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 0x7f9f0c066620
freeing memory at 0x7f9f0c067f40
freeing memory at 0x7f9f0c05df40
freeing memory at 0x7f9f0c051f30
freeing memory at 0x7f9f0c068670
freeing memory at 0x7f9f0c066600
freeing memory at 0x7f9f0c068690
freeing memory at 0x7f9f0c004f20
freeing memory at 0x7f9f0c0685e0
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