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 0x7f697404f600
freeing memory at 0x7f697404fc50
freeing memory at 0x7f697404ede0
freeing memory at 0x7f697404fca0
freeing memory at 0x7f697404f5e0
freeing memory at 0x7f69740079d0
freeing memory at 0x7f697404fc70
freeing memory at 0x7f697404f900
freeing memory at 0x7f697404fbe0
freeing memory at 0x7f6974048dc0
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