syntax_data: {"ast_node_type":"other","tokens":[{"end":60,"kind":"keyword","start":0,"text":"assert!(if_then_scope.region_scope"}]}
source_snippet:         assert!(if_then_scope.region_scope == region_scope);
context_before:         let if_then_scope = mem::replace(&mut self.scopes.if_then_scope, previous_scope).unwrap();