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gradients of hessians with divisions #285

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@simonbyrne

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@simonbyrne

I can't figure this one out. When I try in the debugger or with --inline=no, it works correctly!

julia> using ForwardDiff

julia> ForwardDiff.gradient([1.0]) do s
           ForwardDiff.hessian(u -> u[1]/s[1], [1.0])[1]
       end
ERROR: MethodError: Cannot `convert` an object of type ForwardDiff.Dual{ForwardDiff.Tag{##1#3,Float64},Float64,1} to an object of type Float64
This may have arisen from a call to the constructor Float64(...),
since type constructors fall back to convert methods.
Stacktrace:
 [1] convert(::Type{ForwardDiff.Dual{ForwardDiff.Tag{##1#3,Float64},ForwardDiff.Dual{ForwardDiff.Tag{##2#4{Array{ForwardDiff.Dual{ForwardDiff.Tag{##1#3,Float64},Float64,1},1}},Float64},Float64,1},1}}, ::ForwardDiff.Dual{ForwardDiff.Tag{##2#4{Array{ForwardDiff.Dual{ForwardDiff.Tag{##1#3,Float64},Float64,1},1}},Float64},ForwardDiff.Dual{ForwardDiff.Tag{##1#3,Float64},Float64,1},1}) at /Users/simon/.julia/v0.6/ForwardDiff/src/dual.jl:314
 [2] convert(::Type{Tuple{ForwardDiff.Dual{ForwardDiff.Tag{##1#3,Float64},ForwardDiff.Dual{ForwardDiff.Tag{##2#4{Array{ForwardDiff.Dual{ForwardDiff.Tag{##1#3,Float64},Float64,1},1}},Float64},Float64,1},1}}}, ::Tuple{ForwardDiff.Dual{ForwardDiff.Tag{##2#4{Array{ForwardDiff.Dual{ForwardDiff.Tag{##1#3,Float64},Float64,1},1}},Float64},ForwardDiff.Dual{ForwardDiff.Tag{##1#3,Float64},Float64,1},1}}) at ./essentials.jl:135
 [3] / at /Users/simon/.julia/v0.6/ForwardDiff/src/dual.jl:99 [inlined]
...

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