File: t7872c.scala

package info (click to toggle)
scala 2.11.12-6
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid, trixie
  • size: 62,924 kB
  • sloc: javascript: 28,808; java: 13,415; xml: 3,135; sh: 1,620; python: 756; makefile: 38; awk: 36; ansic: 6
file content (8 lines) | stat: -rw-r--r-- 235 bytes parent folder | download | duplicates (4) 
1
2
3
4
5
6
7
8
 
object coinv {
  def up[F[+_]](fa: F[String]): F[Object] = fa
  def down[F[-_]](fa: F[Object]): F[String] = fa
 
  up(List("hi"))
  // [error] type A is covariant, but type _ is declared contravariant
  down(List('whatever: Object))
}