Try Binding class

[ksss]

I'm trying to implement CRuby's Binding class.
Binding#local_variables is easy.
But I couldn't implement Binding#eval because it's too difficult.
It failed in this case.

class A
  class << self
    def b
      @a = 42
      b = 'local_variable'
      binding
    end
  end
end
p A.b.eval("[@a, b]")
# Expect: [42, "local_variable"]
# Actual(This branch): [42, []]

Does anyone have a good idea?

[take-cheeze]

Maybe recording the struct RProc* and pc of the previous stack frame could save the binding.

[dearblue]

@ksss, by saving the REnv object, the tests contained in your pull request will pass.
https://github.com/dearblue/mruby/tree/binding
This working branch is now the mruby HEAD (07224f8).
Is it possible for you to continue the work you are planning?

[ksss]

@dearblue Hi.
Thank you for finding this PR.
But I've forgotten what this PR is all about and I have no motivation to continue with it.
I'm glad. If you will take over this project.

[dearblue]

I see.
Perhaps there are some parts that can not be implemented due to mruby restrictions, but I will issue a new pull request someday by adding methods that are lacking compared to CRuby.
Thank you for your reply.

[dearblue]

I have implemented anything but Binding#irb and created a pull request as #5362.
If you have any concerns, please ask them there.

[ksss]

@dearblue Great Job!!!! 🎉