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[Bug #19550] If !RCLASS_EXT_EMBEDDED (e.g. 32 bit systems) then the rb_classext_t is allocated throug malloc so it must be freed. The issue can be seen in the following script: ``` 20.times do 100_000.times do mod = Module.new Class.new do include mod end end # Output the Resident Set Size (memory usage, in KB) of the current Ruby process puts `ps -o rss= -p #{$$}` end ``` Before this fix, the max RSS is 280MB, while after this change, it's 30MB.
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