syntax_data: {"ast_node_type":"other","tokens":[{"end":84,"kind":"keyword","start":0,"text":"assert!(self.superset(input),"}]}
source_snippet:         assert!(self.superset(input), "{:?} not a superset of {:?}", self.0, input);
context_before:     fn renumber_bitset(&self, input: &DenseBitSet<Local>) -> DenseBitSet<CoroutineSavedLocal> {
context_after:         let mut out = DenseBitSet::new_empty(self.count());