syntax_data: {"ast_node_type":"other","tokens":[{"end":41,"kind":"keyword","start":0,"text":"value.visit_with(&mut"}]}
source_snippet:         value.visit_with(&mut collector);
context_before:         let mut collector = RegionNameCollector::new(self.tcx());
context_after:         self.used_region_names = collector.used_region_names;