From 5b850f78752a7660dea47b877056f0b85f3d41ed Mon Sep 17 00:00:00 2001
From: David Widmann <david.widmann@it.uu.se>
Date: Fri, 6 May 2022 11:07:10 +0200
Subject: [PATCH 1/3] Add definition for `logabsgamma`

---
 Project.toml     | 2 +-
 src/dual.jl      | 9 +++++++++
 test/DualTest.jl | 2 ++
 3 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/Project.toml b/Project.toml
index 9dfe8592..cb0abdb0 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,6 +1,6 @@
 name = "ForwardDiff"
 uuid = "f6369f11-7733-5829-9624-2563aa707210"
-version = "0.10.28"
+version = "0.10.29"
 
 [deps]
 CommonSubexpressions = "bbf7d656-a473-5ed7-a52c-81e309532950"
diff --git a/src/dual.jl b/src/dual.jl
index c3dc48a0..999c4a55 100644
--- a/src/dual.jl
+++ b/src/dual.jl
@@ -742,6 +742,15 @@ function LinearAlgebra.eigen(A::SymTridiagonal{<:Dual{Tg,T,N}}) where {Tg,T<:Rea
     Eigen(λ,Dual{Tg}.(Q, tuple.(parts...)))
 end
 
+# SpecialFunctions.logabsgamma           #
+# Derivative is not defined in DiffRules #
+#----------------------------------------#
+
+function SpecialFunctions.logabsgamma(d::Dual{T,<:Real}) where {T}
+    x = value(d)
+    y, s = SpecialFunctions.logabsgamma(x)
+    return (Dual{T}(y, SpecialFunctions.digamma(x) * partials(d)), s)
+end
 
 ###################
 # Pretty Printing #
diff --git a/test/DualTest.jl b/test/DualTest.jl
index fd5ac210..21dd9e0d 100644
--- a/test/DualTest.jl
+++ b/test/DualTest.jl
@@ -539,6 +539,8 @@ for N in (0,3), M in (0,4), V in (Int, Float32)
         @test dual_isapprox(f(FDNUM, PRIMAL2, PRIMAL3), Dual{TestTag()}(f(PRIMAL, PRIMAL2, PRIMAL3), PRIMAL2*PARTIALS))
         @test dual_isapprox(f(PRIMAL, PRIMAL2, FDNUM3), Dual{TestTag()}(f(PRIMAL, PRIMAL2, PRIMAL3), PARTIALS3))
     end
+
+    @test all(map(dual_isapprox, logabsgamma(FDNUM), (loggamma(abs(FDNUM)), sign(gamma(FDNUM)))))
 end
 
 @testset "Exponentiation of zero" begin

From 271ffff3e40e9dbb947374f8384f0611a3e6775c Mon Sep 17 00:00:00 2001
From: David Widmann <devmotion@users.noreply.github.com>
Date: Sat, 14 May 2022 23:18:13 +0200
Subject: [PATCH 2/3] Update test/DualTest.jl

Co-authored-by: Frames Catherine White <oxinabox@ucc.asn.au>
---
 test/DualTest.jl | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/test/DualTest.jl b/test/DualTest.jl
index 21dd9e0d..66a1866a 100644
--- a/test/DualTest.jl
+++ b/test/DualTest.jl
@@ -540,7 +540,8 @@ for N in (0,3), M in (0,4), V in (Int, Float32)
         @test dual_isapprox(f(PRIMAL, PRIMAL2, FDNUM3), Dual{TestTag()}(f(PRIMAL, PRIMAL2, PRIMAL3), PARTIALS3))
     end
 
-    @test all(map(dual_isapprox, logabsgamma(FDNUM), (loggamma(abs(FDNUM)), sign(gamma(FDNUM)))))
+    @test dual_isapprox(logabsgamma(FDNUM)[1], loggamma(abs(FDNUM)))
+    @test dual_isapprox(logabsgamma(FDNUM)[2], sign(gamma(FDNUM)))
 end
 
 @testset "Exponentiation of zero" begin

From 5b9c038871fb6f1f354db1465aa013bf92af6d51 Mon Sep 17 00:00:00 2001
From: David Widmann <devmotion@users.noreply.github.com>
Date: Thu, 19 May 2022 01:35:43 +0200
Subject: [PATCH 3/3] Update Project.toml

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

diff --git a/Project.toml b/Project.toml
index cb0abdb0..2930dc3b 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,6 +1,6 @@
 name = "ForwardDiff"
 uuid = "f6369f11-7733-5829-9624-2563aa707210"
-version = "0.10.29"
+version = "0.10.30"
 
 [deps]
 CommonSubexpressions = "bbf7d656-a473-5ed7-a52c-81e309532950"