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 0x3ff2c068d80
freeing memory at 0x3ff2c066c50
freeing memory at 0x3ff2c0686e0
freeing memory at 0x3ff2c068700
freeing memory at 0x3ff2c068e10
freeing memory at 0x3ff2c0663b0
freeing memory at 0x3ff2c066390
freeing memory at 0x3ff2c00de30
freeing memory at 0x3ff2c0663d0
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