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Question

scala> val env: Main.Environment = { case "x" => 5 case "y" => 7 }
env: Main.Environment = $Lambda$1511/1682100030@60f1f95b
scala> val exp: S = E(Var(x),Some(E2(E(Const(7),Some(E2(E(Var(y),None)))))))
exp: S = E(Var(x),Some(E2(E(Const(7),Some(E2(E(Var(y),None)))))))

scala> println(Main.eval(exp, env))

Answer 1

So what is your question/ problem?