Consider the AST Nodes for this lab, the declared type of the eval function in L

Question

Consider the AST Nodes for this lab, the declared type of the eval function in Lab2.scala, and a new function we declare here: def eval(env: Env, e: Expr): Expr def newFunc): Double // Takes no arguments, returns a Double Keeping in mind these declarations, which of the following Scala expressions are valid (well typed)? You may select more than 1. Select one or more: a. newFunc) newFunc) b. eval(empty, N(1)) eval(empty, N(2)!) C. eval(empty, N(newFunc())) Binary(Plus, eval(empty, N(1)), N(3)) e. Binary(Plus, newFunc(), N(3))

Explanation / Answer

[a] Correct
Res : Add Two Double value

[b] Correct
Res : Proper Format

[c] InCorrect
Res : N(Return Double value)

[d] Correct
Res: Sum of 2 Exp

[e] InCorrect
Res : Double + Exp can't add

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