normalize! generated function error in Documenter build

[jkrumbiegel]

I'm getting this error in an @example block in a Documenter build on Github Actions only, but not locally when running the same code. The code is just fitting a histogram at some point.

On Statsbase v0.33.2 and Documenter v0.26.1, Julia nightly - ubuntu-latest - x64

The function body AST defined by this @generated function is not pure. This likely means it contains a closure or comprehension.
Stacktrace:
  [1] #normalize#151
    @ ~/.julia/packages/StatsBase/EA8Mh/src/hist.jl:510 [inlined]
  [2] (::AbstractPlotting.var"#644#648"{Observable{Vector{Float64}}})(edges::StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}}, normalization::Symbol)
    @ AbstractPlotting ~/work/AbstractPlotting.jl/AbstractPlotting.jl/src/stats/hist.jl:61

[nalimilan]

Most likely fixed by #656.