{"ast_node_type":"variable","tokens":[{"end":78,"kind":"keyword","start":0,"text":"if"}]}
                if let Some(id) = f.span.ctxt().outer_expn_data().macro_def_id
            } else if f_diagnostic_name == Some(sym::unreachable_display) {
                    && cx.tcx.is_diagnostic_item(sym::unreachable_2015_macro, id)