{"ast_node_type":"other","tokens":[{"end":31,"kind":"keyword","start":0,"text":"Err(value)"}]}
                Err(value) => {
            match panic::catch_unwind(panic::AssertUnwindSafe(|| f(self, dep_node, prev_index))) {
                    if !value.is::<rustc_errors::FatalErrorMarker>() {