nowarn

class nowarn(value: String) extends ConstantAnnotation

An annotation for local warning suppression.

The optional value parameter allows selectively silencing messages, see scalac -Wconf:help for help. Examples:

def f = {
  1: @nowarn // don't warn "a pure expression does nothing in statement position"
  2
}

@nowarn def f = { 1; deprecated() } // don't warn

@nowarn("msg=pure expression does nothing")
def f = { 1; deprecated() } // show deprecation warning

To ensure that a @nowarn annotation actually suppresses a warning, enable -Xlint:unused or -Wunused:nowarn. The unused annotation warning is emitted in category unused-nowarn and can be selectively managed using -Wconf:cat=unused-nowarn:s.

Source
nowarn.scala
class Object
trait Matchable
class Any