syntax_data: {"ast_node_type":"other","tokens":[{"end":55,"kind":"keyword","start":0,"text":"assert!(self.highlight_bound_region.is_none());"}]}
source_snippet:         assert!(self.highlight_bound_region.is_none());
context_before:     pub fn highlighting_bound_region(&mut self, br: ty::BoundRegionKind, number: usize) {
context_after:         self.highlight_bound_region = Some((br, number));