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import scala.reflect.macros.blackbox.Context
object Impls {
def foo(c: Context)(x: c.Expr[Int])(y: c.Expr[Int]) = {
import c.universe._
val sum = Apply(Select(x.tree, TermName("$minus")), List(y.tree))
val body = Apply(Select(Ident(definitions.PredefModule), TermName("println")), List(sum))
c.Expr[Unit](body)
}
}
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