Macros_2.scala:5: error: not found: value macro
    def foo(x: Int): Int = macro foo_impl
                           ^
Macros_2.scala:7: error: not found: value macro
  def bar(x: Int): Int = macro bar_impl
                         ^
Macros_2.scala:11: error: not found: value macro
  def quux(x: Int): Int = macro quux_impl
                          ^
three errors found