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