From 6bbed07e96048503fad3dfd9dd3000b37781506c Mon Sep 17 00:00:00 2001
From: Mike J Innes <mike.j.innes@gmail.com>
Date: Fri, 7 Sep 2018 02:05:03 +0100
Subject: [PATCH] enable nested broadcast

---
 src/tracker/array.jl | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/tracker/array.jl b/src/tracker/array.jl
index ffa3a89e..16f91d22 100644
--- a/src/tracker/array.jl
+++ b/src/tracker/array.jl
@@ -351,9 +351,9 @@ end
   eltype(y) <: Real || return y
   eltype(y) == Bool && return y
   function back(Δ)
-    Δargs = ntuple(i -> partial.(f, data(Δ), i, args...), Val(N))
-    dxs = unbroadcast.(args, Δargs)
-    return nobacksies(:broadcast, dxs)
+    Δargs = ntuple(i -> partial.(f, Δ, i, args...), Val(N))
+    dxs = map(unbroadcast, args, Δargs)
+    return dxs
   end
   # So we can return non-tracked arrays
   track(Call(back, tracker.(args)), y)