syntax_data: {"ast_node_type":"other","tokens":[{"end":39,"kind":"keyword","start":0,"text":"for"}]}
source_snippet:             for (key, val) in &self.0 {
context_before:             Hash::hash(&self.0.len(), hasher);
context_after:                 DepTrackingHash::hash(key, hasher, error_format, for_crate_hash);