{"ast_node_type":"import","tokens":[{"end":53,"kind":"keyword","start":0,"text":"use"}]}
use rustc_session::lint::FutureIncompatibilityReason;
use rustc_middle::ty::{self, Ty, TyCtxt, TypeVisitableExt, Upcast, VariantDef};
// hardwired lints from rustc_lint_defs