t5856.scala:10: error: invalid string interpolation: `$$', `$'ident or `$'BlockExpr expected
  val s9 = s"$"
             ^
t5856.scala:10: error: unclosed string literal
  val s9 = s"$"
              ^
t5856.scala:2: error: error in interpolated string: identifier or block expected
  val s1 = s"$null"
              ^
t5856.scala:3: error: error in interpolated string: identifier or block expected
  val s2 = s"$false"
              ^
t5856.scala:4: error: error in interpolated string: identifier or block expected
  val s3 = s"$true"
              ^
t5856.scala:5: error: error in interpolated string: identifier or block expected
  val s4 = s"$yield"
              ^
t5856.scala:6: error: error in interpolated string: identifier or block expected
  val s5 = s"$return"
              ^
t5856.scala:7: error: error in interpolated string: identifier or block expected
  val s6 = s"$new"
              ^
t5856.scala:8: error: error in interpolated string: identifier or block expected
  val s7 = s"$s1 $null $super"
                  ^
t5856.scala:9: error: error in interpolated string: identifier or block expected
  val s8 = s"$super"
              ^
10 errors found