syntax_data: {"ast_node_type":"function","tokens":[{"end":61,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:             fn visit_region(&mut self, r: ty::Region<'tcx>) {
context_before:         impl<'tcx> ty::TypeVisitor<TyCtxt<'tcx>> for RegionNameCollector<'tcx> {
context_after:                 trace!("address: {:p}", r.0.0);