1_8_7_Output.sh

$ ruby --version
ruby 1.8.7 (2011-06-30 patchlevel 352) [i686-darwin10.8.0]
$ ruby splat_args.rb
Arguments received by method:
arg_1: [1, 2, 3]
arg_2: []

Arguments received by class_exec:
arg_1: [1, 2, 3]
arg_2: []

Arguments received by instance_exec:
arg_1: [1, 2, 3]
arg_2: []

1_9_Output.sh

$ ruby --version
ruby 1.9.2p290 (2011-07-09 revision 32553) [x86_64-darwin10.8.0]
$ ruby splat_args.rb
Arguments received by method:
arg_1: [1, 2, 3]
arg_2: []

Arguments received by class_exec:
arg_1: 1
arg_2: [2, 3]

Arguments received by instance_exec:
arg_1: 1
arg_2: [2, 3]
$ rvm use 1.9.3
Using /Users/myron/.rvm/gems/ruby-1.9.3-preview1
$ ruby --version
ruby 1.9.3dev (2011-07-31 revision 32789) [x86_64-darwin10.8.0]
$ ruby splat_args.rb 
Arguments received by method:
arg_1: [1, 2, 3]
arg_2: []

Arguments received by class_exec:
arg_1: 1
arg_2: [2, 3]

Arguments received by instance_exec:
arg_1: 1
arg_2: [2, 3]

splat_args.rb

def foo(arg_1, *arg_2)
  puts "Arguments received by method:"
  puts "arg_1: #{arg_1.inspect}"
  puts "arg_2: #{arg_2.inspect}"
end
foo([1, 2, 3])

puts

Class.class_exec([1, 2, 3]) do |arg_1, *arg_2|
  puts "Arguments received by class_exec:"
  puts "arg_1: #{arg_1.inspect}"
  puts "arg_2: #{arg_2.inspect}"
end

puts

instance_exec([1, 2, 3]) do |arg_1, *arg_2|
  puts "Arguments received by instance_exec:"
  puts "arg_1: #{arg_1.inspect}"
  puts "arg_2: #{arg_2.inspect}"
end