Make remote execution cell work regardless of Elixir and OTP versions

[jonatanklosko]

🐈‍⬛

[mrluc]

Haha, seems like an obvious way to fix this in retrospect! There's elixir on the other side, so do version-safe rpc of just Code.eval_string, on a string of user's code, instrumented.

...
    {nil, binding} =
      :erpc.call(node, Code, :eval_string, [   #<-- this line right here
        eval_string,
        [input: {string, binding, opts}],
        [file: @relative_file, line: line]
      ])

    {result, diagnostics} = binding[:output]

    for diagnostic <- diagnostics do
      Code.print_diagnostic(diagnostic)
    end

    case result do
      {:ok, value} ->
        value
...

DECE