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run-gadts-strict.scala:12: error: type mismatch;
found : n.type (with underlying type Int)
required: T
case Lit(n) => n
^
run-gadts-strict.scala:13: error: type mismatch;
found : Int
required: T
case Succ(u) => eval(u) + 1
^
run-gadts-strict.scala:14: error: type mismatch;
found : Boolean
required: T
case IsZero(u) => eval(u) == 0
^
run-gadts-strict.scala:15: error: type mismatch;
found : T(in class If)
required: T(in method eval)
case If(c, u1, u2) => eval(if (eval(c)) u1 else u2)
^
four errors found
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