syntax_data: {"ast_node_type":"other","tokens":[{"end":49,"kind":"keyword","start":0,"text":"var_hir_id,"}]}
source_snippet:             var_hir_id, is_upvar, self.body_owner
context_before:             "convert_var({:?}): is_upvar={}, body_owner={:?}",
context_after:         );