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 0x3ff2806a0d0
freeing memory at 0x3ff28066260
freeing memory at 0x3ff28066240
freeing memory at 0x3ff28063e90
freeing memory at 0x3ff28006fa0
freeing memory at 0x3ff28066960
freeing memory at 0x3ff28068720
freeing memory at 0x3ff280573b0
freeing memory at 0x3ff28068700
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