Compute functions on a grid of parameters

General Usage
12

The following does not work yet, but shows you Roughly what Base.Cartesian will get you

using MacroTools
using Base.Cartesian: @nexprs, @nloops
# @generated function many(n::NTuple{N,T}) where {N,T} # Put in a generated function like this to have it compile automatically
ex1 = @macroexpand @nextract 5 f input
ex2 = @macroexpand @nloops 5 i n->1:r_n d -> fval_d = f_d(a_{d+1}, a_d) begin
    println(i_1,i_2,i_3)
end

prettify(Expr(:block, ex1,ex2)) |> display

quote
    f_1 = input[1]
    f_2 = input[2]
    f_3 = input[3]
    f_4 = input[4]
    f_5 = input[5]
    for i_5 = 1:r_5
        fval_5 = f_5(a_6, a_5)
        for i_4 = 1:r_4
            fval_4 = f_4(a_5, a_4)
            for i_3 = 1:r_3
                fval_3 = f_3(a_4, a_3)
                for i_2 = 1:r_2
                    fval_2 = f_2(a_3, a_2)
                    for i_1 = 1:r_1
                        fval_1 = f_1(a_2, a_1)
                        println(i_1, i_2, i_3)
                        nothing
                    end
                    nothing
                end
                nothing
            end
            nothing
        end
        nothing
    end
end
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