syntax_data: {"ast_node_type":"variable","tokens":[{"end":45,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let mut hasher = StableHasher::new();
context_before:     fn to_stable_hash_key(&self, hcx: &HCX) -> Fingerprint {
context_after:         let mut hcx: HCX = hcx.clone();