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 0x7ff95c063bc0
freeing memory at 0x7ff95c06a210
freeing memory at 0x7ff95c0639f0
freeing memory at 0x7ff95c06a230
freeing memory at 0x7ff95c063bf0
freeing memory at 0x7ff95c0639d0
freeing memory at 0x7ff95c066c50
freeing memory at 0x7ff95c069180
freeing memory at 0x7ff95c05f3f0
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