{"ast_node_type":"variable","tokens":[{"end":93,"kind":"keyword","start":0,"text":"let"}]}
    let body = fcx.tcx.hir_maybe_body_owned_by(body_id).expect("body id must have an owner");
) -> UnordMap<ty::TyVid, (HirId, Span, UnsafeUseReason)> {
    let mut res = UnordMap::default();