{"ast_node_type":"other","tokens":[{"end":57,"kind":"keyword","start":0,"text":"#![cfg_attr(feature"}]}
#![cfg_attr(feature = "nightly", feature(new_range_api))]
#![cfg_attr(feature = "nightly", feature(extend_one, step_trait, test))]
#![cfg_attr(feature = "nightly", feature(new_zeroed_alloc))]