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 0x7fdbf004fbe0
freeing memory at 0x7fdbf004f5e0
freeing memory at 0x7fdbf00079d0
freeing memory at 0x7fdbf004fc50
freeing memory at 0x7fdbf004fc70
freeing memory at 0x7fdbf004f900
freeing memory at 0x7fdbf0048dc0
freeing memory at 0x7fdbf004fca0
freeing memory at 0x7fdbf004ede0
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