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 0x7d4098063dd0
freeing memory at 0x7d4098069580
freeing memory at 0x7d4098067050
freeing memory at 0x7d4098063fc0
freeing memory at 0x7d409805f7f0
freeing memory at 0x7d4098063df0
freeing memory at 0x7d409806a610
freeing memory at 0x7d409806a630
freeing memory at 0x7d4098063ff0
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