I can't get the user input in OCaml

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When I use built-in functions like read_int(), read_line(), they wait for input also if I just typed it e pressed ENTER.

This screenshot can probably explain better than me

And it waits until I put ;; but then it returns Exception: Failure "int_of_string"., cause, I think, it reads ;; as part of the input.

I saw in another question that i can type the input as usual but instead of pressing ENTER I should use M-x comint-send-input so tuareg won't check for ;;. But this way it's a bit tricky if you have to do the same thing everytime, so do you know how to solve the problem?

Thank you



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