From f78f2416ba0b851dd066ec7cb533e2673b5194db Mon Sep 17 00:00:00 2001
From: Michael Abbott <32575566+mcabbott@users.noreply.github.com>
Date: Thu, 1 Sep 2022 13:29:45 -0400
Subject: [PATCH 1/3] real(z::AbstractZero)

---
 src/tangent_arithmetic.jl | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/tangent_arithmetic.jl b/src/tangent_arithmetic.jl
index 439f0ac8f..e2ab31a82 100644
--- a/src/tangent_arithmetic.jl
+++ b/src/tangent_arithmetic.jl
@@ -108,8 +108,7 @@ for T in (:AbstractThunk, :Tangent, :Any)
     @eval LinearAlgebra.dot(::$T, ::ZeroTangent) = ZeroTangent()
 end
 
-Base.real(::ZeroTangent) = ZeroTangent()
-Base.imag(::ZeroTangent) = ZeroTangent()
+Base.real(z::AbstractZero) = z
 
 Base.complex(::ZeroTangent) = ZeroTangent()
 Base.complex(::ZeroTangent, ::ZeroTangent) = ZeroTangent()

From 7abec81199a80901f2377c34868fac35322ccd3c Mon Sep 17 00:00:00 2001
From: Michael Abbott <32575566+mcabbott@users.noreply.github.com>
Date: Thu, 1 Sep 2022 13:33:41 -0400
Subject: [PATCH 2/3] 1.15.4

---
 Project.toml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Project.toml b/Project.toml
index 3b97c30ab..ee5cf560d 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,6 +1,6 @@
 name = "ChainRulesCore"
 uuid = "d360d2e6-b24c-11e9-a2a3-2a2ae2dbcce4"
-version = "1.15.3"
+version = "1.15.4"
 
 [deps]
 Compat = "34da2185-b29b-5c13-b0c7-acf172513d20"

From 97775f50e2efc0bf1bc2b7dc9c492ea3f85f7989 Mon Sep 17 00:00:00 2001
From: Michael Abbott <32575566+mcabbott@users.noreply.github.com>
Date: Thu, 1 Sep 2022 16:10:37 -0400
Subject: [PATCH 3/3] don't delete imag

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

diff --git a/src/tangent_arithmetic.jl b/src/tangent_arithmetic.jl
index e2ab31a82..9e6b6eb21 100644
--- a/src/tangent_arithmetic.jl
+++ b/src/tangent_arithmetic.jl
@@ -109,6 +109,7 @@ for T in (:AbstractThunk, :Tangent, :Any)
 end
 
 Base.real(z::AbstractZero) = z
+Base.imag(z::AbstractZero) = z
 
 Base.complex(::ZeroTangent) = ZeroTangent()
 Base.complex(::ZeroTangent, ::ZeroTangent) = ZeroTangent()