How to convert a generic method into generic function

Question

How to convert the method timed into a function?

val timing = new StringBuffer
def timed[T](label: String, code: => T): T = {
  val start = System.currentTimeMillis()
  val result = code
  val stop = System.currentTimeMillis()
  timing.append(s"Processing $label took ${stop - start} ms.\n")
  result
}

Below causes "error: not found: type T"

val timing = new StringBuffer
val timed: (String, => T) => T = (label, code) => {
    val start = System.currentTimeMillis()
    val result = code
    val stop = System.currentTimeMillis()
    timing.append(s"Processing $label took ${stop - start} ms.\n")
    result
}

Solution

There is no such thing as generic function in Scala (and generic value at all), only generic methods are.

Generic functions will appear in Scala 3.

https://github.com/lampepfl/dotty/pull/4672

http://dotty.epfl.ch/docs/reference/overview.html#new-constructs

val timing = new StringBuffer
val timed: [T] => (String, /*=>*/ T) => T = [T] => (label: String, code: /*=>*/ T) => {
  val start = System.currentTimeMillis()
  val result = code
  val stop = System.currentTimeMillis()
  timing.append(s"Processing $label took ${stop - start} ms.\n")
  result
}

in Dotty 0.20.0-RC1.