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 0x7f114006a210
freeing memory at 0x7f114005f3f0
freeing memory at 0x7f114006a230
freeing memory at 0x7f1140069180
freeing memory at 0x7f11400639d0
freeing memory at 0x7f1140063bf0
freeing memory at 0x7f1140066c50
freeing memory at 0x7f1140063bc0
freeing memory at 0x7f11400639f0
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