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 0x7fff4804f610
freeing memory at 0x7fff4804f8e0
freeing memory at 0x7fff48050090
freeing memory at 0x7fff4804fec0
freeing memory at 0x7fff4804f690
freeing memory at 0x7fff4804f8c0
freeing memory at 0x7fff4804ff80
freeing memory at 0x7fff4804f0a0
freeing memory at 0x7fff4804f000
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