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 0xffff70068750
freeing memory at 0xffff70066ca0
freeing memory at 0xffff7000de30
freeing memory at 0xffff70068730
freeing memory at 0xffff70066400
freeing memory at 0xffff70066420
freeing memory at 0xffff700663e0
freeing memory at 0xffff70068dd0
freeing memory at 0xffff70068e60
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