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 0xffff5c068730
freeing memory at 0xffff5c068750
freeing memory at 0xffff5c063ec0
freeing memory at 0xffff5c006fa0
freeing memory at 0xffff5c066290
freeing memory at 0xffff5c066270
freeing memory at 0xffff5c0573e0
freeing memory at 0xffff5c066990
freeing memory at 0xffff5c06a100
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