From 678b9a96a833f05d6f807b244f6afe016f48cfed Mon Sep 17 00:00:00 2001
From: Simeon David Schaub <schaub@mit.edu>
Date: Sun, 8 Oct 2023 17:17:08 +0200
Subject: [PATCH] fix case of unknown extents

---
 src/arrays.jl | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/arrays.jl b/src/arrays.jl
index bfd06b46f..3d71a62a3 100644
--- a/src/arrays.jl
+++ b/src/arrays.jl
@@ -215,7 +215,9 @@ function make_shape(output_idx, expr, ranges=Dict())
             end
             mi = matches[i]
             @assert !isempty(mi)
-            return Base.OneTo(length(get_extents(mi)))
+            ext = get_extents(mi)
+            ext isa Unknown && return Unknown()
+            return Base.OneTo(length(ext))
         elseif i isa Integer
             return Base.OneTo(1)
         end