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 0x3ff700663b0
freeing memory at 0x3ff70068d80
freeing memory at 0x3ff70066c50
freeing memory at 0x3ff700686e0
freeing memory at 0x3ff70068700
freeing memory at 0x3ff70068e10
freeing memory at 0x3ff7000de30
freeing memory at 0x3ff700663d0
freeing memory at 0x3ff70066390
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