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 0xffff84068dd0
freeing memory at 0xffff84066ca0
freeing memory at 0xffff84068750
freeing memory at 0xffff84068e60
freeing memory at 0xffff840663e0
freeing memory at 0xffff84066400
freeing memory at 0xffff84066420
freeing memory at 0xffff8400de30
freeing memory at 0xffff84068730
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