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 0x7fad58048da0
freeing memory at 0x7fad5804fbc0
freeing memory at 0x7fad5804fc80
freeing memory at 0x7fad5804f5c0
freeing memory at 0x7fad5804f8e0
freeing memory at 0x7fad5804fc50
freeing memory at 0x7fad580079d0
freeing memory at 0x7fad5804edc0
freeing memory at 0x7fad5804fc30
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