Ruby local scoping: when exceptions happen or not.

gistfile1.txt

def a
  # Should error because it's not assigned in the current scope.
  puts foobar
end

def b
  # This code path isn't run but it's still in the same scope.
  if false
    foobar = 123
  end

  # Should print nil
  puts foobar
end

def c
  # Looky, new scope!
  proc do
    foobar = 123
  end

  # Should error
  puts foobar
end

begin; a; rescue Exception => e; puts "ERROR: #{e.message}"; end # Should error
begin; b; rescue Exception => e; puts "ERROR: #{e.message}"; end # => nil
begin; c; rescue Exception => e; puts "ERROR: #{e.message}"; end # Should error

# Interesting related links:
# http://stackoverflow.com/questions/4154864/i-dont-understand-ruby-local-scope
# http://stackoverflow.com/questions/4021477/in-ruby-why-after-starting-irb-foo-nil-says-undefined-error-and-foo-nil-gi