syntax_data: {"ast_node_type":"other","tokens":[{"end":7,"kind":"keyword","start":0,"text":")"}]}
source_snippet:     ) {
context_before:         path_from_entry: impl Into<AllPathsToHeadCoinductive> + Copy,
context_after:         self.heads.entry(head).or_insert(path_from_entry.into()).and_merge(path_from_entry);