possible test failure in upcoming Julia version 1.5

[rfourquet]

A PkgEval run for a PR which changes the generated numbers for randn! indicates that the tests of this package might fail in Julia 1.5 (and on Julia current master). Apologies if this is a false positive.
cf. https://github.com/JuliaCI/NanosoldierReports/blob/7de24e455342298cbef56826b5827f0d7640d2c1/pkgeval/by_hash/b89e35c_vs_098ef24/logs/CausalInference/1.5.0-DEV-71a4a114c2.log

[mschauer]

Do we have an easy way to access the old random number generator?

[rfourquet]

I'm afraid not. One (temporary) solution for tests might be to redefine the old randn!, e.g.

function Base.randn!(rng::MersenneTwister, A::Array{Float64}) 
    for i in eachindex(A)
        @inbounds A[i] = randn(rng, Float64)
    end
    A
end

Also, for future immunity you might like to try https://github.com/rfourquet/StableRNGs.jl :)