REE leaks memory when handling big strings. Run this script with ruby ree and string_size >= 7 to see it.

ree memory leaks

### usage : ruby(version) mem.rb STRING_SIZE [cow]

###  1 < string_size < 9 

### cow to activate copy on write (ree only)

def ram_usage
  `pmap #{Process.pid} | tail -1`.split[1][0..-2].to_i
end

def gc_and_log(message, allocate, free)
  b = ram_usage
  puts format("Running test %s", message)
  puts format("Before allocation : %sk", b)
  puts "Allocating ..."
  allocate.call
  puts format("After allocation, before GC : %sk", ram_usage)
  free.call
  GC.start
  a = ram_usage
  puts format("After GC : %sk -- %sk leaked", a, a - b)
  puts
end

SIZE = ARGV.pop.to_i

if GC.respond_to?(:copy_on_write_friendly=) and ARGV.pop == "cow"
  puts "enabling REE copy on write"
  GC.copy_on_write_friendly = true
end

t = []
gc_and_log("10**#{SIZE} abc strings",
           lambda { 10**SIZE.times {|i| t[i] = "abc"} },
           lambda { t = nil })


a = ""
gc_and_log("single 10**#{SIZE} times abc long string",
           lambda { a = "abc" * (10**SIZE) },
           lambda { a = nil })


puts "press enter to quit"
gets