syntax_data: {"ast_node_type":"variable","tokens":[{"end":47,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let scope = self.scopes.pop().unwrap();
context_before:     fn pop_scope(&mut self, region_scope: (region::Scope, SourceInfo)) -> Scope {
context_after:         assert_eq!(scope.region_scope, region_scope.0);