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Clarify docs for `DUMMY_NODE_ID`

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Camelid 2021-02-07 19:42:12 -08:00
parent 2af4a01450
commit 0f3e2f68d3
1 changed files with 3 additions and 3 deletions
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6
compiler/rustc_ast/src/node_id.rs
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@ -18,9 +18,9 @@ rustc_data_structures::define_id_collections!(NodeMap, NodeSet, NodeId);
/// The [`NodeId`] used to represent the root of the crate.
pub const CRATE_NODE_ID: NodeId = NodeId::from_u32(0);
/// When parsing and doing expansions, we initially give all AST nodes this AST
/// [`NodeId`]. Then later, during expansion, we renumber them to have small,
/// positive IDs.
/// When parsing and at the beginning of doing expansions, we initially give all AST nodes
/// this dummy AST [`NodeId`]. Then, during a later phase of expansion, we renumber them
/// to have small, positive IDs.
pub const DUMMY_NODE_ID: NodeId = NodeId::MAX;
impl NodeId {