syntax_data: {"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // Create a new node, and also add its index to the map.
context_before:             .entry(DropNodeKey { next, local: data.local })
context_after:             .or_insert_with(|| drop_nodes.push(DropNode { data, next }))