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Expand comment in with_hir_id_owner.

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This commit is contained in:
Camille GILLOT 2022-05-02 20:32:10 +02:00
parent 15530a1c84
commit 74be945820
1 changed files with 9 additions and 2 deletions
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11
compiler/rustc_ast_lowering/src/lib.rs
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@ -491,6 +491,11 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
self.opt_local_def_id(node).unwrap_or_else(|| panic!("no entry for node id: `{:?}`", node))
}
/// Freshen the `LoweringContext` and ready it to lower a nested item.
/// The lowered item is registered into `self.children`.
///
/// This function sets up `HirId` lowering infrastructure,
/// and stashes the shared mutable state to avoid pollution by the closure.
#[instrument(level = "debug", skip(self, f))]
fn with_hir_id_owner(
&mut self,
@ -509,8 +514,10 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
std::mem::replace(&mut self.item_local_id_counter, hir::ItemLocalId::new(1));
let current_impl_trait_defs = std::mem::take(&mut self.impl_trait_defs);
let current_impl_trait_bounds = std::mem::take(&mut self.impl_trait_bounds);
// Do not reset `next_node_id` and `node_id_to_def_id` as we want to refer to the
// subdefinitions' nodes.
// Do not reset `next_node_id` and `node_id_to_def_id`:
// we want `f` to be able to refer to the `LocalDefId`s that the caller created.
// and the caller to refer to some of the subdefinitions' nodes' `LocalDefId`s.
// Always allocate the first `HirId` for the owner itself.
let _old = self.node_id_to_local_id.insert(owner, hir::ItemLocalId::new(0));