Remove filtering in ChooseEncoder

Author: jad-hamza

src/main/scala/inox/solvers/unrolling/ChooseEncoder.scala

@@ -25,13 +25,9 @@ trait ChooseEncoder extends transformers.ProgramTransformer {
 
     val newFds = sourceProgram.symbols.functions.values.toList.map { fd =>
       def rec(e: Expr, params: Seq[ValDef]): Expr = e match {
-        case l: Let =>
-          val free = exprOps.variablesOf(l)
-          l.copy(body = rec(l.body, params.filter(vd => free(vd.toVariable)) :+ l.vd)).copiedFrom(l)
+        case l: Let => l.copy(body = rec(l.body, params :+ l.vd)).copiedFrom(l)
 
-        case l: Lambda =>
-          val free = exprOps.variablesOf(l)
-          l.copy(body = rec(l.body, params.filter(vd => free(vd.toVariable)) ++ l.params)).copiedFrom(l)
+        case l: Lambda => l.copy(body = rec(l.body, params ++ l.params)).copiedFrom(l)
 
         case c: Choose =>
           val (substMap, freshParams) = params.foldLeft((Map[ValDef, Expr](), Seq[ValDef]())) {