syntax_data: {"ast_node_type":"variable","tokens":[{"end":51,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let highlight = self.region_highlight_mode;
context_before:     fn should_print_region(&self, region: ty::Region<'tcx>) -> bool {
context_after:         if highlight.region_highlighted(region).is_some() {