If a foreign pointer object corresponds to memory that was not allocated by the GC garbage collector, then a function to properly deallocate this memory when the Pointer object that stores this pointer is garbage collected should be called. The function should take a single argument, a foreign object, typically of type voidstar, which corresponds to the memory to deallocate.
i1 : malloc = foreignFunction("malloc", voidstar, ulong)
o1 = malloc
o1 : ForeignFunction
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i2 : free = foreignFunction("free", void, voidstar)
o2 = free
o2 : ForeignFunction
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i3 : finalizer = x -> (print("freeing memory at " | net x); free x)
o3 = finalizer
o3 : FunctionClosure
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i4 : for i to 9 do (x := malloc 8; registerFinalizer(x, finalizer))
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i5 : collectGarbage()
freeing memory at 0x73740c067050
freeing memory at 0x73740c063ff0
freeing memory at 0x73740c063df0
freeing memory at 0x73740c06a610
freeing memory at 0x73740c063fc0
freeing memory at 0x73740c05f7f0
freeing memory at 0x73740c06a630
freeing memory at 0x73740c063dd0
freeing memory at 0x73740c069580
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