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 0xffff54066990
freeing memory at 0xffff54068750
freeing memory at 0xffff54063ec0
freeing memory at 0xffff54006fa0
freeing memory at 0xffff54066290
freeing memory at 0xffff54066270
freeing memory at 0xffff540573e0
freeing memory at 0xffff5406a100
freeing memory at 0xffff54068730
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