syntax_data: {"ast_node_type":"other","tokens":[{"end":74,"kind":"keyword","start":0,"text":"assert!(self.variant_range(def_id,"}]}
source_snippet:         assert!(self.variant_range(def_id, tcx).contains(&variant_index));
context_before:         // the same as the variant index.
context_after:         Discr { val: variant_index.as_usize() as u128, ty: self.discr_ty(tcx) }