syntax_data: {"ast_node_type":"other","tokens":[{"end":80,"kind":"keyword","start":0,"text":"impl<'tcx>"}]}
source_snippet:         impl<'tcx> ty::TypeVisitor<TyCtxt<'tcx>> for RegionNameCollector<'tcx> {
context_after:             fn visit_region(&mut self, r: ty::Region<'tcx>) {