syntax_data: {"ast_node_type":"other","tokens":[{"end":99,"kind":"keyword","start":0,"text":"Some(self.stack[head].has_been_used.map_or(usage_kind,"}]}
source_snippet:             Some(self.stack[head].has_been_used.map_or(usage_kind, |prev| prev.merge(usage_kind)));
context_before:         self.stack[head].has_been_used =