I'm making a Befunge interpreter in Ruby - I like to keep my brain
active. I want to be able to switch between different sets of rules, so
as well as my base program befunge.rb, I've got a file called
befunge-93.rb that contains the Befunge-93 specification. Like so:

befunge.rb
---
instructions = {}
require 'befunge-93'
---

befunge-93.rb
---
instructions = {}
instructions["+"] = lambda { |a, b| stack.push a+b }
instructions["-"] = lambda { |a, b| stack.push b-a }
more instructions, snipped.
---

I do the 'instructions = {}' line twice, as it curls up and dies without
it. But after I've included the instructions file, instructions is still
{}. This hints at the fact that it's not letting me use the instructions
variable across the file.

Is there any way to do this? I *could* do something like:
File.open("befunge-93.rb").each { |instruction| eval(instruction }

But it that's a valid solution, then I'm Tony Blair.
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