patchy.rb

#!/usr/bin/env ruby192
def try(it)
  puts "# '#{it}' in four rubies"
  puts
  {
    "1.9.2'" => 'ruby192',
    "1.9.1" => 'ruby191',
    "1.8.7" => '/opt/local/bin/ruby',
    "1.8.6" => '/usr/bin/ruby'
  }.each do |k, v|
    system "#{v} -e 'p(#{it})' >& tmptmptmp.txt"
    puts "## in #{k}"
    puts File.read "tmptmptmp.txt"
  end
end

DATA.each_line {|l|
  try(l.chomp)
  puts
}
__END__
{}
{1 => 2}
{1}
{|x| 1 }
{ p 1 => 2 }
{ p(1) => 2 }
{ p(1 => 2) }
{ p {} => {} }
{p:p}
{ p, p = 1, 2, 3 }
p { 1 }
p({ 1 })