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 0x7fffc4063c20
freeing memory at 0x7fffc4063a50
freeing memory at 0x7fffc4063a30
freeing memory at 0x7fffc4066cb0
freeing memory at 0x7fffc40691e0
freeing memory at 0x7fffc4067eb0
freeing memory at 0x7fffc406a290
freeing memory at 0x7fffc4063c50
freeing memory at 0x7fffc406a270
freeing memory at 0x7fffc405f450
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