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Small improvements in object lifetime default code

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I found those while trying to understand how the code works.
This commit is contained in:
Nilstrieb 2023-11-12 11:59:01 +01:00
parent ed086d86b8
commit 8bcd221b4c
3 changed files with 4 additions and 10 deletions
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9
compiler/rustc_trait_selection/src/traits/wf.rs
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@ -913,20 +913,15 @@ pub fn object_region_bounds<'tcx>(
tcx: TyCtxt<'tcx>,
existential_predicates: &'tcx ty::List<ty::PolyExistentialPredicate<'tcx>>,
) -> Vec<ty::Region<'tcx>> {
// Since we don't actually *know* the self type for an object,
// this "open(err)" serves as a kind of dummy standin -- basically
// a placeholder type.
let open_ty = Ty::new_fresh(tcx, 0);
let predicates = existential_predicates.iter().filter_map(|predicate| {
if let ty::ExistentialPredicate::Projection(_) = predicate.skip_binder() {
None
} else {
Some(predicate.with_self_ty(tcx, open_ty))
Some(predicate.with_self_ty(tcx, tcx.types.trait_object_dummy_self))
}
});
required_region_bounds(tcx, open_ty, predicates)
required_region_bounds(tcx, tcx.types.trait_object_dummy_self, predicates)
}
/// Given a set of predicates that apply to an object type, returns