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import language.experimental.macros
import scala.reflect.macros.BlackboxMacro
trait Impls extends BlackboxMacro {
import c.universe._
def impl1(x: Expr[Int]) = q"println(x)"
def impl2(x: Tree) = q"println(x)"
def impl3(x: Block) = q"println(x)"
}
object Macros {
def m1(x: Int): Unit = macro Impls.impl1
def m2(x: Int): Unit = macro Impls.impl2
def m3(x: Int): Unit = macro Impls.impl3
}
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