syntax_data: {"ast_node_type":"function","tokens":[{"end":76,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:     fn new(stable_crate_id: StableCrateId, local_hash: Hash64) -> ExpnHash {
context_before:     /// `local_hash`, where `local_hash` must be unique within its crate.
context_after:         ExpnHash(Fingerprint::new(stable_crate_id.0, local_hash))