#!/usr/bin/julia

struct Aa
  train!::Function
end

function createa()
  x::Vector{T} where T<:Real = fill(NaN,0)

  train = () -> begin
    a = zeros(1, 100)

    x = ones(size(a,2)-1)
    a * vcat(x, 1)
    return x
  end

  Aa(train)
end

a = createa()
a.train!()