{"ast_node_type":"other","tokens":[{"end":52,"kind":"keyword","start":0,"text":"AstFragment::OptExpr(None)"}]}
                    AstFragment::OptExpr(None) => {}
                    AstFragment::OptExpr(Some(expr)) => try_visit!(visitor.visit_expr(expr)),
                    AstFragment::MethodReceiverExpr(expr) => try_visit!(visitor.visit_method_receiver_expr(expr)),