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import scala.reflect.runtime.universe._
import scala.reflect.macros.{BlackboxContext => Ctx}
object Impls {
def foo[U: c.WeakTypeTag](c: Ctx)(x: c.Expr[U]) = {
import c.universe._
val U = implicitly[c.WeakTypeTag[U]]
val body = Apply(Select(Ident(definitions.PredefModule), TermName("println")), List(Literal(Constant(U.toString))))
c.Expr[Unit](body)
}
}
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