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> How does one track memory leaks in a Lua application?

In 5.1 it's pretty easy to decide whether the leak is in Lua or in the
application: just define your own memry allocator and add/subtract the
amount of memory accordingly. At exit, print this total, which should be
zero if there is no leak in Lua.

See lauxlib for a memory allocator based on malloc. It should be simple to
add the instrumentation described above. So copy it and modify and call
lua_newstate with it.

For Mac OS X there are probably debugging memory allocators that you can
link to your program insted of malloc and these will probably give much
better information than the simple total.