How to cancel evaluating a required Ruby file? (a.k.a. top-level return)

Question

file1 requires file2, and I want to be able to cancel evaluating file2 under certain conditions without exiting the whole process.

Answer 1

UPDATE:

A "top-level return" feature has been added.

ORIGINAL:

Commenter matt pointed out that Feature 4840, which would do exactly what I'm asking about, has been in discussion since June 2011. Further, the feature was still being discussed as late as November 2015 in core team meetings regarding new Ruby features.

There are a lot of difficulties involved in designing a feature like this; for a list of the pros and cons, I highly suggest checking out the discussions.

The proposed feature would allow exiting the required file while using any of the the following top-level statements:

if condition
  return
end

while condition
  # ...
  return
end

begin
  # ...
  return
rescue
  # ...
  return
ensure
  # ...
  return
end

And it would not exit the required file in the following statements:

class Foo
  return # LocalJumpError
end

def foo
  return # returns from method, not from required file
end

proc do
  return # LocalJumpError
end

x = -> { return } # returns as from lambda, not from required file

Since the feature remains unimplemented, I have awarded the bounty to steenslag for successfully solving the problem (as originally written) to the letter, if not the spirit.