syntax_data: {"ast_node_type":"other","tokens":[{"end":45,"kind":"keyword","start":0,"text":"for"}]}
source_snippet:             for (key, value) in self.iter() {
context_before:             Hash::hash(&self.len(), hasher);
context_after:                 DepTrackingHash::hash(key, hasher, error_format, for_crate_hash);