https://github.com/FluxML/Tracker.jl/commit/f6550ba38a9ea5802e2de4fa9c939929ba711f0d.patch
from an upstream pull request
https://github.com/FluxML/Tracker.jl/pull/94


From f6550ba38a9ea5802e2de4fa9c939929ba711f0d Mon Sep 17 00:00:00 2001
From: Michael Abbott <me@escbook>
Date: Wed, 3 Feb 2021 22:58:33 +0100
Subject: [PATCH] two fixes for 1.6

---
 src/lib/array.jl | 2 +-
 src/lib/real.jl  | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/lib/array.jl b/src/lib/array.jl
index 92f2b39..f8cbbac 100644
--- a/src/lib/array.jl
+++ b/src/lib/array.jl
@@ -298,7 +298,7 @@ Base.reverse(xs::TrackedArray; dims) = track(reverse, xs, dims = dims)
 @grad reverse(xs; dims) = reverse(data(xs), dims = dims), Δ -> (reverse(Δ, dims = dims), nothing)
 Base.reverse(xs::TrackedVector) = track(reverse, xs)
 @grad reverse(xs::TrackedVector) = reverse(data(xs)), Δ -> (reverse(Δ),)
-Base.reverse(xs::TrackedVector, start, stop) = track(reverse, xs, start, stop)
+Base.reverse(xs::TrackedVector, start::Integer, stop::Integer) = track(reverse, xs, start, stop)
 @grad reverse(xs, start, stop) = reverse(data(xs), start, stop), Δ -> (reverse(Δ, start, stop), nothing, nothing)
 
 function _kron(mat1::AbstractMatrix,mat2::AbstractMatrix)
diff --git a/src/lib/real.jl b/src/lib/real.jl
index 737afd8..e1975ac 100644
--- a/src/lib/real.jl
+++ b/src/lib/real.jl
@@ -55,6 +55,7 @@ for f in :[isinf, isnan, isfinite].args
 end
 
 Printf.fix_dec(x::TrackedReal, n::Int, a...) = Printf.fix_dec(data(x), n, a...)
+Printf.tofloat(x::TrackedReal) = Printf.tofloat(data(x))
 
 Base.float(x::TrackedReal) = x
 
dden' name='id' value='9fcd51280f2a3bde8d9fcf6615eb8b8cda44f310'/><select name='qt'>
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<div class='path'>path: <a href='/guix/log/?id=9fcd51280f2a3bde8d9fcf6615eb8b8cda44f310'>root</a>/<a href='/guix/log/gnu?id=9fcd51280f2a3bde8d9fcf6615eb8b8cda44f310'>gnu</a>/<a href='/guix/log/gnu/services?id=9fcd51280f2a3bde8d9fcf6615eb8b8cda44f310'>services</a>/<a href='/guix/log/gnu/services/vnc.scm?id=9fcd51280f2a3bde8d9fcf6615eb8b8cda44f310'>vnc.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/services/vnc.scm?id=9fcd51280f2a3bde8d9fcf6615eb8b8cda44f310&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2023-04-02 23:35:15 -0400'>2023-04-02</span></td><td><a href='/guix/commit/gnu/services/vnc.scm?id=1d0158ab9036cff7737cbfb1678f876ae67c4ac2'>services: xvnc: Do not create a regular HOME directory for xvnc user.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/vnc.scm (%xvnc-accounts)
[home-directory]: Define as /var/empty.
[shell]: Set to nologin, for good measures.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2022-10-07 15:07:48 -0400'>2022-10-07</span></td><td><a href='/guix/commit/gnu/services/vnc.scm?id=00e843050012961e9cc41b003ea9271eab718541'>Revert "Revert "services: Add xvnc-service-type.""</a><span class='msg-avail'>...<span class='msg-tooltip'>This reverts commit 0c4966160054bc50e6ab3a4ac9c9a6a1826ab5a0.  The fix appears
in the subsequent commit, for clarity.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2022-10-07 12:53:22 -0400'>2022-10-07</span></td><td><a href='/guix/commit/gnu/services/vnc.scm?id=0c4966160054bc50e6ab3a4ac9c9a6a1826ab5a0'>Revert "services: Add xvnc-service-type."</a><span class='msg-avail'>...<span class='msg-tooltip'>This reverts commit 1c528a95cb92b7808e6603d7956185005583629f.  This broke
'guix pull', for (yet) unknown reasons.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2022-10-07 10:11:13 -0400'>2022-10-07</span></td><td><a href='/guix/commit/gnu/services/vnc.scm?id=1c528a95cb92b7808e6603d7956185005583629f'>services: Add xvnc-service-type.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/vnc.scm: New file.
* gnu/tests/vnc.scm: Likewise.
* gnu/local.mk: Register them.
</span></span></td><td>Maxim Cournoyer</td></tr>