syntax_data: {"ast_node_type":"function","tokens":[{"end":51,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:     fn crate_name(&self, cnum: CrateNum) -> Symbol;
context_before:     // incr. comp. uses to identify a CrateNum.
context_after:     fn stable_crate_id(&self, cnum: CrateNum) -> StableCrateId;