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Replace if let with unwrap in prepare_vtable_segments

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Reasoning: if the stack is empty, the loop will be infinite,
so the assumption is that the stack can't be non empty. Unwrap
makes the assumption more clear (and removes an indentation level)
This commit is contained in:
Maybe Waffle 2023-07-19 09:49:13 +00:00
parent 348f26e409
commit f8f5d7aab2
1 changed files with 24 additions and 25 deletions
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49
compiler/rustc_trait_selection/src/traits/vtable.rs
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@ -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();
'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;
}
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 {
break 'diving_in;
continue 'diving_in_skip_visited_traits;
}
} else {
break 'diving_in;
}
}
}