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Split match out into a helper function

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This commit is contained in:
Oli Scherer 2022-05-18 14:57:22 +00:00
parent 1de00d1ac5
commit 3d69d23a25
1 changed files with 33 additions and 24 deletions
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57
compiler/rustc_infer/src/infer/outlives/obligations.rs
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@ -71,7 +71,7 @@ use rustc_data_structures::undo_log::UndoLogs;
use rustc_hir::def_id::LocalDefId;
use rustc_middle::mir::ConstraintCategory;
use rustc_middle::ty::subst::GenericArgKind;
use rustc_middle::ty::{self, Region, Ty, TyCtxt, TypeVisitable};
use rustc_middle::ty::{self, Region, SubstsRef, Ty, TyCtxt, TypeVisitable};
use smallvec::smallvec;
impl<'cx, 'tcx> InferCtxt<'cx, 'tcx> {
@ -352,7 +352,7 @@ where
// may not apply.
let mut approx_env_bounds =
self.verify_bound.projection_approx_declared_bounds_from_env(projection_ty);
debug!("projection_must_outlive: approx_env_bounds={:?}", approx_env_bounds);
debug!(?approx_env_bounds);
// Remove outlives bounds that we get from the environment but
// which are also deducible from the trait. This arises (cc
@ -392,27 +392,9 @@ where
// edges, which winds up enforcing the same condition.
let needs_infer = projection_ty.needs_infer();
if approx_env_bounds.is_empty() && trait_bounds.is_empty() && needs_infer {
debug!("projection_must_outlive: no declared bounds");
debug!("no declared bounds");
let constraint = origin.to_constraint_category();
for k in projection_ty.substs {
match k.unpack() {
GenericArgKind::Lifetime(lt) => {
self.delegate.push_sub_region_constraint(
origin.clone(),
region,
lt,
constraint,
);
}
GenericArgKind::Type(ty) => {
self.type_must_outlive(origin.clone(), ty, region, constraint);
}
GenericArgKind::Const(_) => {
// Const parameters don't impose constraints.
}
}
}
self.substs_must_outlive(projection_ty.substs, origin, region);
return;
}
@ -442,8 +424,8 @@ where
.all(|b| b == Some(trait_bounds[0]))
{
let unique_bound = trait_bounds[0];
debug!("projection_must_outlive: unique trait bound = {:?}", unique_bound);
debug!("projection_must_outlive: unique declared bound appears in trait ref");
debug!(?unique_bound);
debug!("unique declared bound appears in trait ref");
let category = origin.to_constraint_category();
self.delegate.push_sub_region_constraint(origin, region, unique_bound, category);
return;
@ -459,6 +441,33 @@ where
debug!("projection_must_outlive: pushing {:?}", verify_bound);
self.delegate.push_verify(origin, generic, region, verify_bound);
}
fn substs_must_outlive(
&mut self,
substs: SubstsRef<'tcx>,
origin: infer::SubregionOrigin<'tcx>,
region: ty::Region<'tcx>,
) {
let constraint = origin.to_constraint_category();
for k in substs {
match k.unpack() {
GenericArgKind::Lifetime(lt) => {
self.delegate.push_sub_region_constraint(
origin.clone(),
region,
lt,
constraint,
);
}
GenericArgKind::Type(ty) => {
self.type_must_outlive(origin.clone(), ty, region, constraint);
}
GenericArgKind::Const(_) => {
// Const parameters don't impose constraints.
}
}
}
}
}
impl<'cx, 'tcx> TypeOutlivesDelegate<'tcx> for &'cx InferCtxt<'cx, 'tcx> {