Function create_deferred_query_stack_frame 

pub(crate) fn create_deferred_query_stack_frame<'tcx, C>(
    tcx: TyCtxt<'tcx>,
    vtable: &'tcx QueryVTable<'tcx, C>,
    key: C::Key,
) -> QueryStackFrame<QueryStackDeferred<'tcx>>
where
    C: QueryCache,
    C::Key: QueryKey + DynSend + DynSync,
    QueryVTable<'tcx, C>: DynSync,