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import scala.language.experimental.macros
import scala.reflect.macros.BlackboxContext
// explain some macro types to me
object BadMac {
def printf(format: String, params: Any*): Unit = macro printf_impl
def printf_impl(c: BlackboxContext)(format: c.Expr[String], params: c.Expr[String]*): c.Expr[Unit] = ???
}
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