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 0x7ffcf004efe0
freeing memory at 0x7ffcf004f5f0
freeing memory at 0x7ffcf004f8c0
freeing memory at 0x7ffcf004f8a0
freeing memory at 0x7ffcf004ff60
freeing memory at 0x7ffcf004fea0
freeing memory at 0x7ffcf004f080
freeing memory at 0x7ffcf004f670
freeing memory at 0x7ffcf0050070
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