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import scala.reflect.macros.blackbox.Context
object Impls {
def foo[U](c: Context)(x: c.Expr[U])(evidence: c.Expr[Numeric[U]]) = {
import c.universe._
val plusOne = Apply(Select(evidence.tree, TermName("plus")), List(x.tree, Literal(Constant(1))))
val body = Apply(Select(Ident(definitions.PredefModule), TermName("println")), List(plusOne))
Expr[Unit](body)
}
}
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