Remove unused ad-hoc test files

regression/valid/NestedVar.scala

-object NestedVar {
-
-  def foo(): Int = {
-    val a = 3
-    def rec(x: Int): Int = {
-      var b = 3
-      var c = 3
-      if(x > 0)
-        b = 2
-      else
-        c = 2
-      c+b
-    }
-    rec(a)
-  } ensuring(_ == 5)
-
-}

regression/valid/Unit1.scala

-object Unit1 {
-
-  def foo(): Unit = ({
-    ()
-  }) ensuring(_ == ())
-
-}

regression/valid/Unit2.scala

-object Unit2 {
-
-  def foo(u: Unit): Unit = {
-    u
-  } ensuring(_ == ())
-
-}

regression/valid/While1.scala

-object While1 {
-
-  def foo(): Int = {
-    var a = 0
-    var i = 0
-    while(i < 10) {
-      a = a + 1
-      i = i + 1
-    }
-    a
-  } ensuring(_ == 10)
-
-}

regression/valid/While2.scala

-object While1 {
-
-  def foo(): Int = {
-    var a = 0
-    var i = 0
-    while(i < 10) {
-      a = a + i
-      i = i + 1
-    }
-    a
-  } ensuring(_ == 45)
-
-}

regression/valid/While3.scala

-object While3 {
-
-  def foo(): Int = {
-    var a = 0
-    var i = 0
-    while({i = i+2; i <= 10}) {
-      a = a + i
-      i = i - 1
-    }
-    a
-  } ensuring(_ == 54)
-
-}

run-tests.sh

-#!/bin/bash
-
-base=./regression
-nbtests=$(ls -l $base/{valid,invalid,error}/*.scala | wc -l)
-nbsuccess=0
-failedtests=""
-
-for f in $base/valid/*.scala; do
-  echo -n "Running $f, expecting VALID, got: "
-  res=`./leon --xlang --noLuckyTests --timeout=10 --oneline "$f"`
-  echo $res | tr [a-z] [A-Z]
-  if [ $res = valid ]; then
-    nbsuccess=$((nbsuccess + 1))
-  else
-    failedtests="$failedtests $f"
-  fi
-done
-
-for f in $base/invalid/*.scala; do
-  echo -n "Running $f, expecting INVALID, got: "
-  res=`./leon --xlang --noLuckyTests --timeout=10 --oneline "$f"`
-  echo $res | tr [a-z] [A-Z]
-  if [ $res = invalid ]; then
-    nbsuccess=$((nbsuccess + 1))
-  else
-    failedtests="$failedtests $f"
-  fi
-done
-
-for f in $base/error/*.scala; do
-  echo -n "Running $f, expecting ERROR, got: "
-  res=`./leon --xlang --noLuckyTests --timeout=10 --oneline "$f"`
-  echo $res | tr [a-z] [A-Z]
-  if [ $res = error ]; then
-    nbsuccess=$((nbsuccess + 1))
-  else
-    failedtests="$failedtests $f"
-  fi
-done
-
-echo "$nbsuccess out of $nbtests tests were successful"
-if [ $nbtests -eq $nbsuccess ]; then
-  echo "PASSED"
-else
-  echo "ERROR. The following test did not run as expected:"
-  for f in $failedtests; do echo $f; done
-fi