From a87a4821b65f07e6fd9681c26e71b3190e0e4c8b Mon Sep 17 00:00:00 2001
From: chriselrod <elrodc@gmail.com>
Date: Tue, 8 Aug 2023 21:34:00 -0400
Subject: [PATCH] convert for nested duals sharing tags

---
 Project.toml     | 2 +-
 src/dual.jl      | 1 +
 test/DualTest.jl | 2 ++
 3 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/Project.toml b/Project.toml
index ee450fc6..f7c66517 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,6 +1,6 @@
 name = "ForwardDiff"
 uuid = "f6369f11-7733-5829-9624-2563aa707210"
-version = "0.10.35"
+version = "0.10.36"
 
 [deps]
 CommonSubexpressions = "bbf7d656-a473-5ed7-a52c-81e309532950"
diff --git a/src/dual.jl b/src/dual.jl
index c0fb4744..5afb2144 100644
--- a/src/dual.jl
+++ b/src/dual.jl
@@ -431,6 +431,7 @@ for R in (Irrational, Real, BigFloat, Bool)
 end
 
 @inline Base.convert(::Type{Dual{T,V,N}}, d::Dual{T}) where {T,V,N} = Dual{T}(V(value(d)), convert(Partials{N,V}, partials(d)))
+@inline Base.convert(::Type{Dual{T,Dual{T,V,M},N}}, d::Dual{T,V,M}) where {T,V,N,M} = Dual{T}(d, Partials{N,Dual{T,V,M}}(zero_tuple(NTuple{N,Dual{T,V,M}})))
 @inline Base.convert(::Type{Dual{T,V,N}}, x) where {T,V,N} = Dual{T}(V(x), zero(Partials{N,V}))
 @inline Base.convert(::Type{Dual{T,V,N}}, x::Number) where {T,V,N} = Dual{T}(V(x), zero(Partials{N,V}))
 Base.convert(::Type{D}, d::D) where {D<:Dual} = d
diff --git a/test/DualTest.jl b/test/DualTest.jl
index be3ea25a..8d87f90b 100644
--- a/test/DualTest.jl
+++ b/test/DualTest.jl
@@ -603,6 +603,8 @@ end
     @test typeof(dfmax) === typeof(d1)
     @test isfinite(dfmin)
     @test isfinite(dfmax)
+
+  @test floatmin(Dual{Nothing, ForwardDiff.Dual{Nothing, Float64, 2}, 1}) === Dual{Nothing}(Dual{Nothing}(floatmin(Float64),0.0,0.0),Dual{Nothing}(0.0,0.0,0.0))
 end
 
 @testset "Integer" begin