gistfile1.txt

import scala.language.experimental.macros
import scala.reflect.macros.Context
import scala.annotation.StaticAnnotation

class csvTyped(val sample: String)(funcs: (String => Any)*) extends StaticAnnotation {
  def macroTransform(annottees: Any*): Any = macro Macros.impl
}

object Macros {
  def impl(c: Context)(annottees: c.Expr[Any]*): c.Expr[Any] = {
    import c.universe._
    val Apply(Select(Apply(Apply(_, List(Literal(Constant(macroArgument: String)))), functions), _), _) = c.macroApplication
    val types = functions.map(func => c.typeCheck(func, typeOf[String => Any], silent = false, withImplicitViewsDisabled = false, withMacrosDisabled = false).tpe).map {
      case TypeRef(_, fn1, _ :: returnType :: Nil) if fn1 == typeOf[Function1[_, _]].typeSymbol => returnType
    }
    ???
  }
}

=======

@csvTyped("sample.csv")(_.toDouble)
object Test