => {

20
src/librustc/infer/outlives/obligations.rs
View file

@ -67,6 +67,7 @@ use crate::hir;
use crate::traits::ObligationCause;
use crate::ty::outlives::Component;
use crate::ty::{self, Region, Ty, TyCtxt, TypeFoldable};
use crate::ty::subst::UnpackedKind;
impl<'cx, 'gcx, 'tcx> InferCtxt<'cx, 'gcx, 'tcx> {
/// Registers that the given region obligation must be resolved
@ -430,13 +431,18 @@ where
if approx_env_bounds.is_empty() && trait_bounds.is_empty() && needs_infer {
debug!("projection_must_outlive: no declared bounds");
for component_ty in projection_ty.substs.types() {
self.type_must_outlive(origin.clone(), component_ty, region);
}
for r in projection_ty.substs.regions() {
self.delegate
.push_sub_region_constraint(origin.clone(), region, r);
for k in projection_ty.substs {
match k.unpack() {
UnpackedKind::Lifetime(lt) => {
self.delegate.push_sub_region_constraint(origin.clone(), region, lt);
}
UnpackedKind::Type(ty) => {
self.type_must_outlive(origin.clone(), ty, region);
}
UnpackedKind::Const(_) => {
// Const parameters don't impose constraints.
}
}
}
return;

22
src/librustc_typeck/check/regionck.rs
View file

@ -81,7 +81,7 @@ use rustc::hir::def_id::DefId;
use rustc::infer::outlives::env::OutlivesEnvironment;
use rustc::infer::{self, RegionObligation, SuppressRegionErrors};
use rustc::ty::adjustment;
use rustc::ty::subst::SubstsRef;
use rustc::ty::subst::{SubstsRef, UnpackedKind};
use rustc::ty::{self, Ty};
use rustc::hir::intravisit::{self, NestedVisitorMap, Visitor};
@ -1407,13 +1407,19 @@ impl<'a, 'gcx, 'tcx> RegionCtxt<'a, 'gcx, 'tcx> {
let origin = infer::ParameterInScope(origin, expr_span);
for region in substs.regions() {
self.sub_regions(origin.clone(), expr_region, region);
}
for ty in substs.types() {
let ty = self.resolve_type(ty);
self.type_must_outlive(origin.clone(), ty, expr_region);
for kind in substs {
match kind.unpack() {
UnpackedKind::Lifetime(lt) => {
self.sub_regions(origin.clone(), expr_region, lt);
}
UnpackedKind::Type(ty) => {
let ty = self.resolve_type(ty);
self.type_must_outlive(origin.clone(), ty, expr_region);
}
UnpackedKind::Const(_) => {
// Const parameters don't impose constraints.
}
}
}
}
}