We don't need callback APIs if we have #2169.

we still would like to use some kind of callback like opeval.
Let's see.

If we remove the callbacks, we remove the possibility of doing lambda methods.

We have Pointer.

Go?

We need to remove this line first

https://github.com/neo-project/neo-vm/blob/defb2371d9a6a032bdea94e0c8b903a4729c9152/src/neo-vm/ExecutionEngine.cs#L298

But a I am worry about share pointers. How we will be isolated?

We need to remove this line first

Why should we remove this line? The Pointer should be used in the same contract only.

But then, how can we use a contract library with a method as an argument?

But then, how can we use a contract library with a method as an argument?

You can send the method name to it, just like what we did in Oracle contract.