syntax_data: {"ast_node_type":"impl","tokens":[{"end":58,"kind":"keyword","start":0,"text":")"}]}
source_snippet:     ) -> impl Iterator<Item = (VariantIdx, Discr<'tcx>)> {
context_before:         tcx: TyCtxt<'tcx>,
context_after:         self.variant_range(def_id, tcx).map(move |index| {