syntax_data: {"ast_node_type":"other","tokens":[{"end":65,"kind":"keyword","start":0,"text":"sub_hashes:"}]}
source_snippet:         sub_hashes: BTreeMap<&'static str, &dyn DepTrackingHash>,
context_before:     pub(crate) fn stable_hash(
context_after:         hasher: &mut StableHasher,