From 2a887ee04b944b4896533a195eb3cd4aa6e45757 Mon Sep 17 00:00:00 2001
From: David Widmann <devmotion@users.noreply.github.com>
Date: Mon, 23 Oct 2023 17:54:37 +0200
Subject: [PATCH] Collapse tuples of `nothing`

---
 src/adjoint.jl | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/adjoint.jl b/src/adjoint.jl
index 6255fe5..7fef6ea 100644
--- a/src/adjoint.jl
+++ b/src/adjoint.jl
@@ -21,6 +21,7 @@ for n = 0:3
   gradtuple = Symbol(:gradtuple, n)
   @eval begin
     $gradtuple(x::Tuple) = ($(ntuple(_->:nothing,n)...), x...)
+    $gradtuple(::Tuple{Vararg{Nothing}}) = nothing
     $gradtuple(x::Nothing) = nothing
     $gradtuple(x) = error("Gradient $x should be a tuple")
   end