diff options
| -rw-r--r-- | compiler/rustc_trait_selection/src/traits/vtable.rs | 49 |
1 files changed, 24 insertions, 25 deletions
diff --git a/compiler/rustc_trait_selection/src/traits/vtable.rs b/compiler/rustc_trait_selection/src/traits/vtable.rs index 0a3f423d3c1..ac9fb51e391 100644 --- a/compiler/rustc_trait_selection/src/traits/vtable.rs +++ b/compiler/rustc_trait_selection/src/traits/vtable.rs @@ -116,34 +116,33 @@ fn prepare_vtable_segments_inner<'tcx, T>( loop { // dive deeper into the stack, recording the path 'diving_in: loop { - if let Some((inner_most_trait_ref, _, _)) = stack.last() { - let inner_most_trait_ref = *inner_most_trait_ref; - let mut direct_super_traits_iter = tcx - .super_predicates_of(inner_most_trait_ref.def_id()) - .predicates - .into_iter() - .filter_map(move |(pred, _)| { - pred.subst_supertrait(tcx, &inner_most_trait_ref).as_trait_clause() - }); + let &(inner_most_trait_ref, _, _) = stack.last().unwrap(); + + let mut direct_super_traits_iter = tcx + .super_predicates_of(inner_most_trait_ref.def_id()) + .predicates + .into_iter() + .filter_map(move |(pred, _)| { + pred.subst_supertrait(tcx, &inner_most_trait_ref).as_trait_clause() + }); - 'diving_in_skip_visited_traits: loop { - if let Some(next_super_trait) = direct_super_traits_iter.next() { - if visited.insert(next_super_trait.to_predicate(tcx)) { - // We're throwing away potential constness of super traits here. - // FIXME: handle ~const super traits - let next_super_trait = next_super_trait.map_bound(|t| t.trait_ref); - stack.push(( - next_super_trait, - emit_vptr_on_new_entry, - Some(direct_super_traits_iter), - )); - break 'diving_in_skip_visited_traits; - } else { - continue 'diving_in_skip_visited_traits; - } + 'diving_in_skip_visited_traits: loop { + if let Some(next_super_trait) = direct_super_traits_iter.next() { + if visited.insert(next_super_trait.to_predicate(tcx)) { + // We're throwing away potential constness of super traits here. + // FIXME: handle ~const super traits + let next_super_trait = next_super_trait.map_bound(|t| t.trait_ref); + stack.push(( + next_super_trait, + emit_vptr_on_new_entry, + Some(direct_super_traits_iter), + )); + break 'diving_in_skip_visited_traits; } else { - break 'diving_in; + continue 'diving_in_skip_visited_traits; } + } else { + break 'diving_in; } } } |