gistfile1.txt

[subbu@earth /tmp] cat y.rb
require 'x'

C.boo

eval 'p x', TOPLEVEL_BINDING
[subbu@earth /tmp] 
[subbu@earth /tmp] cat x.rb
x = 1
p "--1--"
eval "p x"

def foo
  p "--2--"
  eval "p x", TOPLEVEL_BINDING
end
       
foo

class C
  class << self
    p "--3--"
    eval "p x", TOPLEVEL_BINDING
  end
end
[subbu@earth /tmp] cat y.rb
require 'x'

C.boo

eval 'p x', TOPLEVEL_BINDING
[subbu@earth /tmp] mri -I. y.rb
"--1--"
1
"--2--"
<main>:in `<main>': undefined local variable or method `x' for main:Object (NameError)
	from /tmp/x.rb:7:in `eval'
	from /tmp/x.rb:7:in `foo'
	from /tmp/x.rb:10:in `<top (required)>'
	from /home/subbu/.rvm/rubies/ruby-head/lib/ruby/site_ruby/2.2.0/rubygems/custom_require.rb:36:in `require'
	from /home/subbu/.rvm/rubies/ruby-head/lib/ruby/site_ruby/2.2.0/rubygems/custom_require.rb:36:in `require'
	from y.rb:1:in `<main>'
[subbu@earth /tmp] jruby -X-C -I. y.rb
"--1--"
1
"--2--"
NameError: undefined local variable or method `x' for main:Object
      foo at :1
     eval at org/jruby/RubyKernel.java:962
      foo at /tmp/x.rb:7
   (root) at /tmp/x.rb:10
  require at org/jruby/RubyKernel.java:926
   (root) at /home/subbu/jruby/lib/ruby/shared/rubygems/core_ext/kernel_require.rb:1
  require at /home/subbu/jruby/lib/ruby/shared/rubygems/core_ext/kernel_require.rb:55
[subbu@earth /tmp] 
[subbu@earth /tmp] jruby -X-C -I. x.rb
"--1--"
1
"--2--"
1
"--3--"
1
[subbu@earth /tmp] mri -I. x.rb
"--1--"
1
"--2--"
1
"--3--"
1