From d7053b3237826dfd4055d565fde9be48b82d8796 Mon Sep 17 00:00:00 2001
From: Guillaume Dalle <22795598+gdalle@users.noreply.github.com>
Date: Thu, 5 Dec 2024 15:53:02 +0100
Subject: [PATCH] Even more manual diff

---
 DifferentiationInterfaceTest/src/scenarios/sparse.jl | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/DifferentiationInterfaceTest/src/scenarios/sparse.jl b/DifferentiationInterfaceTest/src/scenarios/sparse.jl
index afe9bacae..b3e2d552a 100644
--- a/DifferentiationInterfaceTest/src/scenarios/sparse.jl
+++ b/DifferentiationInterfaceTest/src/scenarios/sparse.jl
@@ -1,7 +1,11 @@
 ## Vector to vector
 
 function mydiff(x::AbstractVector)  # tmp fix for Enzyme
-    return x[2:end] .- x[1:(end - 1)]
+    y = similar(x, length(x) - 1)
+    for i in eachindex(y)
+        y[i] = x[i + 1] - x[i]
+    end
+    return y
 end
 
 diffsquare(x::AbstractVector)::AbstractVector = mydiff(x) .^ 2