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 0x7f702804fbe0
freeing memory at 0x7f702804f5e0
freeing memory at 0x7f70280079d0
freeing memory at 0x7f702804fc50
freeing memory at 0x7f702804fc70
freeing memory at 0x7f702804f900
freeing memory at 0x7f7028048dc0
freeing memory at 0x7f702804fca0
freeing memory at 0x7f702804ede0
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