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 0x7fb54404f4c0
freeing memory at 0x7fb544004b00
freeing memory at 0x7fb54404f860
freeing memory at 0x7fb54404f7a0freeing memory at 0x7fb54404e9a0
freeing memory at 0x7fb544048980
freeing memory at 0x7fb54404f810
freeing memory at 0x7fb54404f1a0
freeing memory at 0x7fb54404f830
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