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 0x3ff4804f5a0
freeing memory at 0x3ff4804f600
freeing memory at 0x3ff48048a00
freeing memory at 0x3ff4804f5c0
freeing memory at 0x3ff4804fef0
freeing memory at 0x3ff4804fe30
freeing memory at 0x3ff4804f850
freeing memory at 0x3ff480489e0
freeing memory at 0x3ff4804f830
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