syntax_data: {"ast_node_type":"other","tokens":[{"end":46,"kind":"keyword","start":0,"text":".upvars_mentioned(self.body_owner)"}]}
source_snippet:             .upvars_mentioned(self.body_owner)
context_before:         self.tcx
context_after:             .is_some_and(|upvars| upvars.contains_key(&var_hir_id))