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 0x7fab90048a00
freeing memory at 0x7fab9004f850
freeing memory at 0x7fab90048a20
freeing memory at 0x7fab9004f5e0
freeing memory at 0x7fab9004fe50
freeing memory at 0x7fab9004f620
freeing memory at 0x7fab9004ff10
freeing memory at 0x7fab9004f5c0
freeing memory at 0x7fab9004f870
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