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 0x7f6514068230
freeing memory at 0x7f65140681d0
freeing memory at 0x7f6514065a90
freeing memory at 0x7f6514068480
freeing memory at 0x7f65140681f0
freeing memory at 0x7f6514068b20
freeing memory at 0x7f6514068460
freeing memory at 0x7f6514068210
freeing memory at 0x7f6514068a60
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