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 0x3ff6c066c60
freeing memory at 0x3ff6c068d90
freeing memory at 0x3ff6c068e20
freeing memory at 0x3ff6c068710
freeing memory at 0x3ff6c0663a0
freeing memory at 0x3ff6c0663c0
freeing memory at 0x3ff6c05e230
freeing memory at 0x3ff6c0663e0
freeing memory at 0x3ff6c0686f0
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