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 0x7f441804e990
freeing memory at 0x7f441804f790
freeing memory at 0x7f441804f4b0
freeing memory at 0x7f441804f820
freeing memory at 0x7f441804f800
freeing memory at 0x7f4418004af0
freeing memory at 0x7f4418048970
freeing memory at 0x7f441804f190
freeing memory at 0x7f441804f850
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