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 0x7fa31404f4b0
freeing memory at 0x7fa314004b00
freeing memory at 0x7fa31404f850
freeing memory at 0x7fa31404f790
freeing memory at 0x7fa31404e990
freeing memory at 0x7fa314048970
freeing memory at 0x7fa31404f800
freeing memory at 0x7fa31404f190
freeing memory at 0x7fa31404f820
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