Constant functions error
- Dominant language
- Julia
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Description
```julia
julia> Tracker.gradient((x)->(1.0), [0.5])
ERROR: MethodError: no method matching back!(::Float64)
Closest candidates are:
back!(::Any, ::Any; once) at C:\Users\user\.julia\packages\Tracker\SAr25\src\back.jl:75
back!(::Tracker.TrackedReal; once) at C:\Users\user\.julia\packages\Tracker\SAr25\src\lib\real.jl:14
back!(::TrackedArray) at C:\Users\user\.julia\packages\Tracker\SAr25\src\lib\array.jl:68
Stacktrace:
[1] gradient_(::Function, ::Array{Float64,1}) at C:\Users\user\.julia\packages\Tracker\SAr25\src\back.jl:4
[2] #gradient#24 at C:\Users\user\.julia\packages\Tracker\SAr25\src\back.jl:164 [inlined]
[3] gradient(::Function, ::Array{Float64,1}) at C:\Users\user\.julia\packages\Tracker\SAr25\src\back.jl:164
[4] top-level scope at none:0
```
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