fn hash_mir_source<'tcx>(tcx: TyCtxt<'tcx>, hir_body: &'tcx rustc_hir::Body<'tcx>) -> u64 {
// FIXME(cjgillot) Stop hashing HIR manually here.
let owner = hir_body.id().hir_id.owner;
- tcx.hir_owner_nodes(owner).unwrap().hash_including_bodies.to_smaller_hash()
+ tcx.hir_owner_nodes(owner).unwrap().opt_hash_including_bodies.unwrap().to_smaller_hash()
}