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class C
attr_accessor :foo
end
long_lived = C.new
if RUBY_VERSION >= "2.2.0"
3.times{ GC.start(full_mark: false, immediate_mark: true, lazy_sweep: false) }
elsif
GC.start
end
i = 0
short_lived = ''
while i<30_000_000 # while loop 1
long_lived.foo = short_lived # write barrier
i+=1
end
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