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 0x7f66380661d0
freeing memory at 0x7f6638068190
freeing memory at 0x7f6638067af0
freeing memory at 0x7f663805daf0
freeing memory at 0x7f6638051a50
freeing memory at 0x7f6638004b00
freeing memory at 0x7f6638068220
freeing memory at 0x7f6638068240
freeing memory at 0x7f66380661b0
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