syntax_data: {"ast_node_type":"variable","tokens":[{"end":62,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let var_id = match captured_place.place.base {
context_before:                 let capture = captured_place.info.capture_kind;
context_after:                     HirPlaceBase::Upvar(upvar_id) => upvar_id.var_path.hir_id,