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 0x7f4db40573d0
freeing memory at 0x7f4db4066260
freeing memory at 0x7f4db4006fa0
freeing memory at 0x7f4db4063eb0
freeing memory at 0x7f4db4066980
freeing memory at 0x7f4db406a0f0
freeing memory at 0x7f4db4068720
freeing memory at 0x7f4db4068740
freeing memory at 0x7f4db4066280
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