Update DSL blog post for Julia 1.0

[alecloudenback]

This post
has code that no longer works, and I am assuming that it was during the Julia 0.6 -> Julia 1.0 transition.

Would a pull request to update the post for Julia 1.0 be accepted?

I posted on Slack and Syx Pek helped by showing an updated final example that I would follow to redo the non-working code in the full post:

module Models2
       export Model, @model
       struct Model{F}
           f::F
       end
       (m::Model)(x) = m.f(x)
       function make_function(ex::Expr)
           return esc(:(x -> $ex))
       end
       function make_model(ex::Expr)
           return :(Model($ex))
       end
       macro model(ex)
           return make_model(make_function(ex))
       end
end

[ViralBShah]

Yes, it would be great to have a PR.

[ViralBShah]

Bump.

[alecloudenback]

I started to do this but got kind of hung up because it was more than just updating syntax.

It seems like some of the blog post's points about macro hygiene have been changed in the transition to 1.0... As I was using this blog post as an intro into learning macros, I'm not well positioned to revamp some of the points.

[ViralBShah]

@dpsanders I think this is an older post of yours. Would it be possible for you to update it?

[dpsanders]

Yes it's mine. When I have a moment free...

[ViralBShah]

Bump @dpsanders