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import scala.reflect.macros.blackbox.Context object Impls { def foo(c: Context)(x: c.Expr[Int]) = { import c.universe._ val body = Apply(Select(x.tree, TermName("$plus")), List(Literal(Constant(1)))) c.Expr[Int](body) } } object Macros { def foo(x: Int) = macro Impls.foo }