Hiding the Parenthesize Warning in Ruby

If you execute the sample code for the Executing an internal DSL in multiple contexts entry you will see results similar to this:

Context One:
(eval):1: warning: parenthesize argument(s) for future version
(eval):1: warning: parenthesize argument(s) for future version
(eval):1: warning: parenthesize argument(s) for future version
(eval):1: warning: parenthesize argument(s) for future version
(eval):1: warning: parenthesize argument(s) for future version
(eval):1: warning: parenthesize argument(s) for future version
(eval):1: warning: parenthesize argument(s) for future version
(eval):1: warning: parenthesize argument(s) for future version
$5-$10 Limit
  action open
  position floor
...

The code was just sample code so I wasn't very concerned with hiding the warnings; however, since several people asked how to do it I thought I'd do a quick follow up entry.

The code required to silence warnings can be found in the Rails framework (activesupport/lib/active_support/core_ext/kernel/reporting).

module Kernel
  def silence_warnings
    old_verbose, $VERBOSE = $VERBOSE, nil
    yield
  ensure
    $VERBOSE = old_verbose
  end
end

After adding the above code to your codebase (or, if you are writing a Rails app it's already included) you can execute your code as a block to silence_warnings and no warnings will be shown.

silence_warnings do
  puts "\nContext One:"
  ContextOne.execute(script) do |notification|
    Broadcast.notify(*notification)
  end

  puts "\nContext Two:"
  ContextTwo.execute(script) do |stakes|
    puts ContextTwo.sym_to_stakes(stakes)
  end

  puts "\nContext Three"
  ContextThree.execute(script) do |positions|
    puts positions
  end
end

The results are much quieter after silencing the warnings

Context One:
$5-$10 Limit
  action open
  position floor
$1-$2 No Limit
  action open
  position floor
$5-$10 Limit
  action announce
  position brush
$1-$2 No Limit
  action announce
  position brush

Context Two:
$5-$10 Limit
$1-$2 No Limit
$5-$10 Limit
$1-$2 No Limit

Context Three
floor
floor
brush
brush

Updated Sample Code