ruby 'require' scope

a.rb

require_relative 'b'

Foo.new.foo

p ['Main in a.rb', $global, bar, Baz.qux]

b.rb

class Foo
  def foo
    require_relative 'c'
    p ['Foo#foo in b.rb', $global, bar, Baz.qux]
  end
end

c.rb

$global = 'global'

def bar
  'bar'
end

class Baz
  def self.qux
    'Baz.qux'
  end
end

zz_output.log

$ ruby -v a.rb
ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-linux]
["Foo#foo in b.rb", "global", "bar", "Baz.qux"]
["Main in a.rb", "global", "bar", "Baz.qux"]