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 0x3fe7c04fef0
freeing memory at 0x3fe7c04f850
freeing memory at 0x3fe7c04f830
freeing memory at 0x3fe7c04f5a0
freeing memory at 0x3fe7c04f5c0
freeing memory at 0x3fe7c04fe30
freeing memory at 0x3fe7c04f600
freeing memory at 0x3fe7c0489e0
freeing memory at 0x3fe7c048a00
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