pub(super) fn gather_moves<'tcx>( body: &Body<'tcx>, tcx: TyCtxt<'tcx>, param_env: ParamEnv<'tcx>) -> Result<(FxHashMap<Local, Place<'tcx>>, MoveData<'tcx>), (MoveData<'tcx>, Vec<(Place<'tcx>, MoveError<'tcx>)>)>