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 0x7f850800de30
freeing memory at 0x7f8508066c90
freeing memory at 0x7f8508068720
freeing memory at 0x7f8508068dc0
freeing memory at 0x7f8508066410
freeing memory at 0x7f85080663f0
freeing memory at 0x7f85080663d0
freeing memory at 0x7f8508068740
freeing memory at 0x7f8508068e50
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