syntax_data: {"ast_node_type":"function","tokens":[{"end":73,"kind":"keyword","start":0,"text":"pub"}]}
source_snippet: pub fn register_local_expn_id(data: ExpnData, hash: ExpnHash) -> ExpnId {
context_before: /// Register an expansion which has been decoded from the on-disk-cache for the local crate.
context_after:     HygieneData::with(|hygiene_data| {