Resolve conflict with narray

[lokeshh]

Fixes #27

@v0dro Not sure but is this what you meant?

[v0dro]

Why is the build failing? Can you investigate? Your fix seems fine.

It's failing only for ruby 2.3

[lokeshh]

Seems like they removed obsolete Prime.new in Ruby 2.3 (see here).

I will look into this.

[lokeshh]

The problem is that this code from backports library fails to over write the class Prime.

I tried running Object.send(:remove_const, :Prime) before this line and it seems to work!

[v0dro]

Wow great :\

Could you add the following code somewhere in daru.rb?

if RUBY_VERSION > "2.3.0"
  Object.send(:remove_const, :Prime)
end

I think that should fix it.

[lokeshh]

The backports library just got updated. The bug doesn't seem to be there anymore.

The build should pass now.