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add comment for lower_use_tree

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Signed-off-by: SparrowLii <liyuan179@huawei.com>
This commit is contained in:
SparrowLii 2023-07-19 16:48:33 +08:00
parent c6f0a7c3c3
commit 0377945157
1 changed files with 3 additions and 0 deletions
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3
compiler/rustc_ast_lowering/src/item.rs
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@ -559,6 +559,9 @@ impl<'hir> LoweringContext<'_, 'hir> {
self.with_hir_id_owner(id, |this| { self.with_hir_id_owner(id, |this| {
let mut ident = *ident; let mut ident = *ident;
// `prefix` is lowered multiple times, but in different HIR owners.
// So each segment gets renewed `HirId` with the same
// `ItemLocalId` and the new owner. (See `lower_node_id`)
let kind = let kind =
this.lower_use_tree(use_tree, &prefix, id, vis_span, &mut ident, attrs); this.lower_use_tree(use_tree, &prefix, id, vis_span, &mut ident, attrs);
if let Some(attrs) = attrs { if let Some(attrs) = attrs {